CIE iGCSE Co-Ordinated Science P1.6.4 Power Exam Style Questions Paper 2
Question
Four different kettles contain different masses of water.
They are used to heat the water from room temperature to boiling point.
The kettles take different times to do this.
Which kettle has the lowest useful power output?
▶️Answer/Explanation
Ans: B
Question
A 900W oven operates for 2.0 minutes. How much energy is transferred by the oven?
(A) 7.5 J (B) 450 J (C) 1.8 kJ (D) 108 kJ
▶Answer/Explanation
Ans : D
Question
An electric motor transfers 4000 J of electrical energy to useful energy and 12 000J of electrical energy is wasted.
What is the efficiency of the motor?
(A) 25%
(B) 33%
(C) 50%
(D) 75%
▶️Answer/Explanation
Ans : A
Question
A force acting on an object increases the kinetic energy of the object from 20 J to 50 J in 5.0 s.
What is the average power produced by the force?
(A) 4.0W
(B) 6.0W
(C) 10W
(D) 14W
▶️Answer/Explanation
Ans: B