iGCSE Physics (0625) 1.7.3 Energy resources Paper 2-2023,2024&2025

Question

At time = 0, a cannonball is stationary inside a cannon. The cannonball is then fired from the cannon.
At time = t, the cannonball moves forwards and the cannon moves backwards.
What happens to the total kinetic energy and the total momentum of the cannon and the cannonball between time = 0 and time = t?

Answer/Explanation

Ans:

B

This question is about four methods used to produce electrical energy.

Which method has a correct description?

 

method

energy source is renewable

emits carbon dioxide

A

a hydroelectric power station

yes

no

B

a coal-fired power station

no

no

C

a wind turbine

no

yes

D

a nuclear power station

yes

yes

Answer/Explanation

Ans: A

Question

The power input to an electric motor is 400 W. The efficiency of the motor is 85%.

How much power is wasted?

A 60 W

B 85 W

C 340 W

D 470 W

Answer/Explanation

Ans: A

Question

Which row describes an advantage and a disadvantage of wind turbines?

advantage

disadvantage

A

no fuel needed

harmful gases released

B

variable supply

fuel needed

C

no harmful gases released

variable supply

D

constant supply

noisy

Answer/ExplanationAns: C

Question

An electric motor provides 900 J of useful output energy. The efficiency of the motor is 60 %.

How much electrical energy is supplied to the motor?

A 15 J

B 540 J

C 1500 J

D 5400 J

Answer/Explanation

Ans: C

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