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NECO SSCE Physics 2010 past questions and answers

This 2010 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 2010 set with instant marking.

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Sample NECO SSCE Physics 2010 questions

1. An ideal transformer has 500 turns in its primary coil and 1000 turns in its secondary coil. If the primary voltage is 120 V, what is the secondary voltage?
  1. 60 V
  2. 240 V
  3. 120 V
  4. 480 V

Answer: B. 240 V

For an ideal transformer, Vs/Vp = Ns/Np = 1000/500, so Vs = 240 V.

2. A transformer takes 1000 W of electrical power and delivers 800 W to a load. What is its efficiency?
  1. 20%
  2. 60%
  3. 80%
  4. 125%

Answer: C. 80%

Efficiency is (output/input) x 100%, which is (800/1000) x 100% = 80%.

3. An alternating voltage has a peak value of 170 V. What is its approximate rms value?
  1. 240 V
  2. 85 V
  3. 170 V
  4. 120 V

Answer: D. 120 V

The rms voltage is Vpeak/sqrt(2), so 170/sqrt(2) is approximately 120 V.

4. In a simple circuit, a silicon diode is forward biased. Which statement best describes the conventional current through it?
  1. It flows from the cathode to the anode only when reverse biased
  2. It is blocked in both directions
  3. It flows equally well in either direction
  4. It can flow from the anode to the cathode when the forward voltage is sufficient

Answer: D. It can flow from the anode to the cathode when the forward voltage is sufficient

A forward-biased diode conducts conventional current from its anode to its cathode once the barrier is overcome.

5. For a two-input NAND gate, what is the output when both inputs are 1?
  1. 1
  2. 0
  3. Either 0 or 1
  4. The output is undefined

Answer: B. 0

A NAND gate gives the inverse of the AND result, so inputs 1 and 1 produce 0.

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