Free MCQs & Online Quiz Practice for Exams

Q: Work is said to be negative when F and d are

A) Parallel

B) Anti Parallel

C) Perpendicular

D) at 45°

Q: Two bodies of masses m1 and m2 have equal momentum their kinetic energies E1 and E2 are in the ratio

A) √m₁:√m₂

B) m₂:m₁

C) m₂:m₁

D) √m₂:√m₁

Q: The atmosphere is held to the earth by

A) Winds

B) Gravity

C) Clouds

D) The rotation of earth

Q: If momentum is increased by 20% then K.E increases by

A) 44%

B) 55%

C) 66%

D) 77%

Q: If the K.E of a body becomes four times of the initial value then new momentum will

A) Become twice its initial value

B) Become three times its initial value

C) Become four times its initial value

D) Remains constant

Q: Two bodies with kinetic energies in the ratio of 4:1 are moving with equal linear momentum The ratio of their masses is

A) 1:2

B) 1:1

C) 4:1

D) 1:4

Q: A body of mass 5 kg is moving with a momentum of 10 kg m/s A force of 0.2 N acts on it in the direction of motion of the body for 10 s The increase in its kinetic energy is

A) 2.8 J

B) 3.2 J

C) 3.8 J

D) 4.4 J

Q: If force and displacement of particle in the direction of force are doubled Work would be

A) Double

B) 4 times

C) Half

D) Unchanged

Q: The angular speed in radians/hours for daily rotation of our earth is

A) 2π

B) 4π

C) π/6

D) π/12

Q: Linear acceleration a=ra when 'q' is

A) 0°

B) 180°

C) 360°

D) 90°

Q: What is moment of inertia of a sphere

A) MR²

B) 1/2.MR²

C) 2/5(MR²)

D) 1/2.M²R

Q: A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of particle The motion of the particle takes place in a horizontal plane It follows

A) Linear momentum is constant

B) Velocity is constant

C) It moves in a circular path

D) particle move in straight line

Q: A body moving in a circular path with constant speed has

A) Constant acceleration

B) Constant retardation

C) Variable acceleration

D) Variable speed and constant velocity

Q: Astronauts appear weightless in space because

A) there is no gravity in space

B) there is no floor pushing upwards on the

C) Satellite is freely falling

D) there is no air in space

Q: Which one is constant for a satellite in orbit

A) Velocity

B) K.E

C) Angular Momentum

D) Potential Energy

Q: If the earth suddenly stops rotating the value of g at equator would

A) Decrease

B) Remain unchanged

C) Increase

D) Become Zero

Q: If solid sphere and solid cylinder of same mass and density rotate about their own axis the moment of inertia will be greater for

A) Solid sphere

B) Solid cylinder

C) The one that has the largest mass arrives first

D) The one that has the largest radius arrives first

Q: The gravitational force exerted on an astronaut on Earth's surface is 650N down When she is in the International Space Station the gravitational force on her is

A) Larger

B) Exactly the same

C) Smaller

D) Nearly but not exactly zero

Q: A solid cylinder of mass M and radius R rolls down an incline without slipping Its moment of inertia about an axis through its center of mass is MR²/2 At any instant while in motion its rotational kinetic energy about its center of mass is what fraction of its total kinetic energy

A) 1/2

B) 2/5

C) 1/3

D) 1/4

Q: For substances that do not flow easily like honey the value for the coefficient of viscosity is

A) Low

B) High

C) Zero

D) Negative