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. Ten coins are placed on top of each other on a horizontal table. If
the mass of each coin is 10 g and acceleration due to gravity is 10
ms-2, what is the magnitude and direction of the force on the 7th
coin (counted from the bottom) due to all the coins above it ?
A. 0.3 N downwards B. 0.3 N upwards
C. 0.7 N downwards D. 0.7 N upwards
ANS : A
V.V.I.
QUESTION

Q. An object is resting at the bottom of two strings which are inclined
at an angle of 120˚ with each other. Each string can withstand a
tension of 20 N. The maximum weight of the object that can be
sustained without breaking the strings is
A. 10 N B. 20 N
C. 20√2 N D. 40 N
ANS : B
V.V.I.
QUESTION

Q. Four forces act on a point object. The object will be in equilibrium,
if
A. All of them are in the same plane
B. They are opposite to each other in pairs
C. The sum of x, y and z components of forces is zero separately
D. They form a closed figure of 4 sides when added as per polygon law
ANS : A, C, D
V.V.I.
QUESTION

Q. A mass is hanging on a spring balance which is kept in a lift. The
lift ascends with increasing speed. The spring balance will show in
its reading
A. Increase B. Decrease
C. No change D. Change will depend upon velocity
ANS : A
V.V.I.
QUESTION

Q. Consider an elevator moving downwards with an acceleration a,
the force exerted by a passenger of mass m on the floor of the
elevator is
A. ma B. ma – mg
C. mg – ma D. mg + ma
ANS : C
V.V.I.
QUESTION

Q. A force of 50 N is required to push a car on a level road with
constant speed of 10 ms-1 . The mass of the car is 500 kg. What
forces should be applied to make the car accelerate at 1 ms-2 .
A. 450 N B. 500 N
C. 550 N D. 2500 N
ANS : C
V.V.I.
QUESTION

Q. Starting from rest, a body slides down a 45˚ inclined plane in twice
the time it takes to slide down the same distance in the absence of
friction. The coefficient of friction between the body and the
inclined plane is
A. 0.2 B. 0.25
C. 0.75 D. 0.5
ANS : C
V.V.I.
QUESTION

Q. A car having a mass of 1000 kg is moving at a speed of 30 m/s.
Brakes are applied to bring the car to rest. If the friction force
between the tyres and the road surface is 5000 N, the car will come
to rest in
A. 5 s B. 10 s
C. 12 s D. 6 s
ANS : D
V.V.I.
QUESTION

Q. A body is projected along a rough horizontal surface with a velocity
6 m/s. If the body comes to rest after travelling 9 m, then coefficient
of sliding friction, is (g = 10 m/s2)
A. 0.5 B. 0.4
C. 0.6 D. 0.2
ANS : D
V.V.I.
QUESTION

Q. The coefficient of friction between the tyres and road is 0.4. The
minimum distance covered before attaining a speed of 8 ms-1
starting from rest is nearly (g = 10 m/s2)
A. 8.0 m B. 4.0 m
C. 10.0 m D. 16.0 m
ANS : A
V.V.I.
QUESTION

Q. A 13 m ladder is placed against a smooth vertical wall with its lower
end 5m from the wall. What should be the minimum coefficient of
friction between ladder and floor so that it remains in equilibrium
A. 0.36 B. 0.72
C. 0.21 D. 0.52
ANS : C
V.V.I.
QUESTION

Q. A ball of mass 0.5 kg moving with a velocity of 2 m/s strikes a wall
normally and bounces back with the same speed. If the time of
contact between the ball and the wall is one millisecond, the
average force exerted by the wall on the ball is
A. 2000 N B. 1000 N
C. 5000 N D. 125 N
ANS : A
V.V.I.
QUESTION

Q. If a body loses half of its velocity on penetrating 3 cm in a wooden
block, then how much will it penetrate more before coming to rest ?
A. 1 cm B. 2 cm
C. 3 cm D. 4 cm
ANS : A
V.V.I.
QUESTION

Q. A ball is dropped on to the floor from a height of 10 m. It rebounds
to a height of 2.5 m. If the ball is in contact with floor for 0.01 s.
What is the average acceleration during contact ?
A. 700 m/s2 B. 1400 m/s2
C. 2100 m/s2 D. 2800 m/s2
ANS : C
V.V.I.
QUESTION

Q. A block of mass m is placed on a smooth plane inclined at an angle
θ with the horizontal. The force exerted by the plane on the block
has a magnitude
A. mg B. mg sec θ
C. mg cos θ D. mg sin θ
ANS : C
V.V.I.
QUESTION

Q. In the above problem normal reaction between ground and wedge
will have magnitude equal to
A. N cos θ + Mg
B. N cos θ + Mg + mg
C. N cos θ – Mg
D. N sin θ + Mg + mg
ANS : A
V.V.I.
QUESTION

Q. A body weight 8 g when placed in one pan and 18 g when placed on
the other pan of a false balance. If the beam is horizontal when
both the pans are empty, the true weight of the body is
A. 13 g B. 12 g
C. 15.5 g D. 15 g
ANS : B
V.V.I.
QUESTION

Q. The line of action of the resultant of two like parallel forces shifts
by one-fourth of the distance between the forces when the two
forces are interchanged. The ratio of the two forces is
A. 1 : 2 B. 2 : 3
C. 3 : 4 D. 3 : 5
ANS : D
V.V.I.
QUESTION

Q. Choose the incorrect statement.
A. No work is done if the displacement is perpendicular to the direction
of the applied force
B. Frictional force is non-conservative
C. All the central forces are non-conservative
D. Kinetic energy is conserved in elastic collision
ANS : C
V.V.I.
QUESTION

Q. A car moving with a speed of 50 km/h can be stopped by brakes,
over a distance of 6 m. If the same car is moving at a speed of 100
km/h, the stopping distance is
A. 12 m B. 18 m
C. 6 m D. 24 m
ANS : D
V.V.I.
QUESTION

Q. The acceleration of an object moving in a circle of radius R with
uniform speed v is
A. v2 / R
B. v2 / 2R
C. 2v2 / R
D. 3v2 / 2R
ANS : A
V.V.I.
QUESTION

Q. Two forces in the ratio 1 : 2 act simultaneously on a particle. The
resultant of these forces is three times the first force. The angle
between them is
A. 0 ˚ B. 60˚
C. 90˚ D. 45˚
ANS : A
V.V.I.
QUESTION

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