Force, Motion & Gravity MCQs with Answers

Period of a pendulum is determined by its _?

• A.Mass of the bob
• B.Material of the string
• C.Amplitude of swing
• D.Length

Consider a projectile thrown initially at a speed of 20 m/s at an angle of 76° from horizontal. When it reaches the highest point of its trajectory, the angle between its velocity and acceleration is:

• A.0°
• B.180°
• C.76°
• D.90°

Who discovered the Law of motion?

• A.Einstein
• B.Galileo
• C.Newton
• D.Aristotle

A mechanical appliance which can work on _ principle is a hydraulic system.

• A.Newton's
• B.Archimedes'
• C.Bernoulli's
• D.Pascal's

An object descends vertically at constant velocity in sea. The three forces acting on the object are viscous drag, upthrust, and weight. Which relationship between their magnitudes is correct?

• A.Weight = upthrust
• B.Weight > upthrust
• C.Weight = upthrust + viscous drag
• D.Upthrust > weight

A disc is rotating at 1 revolution per second and decelerates uniformly. How many revolutions will it complete before coming to rest?

• A.0.5
• B.1
• C.2
• D.4

The force of attraction between the particles of a gas are ?

• A.Strong
• B.Weak
• C.Moderate
• D.None of these

Which law explains why rockets move forward in space?

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

An alternate unit to kg ms⁻¹ is?

• A.N m
• B.J s
• C.Ns
• D.Pa s

A body moving in a circle, half revolution in terms of radians is equivalent to _?

• A.π/2
• B.π
• C.2π
• D.π/4