CIE iGCSE Co-Ordinated Science P1.6.1 Energy Exam Style Questions Paper 2
Question
An object of mass 5.0 kg falls vertically from rest through a height of 13 m in a vacuum.
The gravitational field strength g is 10 N/ kg.
What is the final speed of the object?
(A) 8.1 m/s (B) 10 m/s (C) 11 m/s (D) 16 m/s
▶️Answer/Explanation
Ans : D
Question
A paralympic athlete of mass 70 kg uses a wheelchair of mass 10 kg in a race.
What is the kinetic energy of the athlete and wheelchair when they are moving at 6.0 m/s?
(A) 240 J (B) 480 J (C) 1440 J (D) 2880 J
▶️Answer/Explanation
Ans: C
Question
A hydroelectric energy storage scheme stores energy by pumping water up a mountain into a lake behind a dam.
In 1.0 s, 10 000 kg of water is pumped into the lake and gains a height of 150 m. The efficiency of this process is 60%.
Gravitational field strength = 10N/ kg.
What is the energy input in 1.0 s?
(A) 9.0 × 10$^{5}$J
(B) 2.5 × 10$^{6}$J
(C) 9.0 × 10$^{6}$J
(D) 2.5 × 10$^{7}$J
▶️Answer/Explanation
Ans: D
Question
A machine has useful output energy of 1000 J and wasted energy of 300 J.
Which expression is used to calculate the efficiency of the machine?
A \(\frac{300}{1000+300} \times 100\) %
B \(\frac{300}{1000} \times 100\) %
C \(\frac{1000-300}{1000} \times 100\) %
D \(\frac{1000}{1000+300} \times 100\) %
▶️Answer/Explanation
Ans : D