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NECO SSCE Physics 2014 past questions and answers

This 2014 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 2014 set with instant marking.

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Sample NECO SSCE Physics 2014 questions

1. A radioactive sample has a half-life of 8 days. If its mass is initially 160 mg, what mass remains after 24 days?
  1. 10 mg
  2. 20 mg
  3. 40 mg
  4. 80 mg

Answer: B. 20 mg

Twenty-four days is three half-lives, so the remaining mass is 160/2^3 = 20 mg.

2. A nucleus has atomic number 17 and mass number 37. How many neutrons does it contain?
  1. 17
  2. 20
  3. 37
  4. 54

Answer: B. 20

The neutron number is the mass number minus the atomic number, giving 37 - 17 = 20.

3. What is the usual behaviour of a p-n junction diode connected in forward bias to a d.c. source?
  1. It conducts readily after the forward voltage is sufficient.
  2. It blocks current completely at every voltage.
  3. It conducts only when its temperature is below absolute zero.
  4. It changes the current into alternating current.

Answer: A. It conducts readily after the forward voltage is sufficient.

Forward bias reduces the depletion barrier, allowing substantial current to pass through the diode.

4. In an n-type semiconductor formed by donor doping, which charge carriers are in the majority?
  1. Holes
  2. Protons
  3. Neutrons
  4. Electrons

Answer: D. Electrons

Donor atoms contribute extra mobile electrons, making electrons the majority carriers in n-type material.

5. In a conventional photoelectric experiment, light below the metal's threshold frequency shines on its surface. What happens if the light intensity is increased?
  1. The emitted electrons gain greater maximum kinetic energy.
  2. The metal emits electrons at a slower rate.
  3. No photoelectrons are emitted because the frequency is below threshold.
  4. The threshold frequency becomes equal to the light frequency.

Answer: C. No photoelectrons are emitted because the frequency is below threshold.

Increasing intensity cannot compensate for photon energies below the metal's work function, so photoemission does not occur.

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