NCERT Solutions for class 11 Physics | Chapter 5 - Laws of motion

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Questions
1 A force of 20 N moves a body , in its direction throught a distance of 2 m . The work done by the force is
A 22 J
B 40 J
C 10 J
D 18 J

Answer:40 J
2 A block of wood is placed on a flat horizontal surface . A force F is applied to move it parallel to the surface . If I is the frictional force developed then the resultant face acting on the body , when it is sliding is
A F + f
B F - f
C Ff
D F / f

Answer:F - f
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3 A machine gun fires a bullet of mass 40 g with a velocity of 1200 ms-1 . The man holding it can exert a maximum force on 144 N on the gum . How many bullets can he fire per second at the most ?
A one
B four
C two
D three

Answer:three
4 A passenger in a moving bus is thrown forward when the bus is suddenly stopped . This is explained
A by Newtons first law
B by Newtons second law
C by Newtons third law
D by the principle of conservation of momentum

Answer:by Newtons first law
5 A body of mass 10 kg is acted upon by two perpendicular forces, 6N and 8N. The resultant acceleration of the body is
A 1 m s–2 at an angle of tan-1 (4 / 3) w.r.t. 6N force.
B 0.2 m s–2 at an angle of tan-1 (4 / 3) w.r.t. 6N force.
C 1 m s–2 at an angle of tan-1 (3 / 4) w.r.t. 8N force.
D 0.2 m s–2 at an angle of tan-1 (3 / 4) w.r.t. 8N force.

Answer:A, c
6 Inside the nucleus , two protons are held together by a force which overcomes the repulsion . This force is called
A gravitationl force
B electrostatic force
C weak force
D strong force

Answer:strong force
7 The force required to produce an acceleration of 2 m/s2 on a mass of 2 kg is
A 4 N
B 10 N
C 22 N
D 18 N

Answer:4 N
8 Out of the basic forces , gravitational force
A ranks first in strength
B ranks second in strength
C ranks thrid in strength
D ranks fourth in strength

Answer:ranks fourth in strength
9 A heavy uniform chain lies on horizontal table top . If the coefficient of friction between the chain and the table surface is 0.25 , then the maximum fraction of the length of the chain that can hang over the edge of the table is
A 20%
B 25%
C 30%
D 35%

Answer:20%
10 The coefficient of kinetic friction is
A equal to the coefficient of static friction(t - 1.5t2)
B larger than the coefficient of static friction
C less than the coefficient of static friction
D independent of the value of the coefficient of static friction

Answer:less than the coefficient of static friction
11 A spring balance is attached to the ceiling of a lift . A msn hangs his bag on the spring and the spring reads 49 N, when the lift is stationary . If the lift moves downwards with an acceleration of 5 m/s , the reding of the spring balance will be
A 15 N
B 24 N
C 49 N
D 74 N

Answer:24 N
12 A block of wood is placed on a surface . A force is applied parallel to the surface to move the body . The frictional force developed acts
A normal to the surface upwards
B normal to the surface downwards
C along the direction of the applied force
D opposite to the direction of the applied force

Answer:opposite to the direction of the applied force
13 A passenger sitting in a bus moving at uniform speed, feels pushed backward whenever the bus is accelerated forward . This type of force is called
A Gravitational force
B real force
C fictitious force or pseudo force
D frictional force

Answer:fictitious force or pseudo force
14 The mass of a body is 2 kg . It weight is
A 19 .6 N
B 20 N
C 30 N
D 40 N

Answer:19 .6 N
15 The frame of reference attached to a satellite of the earth is
A an inertial frame
B an absolute frame at rest with respect to the stars
C a non - inertial frame
D a gravitational frame

Answer:a non - inertial frame
16 Two bodies of masses 4 kg and 5 kg are acted upon by the same force . If the acceleration of lighter body is 2 m/s2 , the acceleration of heavier body is
A 1 m/s2
B 1 . 2 m/s2
C 1 . 6 m/s2
D 1 . 8 m/s2

Answer:1 . 6 m/s2
17 A body of mass 5 kg is travelling with a uniform velocity of 2 m/s . Its momentum is
A 10 kg m/s
B 7 kg m/s
C 2 .5 kg m/s
D 3 kg m/s

Answer:10 kg m/s
18 Three forces acting at a point keep it in equilibrium . If the angle between two of the forces , 3 N and 3 N is 120o , then the third force is
A 3 N
B 5 N
C 1 N
D 12 N

Answer:3 N
19 Two forces 6 N and 8 N act at a point O . If the angle between the lines of action of the force is 90o , then their resultant is
A 14 N
B 12 N
C 10 N
D 48 N

Answer:10 N
20 A force of 12 N acts on a body of mass 2 kg . The acceleration produced on the body is
A 24 m/s2
B 6 m/s2
C 14 m/s2
D 10 m/s2

Answer:6 m/s2

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