Force, Motion & Gravity MCQs with Answers

The ratio of the inertial mass to gravitational mass is equal to ?

• A.0
• B.1
• C.9.8
• D.Infinity

Gravitational field of Earth is directed _?

• A.Tangential to the Earth's surface
• B.Away from the Earth
• C.Parallel to the Earth's surface
• D.Towards the Earth

"The rate of change in momentum is equal to applied force." This statement is called:

• A.Newton's First Law of motion
• B.Newton's Second Law of motion
• C.Newton's Third Law of motion
• D.Law of Conservation of Momentum

A stone is dropped from the top of a tower 400 ft high into a lake. How many seconds will it take before the impact sound is heard at the top of the tower?

• A.5 seconds
• B.4 seconds
• C.6 seconds
• D.8 seconds

A racing car accelerates uniformly through three gears; changes with the following average speed: 20 m/s for 2.0 s, 40 m/s for 2.0 s, and 60 m/s for 6.0 s. What is the overall average speed of the car?

• A.48 m/s
• B.40 m/s
• C.45 m/s
• D.50 m/s

Unit of angular velocity is?

• A.m/s
• B.rad/s²
• C.m/s²
• D.rad/s

A torque of 2 × 10⁻⁴ Nm is applied to produce an angular acceleration of 4 rad/s² in a rotating body. What is the moment of inertia of the body?

• A.5 × 10⁻⁴ kgm²
• B.0.8 × 10⁻⁴ kgm²
• C.2 × 10⁻⁴ kgm²
• D.0.5 × 10⁻⁴ kgm²

A movable pulley is used as ?

• A.Force multiplier
• B.Speed multiplier
• C.Direction changer
• D.Energy multiplier

In the context of relativity, what is needed to determine if a baseball in empty space is moving?

• A.A stopwatch
• B.Another object for reference
• C.A light source
• D.A magnetic field

If the earth stopped rotating, the weight of objects at either pole would ?

• A.Be greater
• B.Be less
• C.Remain unchanged
• D.Become zero