Physics and Chemistry Quiz – Class 9

A ball is thrown vertically upwards with a velocity of 20 m/s. How long will it take to return to the thrower’s hand?

• 2 s

• 4 s

• 5 s

• 10 s

Which law explains the reason why passengers tend to fall forward when a moving bus suddenly stops?

• Newton’s Second Law

• Newton’s Third Law

• Newton’s First Law

• Law of Gravitation

An object of mass 5 kg is moving with a velocity of 10 m/s. What is its kinetic energy?

• 50 J

• 100 J

• 250 J

• 500 J

When no external force acts on a system of particles, what remains conserved?

• Speed

• Acceleration

• Linear Momentum

• Kinetic Energy

A body is dropped from a certain height. After 2 seconds, what is its velocity? (g = 9.8 m/s²)

• 9.8 m/s

• 19.6 m/s

• 29.4 m/s

• 39.2 m/s

What is the work done if the angle between force and displacement is 90°?

• Maximum

• Zero

• Negative

• Positive

What is the SI unit of power?

• Watt

• Joule

• Newton

• Horsepower

Two objects of masses 2 kg and 4 kg are dropped simultaneously from the same height. Which hits the ground first?

• 2 kg

• 4 kg

• Both together

• Depends on air resistance

What type of motion does a freely suspended pendulum exhibit?

• Linear motion

• Uniform motion

• Oscillatory motion

• Random motion

The weight of an object is:

• Same everywhere

• Maximum at the equator

• Varies with location

• Zero on Earth