Final Physics online test

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Answer explanation

Use Density = mass/volume

Volume = length x breadth x depth

Which force produces heating during contact with a moving object?

A weight

B friction

C electrostatic force

D magnetic force

• A

• B

• C

• D

Which power station produces the greatest atmospheric pollution for each unit of energy generated?

A a gas fired power station

B a hydroelectric power station

C a nuclear power station

D a wind farm

• A

• B

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• D

A 500 N weight is raised through a height of 5 cm. How much work is done by the force?

A 25 J

B 100 J

C2500 J

D 10 000J

• A

• B

• C

• D

Answer explanation

centi (c) means 10^-2

What is the unit of power?

A joule

B newton

C volt

D watt

• A

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A man walks across a carpet. He becomes negatively charged by friction with the carpet. What happens as he touches a metal object connected to the Earth?

A The man gains electrons.

B The man loses electrons.

C The man gains protons.

D The man loses protons.

• A

• B

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• D

Answer explanation

Electrons always flow out.

• A

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• D

Answer explanation

After finding the average time, divide by 10