the current through bulb C is more than the current through bulb A

(a) Both statement 1 and statement 2 are true and statement 2 is the correct explanation of statement 1.

(b) Both statement 1 and statement 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) Statement 1 is false but statement 2 is true.

24. the body will speed up if _______.

(a) Velocity and acceleration are in same direction (b) Velocity and acceleration are in opposite direction (C) Velocity and acceleration are in perpendicular direction

(D) None of these

25. A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in the water, the force on the bottom of the vessel in contact with the cube

28. Study the given diagram carefully and identify X and y respectively.

(a) Conc. HCl, CO₂ (b) Conc. H₂SO₄, HCl (C) Conc. HNO₃, H₂ (D) Conc. NaOH, Cl₂

29. Raghav, ajay and Nita were given three test tubes K, l and m respectively containing unknown substances. they observed the following properties about their solutions.

Substance Property

K The components can be separated by filtration.

l Particles scatter the light.

m Particles size is 10^–9 to 10^–7 m.

On the basis of the above properties, identify the solutions K, l and m respectively.

(a) Ferrous sulphate solution, tonics, paints (b) Calcium carbonate solution, paints, milk (C) Muddy water, milk, calcium carbonate solution

(D) Paints, ferrous sulphate solution, calcium carbonate solution 30.

R gives back P and Q on saponification. Identify P and Q respectively.

(a) CH₄, CH₂ CH₂ (b) CH₃CH₂OH, CH₂ CH₂

(C) CH₃COOH, CH₃COOC₂H₅ (D) CH₃CH₂OH, CH₃COOH

31. match Column-i with Column-ii and select the correct option from the codes given below.

Column-i Column-ii

(a) avogadro number (i) 63

(b) molar volume (ii) C₆H₁₂O₆

(c) Nitrogen element (iii) 22,400 cm³

(d) Formula of glucose (iv) 6.022 × 10²³ (e) molecular weight of nitric acid (v) Diatomic

(a) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv), (e)-(v) (b) (a)-(iv), (b)-(iii), (c)-(v), (d)-(ii), (e)-(i) (C) (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii), (e)-(v) (D) (a)-(i), (b)-(ii), (c)-(iv), (d)-(v), (e)-(iii) 32. Select the pairs of elements which form compounds by covalent bonding.

(i) Ca and S (ii) P and Cl (iii) S and O (iv) F and O (a) (i), (ii) and (iii) (b) (ii) and (iii) (C) (i), (iii) and (iv) (D) (iii) and (iv)

33. ankit prepared 25% glucose solution in 180 g water. He stirred the solution for sometime to form a saturated solution. if solubility of sugar is 30 g/100 g water, then how much sugar remains undissolved in the solution?

(a) 24 g (b) 30 g (C) 6 g (D) 10 g

34. Rohit categorized the elements P, ar, b and al into two categories.

Category i : elements with same valency.

Category ii : elements with same number of shells.

Select the option with correct categorisation of the given elements.

(a) I → P, B, Al; II → P, Ar, Al (b) I → Al, B; II → P, Ar (C) I → Ar, B; II → P, Al (D) I → P, Al; II → B, Ar

15th NSO - SET B 4

35. the correct chemical formulae of the given compounds:

(i) aluminium phosphate, (ii) Potassium permanganate and (iii) ammonium carbonate are (a) (i)-Al₂PO₄, (ii)-K₂Mn, (iii)-NH₄CO₃ (b) (i)-AlPO₄, (ii)-KMnO₄, (iii)-(NH₄)₂CO₃ (C) (i)-Al(PO₄)₃, (ii)-KMn, (iii)-NH₄C (D) (i)-Al₃PO₄, (ii)-KMnO, (iii)-NH₄CO 36. the given diagram shows the electrolysis of a concentrated aqueous solution

containing both copper (ii) ions and sodium ions. Which metal is deposited at the negative electrode and why?

metal deposited Reason

(a) Copper Copper is less reactive than sodium (b) Copper Copper is more reactive than hydrogen (C) Sodium Copper is less reactive than hydrogen (D) Sodium Copper is more reactive than sodium

37. a compound of carbon, hydrogen and nitrogen contains these elements in the ratio 9 : 1 : 3.5.

if its molecular mass is 108, what is the molecular formula?

(a) C₂H₂N (b) C₃H₄N (C) C₂HN₂ (D) C₆H₈N₂

38. Which of the following statements is incorrect about the trends in periodic properties in the periodic table?

(a) Metallic character increases from Li to Cs.

(b) The acidity of oxides increases from left to right in a period.

(C) Noble gases have the highest electron affinity among all the elements in the periodic table.

(D) Ionisation energy of aluminium is lower than that of magnesium.

39. Gita is supposed to face an interview. During the first five minutes before the interview she experiences sweating, increased rate of heart beat, increased respiratory rate, etc. Which of the following hormones has increased in her blood and is responsible for her restlessness?

(a) GnRH (b) Estrogen (C) Adrenaline (D) Insulin

40. the given graph shows the changes in the volume of the lungs of a person at rest over a period of 20 seconds.

(i) How many breathes per minute was the person taking when at rest?

(ii) at which two points on the graph C, D, e or F was the alveolar pressure in the lungs equal to the air pressure outside of the body?

the fossil found in layer y resembles the fossil found in layer X. this similarity most likely suggests that

(a) The fossil of layer X must be more complex than that of layer Y

(b) Modern forms of life may have evolved from earlier forms of life (C) The fossil of layer Y was formed before the fossil of layer X

(D) Vertebrate fossils are found only in sediments

15th NSO - SET B 5

42. identify the given developmental stage of human embryo and select the correct option regarding it.

Developmental stage Site of implantation

(a) Blastocyst Uterine wall

(b) Morula Uterine wall

(C) Blastula Mid part of Fallopian tube

(D) Gastrula Mid part of Fallopian tube

43. albinism is an inherited condition caused by a recessive allele a. a is the dominant allele for the normal condition.

What are the genotypes of individuals R and S?

R S

(a) AA AA

(b) AA Aa

(C) Aa Aa

(D) aa aa

44. The given figures show different types of animal tissue. Identify their locations and select the correct option.

(i) (ii) (iii) (iv) (v)

(a) Gall bladder Gastric glands Thyroid glands Lungs alveoli Fallopian tubes (b) Gastric glands Gall bladder Lungs alveoli Bronchi Coelomic cavity (C) Intestinal glands Sweat glands Fallopian tubes Choroid layer of eye Nasal passage (D) Sweat glands Intestinal glands Bronchi Ciliary body of eye Trachea 45. Which phylum do the given animals (i), (ii), (iii) and (iv) belong to?

(i) (ii) (iii) (iv)

(a) Annelida Platyhelminthes Coelenterata Echinodermata

(b) Annelida Platyhelminthes Echinodermata Coelenterata

(C) Platyhelminthes Annelida Coelenterata Echinodermata

(D) Platyhelminthes Annelida Echinodermata Coelenterata 46. Refer the given Venn diagram and select the correct

option.

(a) P - Golgi apparatus; R - Microtubules (b) Q - Endoplasmic reticulum; R - Ribosomes (C) S - Microtubules; Q - Ribosomes

(D) S - Golgi apparatus; P - Lysosomes

15th NSO - SET B 6

47. Read the given statements and select the correct option.