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NECO SSCE Physics 2025 past questions and answers

This 2025 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 2025 set with instant marking.

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Sample NECO SSCE Physics 2025 questions

1. A radioactive sample has a mass of 80 mg and a half-life of 6 hours. What mass remains after 18 hours?
  1. 5 mg
  2. 20 mg
  3. 10 mg
  4. 40 mg

Answer: C. 10 mg

Eighteen hours is three half-lives, so the mass falls to 80/2^3 = 10 mg.

2. When a nucleus emits an alpha particle, how do its mass number and proton number change?
  1. Mass number decreases by 4 and proton number decreases by 2
  2. Mass number decreases by 2 and proton number decreases by 4
  3. Mass number is unchanged and proton number decreases by 2
  4. Mass number decreases by 4 and proton number increases by 2

Answer: A. Mass number decreases by 4 and proton number decreases by 2

An alpha particle contains two protons and two neutrons, so emission lowers the mass number by 4 and proton number by 2.

3. What is the principal function of a semiconductor diode in a simple circuit?
  1. To store electric charge indefinitely
  2. To increase the frequency of an alternating supply
  3. To convert electrical energy directly into sound
  4. To allow current to pass mainly in one direction

Answer: D. To allow current to pass mainly in one direction

A diode is a rectifying component that conducts readily in one direction and blocks current in the opposite direction.

4. An ideal transformer has 1,000 turns in its primary coil and 50 turns in its secondary coil. If the primary voltage is 240 V, what is the secondary voltage?
  1. 4.8 V
  2. 12 V
  3. 48 V
  4. 240 V

Answer: B. 12 V

For an ideal transformer Vs/Vp = Ns/Np, giving Vs = 240 x 50/1,000 = 12 V.

5. What is meant by the threshold frequency of a metal in the photoelectric effect?
  1. The frequency at which emitted electrons stop moving
  2. The highest frequency the metal can absorb
  3. The minimum light frequency that can release electrons from the metal
  4. The frequency of light reflected by the metal

Answer: C. The minimum light frequency that can release electrons from the metal

Threshold frequency is the minimum incident-light frequency whose photon energy can overcome the metal's work function.

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