NEET RANCHI

बुद्धा साइन्स एंड टेक्निकल इंस्टीट्यूट
Buddha Science & Technical Institute
Kokar, Ranchi, Jharkhand
JOIN BSTI FOR : IIT-JEE / NEET With BHARAT SIR
PHYSICS : IMPORTANT QUESTION FOR IIT-JEE / NEET
Q. A particle moves along the x-axis from x = 0 to x = 5 m under the
influence of a force given by F = 7 – 2x + 3x2 . Work done in the
process is
A. 70
B. 270
C. 35
D. 135
ANS : D
V.V.I.
QUESTION

Q. The work done by pseudo forces is
A. Positive
B. Negative
C. Zero
D. All of these
ANS : D
V.V.I.
QUESTION

Q. The work done by a spring force
A. Is always negative
B. Is always positive
C. Is always zero
D. May be positive and negative
ANS : D
V.V.I.
QUESTION

Q. A ball is released from the top of a tower. The ratio of work done
by force of gravity in first, second and third second of the motion
of ball is
A. 1 : 2 : 3 B. 1 : 4 :16
C. 1 : 3 : 5 D. 1 : 9 : 25
ANS : C
V.V.I.
QUESTION

Q. A position dependent force, F = 7 – 2x + 3x2 N acts on a small body
of mass 2 kg and displaces it from x = 0 to x = 5 m. The work done
in joule is
A. 35 B. 70
C. 135 D. 270
ANS : C
V.V.I.
QUESTION

Q. Mark out the correct statement (s).
A. Total work done by internal forces on a system is always zero
B. Total work done by internal forces on a system may sometimes be zero
C. Total work done by friction may sometimes be zero
D. Total work done by friction is always zero
ANS : B, C
V.V.I.
QUESTION

Q. If the speed of a vehicle increase by 2 m/s, its kinetic energy is
doubled, then original speed of the vehicle is
A. (√2 + 1) m/s
B. 2(√2 - 1) m/s
C. 2(√2 + 1) m/s
D. √2(√2 +1) m/s
ANS : C
V.V.I.
QUESTION

Q. Unit of power is
A. Kilowatt hour
B. Kilowatt per hour
C. Kilowatt
D. Erg
ANS : C
V.V.I.
QUESTION

Q. When work done by force of gravity is negative
A. PE increase
B. KE decreases
C. PE remains constant
D. PE decreases
ANS : A
V.V.I.
QUESTION

Q. A long spring is stretched by 2 cm. Its potential energy is U. If the
spring is stretched by 10 cm, its potential energy would be
A. U / 25
B. U / 5
C. 5U
D. 25U
ANS : D
V.V.I.
QUESTION

Q. An engine develops 10 kW of power. How much time will it take to
lift a mass of 200 kg to a height of 40 m (g = 10 ms-2)
A. 4 s
B. 5 s
C. 8 s
D. 10 s
ANS : C
V.V.I.
QUESTION

Q. A vehicle needs an engine of 7500 W to keep it moving with a
constant velocity of 20 m/s on a horizontal surface. The force
resisting the motion is
A. 375 dyne B. 375 N
C. 150000 dyne D. 150000 N
ANS : D
V.V.I.
QUESTION

Q. A box is moved along a straight line by a machine delivering
constant power. The distance moved by the body in time t is
proportional to
A. t 1/2 B. t3/4
C. t3/2 D. t2
ANS : C
V.V.I.
QUESTION

Q. In which of the following cases the potential energy is defined
A. Both conservative and non-conservative forces
B. Conservative force only
C. Non-conservative force only
D. Neither conservative nor-conservative forces
ANS : B
V.V.I.
QUESTION

Q. A 50 kg girl is swinging on a swing from rest. Then, the power
delivered when moving with a velocity of 2 m/s upwards in a
direction making an angle 60˚ with the verticle is
A. 980 W B. 490 W
C. 490√3 W D. 245 W
ANS : C
V.V.I.
QUESTION

Q. A particle moves in a straight line with retardation proportional to
its displacement. Its loss of kinetic energy for any displacement x is
proportional to
A. x B. x2
C. In x D. ex
ANS : B
V.V.I.
QUESTION

Q. A body of mass 5 kg is raised vertically to a height of 10 m by a
force 170 N. The velocity of the body at this height will be
A. 9.8 m/s
B. 15 m/s
C. 22 m/s
D. 37 m/s
ANS : C
V.V.I.
QUESTION

Q. A body is moved along a straight line with constant power. The
distance moved by the body in time t is proportional to
A. t3/4
B. t3/2
C. t1/4
D. t1/2
ANS : B
V.V.I.
QUESTION

Q. A body of mass 0.1 kg moving with a velocity of 10 m/s hits a
spring (fixed at the other end) of force constant 1000 N/m and
comes to rest after compressing the spring. The compression of the
spring is
A. 0.01 m B. 0.1 m
C. 0.2 m D. 0.5 m
ANS : B
V.V.I.
QUESTION

Q. A mass of 2 kg falls from a height of 40 cm on a spring with a force
constant of 1960 N/m. The spring is compressed by (take g = 9.8
m/s2)
A. 10 cm B. 1.0 cm
C. 20cm D. 5 cm
ANS : A
V.V.I.
QUESTION

Q. If v be the instantaneous velocity of the body dropped from the top
of a tower, when it is located at height h, then which of the
following remains constant ?
A. gh + v2 B. gh + v2 / 2
C. gh - v2 / 2 D. gh - v2
ANS : B
V.V.I.
QUESTION

Q. The net work done by kinetic friction
A. Is always negative
B. Is always zero
C. May be negative and positive
D. Is always positive
ANS : C
V.V.I.
QUESTION

Q. A horizontal force F pulls a 20 kg box at a constant speed along a
rough horizontal floor. The coefficient of friction between the box
and the floor is 0.25. The work done by force F on the block in
displacing it by 2 m is
A. 49 J B. 98 J
C. 147 J D. 196 J
ANS : B
V.V.I.
QUESTION

Q. A block of mass 1 kg slides down a rough inclined plane of
inclination 60˚ starting from its top. If coefficient of kinetic friction
is 0.5 and length of the plane d = 1 m then work done against
friction is
A. 2.45 J B. 4.9 J
C. 9.8 J D. 19.6 J
ANS : A
V.V.I.
QUESTION

Q. If the linear momentum is increased by 50%, then kinetic energy
will be increased by
A. 50 %
B. 100 %
C. 125 %
D. 25 %
ANS : C
V.V.I.
QUESTION

Q. A rod of mass m and length l is lying on a horizontal table. Work
done in making it stand on one end will be
A. mgl
B. mgl / 2
C. mgl / 4
D. 2 mgl
ANS : B
V.V.I.
QUESTION

Q. Two masses of 1 g and 4 g are moving with equal kinetic energies.
The ratio of the magnitudes of their momenta is
A. 4 : 1
B. √2 : 1
C. 1 : 2
D. 1 : 16
ANS : C
V.V.I.
QUESTION

Q. The energy required to accelerate a car from rest to 10 ms is W.
The energy required to accelerate the car from 10 ms-1 to 20 ms-1 is
A. W
B. 2 W
C. 3 W
D. 4 W
ANS : C
V.V.I.
QUESTION

Q. The momentum of a body is P and its kinetic energy is E. Its
momentum becomes 2P. Its kinetic energy will be
A. E / 2
B. 3 E
C. 2 E
D. 4 E
ANS : D
V.V.I.
QUESTION

Q. Kinetic energy of a particle moving in a straight line varies with
time t as K = 4t2 . The force acting on the particle
A. Is constant
B. Is increasing
C. Is decreasing
D. First increases and then decreases
ANS : A
V.V.I.
QUESTION

Q. A car moving with a speed of 40 km/h can be stopped by applying
brakes at least 2m. If the car is moving with a speed of 80 km/h the
minimum stopping distance is
A. 8 m B. 2 m
C. 4 m D. 6 m
ANS : A
V.V.I.
QUESTION

Q. A gardener pushes a lawn roller through a distance 20 m. If he
applies a force of 20 kg-wt in a direction inclined at 60˚ to the
ground, the work done by him is
A. 1960 J B. 196 J
C. 1.96 J D. 196 kJ
ANS : C
V.V.I.
QUESTION

Q. The potential energy of a system increase if work is done
A. By the system against a conservative force
B. By the system against a non-conservative force
C. Upon the system by a conservative force
D. Upon the system by s non-conservative force
ANS : A
V.V.I.
QUESTION

Q. Two bodies of masses 4 kg and 5 kg are moving with equal
momentum. Then, the ratio of their respective kinetic energies is
A. 4 : 5
B. 2 : 1
C. 1 : 3
D. 5 : 4
ANS : D
V.V.I.
QUESTION

Q. A body of mass 10 kg moves with a velocity v of 2 ms-1 along a
circular path of radius 8 m . The power produced by the body will
be
A. 10 Js-1 B. 98 Js-1
C. 49 Js-1 D. Zero
ANS : D
V.V.I.
QUESTION

Q. A car of mass 1000 kg accelerates uniformly from rest to a velocity
of 54 km/h in 5 s. The average power of the engine during this
period in watt is (neglect friction).
A. 2000 W B. 22500 W
C. 5000 W D. 2250 W
ANS : D
V.V.I.
QUESTION

Q. A quarter horse power motor runs at a speed of 600 rpm.
Assuming 40% efficiency, the work done by the motor in one
rotation will be
A. 7.46 J B. 7400 J
C. 7.46 erg D. 74.6 J
ANS : A
V.V.I.
QUESTION

Q. According to the work-energy theorem, the work done by the net
force on a particle is equal to the change in its
A. Kinetic energy
B. Potential energy
C. Linear momentum
D. Angular momentum
ANS : A
V.V.I.
QUESTION

Q. A particle of mass m at rest is acted upon by a force P for a time t.
Its kinetic energy after an interval t is
A. P2 t2 / m
B. P2 t2 / 2m
C. P2 t2 / 3m
D. P t / 2m
ANS : B
V.V.I.
QUESTION

Q. If the linear momentum of a body is increased by 50 %, then the
kinetic energy of that body increases by
A. 100%
B. 125%
C. 225%
D. 25%
ANS : B
V.V.I.
QUESTION

NEET RANCHI

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