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WAEC WASSCE Physics 2004 past questions and answers

This 2004 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 2004 set with instant marking.

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Sample WAEC WASSCE Physics 2004 questions

1. A 2.0 m steel rod has a linear expansivity of 1.2 x 10^-5 K^-1. How much does its length increase when its temperature rises by 50 K?
  1. 1.2 mm
  2. 0.12 mm
  3. 12 mm
  4. 0.60 mm

Answer: A. 1.2 mm

The increase is alpha x L x change in temperature = 1.2 x 10^-5 x 2.0 x 50 = 0.0012 m, or 1.2 mm.

2. How much heat is required to raise the temperature of 0.50 kg of water by 10 K if its specific heat capacity is 4200 J kg^-1 K^-1?
  1. 2,100 J
  2. 21,000 J
  3. 42,000 J
  4. 210,000 J

Answer: B. 21,000 J

Using Q = mcΔT gives 0.50 x 4200 x 10 = 21,000 J.

3. A 0.20 kg piece of ice melts completely at 0°C; how much energy is absorbed if the specific latent heat of fusion of ice is 3.3 x 10^5 J kg^-1?
  1. 6.6 kJ
  2. 33 kJ
  3. 66 kJ
  4. 660 kJ

Answer: C. 66 kJ

The energy is mL = 0.20 x 3.3 x 10^5 = 66,000 J, or 66 kJ.

4. A wave has a wavelength of 3.0 m and a frequency of 4.0 Hz; what is its speed?
  1. 0.75 m s^-1
  2. 7.0 m s^-1
  3. 10 m s^-1
  4. 12 m s^-1

Answer: D. 12 m s^-1

Wave speed equals frequency times wavelength, so v = 4.0 x 3.0 = 12 m s^-1.

5. A person stands 170 m from a cliff and hears an echo 1.0 s after shouting; what is the speed of sound in air?
  1. 340 m s^-1
  2. 170 m s^-1
  3. 85 m s^-1
  4. 680 m s^-1

Answer: A. 340 m s^-1

The sound travels to the cliff and back, a total of 340 m in 1.0 s, so its speed is 340 m s^-1.

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