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NECO SSCE Physics 2020 past questions and answers

This 2020 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 2020 set with instant marking.

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Sample NECO SSCE Physics 2020 questions

1. A wave travels at 18 m/s and has a wavelength of 1.5 m. What is its frequency?
  1. 9 Hz
  2. 10 Hz
  3. 12 Hz
  4. 27 Hz

Answer: C. 12 Hz

Using v = fλ gives f = 18/1.5 = 12 Hz.

2. How much heat is needed to raise the temperature of 0.50 kg of water by 10 K? Take the specific heat capacity of water as 4200 J kg^-1 K^-1.
  1. 21 000 J
  2. 4 200 J
  3. 42 000 J
  4. 210 000 J

Answer: A. 21 000 J

Q = mcΔT = 0.50 × 4200 × 10 = 21 000 J.

3. A ray passes from air into glass of refractive index 1.5 at an angle of incidence of 30 degrees. What is the angle of refraction, to the nearest degree?
  1. 15 degrees
  2. 30 degrees
  3. 45 degrees
  4. 19 degrees

Answer: D. 19 degrees

Snell's law gives sin r = sin 30 degrees/1.5 = 1/3, so r is about 19 degrees.

4. A metal rod 2.0 m long has a linear expansivity of 1.2 × 10^-5 K^-1. How much does it lengthen when heated through 50 K?
  1. 0.12 mm
  2. 1.2 mm
  3. 12 mm
  4. 0.60 mm

Answer: B. 1.2 mm

The increase is αLΔT = 1.2 × 10^-5 × 2.0 × 50 = 0.0012 m, or 1.2 mm.

5. An object is placed 30 cm from a converging lens of focal length 20 cm. How far from the lens is the real image formed?
  1. 60 cm
  2. 12 cm
  3. 50 cm
  4. 30 cm

Answer: A. 60 cm

Using 1/f = 1/u + 1/v gives 1/v = 1/20 - 1/30 = 1/60, so v = 60 cm.

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