Force and Laws of Motion Class 9 MCQ. We covered all the Force and Laws of Motion Class 9 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Force and Laws of Motion for NEET Students
A cylinder of mass 20 kg is sliding on a plane with a velocity of 12 m/s. Find the distance covered by it before stopping if the coefficient of friction between the surface and the cylinder is 0.3. (Take g = 10 m/s²)
(A) 44 m
(B) 24 m
(C) 34 m
(D) 14 m
Option b – 24 m
The resultant force of 10 N and 20 N cannot be
(A) 21 N
(B) 9 N
(C) 12 N
(D) 30 N
Option b – 9 N
A force of 6 N is applied to one end of the rope of length 10 m. Find the tension in the rope at 4 m from this end.
(A) 3.6 N
(B) 4.2 N
(C) 5.8 N
(D) 1.9 N
Option a – 3.6 N
Calculate the maximum fraction of the length of the chain that can hang over one edge of the table if a heavy chain lies on a horizontal tabletop and the coefficient of friction between the chain and the table surface is 0.5.
(A) 64.23%
(B) 15.14%
(C) 24.64%
(D) 33.33%
Option d – 33.33%
When a flat block is moved over the flat surface, the opposing force is due to
(A) rolling friction.
(B) static friction.
(C) sliding friction.
(D) normal force.
Option c – sliding friction.
A ball of mass 600 g is dropped from a height of 5 m. A boy on the ground hits the ball vertically upwards with a bat with an average force of 100 newtons so that it attains a vertical height of 20 m. The time for which the ball remains in contact with the bat is (g = 10 m/s²)
(A) 0.12 s
(B) 0.18 s
(C) 0.04 s
(D) 0.02 s
Option b – 0.18 s
The linear momentum p of a body of mass 5 kg varies with time t as p = 20t + 10, where p and t are in SI units. It follows that the body is moving with an
(A) constant speed.
(B) constant acceleration.
(C) variable acceleration.
(D) variable retardation.
Option b – constant acceleration.
Calculate the change in momentum when a force of 20 N acts on a body of mass 20 kg for 5 s.
(A) 10 kg m/s
(B) 40 kg m/s
(C) 50 kg m/s
(D) 100 kg m/s
Option d – 100 kg m/s
What will be the direction and magnitude of the net force on the stone of 0.4 kg when it is thrown vertically upwards?
(A) 3.92 vertically downwards
(B) 3.92 vertically upwards
(C) 1.24 vertically downwards
(D) 1.24 vertically upwards
Option a – 3.92 vertically downwards
A ball of mass 0.1 kg strikes the wall normally with a speed of 20 m/s and reflects back with the same velocity. If its time of contact with the wall is 0.01 s, then find the force exerted by the ball on the wall.
(A) 300 N
(B) 100 N
(C) 200 N
(D) 400 N
Option d – 400 N
Find the maximum force of friction at the point of contact between the ladder and the floor, if a 400 N ladder is placed against a smooth vertical wall and the coefficient of friction between the ladder and floor is 0.4.
(A) 400 N
(B) 160 N
(C) 180 N
(D) 200 N
Option b – 160 N
An inclined plane of length 7 m making an angle of 45° with the horizontal is placed in a uniform electric field E = 100 Vm. A particle of mass 1 kg and charge 102 C is allowed to slide down from the rest position from a maximum height of the slope. If the coefficient of friction is 0.1, the time taken by the particle to reach the bottom is ………
(A) 1 s
(B) 1.41 s
(C) 3.2 s
(D) 1.91 s
Option b – 1.41 s
A wooden box of mass 20 kg is at rest on the horizontal surface. A force of 42 N is required to just slide it. Calculate the coefficient of static friction. (Take g = 10 m/s²)
(A) 0.1
(B) 0.21
(C) 0.42
(D) 0.54
Option b – 0.21
When surfaces are made highly smooth, the friction between two surfaces ( Force and Laws of Motion Class 9 MCQ )
(A) increases.
(B) decreases to a very small value.
(C) remains same.
(D) is absent.
Option a – increases.
What will be the acceleration of the block of mass 5 kg when it is placed on a rough horizontal surface having a coefficient of friction of 0.4 and acted by a horizontal force of 180 N?
(A) 36 m/s²
(B) 7 m/s²
(C) 14 m/s²
(D) 32 m/s²
Option d – 32 m/s²
Calculate the minimum radius of the arc traced by a car while taking a turn at a speed of 15 m/s. (u=0.8, g = 10 m/s²)
(A) 19.4 m
(B) 32.6 m
(C) 20.4 m
(D) 28.12 m
Option d – 28.12 m
Calculate the thrust force of a rocket propelling with an exhaust velocity of 100 m/s with a rate of combustion of 10 kg/s.
(A) 800 N
(B) 9200 N
(C) 1000 N
(D) 1400 N
Option c – 1000 N
Calculate the minimum time required to raise the stone of 5 kg up to a height of 5 m starting from rest, if it is suspended with a rope of breaking strength 20 kg. -wt. (g = 10 m/s²)
(A) 1 s
(B) 0.1 s
(C) 0.7 s
(D) 0.6 s
Option d – 0.6 s
A man standing in a lift holds a spring balance with a load of 2 kg suspended from it. What would be the reading of the balance when the lift is descending with an acceleration of 4.2 m/s²
(A) 2 kg
(B) 2.9 kg
(C) 1.14 kg
(D) 0.75 kg
Option c – 1.14 kg
Find the mass of a bullet fired from a gun of mass 5 kg. The muzzle speed of the bullet is 250 m/s and the recoil speed of the gun is – 4 m/s.
(A) 0.06 kg
(B) 0.08 kg
(C) 0.5 kg
(D) 0.01 kg
Option b – 0.08 kg
Assertion: Two bodies of equal mass, one in motion and the other at rest possess the same inertia. Reason: Inertia is a factor of mass only and does not depend upon the velocity.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is True.
Option a – The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
A body of mass M at rest explodes into three pieces, two of which are of mass M/4 each, and are thrown off in perpendicular directions with velocities of 6 m/s and 8 m/s respectively. The third piece will be thrown-off with a velocity of
(A) 1.5 m/s
(B) 2.0 m/s
(C) 2.5 m/s
(D) 5.0 m/s
Option d – 5.0 m/s
A person is sitting in a traveling train facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is
(A) moving forward and gaining speed.
(B) moving forward and losing speed.
(C) moving forward with uniform speed.
(D) moving backward with uniform speed.
Option a – moving forward and gaining speed.
The sum of the magnitude of two forces acting at a point is 20 N and their resultant 15 N is at 90° with a force of smaller magnitude. The two forces are
(A) 8.46 N, 11.54 N
(B) 2.11 N, 17.89 N
(C) 3.96 N, 16.04 N
(D) 4.37 N, 15.63 N
Option d – 4.37 N, 15.63 N
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