NSTSE Sample Paper Class 11 PCB

Class : 11_PCB Biology
1. Lepidopterology deals with the study of
(A) bugs and bees.
(B) moths and butterflies.
(C) grasshopper and crickets.
(D) dragonflies and damselflies.
2. Tapetum occurs in the jacket layer of
(A) Leptosporangiate sporangia
(B) Eusporangiate sporangia
(C) All homosporous sporangia
(D) All heterosporous sporangia
3. Phagocytosis may be characterized by which of the
following statements ?
(A) It is a constitutive process
(B) It involves fluid uptake by small vesicles
(C) It is important in digestive processes in mammals
(D) It involves the uptake of cellular debris in large
endocytic vesicles
4. Carbohydrates, lipids and proteins are formed from
their basic building blocks by
(A) addition of carbon to each molecule.
(B) addition of oxygen to each molecule.
(C) removal of a water molecule between building blocks
(D) addition of a water molecule between building blocks

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5. Which of the following statements regarding brown
fat is correct ?
(A) It is poorly vascularized
(B) It functions in unilocular energy storage
(C) It is directly innervated by the parasympathetic
(D) It produces heat through the uncoupling of the electron
transport chain from oxidative phosphorylation

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Class : 11_PCB Physics
6. An iron ball is dropped into a long jar containing
castor oil. How will it move ?
(A) It will fall with a constant acceleration equal to that
of gravity.
(B) It will fall with an acceleration slightly less than that
due to gravity.
(C) It will ultimately acquire a constant velocity.
(D) It will float in the oil.
7. A soap bubble assumes a spherical shape. Which of
the following statements is wrong ?
(A) The soap film tends to shrink to as small surface area
as possible.
(B) The soap film consists of two surface layers.
(C) Pressure of air enclosed by the soap film is same as
that of the atmosphere outside.
(D) Pressure of air enclosed by the soap film is more than
the atmospheric pressure.
8. A ball hits the floor and rebounds after an inelastic
collision. What happens in this case ?
(A) The momentum of the ball just after the collision is
the same as that just before the collision.
(B) The mechanical energy of the ball remains the same
in the collision.
(C) The total momentum of the ball and the earth is
conserved.
(D) The total energy of the ball and the earth is conserved.

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9. A small sphere is suspended by a string from the ceiling
of a car. If the car begins to move with a constant
acceleration a, then what is the inclination of the string
to the vertical ?
(A) tan–1 (a/g) in the direction of motion.
(B) tan–1 (a/g) opposite to the direction of motion.
(C) tan–1 (g/a) in the direction of motion.
(D) tan–1 (g/a) opposite to the direction of motion.
10. Viscous force is somewhat like friction as it opposes
the motion and is non-conservative but not exactly
so, Why ?
(A) It is velocity dependent while friction is not.
(B) It’s velocity decreases and becomes zero.
(C) It is temperature independent while friction is not.
(D) It is independent of area like surface tension while
friction depends on the area of contact.

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Class : 11_PCB Chemistry

11. What are the favourable conditions for the
manufacture of ammonia by the reaction N2(g) + 3H2(g)
2NH3(g) ; H = –21.8 kcal mol–1 ?
i) Low temperature ii) Catalyst
iii) High pressure
(A) (i) and (ii) only (B) (ii) and (iii) only
(C) (i) and (iii) only (D) (i), (ii) and (iii)
12. Which of the following can be used to prepare a
buffer solution ?

(I) From a mixture of sodium acetate and acetic acid
in water.
(II) From a mixture of sodium acetate and hydrochloric
acid in water.
(III) From a mixture of ammonia and ammonium
chloride in water.

(A) (I) and (II) only (B) (II) and (III) only
(C) (I) and (III) only (D) (I), (II) and (III)
13. What is the purpose of exhaust system in limekilns
where the decomposition of limestone takes place ?
(A) To drive away, CO2 gas and make the reaction proceed
for completion.
(B) To reduce the temperature of the reaction.
(C) To make the reaction attain equilibrium in less time.
(D) All of the above

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14. Why can H2S in presence of dilute HCl precipitate out
only second group radicals but not fourth group
radicals ?
(A) HCl activates H2S.
(B) HCl decreases concentration of sulphide ions.
(C) HCl increases concentration of sulphide ions.
(D) Sulphides of IV group are unstable in HCl.
15. Which of the following electronic configurations
represents the violation of both Aufbau principle and
Hund’s rule ?

(A)
3s 3p 3d 4s

(B)
3s 3p 3d

(C)
3s 3p 3d

(D)
3s 3p 3d 4s

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Class : 11_PCB Critical Thinking
16. Recognize the tool in the question and choose the
most closely related tool or object from the given
choices.

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

17. The hidden figure in block 10 is ______.

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

18. Count the number of blocks in the given figure.

(A) 105 (B) 98 (C) 102 (D) 100

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19. Recognize the tool in the question and choose the
most closely related tool or object from the given
choices.

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

20. Of these four choices, three are the correct two-
dimensional views that would represent the top, front
and side. The fourth is incorrect. Identify the response
that would be INCORRECT.

(A) (B)

(C) (D)

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