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NECO SSCE Physics 2026 past questions and answers

This 2026 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 2026 set with instant marking.

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Sample NECO SSCE Physics 2026 questions

1. A nucleus emits an alpha particle. What are the changes in its nucleon number and proton number?
  1. Nucleon number decreases by 4 and proton number decreases by 2
  2. Nucleon number decreases by 2 and proton number decreases by 4
  3. Nucleon number remains unchanged and proton number decreases by 2
  4. Nucleon number decreases by 4 and proton number increases by 2

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

An alpha particle contains two protons and two neutrons, so its emission reduces the nucleon number by 4 and proton number by 2.

2. A radioactive sample has a half-life of 12 hours. What fraction of the original sample remains after 36 hours?
  1. 1/2
  2. 1/8
  3. 1/4
  4. 1/16

Answer: B. 1/8

Thirty-six hours is three half-lives, so the remaining fraction is (1/2)^3 = 1/8.

3. An ideal transformer has 200 turns in its primary coil and 1000 turns in its secondary coil. If the primary voltage is 12 V, what is the secondary voltage?
  1. 2.4 V
  2. 12 V
  3. 60 V
  4. 240 V

Answer: C. 60 V

For an ideal transformer, Vs/Vp = Ns/Np = 1000/200 = 5, giving Vs = 60 V.

4. A silicon diode is connected in forward bias to a suitable supply. Which statement best describes the circuit?
  1. The depletion layer widens and current is blocked
  2. The diode behaves as an open circuit in both directions
  3. The P-side is connected to the negative terminal and current flows freely
  4. The depletion layer narrows and conventional current can flow from P-side to N-side

Answer: D. The depletion layer narrows and conventional current can flow from P-side to N-side

Forward bias connects P to positive and N to negative, narrowing the depletion layer and permitting conventional current.

5. A solar panel delivers a steady power of 600 W for 5 hours. How much electrical energy does it produce?
  1. 3 kWh
  2. 30 kWh
  3. 0.12 kWh
  4. 1.2 kWh

Answer: A. 3 kWh

Energy in kWh is power in kW multiplied by time, so 0.6 x 5 = 3 kWh.

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