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WAEC WASSCE Physics 2007 past questions and answers

This 2007 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 2007 set with instant marking.

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Sample WAEC WASSCE Physics 2007 questions

1. A wire 2.0 m long and of cross-sectional area 1.0 x 10^-6 m^2 extends by 1.0 mm under a force of 20 N. What is the Young modulus of the wire?
  1. 2.0 x 10^10 Pa
  2. 4.0 x 10^10 Pa
  3. 2.0 x 10^11 Pa
  4. 4.0 x 10^11 Pa

Answer: B. 4.0 x 10^10 Pa

Young modulus = (F/A)/(extension/length) = (20/1.0 x 10^-6)/(0.001/2.0) = 4.0 x 10^10 Pa.

2. A 10 m metal rail has a linear expansivity of 1.2 x 10^-5 K^-1. How much longer does it become when its temperature rises by 50 K?
  1. 0.60 mm
  2. 3.0 mm
  3. 6.0 mm
  4. 60 mm

Answer: C. 6.0 mm

The increase in length is alpha L deltaT = 1.2 x 10^-5 x 10 x 50 = 0.006 m, or 6.0 mm.

3. How much heat is required to raise the temperature of 0.50 kg of water by 20 K? Take the specific heat capacity of water as 4200 J kg^-1 K^-1.
  1. 2,100 J
  2. 8,400 J
  3. 21,000 J
  4. 42,000 J

Answer: D. 42,000 J

Using Q = mc deltaT gives Q = 0.50 x 4200 x 20 = 42,000 J.

4. A fixed mass of gas occupies a rigid vessel at a pressure of 1.2 x 10^5 Pa and temperature 300 K. What is its pressure when heated to 450 K?
  1. 1.8 x 10^5 Pa
  2. 8.0 x 10^4 Pa
  3. 2.4 x 10^5 Pa
  4. 3.0 x 10^5 Pa

Answer: A. 1.8 x 10^5 Pa

At constant volume, pressure is proportional to absolute temperature, so P2 = 1.2 x 10^5 x 450/300 = 1.8 x 10^5 Pa.

5. How much energy is needed to melt 0.20 kg of ice at 0 degrees C? The specific latent heat of fusion of ice is 3.34 x 10^5 J kg^-1.
  1. 6.68 x 10^3 J
  2. 6.68 x 10^4 J
  3. 1.67 x 10^5 J
  4. 3.34 x 10^5 J

Answer: B. 6.68 x 10^4 J

The energy is mL = 0.20 x 3.34 x 10^5 = 6.68 x 10^4 J.

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