Force, Motion & Gravity MCQs with Answers

If the mass of a particle is zero, its speed must be ?

• A.Infinite
• B.Equal to speed of sound
• C.Zero
• D.Equal to speed of light

A particle of mass 'm' is moving on a circular path of radius 'r' with velocity 'v', then centripetal force acting on it is F. If the velocity of particle increases by 2 times and radius of circular path increases by 4 times then new centripetal force F' will be?

• A.F' = 4F
• B.F' = 2F
• C.F' = F/2
• D.F' = F

When a liquid is placed in a container, the pressure applied to the fluid by the container is equal throughout the container is the statement of _?

• A.Bernoulli's Principle
• B.Archimedes' Principle
• C.Pascal's Law
• D.Boyle's Law

Why does cream rise and float on top of milk?

• A.Because cream is less dense than milk
• B.Because cream is heavier than milk
• C.Because cream has more fat content that pushes it upward
• D.Because cream is more viscous than milk

According to Newton's law of universal gravitation, force is directly proportional to _?

• A.Product of masses
• B.1 / (distance)²
• C.Both (a) and (b)
• D.Square of distance

The angular momentum L is given by?

• A.r × p
• B.r · p
• C.r + p
• D.p × r

The speed at which a spacecraft escapes Earth's gravity completely is called ?

• A.Orbital velocity
• B.Critical velocity
• C.Terminal velocity
• D.Escape velocity

The weight of a man in an elevator descending with an acceleration of 4.9 ms⁻² will become?

• A.Double
• B.Half
• C.One-fourth
• D.Unchanged

Past Paper MCQ

Who discovered the three laws of motion?

• A.Isaac Newton
• B.Galileo Galilei
• C.Albert Einstein
• D.Johannes Kepler

Calculate the moment of inertia of the earth about its diameter, taking it to be a sphere of 10^25 kg and diameter 12800 km.

• A.1.64 × 10^38 kg m²
• B.2.05 × 10^38 kg m²
• C.8.20 × 10^37 kg m²
• D.3.28 × 10^38 kg m²