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NEET Senior : TARGET NEET-2024
The Leader In Chemistry ..... Physics - Test No. : 18
Work, Energy and Power + Gravitation
+ Mechanical Properties of Solids
Date Time No. Of MCQs Marks
23/02/2024 60 mins. 50 180 (+4, –1)

PHYSICS 5. A 10 kg block moves in a straight line under

Section : A the action of a force that varies with the
position, as shown in the figure. How much
1. A particle is moved from position
work is done by the force as the block moves
 
r1  (3iˆ  2 jˆ  6kˆ ) m to position r2  (14 iˆ  13 jˆ  9kˆ ) m from origin to x = 8 m. [ NCERT Page-119]

under the action of a force F  (4iˆ  jˆ  3kˆ ) N .
The work done is equal to [ NCERT Page-117]
1) 32 J 2) 64 J
3) 96 J 4) 46 J
2. The net work done by the tension when the
1) 20 J 2) 25 J 3) 30 J 4) 0 J
bigger block of mass M touches the ground, as
6. At time t = 0, particle starts moving along the
shown in the figure, is [ NCERT Page-138] x-axis. If its kinetic energy increases uniformly
with time t, the net force acting on it must be
proportional to
1) t 2) t0 3) t 4) 1 / t
7. A ball of mass 500 g falls from a height of 10 m.
If it strikes the ground with the speed of 5 m/s,
then work done by air friction is
[ NCERT Page-116]
1) 43.75 J 2) 50 J 3) 6.25 J 4) 25 J

1) Mgd 2) –(M + m)gd 8. A unidirectional force F  (2x  3 x )iˆ is acting
2

3) –mgd 4) zero on a block, initially at rest, placed on a smooth

3. The velocity-time graph of surface at position x = 0. The minimum kinetic
energy is 4 units. Find the positive numerical
a particle of mass 2 kg, value of constant .
moving in a straight line, 1) 2 2) 1 3) 3 4) 4
is given in figure. The 9. Select the correct alternative(s).
work done by all the forces I) The work done by static friction is not
from t = 0 to t = 2 s on the always zero.
particle is [ NCERT Page-117] II) The work done by static friction is always
non-zero.
1) 400 J 2) –400 J
III) The work done by kinetic friction can also
3) –200 J 4) 200 J be positive.
4. Assertion : Mechanical energy of a particle is IV) The kinetic energy of a system cannot be
conserved if it is acted upon by a conservative increased without applying an external
force only. force on the system. [ NCERT Page-117]
Reason : Work done by a conservative force in 1) I and III only 2) I, III and IV only
3) II and IV only 4) I and II
a closed path is zero. [ NCERT Page-121]
10. Potential energy U of a particle in a conservative
1) If both assertion and reason are true and
 2 4
reason is the correct explanation of assertion. field is given by the expression U   2   J .
x x
2) If both assertion and reason are true, but reason
The acceleration of the particle of mass 2 kg at
is not the correct explanation of assertion.
position x = 1 m is [ NCERT Page-121]
3) If assertion is true, but reason is false. 1) zero 2) 4 m/s2
2
4) If assertion is false, but reason is true. 3) 1 m/s 4) 2 m/s2
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11. The potential energy of a system increases if 17. The earth takes time T to complete one revolution
work is done [ NCERT Page-120] around the sun. If the distance between the sun
1) upon the system by a non-conservative force and the earth is r, assuming the orbit of the earth
2) by the system against a conservative force around the sun to be circular, the mass of the
3) by the system against a non-conservative force sun is proportional to [ NCERT Page-184]
4) upon the system by a conservative force
r2 r3 r3 r2
12. The spring shown in the 1) 2) 3) 4)
figure is compressed T2 T3 T2 T
initially and then 18. Which of the following statements is correct
released. If a mass of regarding universal gravitational constant G?
2 kg moves with an acceleration of 10 m/s2, then [ NCERT Page-189]
the magnitude of acceleration of mass 5 kg is 1) G has the same value in all systems of units
1) 10 m/s2 2) 0 m/s2 2) Value of G depends upon the nature of the
3) 4 m/s2 4) 5 m/s2 medium between the two bodies
13. If power P of a force varies with position (x) 3) Value of G is same everywhere in the universe
as P  x 1 / 4 , then the force F varies with x as 4) G is a dimensionless constant
19. The mass of the moon is very small compared
[ NCERT Page-125]
to the mass of the earth. Compared to the
1) F  x 2) F  x 2 gravitational force that earth exerts on the moon,
the force exerted by the moon on the earth
1 1
3) F  4) F  1) is the same [ NCERT Page-187]
x x2 2) is smaller
14. Match the following. The potential energy for 3) is greater
a conservative system is given by U = ax2 – bx. 4) depends on the medium between them
[ NCERT Page-121] 20. If earth loses its gravity, then for an object
[ NCERT Page-190]
Column-I Column-II 1) weight becomes zero but not the mass
The net force acting on the 2) mass becomes zero but not the weight
a. i. b / 2a
system 3) mass as well as weight become zero
4) neither mass nor weight become zero
b. The equilibrium position ii. b ─ 2ax 21. At what height from the ground will the value
of g be the same as that in 10 km deep mine
The potential energy at the 2 below the surface of earth? [ NCERT Page-191]
c. iii. ─b / 4a
equilibrium position 1) 20 km 2) 10 km
d. The system is iv. stable 3) 15 km 4) 5 km
22. Which of the following graphs represents the
1) a-iii, b-iv, c-ii, d-i 2) a-iv, b-iii, c-iii, d-i variation of gravitational field E with distance
3) a-ii, b-i, c-iii, d-iv 4) a-ii, b-iii, c-i, d-ii r from centre of uniform hollow spherical shell
15. Water falls from a height of 60 m at the rate of of mass M and radius R?
15 kg/s to operate a turbine. The losses due to
frictional force are 10% of the input energy.
How much power is generated by the turbine? 1) 2)
(g = 10 m/s2) [ NCERT Page-128]
1) 10.2 kW 2) 8.1 kW
3) 12.3 kW 4) 7.0 kW 3) 4)
16. A planet of mass m is moving in an elliptical
orbit about the sun with time period T. If A be 23. In order to shift a body of mass m from a circular
the area of the orbit, then its angular orbit of radius 3R to a higher radius 5R around
momentum would be [ NCERT Page-184] the earth, the work done is [ NCERT Page-192]
2mA 3GMm 2 GMm
1) 2) mAT 1) 2)
T 5R 15 R
mA GMm GMm
3) 4) 2mAT 3) 4)
2T 2R 5R
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24. There is no atmosphere on the moon because 31. The stress versus strain
[ NCERT Page-193] graphs for wires of two
1)it is closer to the earth materials A and B are as
2)it revolves around the earth shown in the figure. If
3)it gets light from the earth Y A and Y B are the
4)the escape velocity of gas molecules is lesser Young’s modulus of the
than their rms velocity there materials, then [ NCERT Page-238]
25. A satellite is orbiting the earth. If its kinetic 1) YB = 2YA 2) YA = YB
energy is doubled, then it will [ NCERT Page-196] 3) YB = 3YA 4) YA = 3YB
1) fall on the earth 32. The stress–strain graph for materials A and B
2) rotate with greater speed are shown in the figure. Graphs are draw to
3) maintain its path the same scale. Which of the two is the stronger
4) escape out of earth’s gravitational field material? [ NCERT Page-238]
26. The satellite of mass m revolving in a circular
orbit of radius r around the earth has kinetic
energy E. Its angular momentum will be
E E
1) 2)
mr 2 2 mr 2
1) A 2) B
3) 2Emr 2 4) 2Emr 3) Both are equally strong
27. The kinetic energies of a planet in an elliptical 4) None of these
orbit about the Sun, at positions A, B and C 33. A ball falling in a lake of depth 200 m shows
are KA, KB and KC, respectively. AC is the major 0.1% decrease in its volume at the bottom.
axis and SB (SB > AS) is perpendicular to AC at What is the bulk modulus of elasticity of the
the position of the Sun in the figure. Then material of the ball? [ NCERT Page-243]
1) 19.6 × 108 N/m2 2) 19.6 × 10–10 N/m2
3) 19.6 × 1010 N/m2 4) 19.6 × 10–8 N/m2
34. The graph shows the
[ NCERT Page-184]
extension of a wire
of length 1 m
1) KB > KA > KC 2) KA < KB < KC suspended from the
3) KB < KA < KC 4) KA > KB > KC top of a roof at one
28. The teacher allows all the students of a class end and with a load
to perform the experiment to determine the W connected to the
Young’s modulus of elasticity with the same other end. If the cross-sectional area of the wire
experimental wire. It does not give correct is 1 mm2, then the Young’s modulus of the
result to the last student because of material of the wire is [ NCERT Page-238]
1) Elastic limit 2) Elastic fatigue 1) 2 × 1011 N m–2 2) 2 × 1010 N m–2
3) Plasticity 4) Permanent set
1 11 2
29. Two bodies of mass m and 9m are placed at a 3)  10 N m 4) 4 × 1010 N m–2
distance R. The gravitational potential on the 2
line joining the bodies where the gravitational 35. The area under load extension graph of a wire
field equals zero, will be (G = gravitational obtained by Searle’s apparatus gives
1) The work done 2) The pressure
constant) [ NCERT Page-192]
3) The momentum 4) The heat energy
12Gm 16Gm 20Gm 8Gm Section : B
1)  2)  3)  4) 
R R R R 36. The device which measures the extension of
30. Two wires of the same material have lengths wire in Searle’s apparatus for Young’s modulus
in the ratio 1 : 2, and their radii are in the ratio of elasticity is
1) Vernier callipers 2) Screw gauge
1 : 2 . If they are stretched by applying equal 3) Sphereometer 4) Metre scale
forces, the increase in their lengths will be in 37. A 2 m long rod of radius 1 cm, which is fixed
the ratio [ NCERT Page-240] from one end, is given a twist of 0.8 radians.
1) 2 : 2 2) 2 :2 The shear strain developed will be
3) 1 : 1 4) 1 : 2 1) 0.002 2) 0.004
3) 0.008 4) 0.016
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38. If the ratio of lengths, radii, 46. A car of mass m is accelerating
and Young’s moduli of steel on a smooth level road under
and brass wires in the figure a single force F. The power
are a, b and c, respectively, delivered to the car is constant
then the corresponding ratio and equal to P. If the car’s velocity at an instant
of increase in their lengths is v, then after travelling how much distance, it
is [ NCERT Page-248] gets doubled? [ NCERT Page-125]
5a 5a 4a 3a 7 mv 2 4 mv3 mv3 18 mv 3
1) 2 2) 2 3) 2 4) 1) 2) 3) 4)
2b c 3b c 3b c 2b2 c 3P 3P P 7P
39. If the spinning speed of the earth is increased, 47. In given figure, ball A is released
then the weight of the body at the equator from rest when the spring is at its
[ NCERT Page-190] natural (unstretched) length. For
1) does not change 2) get doubled the block B of mass M to leave
3) decreases 4) increases contact with the ground at some
40. A rocket is projected in the vertically upward stage, the minimum mass of A
direction with a velocity kve where ve is escape must be [ NCERT Page-123]
velocity and k < 1. The distance from the centre 1) 2 M
of earth upto which the rocket will reach is 2) M
[ NCERT Page-193] 3) M / 2
2
(1  k ) Re 4) a function of M and the force constant of spring
1) Re(1 – k2) 2) 3) Re (1  k 2 ) 4) 48. The potential energy of a particle in a force
Re (1  k 2 )
A B
41. A body is launched with a velocity less than field is given by U  2  , where A and B
the escape velocity. The sum of its kinetic energy r r
and potential energy is [ NCERT Page-196]
are positive constants and r is the distance
of the particle from the centre of the field.
1) zero 2) negative 3) positive
For stable equilibrium, the distance of the
4) may be positive, zero or negative
42. Suppose the gravitational force varies particle is [ NCERT Page-121]
inversely proportional to the nth power of the 1) A / B 2) B / A
distance. The time period of a planet in circular 3) B / 2A 4) 2A / B
orbit of radius R around the sun will be 49. A particle of mass m
proportional to [ NCERT Page-194]
moving along a
straight line
1) Rn 2) R(n + 1)/2 3) R(n – 1)/2 4) R–n
experiences a force F,
43. The apparent weight of any object is
which varies with the
[ NCERT Page-191]
distance travelled, as
1) zero at the centre of the earth
shown in figure. If
2) same at all points on the surface of the earth
3) more on equator than on poles 2F0 x 0
4) double of its value at an altitude equal to the the velocity of the particle at x0 is , then
m
radius of the earth the velocity at 4x0 is [ NCERT Page-119]
44. Four particles, each of mass M, move along a
circle of radius R under the action of their 2 F0 x0 F0 x0
1) 2 2) 2
mutual gravitational attraction. The speed of m m
each particle is
F0 x0
GM GM 3) 4) None of these
1) 2) 2 2 m
R R 50. A small block of mass m is kept on a rough
GM  2 2  1  inclined surface with inclination angle , fixed
GM  
3) (2 2  1) 4) in an elevator. The elevator goes down with a
R R  4 
 uniform velocity v, and the block does not slide
45. If the distance betwen the earth and the sun on the wedge. The work done by the force of
were half of its present value, then number of friction on the block in time t will be
days in a year would have been approximately [ NCERT Page-125]
[ NCERT Page-195] 1) –mgvt 2) mgvt
1) 64.5 2) 129 3) 182.5 4) 730 3) –mgvt sin2 4) –mgvt cos2
Vijaypath Test Series : Round-I 4