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NECO SSCE Physics 2021 past questions and answers

This 2021 NECO SSCE 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 2021 set with instant marking.

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Sample NECO SSCE Physics 2021 questions

1. How much heat is required to raise the temperature of 0.50 kg of water by 10 K? (Specific heat capacity of water = 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 Q = 0.50 × 4200 × 10 = 21,000 J.

2. What quantity of heat is needed to vaporize 0.20 kg of water at its boiling point? (Specific latent heat of vaporization = 2.26 × 10^6 J kg^-1.)
  1. 45,200 J
  2. 113,000 J
  3. 226,000 J
  4. 452,000 J

Answer: D. 452,000 J

The heat required is mL = 0.20 × 2.26 × 10^6 = 452,000 J.

3. What is a temperature of 27°C on the Kelvin scale?
  1. 300 K
  2. 246 K
  3. 273 K
  4. 310 K

Answer: A. 300 K

Adding 273 to 27°C gives approximately 300 K.

4. A gas occupies 300 cm^3 at 27°C and is heated at constant pressure to 57°C; what is its new volume?
  1. 273 cm^3
  2. 303 cm^3
  3. 330 cm^3
  4. 570 cm^3

Answer: C. 330 cm^3

At constant pressure V/T is constant, so V2 = 300 × 330/300 = 330 cm^3.

5. A wave travels at 340 m s^-1 and has a wavelength of 0.50 m; what is its frequency?
  1. 170 Hz
  2. 680 Hz
  3. 340 Hz
  4. 6.8 Hz

Answer: B. 680 Hz

Using v = fλ gives f = 340/0.50 = 680 Hz.

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