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WAEC WASSCE Physics 2003 past questions and answers

This 2003 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 2003 set with instant marking.

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Sample WAEC WASSCE Physics 2003 questions

1. A perpendicular force of 25 N acts 0.40 m from a pivot. What is its moment about the pivot?
  1. 6.25 N m
  2. 25.4 N m
  3. 10 N m
  4. 62.5 N m

Answer: C. 10 N m

Moment equals force multiplied by perpendicular distance, so 25 x 0.40 = 10 N m.

2. A 5 kg object is raised vertically through 2 m. Taking g as 10 m/s^2, how much work is done against gravity?
  1. 100 J
  2. 25 J
  3. 50 J
  4. 250 J

Answer: A. 100 J

The work done is mgh = 5 x 10 x 2 = 100 J.

3. A machine receives 500 J of energy and delivers 350 J of useful output energy. What is its efficiency?
  1. 30%
  2. 65%
  3. 75%
  4. 70%

Answer: D. 70%

Efficiency is useful output divided by input multiplied by 100%, giving 350/500 x 100% = 70%.

4. What is the pressure due to water at a depth of 2.0 m? Take water density as 1000 kg/m^3 and g as 10 m/s^2.
  1. 2000 Pa
  2. 20000 Pa
  3. 5000 Pa
  4. 200000 Pa

Answer: B. 20000 Pa

The hydrostatic pressure is rho gh = 1000 x 10 x 2 = 20000 Pa.

5. How much heat is required to raise the temperature of 0.50 kg of water by 10 degrees C? The specific heat capacity of water is 4200 J/(kg degrees C).
  1. 21000 J
  2. 2100 J
  3. 42000 J
  4. 84000 J

Answer: A. 21000 J

Using Q = mc deltaT gives 0.50 x 4200 x 10 = 21000 J.

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