CLASS 11 PHYSICS QUESTION PAPER 1
CLASS – XI
(SECTION-A)
1. The force that appears between elementary particles in a nuclear process is:
(a) Gravitational force (b) Weak nuclear force
(c) Electromagnetic force (d) Strong nuclear force
2. Find the sum of masses 436.32 g, 227.2 g and 0.301 g in correct significant
figures.
(a) 663.821 g (b) 663.82 g
(c) 663.8 g (d) 663g
3. Out of the following, which is not a vector quantity?
(a) Pressure (b) Linear momentum
(c) Force (d) Torque
4. A gravitational force acts between two objects placed some distance apart.
If the distance between them is reduced to half, then the new force will
become:
(a) two times (b) four times
(c) one-half (d) one-fourth
5. A coolie moves 10 m on a straight horizontal road with a load of 80 kg on
his head. The work done by the gravitational force is:
(a) positive (b) negative
(c) zero (d) none of the above
6. The dimensional formula of ω in the relation x = A sin ωt is:
(a) [M°L°T] (b) [M°L°T-¹]
(c) [M°LT-¹] (d) [M°LT]
7. The number of significant in 0.006302 m² is :
(a) 3 (b) 4 (c) 6 (d) 7
8. A physical quantity P is related to four observables a, b, c and d as follows:
(a) 10% (b) 13% (c) 5% (d) 6%
9. A bullet of mass 0.04 kg moving with a speed of 90 m/s enters a heavy
wooden block and is stopped after a distance of 60 cm. What is the average
resistive force exerted by the block on the bullet?
(a) 0.27 N (b) 2.7 N
(c) 27 N (d) 270 N
10. If x represents distance and y represents magnitude of displacement in a
motion then x/y:
(a) is always greater than 1
(b) is always less than 1
(c) may be greater than or equal to (1)
(d) may be less than or equal to 1
11. A car moving with a speed of 20 m/s takes a u-turn in 5 seconds, without
changing its speed. The magnitude of average acceleration during these 5
seconds is:
(a) 4 m/s² (b) 8 m/s²
(c) 10 m/s² (d) zero
12. A stone tied to the end of a string 80 cm long is whirled in a horizontal
circle with a constant speed. If the stone makes 14 revolutions in 25
seconds, what is the magnitude of acceleration of the stone?
(a) 0.099 m/s² (b) 0.99 m/s²
(c) 9.9 m/s² (d) 99 m/s²
13. If two forces of 5 N each are acting along X-axis and Y-axis, then the magnitude of the resultant force is :
(a) 10 N (b) 25 N
(c) 10√2N (d) 5√2N
14. A constant retarding force of 50 N is applied to a body of mass 20 kg
moving initially with a speed of 15 m/s. How long does the body take to
stop?
(a) 6s (b) 5s (c) 3s (d) 2s
15. There are two bodies of masses 4 kg and 100 kg separated by 1m. At what
distance from the smaller body, the intensity of gravitational field will be
zero?
(a) 1/6 m (b) 5/6 m
(c) 1/11 m (d) 10/11 m
16. A man weights 63 N on the surface of earth. What is the gravitational force
on it due to the earth at a height equal to half the radius of the earth?
(a) 56 N (b) 42 N (c) 28 N (d) 14 N
17. The displacement of particle moving in straight line is given by
x = 2t² + 2t + 5, where x is expressed in meters and t in seconds. The
acceleration at t = 2s is :
(a) 4 m/s² (b) 8 m/s²
(c) 10 m/s² (d) 12 m/s²
18. Two bodies have their moments of inertia 1 and 41 respectively about
their axis of rotation. If their kinetic energies of rotation are equal, their
angular velocities will be in the ratio:
(a) 1:2 (b) 1:4 (c) 2:1 (d) 4:1
(Section-B)
19. A car travels firs half of the distance two places with a speed of 40 km/h
And the remaining half with a speed of 60 km/h. The average speed of the
car is:
(a) 50 km/h (b) 48 km/h
(c) 45 km/h (d) 55 km/h
20. A flywheel of mass 1000 kg and radius 1 m is rotating at the rate of 420
rpm. The wheel stops in 14 revolutions, find the angular acceleration,
assuming mass to be concentrated at the rim of the wheel.
(a) 11 rad/s² (b) 22 rad/s²
(c) -11 rad/s² (d) -22 rad/s²
21. If a constant torque of 500 Nm turns a wheel of moment of inertia 100 kg
m² about an axis through its centre, find the gain in angular velocity in 3
s.
(a) 15 rad/s (b) 30 rad/s
(c) 10 rad/s (d) 45 rad/s
22. The escape velocity from earth is about 11.2 km/s. The escape velocity
for another planet, whose mass is 1000 times that of the earth and
diameter is 10 times that of the earth, will be:
(a) 1.12 km/s (b) 11.2 km/s
(c) 112 km/s (d) 1120 km/s
23. The radii of circular orbits of two satellites A and B of the earth are 4R
and R, respectively. If the speed of satellite A is v, then the speed of
satellite B will be:
(a) v (b) 2v (c) v/2 (d) √2v
24. In a ballistic demonstration a police officer fires a bullet of mass 50 g with
speed 200 m/s on soft plywood of thickness 2 cm. The bullet emerges
with only 10% of its initial kinetic energy, what is the emergent kinetic
energy of the bullet from the plywood?
(a) 100 J (b) 1000 J
(c) 2000 J (d) 200 J
25. The square of resultant of two forces equal in magnitude is three times
the product of their magnitudes. The angle between the force is:
(a) 180° (b) 90°
(c) 45° (d) 60°
26. Two bullets are fired simultaneously, horizontally and with different
Speeds from the same height. Which bullet will hit the ground first?
(a) The faster one
(b) The slower one
(c) Depends on their masses
(d) Both will reach simultaneously
27. Calculate the impulse necessary to stop a 1000kg car travelling at
90 km/h.
(a) 250000 Ns (b) 90000 Ns
(c) -25000 Ns (d) -90000 Ns
28. Assertion (A): If the ice on the polar caps of the earth melts, then length
Of the day will increase.
Reason (R): Moment of inertia of the earth increases, as ice on polar
Caps melts.
29. Assertion (A): An astronaut experiences weightlessness in a space
satellite.
Reason (R): When a body falls freely, it does not experience gravity.
30. Assertion (A): When a ball collides elasticity with a floor, it rebounds
With the same speed as with it strikes.
Reason (R): Kinetic energy of the system remains conserved in elastic
collision.
31. Find the scalar product of two vectors, a=(3î-4ĵ+5k) and b=(-2î+ĵ-3k).
(a) 25 (b) 25 (c) -25 (d) -18
32. If the radii of circular paths of two particles of equal masses are in the ratio 1:2, then to have a constant centripetal force, their velocities should be in the ratio:
(a) 2:1 (b) √2:1 (c) 1:2 (d) 1:√2
(Case Study)
33. If x is the kinetic energy before collision and y be the kinetic energy after
collision then in inelastic collision:
(a) x > y (b) x < y (c) x = y (d) none of the above
34. In elastic collision:
(a) Total kinetic energy is conserved
(b) Total linear momentum is conserved
(c) Total energy is conserved
(d) All of the above
35. In inelastic collision:
(a) Total kinetic energy is conserved
(b) Total linear momentum is conserved
(c) Total energy is conserved
(d) Both total energy and total linear momentum are conserved
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