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CAREER POINT

PRE FOUNDATION DIVISON

NSO Stage-II Exam.-2016

CLASS-10

SCIENCE

Date : 14-02-2016 Q.1 The given figure shows a V shaped wire lying

in x-y plane. A current of l ampere flows in the wire. The direction of the magnetic field at point P which lines in the same plane is along

(A) Negative x-axis (B) Positive x-axis (C) Negative z-axis (D) Positive z-axis

Q.2 Which of the following is the correct set-up for determining the equivalent resistance of two resistors R1 and R2 when connected in

parallel?

(A)

(B)

(C)

(D)

Q.3 Refractive index of medium 1 with respect to medium 2 is µ and refractive index of medium 3 with respect to medium 4 is . If the velocity of light in medium 2 is v and that in medium 3 is v, then the refractive index of medium 2 with respect to medium 4 is - (A) ' v v  (B) v ' v  (C) v ' v   (D) ' v v  

Q.4 The given figure shows a diagram of eye.

Which of the following correctly lists the names of marked parts of the eye?

(1) (2) (3) (4)

(A) Pupil Lens Iris Cornea (B) Iris Cornea Pupil Lens (C) Pupil Cornea Iris Lens (D) Iris Lens Pupil Cornea

Q.5 The diagram shows a circuit in which all the switches are open.

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Which of the following switch positions would give a resistance of 4  between X and Y?

S1 S2 S3 S4 (A) Closed Open Open Closed (B) Closed Open Closed Open (C) Open Closed Open Closed (D) Open Closed Closed Open

Q.6 Three glass prisms A, B and C of the same refractive index are placed in contact with each other as shown in the figure with no air gap between the prisms.

A ray of light OP passes through the prism assembly and emerges as QR. The condition of minimum deviation is satisfied in the prisms.

(A) A and C only (B) B and C only (C) A and B only (D) A, B and C only

Q.7 A current-carrying conductor is placed between two bar magnets.

Which of the following about the poles of the bar magnets X and Y and the movement of the conductor is correct?

X Y Direction of movement of the conductor

(A) South North No movement (B) North South Towards P (C) South North Towards P

(D) North South No movement

Q.8 Which of the following statements is incorrect?

(A) Asphalt which is obtained in the fractional distillation of crude oil, is not used as fuel.

(B) Liquefied petroleum gas has a lower calorific value than methane.

(C) Natural gas is lighter than air.

(D) When coal is heated strongly in the presence of air, it changes into coke.

Q.9 In case of a concave mirror, an object is placed at a distance of x1 from focus and

image is formed at a distance of x2 from

focus. Then, focal length of mirror is - (A) x1x2 (B) 2 x x12 (C) 2 x x12 (D) Data insufficient

Q.10 Figure shows a current carrying wire in the plane of the paper. The two points P and Q shown in figure are in the plane of wire. Which of the following statements is/are correct?

(i) The direction of magnetic field at point P is out of the plane of paper and that at point Q is into the plane of paper.

(ii) The direction of magnetic field at point Q is into the plane of paper.

(iii) Strength of magnetic field is same at both points P and Q irrespective of r1 and r2.

(iv) If r1 > r2, magnetic field at point Q is

greater than that at point P.

(v) If direction of current in the wire is reversed, the strength of magnetic field at points P and Q will change.

(A) (i) only

(B) (ii) and (iii) only (C) (i), (iii) and (v) only

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Q.11 The given diagrams shows the path traced by a light ray travelling in air in two media X and Y.

Which of the following diagrams about the path of light in these two media is correct?

(A) (B)

(C) (D)

Q.12 Refer to the given table.

Fuels Calorific value (kJ/g) Ignition tempera- ture (ºC) By-products Other properties  25 50 CO,H2O It is cheap  48 80 CO2,H2O It is convenient to store

 50 75 SO2,CO It is easily available

 52 78 SO2,SO3 It burns smoothly Which of the following fuels will be a good choice for domestic use?

(A)  (B)  (C)  (D) 

Q.13 The diagram shows a magnet moved into, and out of a coil of wire, Which of the following options correctly describes the poles induced in the coil at X by the movement of the magnet?

North pole in North pole out

(A) N N

(B) N S

(C) S N

(D) S S

Q.14 Which of the following statements is correct about the given circuit diagram?

(A) Potential difference across R is 10 V (B) Potential difference across 20  is 17 V (C) Current through 50  is 0.2 A

(D) Value of resistance R is 20 

Q.15 For the given redox reaction :

Identify x, y, z, p and q.

x y z p q

(A) 8 3 4 oxidation reduction (B) 8 3 4 reduction oxidation (C) 4 8 3 reduction oxidation (D) 3 4 8 oxidation reduction

Q.16 Mrs. Smita, a science teacher has collected samples of four different solutions in glass bottles as shown in the figure :

Which of the following statements about these samples is/are incorrect?

I. Sample IV has H+ ion concentration greater than that in sample I.

II. When equal volumes of solutions III and IV are mixed, the pH of the resulting solution will be 8.

III. Sample I will turn methyl orange indicator yellow while sample III will turn it red.

IV. Concentration of OH– ion increases in the

order, I < III < IV < II.

(A) I and III only (B) I, II and IV only (C) II and IV only (D) None of these

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Q.17 Metals are extracted from their ores by using different methods depending on their positions in the activity series.

Fill in the blanks in the given flowchart by choosing an appropriate option.

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

(A) Calcination Roasting Electrolysis Reduction

(B) Electrolysis Roasting Reduction Calcination

(C) Roasting Reduction Calcination Electrolysis

(D) Electrolysis Calcination Reduction Roasting

Q.18 The molecular formula of an organic compound 'X' is C4H8O. 'X' decolourises

bromine-water and reacts with sodium with the evolution of hydrogen gas. It undergoes following sequence of reactions :

X, Y and Z are respectively

(A) CH3CH=CHCH2OH, CH3(CH2)3OH,

CH3COO(CH2)3CH3 (B) CH3OCH2CH=CH2,CH3OCH2CH2CH3, CH3COO(CH2)3CH3 (C) CH3(CH2)3OH,CH3CH=CHCH2OH, CH3(CH2)3COOCH3 (D) (CH3)2C=CHOH, (CH3)2CHCH2OH, (CH3)2CHCH2COOCH3

Q.19 The positions of four elements P, Q, R and S are shown on the outline of a part of the periodic table.

Which of the following statements about these elements is/are incorrect?

I. Elements Q and S have valencies 2 and 3 respectively.

II. Element P has highest atomic radius while element S had lowest atomic radius.

III. Elements P, Q and R form P2S, QS and

R2S3 type of compounds with element S.

IV. On moving across a period from element P to S, metallic character first decreases and then increases.

(A) I, II and III only (B) II and IV only (C) I, II and IV only (D) All of these

Q.20 Match the column-I with column-II and select the correct option from the given codes.

Column-I Column-II

(Reaction) (Type of reaction)

(p) ZnO + C  Zn + CO (i) Displacement (q) Pb(NO3)2 + 2KI  PbI2 (ii) Combination

+ 2KNO3

(r) Pb + CuCl2  (iii) Decomposition

PbCl2 + Cu

(s) 2KClO3  2KCl + 3O2 (iv) Redox

(t) MgO + H2O  Mg(OH)2 (v) Double

displacement (A) (p)-(iv), (q)-(v), (r)-(iii), (s)-(i), (t)-(ii) (B) (p)-(v), (q)-(iv), (r)-(i), (s)-(iii), (t)-(ii) (C) (p)-(iv), (q)-(v), (r)-(i), (s)-(iii), (t)-(ii) (D) (p)-(iii), (q)-(ii), (r)-(iv), (s)-(i), (t)-(v)

Q.21 The given graph shows the changes in pH of solution 'X' when another solution 'Y' is slowly added to it till in excess. Identify solutions 'X' and 'Y'.

Solution X Solution Y

(A) Nitric acid Potasium hydroxide (B) Water Dilute sulphuric acid

(C) Sodium hydroxide Hydrochloric acid (D) Sodium chloride Acetic acid

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Q.22 Weighed pieces of iron are added to two different solutions P and Q. The results are noted down in the given table.

Solution Initial mass of Iron (in g)

Mass of iron after some time (in g)

P Q 7 4 4 4

The aqueous solutions P and Q are respectively

(A) Copper sulphate, Silver nitrate (B) Copper sulphate, Aluminium sulphate (C) Calcium chloride, Magnesium chloride

(D) Zinc sulphate, Lead sulphate

Q.23 Read the given statements and select the correct option.

Statement-1 : The increasing order of

non-metallic character is Si < B < C < N < F.

Statement-2 : Non-metallic character decreases

along a period and increases down the group. (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

Q.24 The molecular formulae of three compounds P, Q and R are C4H6, C3H8O and C2H4O2

respectively. The relative molecular masses of first member of homologous series of these compounds are respectively -

(A) 26, 32, 46 (B) 28, 46, 60 (C) 54, 60, 60 (D) 26, 32, 42

Q.25 Which of the following reactions are endothermic in nature?

(i) Evaporation of water

(ii) Dissolution of sodium hydroxide in water (iii) Dilution of sulphuric acid

(iv) Dissolution of ammonium chloride in water

(v) Combustion of methane gas (A) (i), (iv) and (v) only B (B) (ii), (iii) and (v) only (C) (i), (ii) and (iv) only D (D) (i) and (iv) only

Q.26 A metal charbonate 'P' reacting with an acid gives a gas which when passed through a solution 'Q' gives the carbonate back. On the other hand, a gas 'R' that is obtained at anode during electrolysis of brine is passed on dry 'Q', it gives a compound 'S' used for disinfecting drinking water. Identify P, Q, R and S.

P Q R S

(A) Na2CO3 NaOH Cl2 NaOCl

(B) CaCO3 Ca(OH)2 Cl2 CaOCl2

(C) CuCO3 Cu(OH)2 CO2 CuO

(D) MgCO3 Mg(OH)2 H2 MgO

Q.27 Four metal pieces W, X, Y and Z are added in different beakers as shown in the given figure.

Observe the amount of H2 gas formed in each

beaker carefully and identify metals W, X, Y and Z. W X Y Z (A) Cu Mg Na Pt (B) Ca Au Zn Mn (C) Ag Pt Al Mg (D) Hg Mn Na Au

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Q.28 The structures of compounds 1 and 2 are -

Which of the following statements about these two compounds is/are correct?

I. Compound 1 undergoes saponification to give sodium salt of second member of homologous series of compound 2 and a new compound 3.

II. Compound 1 and 2 are isomers.

III. Compound 2 gives brisk effervescence on reaction with sodium carbonate. IV. Compounds 1 and 2 can be prepared

from compound 3 in a single step. (A) I, II and III only (B) II and III only (C) IV only (D) All of these

Q.29 Select the option that correctly fills the blanks (i), (ii), (iii) and (iv) in the given passage. ...(i)... plants flower when night length is longer than a critical dark period. Interruption of the dark period by a brief light treatment ...(ii)... flowering in them, ...(iii)... plants flower when they receive photoperiods above the critical length. Interruption of dark period by light ...(iv)... flowering in them.

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

(A) Short day Promotes Long day Prevents (B) Long day Induces Short day Prevents (C) Short day Prevents Long day Promotes (D) Long day Induces Short day Promotes

Q.30 Match column-I with column-II and select the correct option from the codes given.

Column-I Column-II

(a) Abscisic acid (i) Promotes stomatal closure

(b) Gibberelliin (ii) Bolting in rosette plants

(c) Cytokinin (iii) Repening of fruits (d) Ethylene (iv) Cell division and cell

enlargement (A) (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii) (B) (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

(C) (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i) (D) (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)

Q.31 Reading the given statements that Mohit has made during a conversation.

(i) I have s strong feeling of hatred for Sudhir. I just cannot tolerate him.

(ii) I cannot drive properly if I am drunk (iii) I can ride a bicycle in a steady, straight

line

(iv) I speak English but now I have also learnt Spanish.

Refer to the given figure and select the correct match of (i), (ii), (iii) and (iv) with the functionally associated parts of the human brain, labelled as P, Q, R and S.

(A) P – (ii) (B) Q – (iii) (C) S - (i) (D) R – (iv)

Q.32 The element Z belongs to group 14, period 3 of the periodic table. Which statement about the element Z is correct?

(A) Element Z has four electrons. (B) Element Z has four electron shells (C) Element Z is a metal and forms Z2O type

oxide.

(D) Element Z has four electrons in M shell

Q.33 Refer to the given diagram and red the accompanying statements.

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(i) A major amount of carbohydrates is digested in P.

(ii) Q secretes sodium bicarbonate that neutralises the HCl of semi-solid food that comes from stomach.

(iii) Fats are mainly digested in S.

(iv) Enzyme responsible for curdling of milk is present in Q.

Which of the above statements are incorrect? (A) (ii) and (v) only

(B) (i), (iv) and (v) only (C) (iii), (iv) and (v) only

(D) (i), (ii) and (iii) only

Q.34 Refer to the given figure with parts labelled W, X, Y and Z and select incorrect statements regarding this.

(i) A sexually transmitted disease caused by a protozoan Trichomonas causes infection in part Z leading to foul smelling yellow discharge and burning sensation.

(ii) If small portions of both parts labelled W are removed and cut ends are tied then fusion between male and female gametes cannot take place.

(iii) Part labelled Y undergoes cyclic structural changes under the influence of part labelled X.

(iv) Meiosis takes place in the parts labelled W and Y at the time of cleavage in zygote and oogenesis respectively. (v) Diaphragms are birth control devices

which are implanted in Y by doctors or trained nurses.

(A) (i) and (ii) only (B) (iii) and (iv) only (C) (i), (ii) and (iii) only

(D) (iv) and (v) only

Q.35 Given section of a leaf shows the arrangement of cells 1, 2, 3, 4 and 5 inside it. Which of these labelled cells contain chloroplasts?

(A) 1, 2 and 3 only (B) 1, 3 and 4 only (C) 2, 3 and 5 only (D) 2, 3 and 4 only

Q.36 Which of the following matches is/are correct?

Examples Connecting link between

(i) Duck billed Reptiles and

platypus mammals

(ii) Lepidosiren Fish and invertebrates (iii) Peripatus Annelids and

arthropods (iv) Archaeopteryx Birds and reptiles (A) (i) only

(B) (ii) and (iii) only (C) (i), (iii) and (iv) only

(D) (iii) and (iv) only

Q.37 In which of the following conditions fossil 'W' can be considered to have evolved earlier than fossil 'X'?

(i) Fossil 'X' has vestigial structures that are homologous to functional structures in fossil 'W'

(ii) Fossil 'X' is structurally more complex than fossil 'W'

(iii) Fossil 'X' is in better state of preservation than fossil 'W'

(iv) Fossil 'X' is found in lower stratum of undisturbed sedimentary rock than fossil 'W'

(A) (i) and (ii) only (B) (iii) and (iv) only

(C) (i), (ii) and (iii) only (D) (i), (ii), (iii) and (iv)

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Q.38 Which of the following statements is incorrect regarding the reflex are shown in the given figure?

(A) If orientation of neuron Q is made like that of P then the motor organ will not be able to get instructions from spinal cord. (B) If in an accident, P is injured then the

impulse will not be transmitted from receptor to spinal cord

(C) R possesses numerous dendrites and branching axons that make possible the extensive and complex circuits and pathways within spinal cord

(D) None of these

Q.39 Which of the following facts can be best supported by the given diagram?

(A) A human offspring receives 46 chromosomes either from the male parent or from the female parent.

(B) A human offspring gets half of its traits from each parent.

(C) A human offspring can inherit only 46 trains.

(D) A human offspring has 23 dominant traits from one parent and 23 recessive traits from the other parent.

Q.40 Refer to the given diagram of a typical dicotyledonous seed and select the correct option regarding it?

(A) Part L is well laden with nutrients and serves as a food reserve.

(B) The roots seen in a seedling are always formed by part N

(C) Part M houses the cells which form the shoot system of the new plant.

(D) Part M is the first part of a seedling to emerge during the process of germination.

Q.41 In the spotted leopard, coat colour is controlled by a single gene with two alleles, H and h. The black panther is a variety of spotted leopard. The given diagram shows a cross between a spotted leopard and a black panther.

All the offspring in the F1 generation were

spotted leopards. The results of a cross between two animals of the F1 generation are

also shown.

Select the option that correctly identified the genotypes of the original two parents?

Spotted leopard Black panther

(A) HH hh

(B) HH Hh

(C) Hh hh

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Q.42 The given diagram shows a food web. Which of the following options correctly represents (i) pyramid of numbers and (ii) pyramid of energy based on this food web?

(A) (B) (C) (D)

Q.43 Read the following statements.

I. In a food chain, there is a cyclic flow of energy from sun to producers, consumers and then to decomposers which transfer it back to producers by decomposition. II. Some harmful chemicals may enter our

bodies through food chain and get accumulated in our fat tissues as they cannot be metabolised within our bodies. III. When the number of individuals or their

biomass at producer level is minimum and increases progressively at each trophic level in a food chain, an inverted pyramid is formed, e.g., pyramid of biomass in forest ecosystem and pyramid of numbers in pond ecosystem.

IV. If 1000 joules of energy is available at the producer level, then amount of energy present at the level of primary consumers is about 10 joules.

Which of these statements are correct? (A) I and III only

(B) II only

(C) III and IV only (D) I and IV only

Q.44 Glomerular filtration is possible because - (A) Glomerular capillaries have lesser

diameter than afferent aretriole.

(B) Afferent arteriole has lesser diameter than the efferent arteriole

(C) Both the afferent and the efferent arterioles have the same diameter

(D) Glomerular capillaries have more diameter than the efferent arteriole

Q.45 Read the given paragraph where few words have been italicised.

A food chain involves a nutritive interaction between the abiotic components of an ecosystem. There is biodirectional flow of energy from sun to producers and to different types of consumers. Decomposers help in nutrient recycling and enrich the soil with nutrients. There can be maximum 10-12 trophic levels in a food chain. First trophic level is always occupied by a Producer. A herbivore like Grasshopper may occupy second or third trophic level.

Select the correct option regarding this. (A) Abiotic should be replaced with biotic

and bidirectional should be replaced with unidirectional.

(B) 10-12 should be replaced with 14-18 (C) Producer should be replaced with

decomposer and grasshopper should not

be replaced as it is correctly mentioned. (D) Decomposers should be replaced with

parasites.

Q.46 I-V graph of a resistor is shown in the given figure. A student determines the resistance at points E, F and G and states them as RE RF

and RG respectively. His calculation is correct

if -

(A) RE > RF > RG (B) RE < RF > RG

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Direction : Refer to the given paragraph carefully and

answer the questions 47 and 48.

Elements X and Y are both period 3 elements. Element X has three valence electros and element Y has six valence electrons. Element X reacts with element Y to form compound Z.

Q.47 What is the formula of compound Z and the bonding in Z? Formula of Z Bonding in Z (A) XY3 Covalent (B) XY3 Ionic (C) X2Y3 Covalent (D) X2Y3 Ionic

Q.48 If element X belongs to group 13 and element Y belongs to group 16 then the compound Z is -

(A) Al2O3 (B) B2O3

(C) Ga2O3 (D) Al2S3

Q.49 Refer to the given figures and select the correct option regarding the labelled parts.

(A) The parts labelled Z and T functional equivalents.

(B) The parts labelled X and Q produce male and female gametes respectively

(C) The parts labelled W and S are structural equivalents

(D) Development of respective embryos occurs inside parts X and P

Q.50 The graph below shows changes in air-pressure in the lungs of a person during respiration.

Which of the following statements is incorrect regarding this?

(A) The region between P to R indicates exhalation.

(B) The region between R to T indicates inhalation.

(C) At S, the rib cage is downward and inward and shape of the diaphragm is dome shaped.

(D) The distance between P and T will decrease and between H and Q will increase in a person doing vigorous exercise.

Figure

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