PassSparkNECO SSCE Physics 2011 past questions and answers
This 2011 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 2011 set with instant marking.
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Sample NECO SSCE Physics 2011 questions
1. An ideal transformer has 600 turns on its primary coil and 50 turns on its secondary coil. If the primary voltage is 240 V, what is the secondary voltage?
- 10 V
- 20 V
- 30 V
- 40 V
Answer: B. 20 V
For an ideal transformer, Vs/Vp = Ns/Np, so Vs = 240 x 50/600 = 20 V.
2. The magnetic flux through each turn of a 200-turn coil changes by 0.003 Wb in 0.05 s. What is the magnitude of the average induced e.m.f.?
- 6 V
- 8 V
- 12 V
- 24 V
Answer: C. 12 V
Faraday's law gives emf = N x change in flux/time = 200 x 0.003/0.05 = 12 V.
3. An alternating voltage has a peak value of 170 V. What is its approximate r.m.s. value?
- 120 V
- 170 V
- 240 V
- 340 V
Answer: A. 120 V
The r.m.s. voltage is peak voltage divided by sqrt(2), giving about 120 V.
4. Two capacitors of 3 microfarads and 6 microfarads are connected in parallel. What is their combined capacitance?
- 2 microfarads
- 3 microfarads
- 6 microfarads
- 9 microfarads
Answer: D. 9 microfarads
Capacitances add in parallel, so the total is 3 + 6 = 9 microfarads.
5. A 6-ohm resistor and a 3-ohm resistor are connected in parallel. What is their equivalent resistance?
- 1 ohm
- 2 ohms
- 4.5 ohms
- 9 ohms
Answer: B. 2 ohms
The reciprocal equivalent resistance is 1/6 + 1/3 = 1/2, so the equivalent is 2 ohms.
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