Class 7 NSO 5 Years EBook

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(2) Copyright © 2015 Science Olympiad Foundation. Printed with the permission of Science Olympiad Foundation. No part. of this publication may be reproduced, transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the copyright holder. Ownership of an ebook does not give the possessor the ebook copyright. All disputes subject to Delhi jurisdiction only.. Disclaimer : The information in this book is to give you the path to success but it does not guarantee 100% success as the strategy is completely dependent on its execution. And it is based on last years papers of NSO exam.. Published by : MTG Learning Media (P) Ltd. Corporate Office : Plot 99, 2nd Floor, Sector 44 Institutional Area, Gurgaon, Haryana. Phone : 0124 - 4951200 Web: mtg.in Email: [email protected] Regd. Office : 406, Taj Apt., Ring Road, Near Safdarjung Hospital, New Delhi-110029. Visit. www.mtg.in for buying books online..

(3) CLASS 7. Contents ªª 13th NSO 2010 ªª 14th NSO 2011 ªª 15th NSO 2012 - SET A ªª 15th NSO 2012 - SET B ªª 16th NSO 2013 - SET A ªª 16th NSO 2013 - SET B ªª 17th NSO 2014 - SET A ªª 17th NSO 2014 - SET B.

(4) MTG Work-Books / olympiad books CLASS 1. International Mathematics Olympiad. National Science Olympiad. International English Olympiad. MTG CSS Series. CLASS 2. International Mathematics Olympiad. National Science Olympiad. National Cyber Olympiad. International English Olympiad. MTG CSS Series. International English Olympiad. MTG CSS Series. CLASS 3. International Mathematics Olympiad. National Science Olympiad. National Cyber Olympiad.

(5) MTG Work-Books / olympiad books CLASS 4. International Mathematics Olympiad. National Science Olympiad. National Cyber Olympiad. International English Olympiad. MTG CSS Series. International English Olympiad. MTG CSS Series. International English Olympiad. MTG CSS Series. CLASS 5. International Mathematics Olympiad. National Science Olympiad. National Cyber Olympiad. CLASS 6. International Mathematics Olympiad. National Science Olympiad. National Cyber Olympiad.

(6) MTG Work-Books / olympiad books CLASS 7. National Science Olympiad. International Mathematics Olympiad. National Cyber Olympiad. Science IQ Challenge. Math IQ Challenge. International English Olympiad. MTG CSS Series. Master Mental Ability in 30 Days. CLASS 8. International Mathematics Olympiad. National Science Olympiad. National Cyber Olympiad. International English Olympiad. MTG CSS Series. Math IQ Challenge. Science IQ Challenge. Psychology of Success. The Secrets of SUCCESS. Master Mental Ability in 30 Days.

(7) MTG Work-Books / olympiad books CLASS 9. International Mathematics Olympiad. Math IQ Challenge. National Science Olympiad. Science IQ Challenge. National Cyber Olympiad. Psychology of Success. The Secrets of SUCCESS. International English Olympiad. Master Mental Ability in 30 Days. CLASS 10. International Mathematics Olympiad. Math IQ Challenge. National Science Olympiad. Science IQ Challenge. National Cyber Olympiad. Psychology of Success. The Secrets of SUCCESS. International English Olympiad. Master Mental Ability in 30 Days.

(8) MTG Work-Books / olympiad books CLASS 11. International Mathematics Olympiad. Math IQ Challenge. Science IQ Challenge. National Science Olympiad. Psychology of Success. National Cyber Olympiad. The Secrets of SUCCESS. Master Mental Ability in 30 Days. CLASS 12. International Mathematics Olympiad. Math IQ Challenge. Science IQ Challenge. National Science Olympiad. Psychology of Success. National Cyber Olympiad. The Secrets of SUCCESS. Master Mental Ability in 30 Days.

(9) Class. 1 to 10.

(10) JEE (Main & Advanced) | AIPMT | BOARDS | OLYMPIAD | NTSE. FOUNDATION COURSE For Classes 7, 8, 9 & 10 Class 7. Class 8. Class 9. Class 10.

(11) Class 7 13th. Year 2010. Copyright©2015. Science Olympiad Foundation (SOF).

(12) CLASS 7 | 13th NSO - 2010. MENTAL ABILITY 1. . Arvind owns a computerrepair shop. On Monday he repaired 2 computers. . • He charged ` 15 service fee for each computer he repaired. • He worked a total of 4.5 hours to repair both computers. • He charged ` 35 per hour. Which of the following expressions can be used to find the total amount Arvind charged to repair the 2 computers? (A) 2(15) + 4.5(35) 2. . 3. . (D) 15(35) + 4.5(2) . June May April March February January 100 . 200 300 400 500 Number of story books sold . 600 . The ratio of boys to the total number of students in Ms. Ankita's class is 4 to 9. The class has a total of 27 students. How many girls are in the class? (B) 50 . (C) 15 . (D) 12 . Which shows 833,000 written in scientific notation? (A) 8.33 ´ 10 3 . 5. . (C) 4.5(50) . The given graph shows the sale of story books in a bookshop for the first 6 months. In which month was the sale of story books 75% of the sale of books in June ? (A) February (B) March (C) April (D) May . (A) 23 4. . (B) 2(35) + 4(15) . (B) 8.33 ´ 10 4 . (C) 8.33 ´ 10 5 . (D) 8.33 ´ 10 6 . Samrat made a snack mix using ingredients listed below. 1 3 1 1 1 cups almonds, cup peanuts, cup raisins, cup chocolate chips s 4 4 2 4 What is the total amount of all four ingredients? 3 s (A) 1 cups 4 . 6. . 1 (B) 2 cups s 4 . 1 (C) 2 cups s 8 . 3 (D) 2 cups s 4 A . In the given figure, AB and CD are straight lines. Find Ðy. (A) 97° (B) 87° (C) 77° . C . (D) 55° 7. . A . The given figure is made up of two equal triangles. Find the area of shaded part. (A) 45 cm 2 . (B) 13.5 cm 2 . 2 . 2 . 6. (D) 12.8 cm . B . 9 cm . C . Find the value of 4 + 12 ÷ 4 × 2 + 10. (A) 18 . 9. . 35° B . (C) 27 cm 8. . D . 48° y . (B) 20 . (C) 12 . (D) 26 . Rahul has x baseball cards. Mayank has 3 times as many baseball cards as Rahul. Raj has 20 baseball cards. Which of the following expressions represents the total number of baseball cards with Rahul, Mayank and Raj all together ? (A) x + 3x + 20 . 13 th NSO | LevelI | Class 7 . (B) 20 + 3x – x . (C) x + 3 + 20 2 . Copyright©2015. Science Olympiad Foundation (SOF). (D) 20 – 3x + x.

(13) CLASS 7 | 13th NSO - 2010. 10. Which of the following statements best describes the water level of the pool from 2 p.m. to 3 p.m.? (A) The pool is empty. (B) The water level is constant. (C) The water level is increasing. (D) The water level is decreasing. . Water level . Wading Pool . 11 a.m.12 p.m. 1 p.m. 2 p.m. 3 p.m. 4 p.m. . Time . 11. Number of cubes required to make the given figure is (A) 15 . (B) 16 . (C) 19 . (D) 20 . 12. Lines w and x intersect lines y and z to form a rectangle as shown. Which of the following statements is true? (A) Line x is parallel to line y. (B) Line x is parallel to line z. (C) Line w is perpendicular to line y. . w x y . z . (D) Line w is perpendicular to line x. . 13. Which of the following shows a symmetric figure? (A) . (B) . 14. The given table shows the pattern between the number of toothpicks used. Which of the following expressions can Radhika u s e to d e te rmi n e th e n u mb e r o f toothpicks used to make n squares? (A) 4n . (C) . (D) . No. of squares . 1 . 2 . 3 . 4 . n . No. of toothpicks . 4 . 7 . 10 . 13 . ? . Picture . (B) 4n – 1 . (C) 3n + 1 . (D) 3n – 1 . 15. What threedimensional shape could be formed by folding this figure on the dashed line segments? (A) Rectangular prism . (B) Square pyramid . (C) Triangular prism . (D) Triangular pyramid . 4 cm 4 cm . 16. The graph given here shows the motion of four runners P, Q, R and S in a 5 km marathon. Whose motion is the fastest ? (A) P (B) Q (C) R (D) S . Distance (km) . SCIENCE 6 5 4 3 2 1 . P . Q R S . 1 2 3 4 5 6 Time (h) . 17. When the switch of an electric bell is pushed (A) Flow of current stops through the electromagnet in the bell (B) A current starts to flow through the electromagnet (C) Electromagnet becomes inactive (D) None of these 18. What do we call hand spindle in Hindi? (A) Takli . (B) Charkha . (C) Lint 3 . Copyright©2015. Science Olympiad Foundation (SOF). (D) Knit 13 th NSO | LevelI | Class 7 .

(14) CLASS 7 | 13th NSO - 2010. 50. . 10 0 . 50. . 50. . 60. . 60. . 60. . 70. . 70. . 70. . 80 . 80. . 80. . 90 . 90 . 90. . 10. 10. 0 . 0 . 110. 11. . 0 . 110. . 19. Rohan wants to test whether a white object or a black object would heat up faster in the Sun. The picture shows you his experiment which uses three thermometers 1, 2 and 3. These thermometers were left out in the Sun for 30 minutes. . 20 . 0 . (B) Thermometer 2 shows a higher temperature than thermometer 3. . 1 . . Black object 2 . 10. White . 0 . 0 . 10. . 10. . 20. . (A) Thermometer 1 reads the same as thermometer 3. . 20. . 30. . 30. . 30. . 40. . 40 . 40. . Which of the following statements is true ? . object . 3 . (C) Thermometer 3 shows higher temperature than thermometer 1. (D) Thermometer 1 reads the same as thermometer 2. . Time . Time . (D) . Distance . (C) . Distance . (B) . Distance . (A) . Distance . 20. Which of the following graphs does NOT represent constant speed? . Time . Time . 21. The bulb in the circuit given here does not glow. Which labelled part is responsible for this? 1 . (A) 1 . 2 . (B) 2 4 . (C) 3 . – . (D) 4 . + . + 3 . – . 22. The given figure shows four cells fixed on a board. The correct connection of their terminals to make a battery of four cells is ______ . (A) . (B) . (C) . (D) . 23. Match column I and column II and select the correct options from the codes given below. Column I Column II (a) Lateral inversion (i) An image which cannot be caught on a screen (b) Luminous (ii) Objects that allow some light to pass through (c) Translucent (iii) Object producing light by itself (d) Virtual (iv) Turned around from left to right (A) a(i), b(ii), c(iii), d(iv) . (B) a(iv), b(iii), c(ii), d(i) . (C) a(iii), b(i), c(iv), d(ii) . (D) a(ii), b(iv), c(i), d(iii) . 24. The factor which contribute(s) to the development of cyclones is/are ______ (i) Wind speed (ii) Temperature (iii) Humidity (A) (i) only . (B) (ii) & (iii) only . (C) (i) & (iii) only . (D) All of these . 25. In the diagram shown below, paper clips are attracted to the two poles of a bar magnet. The polarity of ends X and Y are ______ (A) Npole and Spole . (B) Npole and Npole . (C) Spole and Spole . (D) Spole and Npole. 13 th NSO | LevelI | Class 7 . 4 . Copyright©2015. Science Olympiad Foundation (SOF). N . S . P . Q . X . Y .

(15) CLASS 7 | 13th NSO - 2010. 26. Miss Megha is 20 cm away from the plane mirror. If she moves few steps closer to the mirror, what will happen to the image size in the mirror ? . 20 cm . (A) The size of image will decrease. . (B) The size of image will increase. . (C) The size of image will be same. . (D) Cannot say. . 27. Reena prepared several Venn diagrams to find relations between different types of changes. Which Venn diagram made by Reena is correct ? . (A) . Physical Chemical changes changes . (B) . Physical changes . Chemical changes . (C) . Physical changes . Irreversible changes (D) . 28. Observe the given flow chart carefully and mark the option that best represents I, II, III and IV. I (A) Mineral . II Base . III Salt . IV Acetic acid . (B) Mineral . Salt . Base . Acetic acid . (C) Salt . Base . Acetic acid . Mineral . (D) Base . Salt . Mineral . Acetic acid . Chemical changes . Irreversible changes . Compounds Acid e.g., H 2SO4 , HCl . I e.g., Mg(OH) 2 . II e.g., NaCl . Organic e.g., IV . III e.g., H3PO 4 . 29. Rajesh performed two different sets of experiments. (i) He burnt a piece of magnesium which gives off bright flames. (ii) He heated a piece of iron which glows red. Which of the conclusions made by Rajesh about his experiments is true ? (A) (i) is a chemical change. . (B) (ii) is a chemical change. . (C) (i) is a physical change. . (D) (ii) is an irreversible change. . 30. Statement I : We should plant eucalyptus trees along all sewage ponds. Statement II : Eucalyptus trees absorb all surplus waste water rapidly and release pure water vapour into the atmosphere. (A) Both statements I and II are true and statement II is the correct explanation of statement I. (B) Both statements I and  II are true but statement II is not the correct explanation of statement I. (C) Statement I is true but statement II is false. . (D) Both statements I and II are false. . 31. A teacher demonstrated an experiment to the students to show the separation of substances by separating the constituents of saline water. What do you think her procedure must have been so as to obtain both the constituents ? (A) She filtered the solution to obtain salt and water (B) She first filtered the solution and then decanted it (C) She decanted the solution to obtain salt and water (D) She first evaporated the water and then condensed the vapours 32. A group of students of class 7th were performing an experiment . Among them a student poured alcohol on a plant continuously for a long time. The plant could not prepare food on its own any more. Which of the following statements explains the reason behind it ? (A) (B) (C) (D) . Alcohol absorbed all the food prepared by the plant. Alcohol does not let the plant absorb carbon dioxide from the air. Alcohol dissolved all the minerals present in the plant. Alcohol dissolved the chlorophyll present in the plant.. 5 . Copyright©2015. Science Olympiad Foundation (SOF). 13 th NSO | LevelI | Class 7 .

(16) CLASS 7 | 13th NSO - 2010. 33. Ravi was given four liquids, 1, 2, 3 and 4. He took each liquid at a time and poured some of it in four beakers filled with water. He observed the following ______ Liquid 1 + water gives immiscible liquid, Liquid 2 + water gives miscible liquid Liquid 3 + water gives immiscible liquid, Liquid 4 + water gives miscible liquid What could liquids 1, 2, 3, and 4, respectively be? 1 . 2 . 3 . 4 . (A) Ink . juice . milk . kerosene . (B) Kerosene . milk . ink . mustard oil . (C) Mustard oil . milk . kerosene . ink . (D) Milk . ink . juice . kerosene . 34. Sita and Gita are two sisters staying in different cities. Both were gifted an iron statue by their brother. Sita has to take a lot of care to maintain the shine of the statue, however Gita does not need to make such efforts. This is because ______ I. Sita stays in Bombay II. Gita  stays in Bombay III. The humid weather of Bombay makes the statue prone to rusting IV. Gita stays in Jaipur. Which of the above reasons is/are correct ? (A) I, II and III . (B) I, III and IV . (C) II and III only . (D) II and IV only . 35. Reema classified the objects into two groups. Which of the classifications made by her is incorrect ? Things made of paper . Things made of glass . (A) . (B) . (C) . (D) . 36. The plants living in deserts need to reduce the loss of water because water is very scarce in deserts. Which of the following is an adaptation developed by the desert plants to manage the above situation ? (A) They have lots of branches and leaves. . (B) They do not shed leaves in the summer. . (C) They develop roots which come above the ground. (D) Their leaves are modified into spines. 37. The children employed in the silk industry face certain problems that include respiratory disorders, hearing problems, blisters and open wounds, etc. What do you think is the main cause of their respiratory problems? (A) Cramped, damp, dark and poorly ventilated work space. (B) Loud, deafening music playing in the background. (C) Inhalation of vapours from the boiling cocoons and the diesel used to run machines. (D) Checking of the hot water to see whether the silk threads have loosened enough to be removed from the cocoons. 13 th NSO | LevelI | Class 7 . 6 . Copyright©2015. Science Olympiad Foundation (SOF).

(17) CLASS 7 | 13th NSO - 2010. 38. In a normal adult heart beats about 70 to 72 times  a minute. In a child the heart beats up to X times a minute. What will come at the place of X ? (A) 120 . (B) 65 . (C) 80 . (D) 75 . Direction : Study the figures shown and answer Q. nos. 39 & 40. . b . a . c . d . 39. Which beak belongs to a bird that does not feed on animals? (A) (a) only . (B) (b) & (d) . (C) (a) & (c) . (D) (c) only . 40. The bird with beak as shown in figure c feeds on (A) Fish . (B) Fruits . (C) Nectar . (D) Insects . 41. Match column I with column II and select the correct option from the codes given below : Column I Column II (a) Red eyed frog (i) Long and strong claws (b) New world monkey (ii) Migrate to warmer regions (c) Polar bear (iii) Sticky pads on its feet (d) Siberian cranes (iv) Long tail (A) a(i), b(ii), c(iii), d(iv) . (B) a(iii), b(iv), c(i), d(ii) . (C) a(iv), b(iii), c(ii), d(i) . (D) a(ii), b(iii), c(i), d(iv) . 42. Study the figures given below. Which of the following is/are protective food(s)? (A) a (B) b (C) c (D) All of these. . a . c . b . 43. • Cool to wear • Absorbs water easily • Soft to touch • Creases easily • Can be washed and ironed easily The above properties describe which of the following fabrics ? (A) Cotton . (B) Silk . (C) Wool . (D) Nylon . 44. Which of the following statements are incorrect? (i) Diurnal animals are active during the day. (ii) Soil is the topmost layer of the Earth crust. (iii) Humus is the top soil containing small rocks. (iv) Alluvial and loamy soil are not suitable for growing crops. (A) (i) & (ii) . (B) (ii) & (iii) . (C) (iii) & (iv) . (D) (i) & (iv) . 45. Which figure shows the correct flow of blood in and out of the heart? From body . To body . To lungs . To lungs From lungs . To body . From lungs . (A) . (B) To body . To body . From Body To lungs . (C) . To lungs. (D) From lungs . From body . From lungs . 7 . Copyright©2015. Science Olympiad Foundation (SOF). From body . 13 th NSO | LevelI | Class 7 .

(18) CLASS 7 | 13th NSO - 2010. 46. In mammals the diaphragm is a muscular membrane that divides the thorax from abdomen. It plays an essential role in breathing. Which of the following labelled parts represents diaphragm in the given figure? (A) P . (B) Q . (C) R . (D) S . P Q R S . 47. Match column I with column II and select the correct option from the codes given below. Column I Column II (a) Ovary (i) Lowermost swollen part of pistil (b) Filament (ii) Slender stalk of the stamen (c) Style (iii) Numerous small bead like structures (d) Ovule (iv) Knoblike structure on the top of stamen (e) Anther (v) Elongated tube connecting ovary and stigma (A) a(i), b(ii), c(iii), d(iv), e(v) (C) a(iv), b(v), c(ii), d(iii), e(i) . (B) a(i), b(ii), c(v), d(iii), e(iv) (D) a(iii), b(v), c(ii), d(i), e(iv) . 48. Rohan was conducting an experiment regarding food and water movement in the plants. He removed the phloem tissue as shown in the figure. He observed the stem after few days. The stem showed swelling in the upper portion. What can be the reason behind swelling ? . Stem with phloem removed . Swollen tissue . (A) Upward movement of food getting blocked. . (B) Downward movement of food getting blocked. . (C) Upward movement of water getting blocked. . (D) Downward movement of water getting blocked. . 49. Bactrian camels found in the Gobi desert of Mongolia have thick fur as compared to the camels found in the Thar desert of Rajasthan. Identify the reason for this from the following given options. (A) Bactrian camels drink more water than camels of Thar desert. (B) Bactrian camels have developed thick fur to protect themselves from low temperature. (C) Bactrian camels have developed thick fur to protect themselves from high temperature. (D) Bactrian camels have thick fat in their hump. 50. Why do you think seeds and fruits need to be dispersed away from the mother plant ? (A) They may fall within the shade of the mother plant and not get enough sunlight. (B) They may not get enough food and moisture from the soil near the mother plant. (C) There may be too many seeds in a small area near the mother plant. (D) Any of these things may happen and prevent the growth of new healthy plant. SPACE FOR ROUGH WORK. 13 th NSO | LevelI | Class 7 . 8 . Copyright©2015. Science Olympiad Foundation (SOF).

(19) Class 7 14th. Year 2011. Copyright©2015. Science Olympiad Foundation (SOF).

(20) 2. CLASS 7 | 14th NSO - 2011. MENTAL ABILITY 1.. Sarah dropped a small ball from a ledge and recorded the height the ball reached after each bounce. Initial Height. 1st Bounce. 2nd Bounce. 3rd Bounce. 320 cm. 80 cm. 20 cm. 5 cm. Which rule best describes how high the ball reached after each bounce?. (A) The ball reached. 1 of its previous height. 2. (C) The ball reached. 1 of its previous height. 4. 2.. Mohit's fish-tank hose has a tear that is slowly growing longer. On Monday the tear was 1 mm 1 1 long, on Tuesday it was 1 mm long, on Wednesday it was 1 mm long, and on Thursday it was 2 4 3 1 mm long. If this pattern continues, on which day will the tear be exactly 2 1 mm long? 4 2 (A) Friday (B) Saturday (C) Sunday (D) Monday. 3.. Amit, Suchera and Neeti start running around a circular track and complete one round in 18, 24. 1 of its previous height. 3 1 (D) The ball reached of its previous height. 5 (B) The ball reached. and 32 seconds respectively. In how many least seconds will the three meet again at the starting. point if they all have started running at the same time ? (A) 196 (B) 288 (C) 324. 4.. Tara was standing in front of her house when she noticed the shape of the attic window. The. window had exactly one set of parallel sides. Which polygon is the window shaped like? (A) Square (B) Rhombus (C) Rectangle (D) Trapezium. 5.. Which picture shows a reflection over the dotted line?. (A). 6.. Nancy wants to draw a flower with rotational symmetry. Which flower should Nancy draw?. (A). 7.. (B). (B). (D) None of these. (C). (D). (C). (D). What approximate value should come in the place of (?) ?. 11.003 × 19.998 × 9.010 = ? (B) 1680 (C) 1800. (A) 1710. 8.. What is the ratio of Annie's pennies to Jack's pennies ?. (A) 3 : 1 . (B) 4 : 1. (C) 6 : 1. (D) 8 : 1 Copyright©2015. Science Olympiad Foundation (SOF). (D) 1980.

(21) 3 9.. What approximate value will come in place of question mark (?). CLASS 7 | 14th NSO - 2011. 1599 × 199 ÷ 49 – 1398 + 3877 = ? (A) 9400. (B) 9000. (C) 8700. (D) 8400. 10. Ridhima plans to go to the mall to buy earrings, which cost ` 7 a pair. She has ` 25 but wants to save ` 4 for lunch. Ridhima needs to determine how many pairs of earrings (x), she can buy, so she uses the equation 7x + 4 = 25. How many pairs of earrings can Ridhima buy?. (A) 2 pairs. (B) 3 pairs. (C) 4 pairs. (D) 5 pairs. 11. The total area of a circle and a square is equal to 5450 sq. cm. The diameter of the circle is 70 cms. What is the sum of the circumference of the circle and the perimeter of the square ?. (A) 360 cms. (B) 380 cms. (C) 270 cms. (D) None of these. 12. In a row of forty boys facing North, R is twelfth from the left end and T is eighteenth from the right end. How many boys are between R and T in the row ?. (A) 10. (B) 11. (C) 12. (D) None of these. 13. Pia has a triangular table next to her bed. The tabletop is a right triangle with one acute angle measuring 45°. What is the measure of the other acute angle?. (A) 45°. (B) 60°. (C) 75°. (D) 90°. 14. Which of the following conditions is INCORRECT about two adjacent angles ?. (A) Have a common vertex . (B) Have a common arm. (C) Have a common interior . (D) None of these. 15. What will come in place of question mark (?) in the following number series ?. 13, 16, 22, 33, 51, __ ?_ (A) 89. (B) 78. (C) 102. (D) 69. SCIENCE 16. Three identical containers X, Y and Z were filled with the same amount of tap water, boiling water and ice respectively and left in a room. Which one of the following graphs correctly shows the change in the temperature of the content in each container after some time ?. (A). Temperature (°C). Temperature (°C). Z. Y. X. Y. (B). X. Time (min). Z. Temperature (°C). Temperature (°C). Time (min). X. (C). Z Y. (D). Time (min). X Y Z Time (min). 17. Radha set up a circuit as shown.. At the end of the experiment, she concluded that liquid Z is a conductor of electricity. Which of the following led her to such a conclusion?. (i) The nichrome wire turns red hot.. (ii) The bulb lights up. . (A) (i) only. (B) (ii) only. Liquid Z. (C) (i) and (ii). Copyright©2015. Science Olympiad Foundation (SOF). Nichrome wire. (D) None of these..

(22) 4. CLASS 7 | 14th NSO - 2011 Speed (m s–1). 18. The graph shows how the speed of a car changes with time. How far does the car travel before the brakes are. 20. applied ? (A) 200 m (B) 250 m (C) 300 m (D) 350 m. 10. 5 10 15 20 25 30 Time (s). Direction (Q.No. 19 & 20) : Read the passage carefully and answer the . given questions.. Aman sets up the experiment as shown. The positions of the torch and object are fixed. 19. When Aman switches the torch on, which one of the following shows the correct shadow formed on the screen?. (A). (B). (C). (D). 20. To cast a bigger shadow on the screen, Aman should move _____.. (A) The object closer to the torch. (C) The object away from the torch.. (B) The screen closer to the object. (D) The torch away from the object.. 21. Match the columns and select the correct option from the codes given below. . Column I . Column II. Wind carrying water . Dark funnel shaped cloud Moving air Develop in India very frequently a-(iii), b-(ii), c-(iv), d-(i) a-(iv), b-(i), c-(iii), d-(i) . Thunderstorms Tornado Monsoon Wind a-(ii), b-(iv), c-(i), d-(iii) a-(i), b-(ii), c-(iii), d-(iv). (a) (b) (c) (d) (A) (C). (i) (ii) (iii) (iv) (B) (D). 22. The image formed by a slide projector on the screen is _____.. (A) Real, inverted and diminished. (B) Virtual, upright and diminished.. (C) Virtual, upright and magnified. (D) Real, inverted and magnified. 23. The magnet floating on the surface of water came to rest in the position shown in the figure.. The magnet is pointing in the ______ direction. (A) North-south (B) North-west. (C) South-east. (D) East-west.. 24. An ice cube was left on the table as shown in the diagram.. After a while, the ice cube started to melt. What inference can we make about the observation?. 1. 2. 3. 4. (A). The ice cube had gained heat. The ice cube had lost heat. The temperature of the ice had increased. The temperature of the ice had decreased. 1 only (B) 1 and 3 only (C) 2 and 3 only. (D) 2 and 4 only.. 25. A current carrying coil of an insulated wire wrapped around a piece of iron is called ____.. (A) An electric cell (B) An electromagnet (C) An electric wire (D) None of these. Copyright©2015. Science Olympiad Foundation (SOF).

(23) 5 26. Two dented ping pong balls were each placed in two beakers of water at different temperatures. What happened to the ping pong balls ?. (A) (B) (C) (D). CLASS 7 | 14th NSO - 2011. Beaker Volume of water (mL). Temperature of water (°C) Balls expanded in both the beakers. Ball expanded in beaker P and contracted in beaker Q. Ball expanded in beaker P and remained as such in beaker Q. Ball expanded in beaker Q and remained as such in beaker P.. P. Q. 500. 500. 25. 80. 27. Salt dissolves in water. You can dissolve more salt in a large amount of water than in a small amount. You can also dissolve more salt in hot water than in cold water. Nishita set up an experiment to see how much salt could be dissolved in water. Cylinders P and Q are of the same size. Cylinders R and S are of the same size. Cylinder R holds twice as much as cylinder Q.. The cylinders were all filled with water. Nishita added salt to each container, one spoonful at a time. She stopped when no more salt would dissolve in each cylinder.. Which cylinder contained the hottest water?. (A) Cylinder P . (B) Cylinder Q. (C) Cylinder R. (D) Cylinder S. 28. Study the given flow chart. . . Which of the following could be the materials of. V, W, X, Y and Z? V W. (A) Oil Metal. (B) Oil Rubber. (C) Water Rubber. (D) Water Rubber. X Plastic Wood Metal Plastic. Y Wood Metal Wood Metal. Z Rubber Plastic Plastic Wood. 29. The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as a liquid. When it comes out from the cylinder it becomes a gas (Process-X) and then it burns. (Process-Y). The following statements pertain to these changes. Choose the correct one. (A) Process-X is a chemical change. (B) Process-Y is a chemical change. (C) Both processes X and Y are chemical changes. (D) None of these processes is a chemical change.. 30. When acids are added to different indicators, some colour changes occur. These colour changes are listed below.. Identify P, Q, R, S and T respectively. P Q. (A) Colourless Methyl orange. (B) Colourless China rose. (C) Pink Methyl orange. (D) Pink China rose. R Blue Blue Blue Red. S Red Red Red Blue. T Yellow Yellow Reddish-brown Reddish-brown. Copyright©2015. Science Olympiad Foundation (SOF).

(24) 6. CLASS 7 | 14th NSO - 2011. 31. Rishi burnt a magnesium ribbon, and it burnt with a dazzling white flame. A powdery ash was formed. He collected the ash and dissolved it in water. The product formed and nature of the product could be _____.. (A) MgO, acidic (C) Mg(OH)2, basic . (B) MgO, basic (D) Mg(OH)2, acidic. 32. In summers, if milk is not refrigerated, it becomes sour. Which of the following is added by milkmen. to fresh milk to prevent the milk from spoiling? (A) Caustic soda (B) Potash alum. (C) Baking soda. (D) Lime water. 33. Sunita prepared two cups of water (one hot and one cold),. and then covered them. Look carefully at the results she obtained after 2 minutes.. Which of the following statements about the results is not true?. (A) Water vapour in the surrounding warmer air condenses on the cold metal cover of the cup containing water.. (B) Water particles from the hot water condense when they meet the cool inner surface of the metal cover.. (C) The insulated sides reduce heat loss or gain from the sides of the cup.. (D) When the heated particles of water vapour present in the air above the hot water hit the cold cover, they lose heat and condense.. 34. Megha performs a test on starch's presence. She takes a bowl of rice, a piece of bread, a slice of lemon and a slice of cheese. She puts two drops of iodine solution on each food item and notes her observation by putting tick () if the colour of the iodine changes or cross () if the colour of iodine does not change with the given food items. What will be her observation? Rice Bread Lemon Cheese. (A)    . (B)    . (C)    . (D)     35. Which of the following are good sources of roughage ?. (A) Milk, meat, soyabean, grains (B) Egg, curd, pulses, fruit juice. (C) Broccoli, fruits, carrot, spinach (D) Onion, yoghurt, cheese, pulses. 36. Which of the following statements is/are correct ?. (i) (ii) (iii) (A). Synthetic cloth easily absorbs sweat. Silk is prepared from the cocoon of the silkworm. Terrycot is made from cotton blended with jute fibres. (i) only (B) (ii) only (C) (ii) & (iii). 37. Spinning is done by _____.. (A) Charkha (B) Takli. (C) Both (A) & (B). 38. What does the given figure show ?. (A) Response to stimulus. (B) Response to photosynthesis. (C) Response to respiration. (D) Response to transpiration. Copyright©2015. Science Olympiad Foundation (SOF). (D) (i), (ii) & (iii). (D) None of these..

(25) 7. CLASS 7 | 14th NSO - 2011. 39. The leaves are arranged in different ways in different plants to get maximum exposure of the. sunlight. This arrangement is called ______. (A) Venation (B) Phyllotaxy. (C) Geotropism. (D) Phototropism.. 40. Read the given statements and select the correct option.. Statement 1 : The bodies of birds are streamlined.. Statement 2 : Birds have hollow and light bones. (A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. (B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. (C) Statement 1 is true but statement 2 is false. (D) Both statements 1 and 2 are false.. 41. From which of the four chambers of ruminant stomach, semi-digested food is moved back to mouth ?. (A) Rumen (B) Abomasum (C) Omasum (D) All of these 42. Which one of the following is a correct match? Type of teeth Function. (A) Incisors Biting and cutting. (B) Canines Crushing and grinding. (C) Molars & premolars Piercing and tearing. (D) Molars Smaller than premolars 43. Cocoons are treated with. (i). to dissolve the gummy substance that holds the cocoon filament. in place. After this, filaments of (ii) cocoons are joined and twisted. This is combined with other similarly twisted filaments to make. (iii). or reeled silk. The reeled silk is made into. (iv). from. which silk clothes are woven by weavers.. Select the correct sequence of terms to complete the above paragraph.. (i). (A) Chilled water. (B) Chilled water. (C) Boiled water. (D) Boiled water . (ii) 4-8 12-15 4-8 12-15. (iii) Raw silk Smooth silk Raw silk Smooth silk. (iv) Skeins Skeins Skeins Skeins.. 44. Which of the following conditions at night will make it warmer ?. (A) When sky is clear, without clouds (B) When sky is cloudy. (C) When humidity is low (D) When wind blows fast. 45. Beena performed an experiment on two soil samples X and Y as shown, to study the absorption of water by the soil. She poured 100 ml of water in both. X. Y. the samples and noted the percolated water. Identify X and Y. . (A). (B). (C). (D). X Laterite soil Loamy soil Sandy soil Clayey soil. Y Sandy soil Desert soil Clayey soil Sandy soil. Water. 60 ml 20 ml. 46. Which of the following types of feet are adapted to run on flat ground and to grip prey. respectively ? (A) (iii) & (iv) (B) (i) & (iii) (C) (ii) & (i) (D) (iv) & (ii) Copyright©2015. Science Olympiad Foundation (SOF).

(26) 8. CLASS 7 | 14th NSO - 2011. 47. Rainwater harvesting is an important method for _____.. (A) Treating sewage water (B) Recycling water from factories. (C) Raising ground water level (D) Industrial purposes. 48. Which of the following does not happen during exhalation ?. (A) The space in chest cavity decreases (B) Diaphragm goes up. (C) Air is released (D) Ribs are pushed upward and outward. 49.. What is peculiar about pulmonary artery and pulmonary vein ? (A) Pulmonary artery carries carbon dioxide-rich blood and pulmonary vein carries oxygen-rich blood. (B) Pulmonary artery carries oxygen-rich blood and pulmonary vein carries carbon dioxide-rich blood. (C) Both pulmonary artery and vein carry carbon dioxide-rich blood from the heart to the lungs. (D) Both pulmonary artery and vein carry oxygen-rich blood from the lungs to the heart.. 50.. Refer the given figure. What are X and Y and what do they grow into ? (A) X-Radicle and Y-Plumule; both grow into roots. (B) X-Plumule and Y-Radicle; both grow into shoot and leaves. (C) X-Radicle, grows into roots; Y-Plumule, grows into shoot and leaves. (D) X-Plumule, grows into shoot and leaves; Y-Radicle, grows into roots. SPACE FOR ROUGH WORK. Copyright©2015. Science Olympiad Foundation (SOF). X. Y.

(27) Class 7 15th. SET A Year 2012. Copyright©2015. Science Olympiad Foundation (SOF).

(28) 2. 15th NSO - SET A. MENTAL ABILITY 1.. Fill in the blank :. The line segment joining a vertex of a triangle to the mid-point of its opposite side is called a. ______ of the triangle. (A) Altitude. 2.. Which of the following solids is made of the greatest number of unit cubes ?. (A). 3.. A freezing process requires the room temperature to be lowered from 40°C at the rate of 8°C every. hour. The room temperature 4 hours after the process begins is _______. (A) –8°C (B) 8°C (C) 72°C (D) –72°C. 4.. What is the smallest number of squares that must be added so that the line. AB becomes a line of symmetry? (A) 5 (B) 4 (C) 2 (D) 3. 5.. The entrance charges for a resort are shown in the given table.. Mr. Rajiv drove to the resort with his wife Radhika. (B) Median. (B). (C) Hypotenuse. and three children on Saturday at 1.30 pm. They left the resort at 8 p.m on the same day. How much. (C). (D) None of these. (D). Entrance Fee. ` 200 per car. Monday to Friday. ` 75.50 per passenger. Saturday and Sunday. ` 110.50 per passenger. Parking charges. ` 40.50 per hour. did Mr. Rajiv and his family have to pay in all ? (A) ` 1015.75 (B) ` 1076.50. 6.. Find the missing figure in the given series ?. (A). 7.. Megha's salary in September was ` 18,000. Her salary in October was ` 16,000. What was the. percentage decrease in her salary? (A) 12.5 % (B) 8.8 %. 8.. Mohit borrowed ` 12,000 from his friend. He gave ` 2000 at 18% and the remaining amount at 15%.. How much interest did he pay in 3 years? (A) ` 5580 (B) ` 8550. 9.. If the code of RIGHT is SGJDY, what is UPDZJ the code for? (A) VERSE (B) VALID (C) TRAIN. (B). (C) ` 815.50. (D) ` 1036. (C). (D). (C) 11.11 %. (C) ` 5508. Copyright©2015. Science Olympiad Foundation (SOF). (D) 7.5 %. (D) ` 5055 (D) TRADE.

(29) 3. 15th NSO - SET A. 10. Beena bought. 7. m of cloth. She used. 8 How much cloth did she have left? 1 7 (B) (A) m m 8 36. 2 3. m to sew a dress and. (C). 5 72. 1 3. m of the remainder for a skirt.. m. 11. Amit, Priya, Latika, Garima and Rahul all go into a shop.. l Only Garima buys a samosa.. l Priya, Latika and Rahul buy a chocolate each.. l Everyone except Priya buys an ice cream each.. l Priya is the only one who buys toffees.. l Nobody except Amit and Latika chooses a burger.. l Each of the girls buy a packet of chips.. Which child buys the most number of items?. (A) Priya (B) Garima (C) Latika. (D). 5 36. m. (D) Amit. 12. In the given figure, PQ = PR and S is the midpoint of QR. Then. DPSQ @ DPSR by ________ congruence. (A) SAS (C) Both (A) and (B) . (B) SSS (D) None of these. . 13. What is the average number of ribbons made by the 5 girls ?. (A) 42. (B) 50. (C) 45. (D) 48. 14. Which of the following conditions is INCORRECT on the basis of the given figure, where l || m?. (A) ∠3 + ∠5 = 180° . (B) ∠3 =∠6. (C) ∠2 = ∠6 . (D) ∠1 + ∠4 = 180°. 15. Rohan is 12 years older than Kareena. After four years, Rohan's age will be equal to thrice the age of Kareena. Find the present age of Rohan.. (A) 2 years (B) 12 years (C) 14 years (D) 4 years. science 16. The warm water is poured slowly into a beaker of ice cubes as shown in figure. Which of the following options is correct, when the warm water was poured into the beaker ?. 1. The ice starts to melt. . 2. The glass expands.. 3. The temperature of the ice increases. 4. The temperature of the warm water decreases.. (A) 1 and 4 only (B) 2 and 4 only (C) 1, 3 and 4 only. (D) All of these. 17. In which direction does the frictional force always act on an object moving across a horizontal surface ?. (A) In the direction of the gravitational force (B) Opposite to the direction of the gravitational force. (C) In the direction of motion (D) Opposite to the direction of motion Copyright©2015. Science Olympiad Foundation (SOF).

(30) 4. 15th NSO - SET A. 18. The graph shows the first few seconds of a car's journey.. From the graph it can be seen that the car travels (A) At increasing speed and then stops (B) At constant speed and then slows down (C) With constant acceleration and then at constant speed (D) With constant acceleration and then stops. 19. In the game of basketball, the ball is bounced (with no spin) towards a player at an angle of. 40 degrees to the normal. What will be the angle of reflection? (A) 30° (B) 45° (C) 60°. (D) 40°. 20. How does cyclone decrease the fertility of the soil in the coastal areas?. (A) By flooding the land with saline water (B) By dissolving soil and rocks. (C) By increasing the water table of the place (D) By decreasing the water table of the place 21.. In the figure Y, magnet P is experiencing ________.. 1. Magnetic force of repulsion 3. Elastic spring force (A) 1 and 3 only (B) 1 and 4 only. 2. Magnetic force of attraction 4. Gravity (C) 2 and 3 only (D) 2 and 4 only. 22. The temperature shown by a mercury-in-glass thermometer increases. Which of the following is. constant? (A) Density of the mercury (C) Mass of the mercury . 23.. When an electron moves from negative electrode to positive electrode, (A) Negative charge moves from negative electrode to positive electrode (B) Positive charge moves from positive electrode to negative electrode (C) No charge flows from either electrode to other electrode (D) Both (A) and (B). (B) Internal energy of the mercury (D) Volume of the mercury. 24. Which of the following is not caused by friction or resistive forces?. (A) A match lightning as it strikes a match box. (B) A car braking to a stop.. (C) A pebble accelerating as it falls to the ground. (D) A meteor glowing as it falls through the atmosphere. 25. The average velocity of a body is equal to mean of its initial velocity and final velocity. The. acceleration of the body is (A) Variable (B) Zero. (C) Negative. (D) Uniform. 26. A reaction is carried out in a test tube as shown in figure. A gas comes out . with hissing sound and bubbles. Which of the given test will confirm the presence of the gas which comes out? (A) Bring a burning splinter near the mouth of the gas tube, it burns brightly. (B) Pass the gas into lime water, it turns milky.. (C) Pass the gas in red litmus solution, it turns blue.. (D) Pass the gas into copper sulphate solution, it turns green. Copyright©2015. Science Olympiad Foundation (SOF).

(31) 5. 15th NSO - SET A. 27. Shuchi conducted an experiment to find the amount of light that could pass through four different materials. She recorded her results in the table below.. . Material. Amount of light (lux). P. 30. Q. 120. R. 0. S. 60. Which of the above material is most suitable for making the lens of the magnifying glass?. (A) P. (B) Q. (C) R. (D) S. 28. The table below shows the colours and solubilities of four solids in water.. Solid. Colour. Solubility in water. W. Blue. Insoluble. X. Blue. Soluble. Y. White. Insoluble. Z. White. Soluble. A mixture containing two solids is added to excess water, stirred and filtered. A blue filtrate and a white residue are obtained. Which two solids are present in the mixture? (A) W and X (B) W and Y (C) X and Y (D) X and Z. 29. Five solutions have been taken in five test tubes labelled as A, B, C, D and E. They are tested with four indicators and the observations are recorded.. Solution. Methyl Orange. Blue litmus. Red litmus. Phenolphthalein. A. Red. Red. Red. Colourless. B. Red. Red. Red. Colourless. C. Yellow. Blue. Blue. Pink. D. Orange. Blue. Red. Colourless. E. Red. Red. Red. Colourless. Which of the above solutions can neutralise each other? (A) A and B (B) D and E (C) B and C. (D) B and D. 30. Some blobs of wax are placed on a silver ring as shown in the diagram. If the ring is heated at X, then choose the correct option regarding the melting of wax because of heating.. (A) Only R blob melts. . (B) Blobs R, S and Q melt together.. (C) Melting of blobs occurs in the order R, Q, S and P.. (D) P, Q, R and S blobs melt together. 31. Reena prepared China rose indicator by keeping the petals of the flower in hot water for some time. She used the coloured solution for testing three solutions A, B and C. Solution A turns to dark pink, solution B remains light pink and solution C turns to green. Mark the correct option. Solution A Solution B Solution C. (A) Lemon juice. Sugar solution. Milk of magnesia. (B) Lemon juice. Orange juice. Sugar solution. (C) Orange juice. Vinegar . Salt solution. (D) Salt solution. Milk of magnesia. Lemon juice. Copyright©2015. Science Olympiad Foundation (SOF).

(32) 6. 15th NSO - SET A. 32. The given flow chart is used to show some similarities and differences among four objects P, Q, R and S. One of the objects is a copper coin.. Identify the copper coin from the given information.. (A) P. (B) Q. (C) R. (D) S. 33. The given diagram shows a covered cup of hot chocolate. After some time, most of the heat from the hot chocolate is lost to the surroundings through the _________.. (A) Steel lid. (B) Marble tile. (C) Foam cup . (D) Wooden table. 34. Observe the given Venn diagram. What does X and Y show ?. (A) X - Jute, Y - Flax. (B) X - Flax, Y - Jute. (C) X - Jute, Y - Cotton. (D) X - Cotton, Y - Jute. 35. Priya wants to test presence of proteins in some food items. She took a cup of milk, some groundnuts and a raw potato. She made a paste of raw potato and powder of groundnuts by mashing and grinding them. She put equal quantities of three food items in three different test tubes and added, using a dropper ten drops of water, two drops of copper sulphate solution and ten drops of caustic soda solution to each test tube. She shook well all the three test tubes and let them stand for a few minutes.. What result would she get for the test she performed ? [(+) indicates violet colour] Potato Groundnuts Milk. (A) +++ ++++ +. (B) ++++ – ++. (C) – + ++++. (D) + +++ – . Activity. 36. Read the given activity. What would you most. likely observe for the plant and why ?. Take a potted plant. Put it in a cardboard box. (A) The plant would bend towards the hole because it has to exchange gases through hole.. and close the box. Make a hole on one side of. the cardboard box in such a way that light enters. only through this hole. Keep watering the plant (B) The plant would grow upright inside the box because it regularly for a few days. is getting all the essential requirements for growth. (C) The plant would grow upright inside the box because it is not getting direct sunlight. (D) The plant would bend towards the hole because plant responds to light.. Copyright©2015. Science Olympiad Foundation (SOF).

(33) 7. 15th NSO - SET A. 37. Arpita took a strip of blotting paper of 3 cm × 5 cm and clipped one half on the upper surface and the other half on the lower surface of a leaf. What would she most likely observe after one hour ?. (A) Blotting paper clipped on the upper surface is more wet.. (B) Blotting paper clipped on the lower surface is more wet.. (C) Blotting paper is equally wet on both the surfaces of the leaf.. (D) The observation cannot be predicted. 38. Leaves may be simple or compound. Which of the. given figures can be called as compound leaves? (A) (a) only (B) (b), (c) and (d) (C) (a) and (d) (D) All of these. 39.. Which among the following is an odd one ? (A) Desert : Stems store water (B) Pond : Animals with streamlined bodies (C) High altitude : Increase in RBC (D) Rainforests : Camouflage to escape from enemies. 40. Which of the following encloses the portion of your body below the stomach ?. (A). (B). (C). (D). 41. Charkha is used for ______.. (A) Spinning. (B) Ginning. 42.. "Fats are stored beneath the skin and around the heart and kidneys". It is because _______. (A) When we are short of energy, our body uses stored fats (B) The stored fats in our body help to keep us warm (C) Fats act as shock absorber and protect internal organs from injury (D) All of these. 43. Select the correct pair.. (A) Spinach – Leaves . (C) Cauliflower – Roots. (C) Weaving. (B) Carrot – (D) Onion –. (D) Knitting. Stem Flowers. 44. The function of scissors is synonymous with the function of _____.. (A) Incisors (B) Premolars (C) Canines 45. Match Column-I with Column-II and select Column-I Column-II. (a) Salivary gland (i) Breaks down. (b) Intestinal gland (ii) Breaks down. (c) Pancreas (iii) Breaks down. (d) Liver (iv) Breaks down. (A) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i). (C) (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv). (D) Molars. the correct option from the codes given below. fats proteins into peptides peptides into amino acids starch into sugar (B) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv) (D) (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i). 46.2 Which of the following is incorrect regarding exhalation process in breathing mechanism ?. (A) Air moves out. (B) Diaphragm relaxes.. (C) Chest cavity becomes smaller. (D) External intercostal muscles contract.. Copyright©2015. Science Olympiad Foundation (SOF).

(34) 8. 15th NSO - SET A. 47.2 Garima took a plant and placed it in the dark for 24 hours to de-starch its leaves. After that she performed an activity as shown here.. (i) She put one leaf (marked as X) in clean plastic bag containing soda lime and another leaf (marked as Y) in a clean plastic bag containing water. Then she left the plant. in sunlight for 6 hours. (ii) She took out the leaves and boiled them in alcohol. (iii) She performed the iodine test on the leaves. Select the option with correct iodine test results and the conclusions of the activity. Leaf Y CO2 is necessary. Leaf X CO2 is necessary (Iodine test) for photosynthesis (Iodine test) for photosynthesis. (A)  Yes  No. (B)  Yes  Yes. (C)  No  Yes. (D)  No  No. 48.. 'Silk has come under fire from animal rights activists'. Why ? (A) Because female silkmoth is reared to lay hundreds of eggs at a time. (B) It takes approximately 630 cocoons to make a silk blouse. (C) Cocoons are collected and put into very hot water, killing the silkworm inside them. (D) After hatching, the silkworms are fed on mulberry leaves continuously for six weeks.. 49. Sandeep has three soil samples X, Y and Z, each with weight 50 g. 100 mL of water is poured drop by drop with the help of a dropper on all the soil samples. The given graph shows weight of water absorbed by each soil sample.. Select the correct option regarding the soil samples.. (A) X is a mixture of sand, silt and a good amount of clay.. (B) Y is a mixture of sand, silt and appropriate amount of clay.. (C) Z is a sandy soil with very little clay.. (D) Z is a mixture of clay and silt with higher amount of sand. 50. The given figure shows _____.. (A) Seed dispersal carried out by explosion. (B) Seed dispersal carried out by wind. (C) Seed dispersal carried out by insect. (D) Seed dispersal carried out by sunlight SPACE FOR ROUGH WORK. Copyright©2015. Science Olympiad Foundation (SOF).

(35) Class 7 15th. SET B Year 2012. Copyright©2015. Science Olympiad Foundation (SOF).

(36) 15th NSO - SET B. 1. MENTAL ABILITY 1.. Which of the following statements is INCORRECT? (A) All integers and fractions are called rational numbers. (B) The number 0 is neither a positive nor a negative rational number. (C) There are limited number of rational numbers between two rational numbers. p (D) A number that can be expressed in the form , where p and q are integers and q ≠ 0 is called a rational q. number.. 2.. Aman rotated a game piece 270° clockwise around vertex V. Which of . the following represents the position of the game piece after the 270° clockwise rotation?. (A). (B). (C). (D). 3.. Lengths of some world's longest snakes are 9, 9, 4.3, 6, 6.5, 2.6, 5.6, 9. The range, in metres, of the lengths is _____. (A) 6.25 (B) 6.4 (C) 6.5. (D) 9. 4.. Solve for x : x + 3 − x + 4 = x + 5 − x + 6 4 5 6 7 (A) –1 (B) 1. (D) 2. 5.. Amit, Raj, Kunal, Harsh and Armaan used different types of transport during the holidays. I. Everyone except Harsh travelled on the bus. II. Kunal, Harsh and Armaan all went on an aeroplane. III. Everyone except Raj went in a taxi. IV. Amit and Harsh both had a ride on a tram. V. Raj travelled on a bus and then a train to get to his holiday destination. Who used the fewest types of transport during the holidays? (A) Amit (B) Raj (C) Harsh (D) Armaan. 6.. The least number which when increased by 5 is divisible by each one of 24, 32, 36 and 54, is ____. (A) 427 (B) 859 (C) 869 (D) 4320. 7.. The given table shows a relationship between x and y. . The (A) (B) (C) (D). 8.. The records of a sporting goods company shows that 4 out of every 100 footballs manufactured have some defect. The probability of drawing a football that will NOT have a manufacturing defect is ______. 1 1 1 24 (B) (C) (D) (A) 25 1 4 25. 9.. (C) 0. equation which is true for each of the ordered pairs in the table is ____. y = 3x + 2 y = 2.5x + 6 y = 3.5x + 2 y = 3x + 6. x 0 2 4 6 8. y 2 9 16 23 30. 60% of the population of city were men and the rests were women. Afterwards, 840 men left the city and 1000 women came to the city. As a result, the percentage of the men reduced to 56% of the population. The present population of the city is _____. (A) 23420 (B) 24300 (C) 23240 (D) 23400 Copyright©2015. Science Olympiad Foundation (SOF).

(37) 15th NSO - SET B. 2. 10. In the problem set, given below three figures are similar in a certain manner. However, one figure is not like the other three. Choose the figure which is different from the rest.. (A). (B). (C). (D). 3 11. In what time will the interest on a certain sum of money become   8 of 6% p.a. simple interest?. (A) 5 years (B) 10 years (C) 8 years 1 1 4 − 4 + 2.8 + − 2.32 = 5.33 , then x is _____. 4 5 x (A) 0.05 (B) 0.5. th. of the amount at the rate (D) 6 years. 12. If 8. (C) 5. (D) None of these. 13. Select the figure which is embedded in the given figure (X).. (A). (B). (C). (D). 14. Which of the following numbers is divisible by 9?. (A) 823519 (B) 270351 (C) 612593. (D) 759803. 15. The elevator descends into a mineshaft at the rate of 8 m/min. If the descent starts from 20 m. above the ground level, the time taken by the elevator to reach – 300 m is _____. (A) 30 mins (B) 40 mins (C) 50 mins (D) 1 hr. SCIENCE 16. A switch is used to turn an appliance on and off. Which is the safest position for the switch ?. (A) On the live wire (B) On the neutral wire (C) On the heating element (D) On the earth wire 17. Match the Column-I with Column-II and select the correct option from the codes given below.. (a) (b) (c) (A). Column-I Body moving with uniform speed (i) Body moving with non-uniform speed (ii) When a body is at rest (iii) (a)-(iii), (b)-(ii), (c)-(i) (B) (a)-(i), (b)-(iii), (c)-(ii) (C). Column-II Straight line parallel to the time axis A curve having increasing slope. Straight line inclined to the axis. (a)-(ii), (b)-(i), (c)-(iii) (D) (a)-(i), (b)-(ii), (c)-(iiii). 18. When Beena compresses the spring as shown in figure, which of the following occur?. (i) Her hand exerts a pushing force (iii) The spring exerts a pushing force (A) (i) and (iii) only (B) (i) and (iv) only. (ii) Her hand exerts a pulling force (iv) The spring exerts a pulling force (C) (ii) and (iii) only (D) (ii) and (iv) only. Copyright©2015. Science Olympiad Foundation (SOF).

(38) 15th NSO - SET B. 3. 19. If a pin is placed in front of, and to the right of a plane mirror as. P. Q. shown in figure. Where is the image of the pin formed?. (A) P . (B) Q. (C) R . (D) S. R. S Pin Observer. 20. Study the distance-time graph of a toy car, given in the figure. and choose the incorrect statement from the following.. (A) The toy car is fastest during first 10 seconds.. (B) The toy car is slowest in between 10 and 20 seconds.. (C) Distance travelled during last 10 seconds is 5 m.. (D) None of these. 21. Bulb does not glow when the probs are hanged in air. The reason is _______.. (A) Air absorbs the electricity (B) Air is a bad conductor of electricity. (C) Electricity is discharged into air (D) Air disperses the electricity 22. Which of the following cannot be turned into a magnet ?. (A) Copper coil (B) Steel bar (C) Iron bar. (D) Nickel disc. 23. What conclusions do you draw about the nature of motion of an object . from the given velocity-time graph s ? (A) In graph (a) object is moving with retardation and in graph (b) object is moving with constant acceleration. (B) In graph (a) object is moving with retardation and in graph (b) object is moving with variable acceleration. (C) In graph (a) object is moving with positive acceleration and in graph (b) object is moving with variable acceleration. (D) In graph (a) object is moving with positive acceleration and in graph (b) object is moving with constant acceleration.. 24. Mohan takes 15 minutes to go from his home to school and 30 minutes for the return journey. If. the distance between the school and the home is 4.5 km, what is his average velocity? (C) 4 m s–1 (D) 3 m s–1 (A) 0 (B) 5 m s–1. 25. The factor which contribute to the development of cyclones is/are. (i) Wind speed (A) (i) only. (ii) Temperature (B) (ii) and (iii) only. (iii) Humidity (C) (i) and (iiii) only. 26. Four rods of equal length and thickness but of different materials are coated with wax in the same manner. They are fixed to a trough containing hot water. The given diagram illustrates what happens to the wax on each rod after five minutes.. (D) All of these. Hot water. Metal trough. Aluminium rod Brass rod Copper rod Glass rod Wax coating on rod. What can you conclude from the given diagram? (i) Aluminium rod can conduct heat better than the brass rod. (ii) The aluminium rod conducts heat better than the copper rod. (iii) The glass rod conducts heat better than the copper rod. (iv) The wax on the copper rod melts faster than the wax on the brass rod. (A) (i) and (iv) only (B) (ii) and (iii) only (C) (i), (ii) and (iii) only (D) (ii), (iii) and (iv) only Copyright©2015. Science Olympiad Foundation (SOF).

(39) 15th NSO - SET B. 4. 27. Which of the following diagram(s) represents alkalis and bases in the correct form?. (A) (i) only . (B) (iii) only. (C) (i) and (iv) . (D) (iii) and (iv). 28. The given diagram shows a bimetallic strip made of brass and steel. It is clamped at its centre. The bimetallic strip is heated. Which one of the following shows the strip after it has been heated ?. Note : Brass expands more than steel upon heating. . (A). (B). (C). (D). 29. A metallic piece (X) is dropped into copper. sulphate solution. After some time, the blue colour of the solution changes to green which shows a chemical change has taken place. Which metal has been dropped into the solution and what is the name. of the new substance formed? (A) Metal X is iron and the substance formed is ferrous sulphate. (B) Metal X is silver and the substance formed is silver sulphate. (C) Metal X is zinc and the substance formed is zinc sulphate. (D) Metal X is magnesium and the substance formed is magnesium sulphate.. 30. How will you identify the given solutions if you are provided. with only one indicator-methyl orange?. (A) The solutions can not be identified by the help of methyl orange. 31.. only. (B) Methyl orange changes to red in both acidic and neutral solutions and yellow in basic solution. (C) Methyl orange remains orange in acidic solution while changes to yellow in basic and neutral solution. (D) Methyl orange changes to red in acidic solution, yellow in basic solution and remains orange in neutral solution. Study the given Venn diagram. Which group does copper belong to? (A) P (B) Q (C) R (D) S. 32. Beena performed an experiment in which she took four beakers containing different amount of water at different temperatures. She added equal amount of salt into each beaker.. Identify the beaker in which salt takes the shortest time to dissolve. (A) Beaker 1 (B) Beaker 2 (C) Beaker 3 Copyright©2015. Science Olympiad Foundation (SOF). (D) Beaker 4.

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