Force, Motion & Gravity MCQs with Answers

The momentum of an object changes from 20 kg m/s to 5 kg m/s in 3 sec. The value of the applied force will be ?

• A.15 N
• B.5 N
• C.10 N
• D.25 N

Inclined plane is a simple machine with one end relatively higher than the other end is known as ?

• A.Ramp
• B.Lever
• C.Pulley
• D.Wedge

A force is a push or pull. Which two things are needed to fully describe a force?

• A.Mass and acceleration
• B.Speed and time
• C.Strength and direction
• D.Weight and distance

If there is no external force applied to a system, then the total momentum of that system remains constant. This is known as _?

• A.Law of conservation of momentum
• B.Newton's First Law of Motion
• C.Law of conservation of energy
• D.Newton's Third Law of Motion

The moment of inertia of a solid sphere is?

• A.1/2 mr²
• B.2/5 mr²
• C.2/3 mr²
• D.3/5 mr²

If you travel to the Moon your weight will change because:

• A.The pull of gravity is weaker there than on Earth
• B.The Moon has no atmosphere
• C.Your mass decreases on the Moon
• D.The Moon is farther from the Sun than Earth

The dimensional formula of angular velocity is?

• A.[M]⁰[L]⁰[T]⁻¹
• B.[M]⁰[L][T]⁻¹
• C.[M]⁰[L]⁰[T]⁻²
• D.[M][L]⁰[T]⁻¹

Swimmers make their bodies streamlined to friction under water.

• A.Increase
• B.Reduce
• C.Maintain
• D.Eliminate

Angular momentum is conserved under ?

• A.Tension force
• B.Frictional force
• C.Central force
• D.Non-conservative force

When is the restoring force minimum in simple harmonic motion (SHM), given F = -kx?

• A.At the extreme positions
• B.At the equilibrium (mid) position
• C.At the amplitude points
• D.At maximum displacement