PassSparkWAEC WASSCE Physics 2018 past questions and answers
This 2018 WAEC WASSCE Physics set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2018 set with instant marking.
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Sample WAEC WASSCE Physics 2018 questions
1. A quantity has dimensions M L^-1 T^-2. Which physical quantity does it represent?
- Pressure
- Energy
- Power
- Momentum
Answer: A. Pressure
Pressure is force per area, so its dimensions are (M L T^-2)/L^2 = M L^-1 T^-2.
2. A vernier caliper has a least count of 0.01 cm; its main-scale reading is 2.3 cm and the sixth vernier division coincides with a main-scale mark. What length does it indicate?
- 2.30 cm
- 2.36 cm
- 2.60 cm
- 2.06 cm
Answer: B. 2.36 cm
The reading is 2.3 cm + (6 x 0.01 cm) = 2.36 cm.
3. Two forces of 6 N and 8 N act at right angles to each other; what is the magnitude of their resultant?
- 2 N
- 14 N
- 10 N
- 48 N
Answer: C. 10 N
For perpendicular forces, the resultant is sqrt(6^2 + 8^2) = 10 N.
4. A trolley starts from rest and accelerates uniformly at 3 m/s^2 for 4 s; how far does it travel?
- 12 m
- 18 m
- 48 m
- 24 m
Answer: D. 24 m
Using s = ut + 0.5at^2 with u = 0 gives s = 0.5 x 3 x 4^2 = 24 m.
5. A 0.20 kg ball moving east at 15 m/s rebounds west at 5 m/s; what is the magnitude of the impulse on it?
- 4.0 N s
- 2.0 N s
- 3.0 N s
- 1.0 N s
Answer: A. 4.0 N s
Taking east as positive, the change in momentum is 0.20 x (-5 - 15) = -4.0 N s, so its magnitude is 4.0 N s.
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