PassSparkJAMB UTME Physics 2008 past questions and answers
This 2008 JAMB UTME 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 2008 set with instant marking.
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Sample JAMB UTME Physics 2008 questions
1. A coil of 200 turns experiences a change in magnetic flux per turn from 0.015 Wb to 0.005 Wb in 0.10 s. What is the magnitude of the average induced e.m.f.?
- 2 V
- 10 V
- 20 V
- 200 V
Answer: C. 20 V
The induced e.m.f. is N times the flux change divided by time, giving 200(0.010)/0.10 = 20 V.
2. A straight wire of length 0.40 m moves at 5.0 m/s perpendicular to a magnetic field of flux density 0.30 T. What e.m.f. is induced between its ends?
- 0.024 V
- 3.75 V
- 1.5 V
- 0.60 V
Answer: D. 0.60 V
For perpendicular motion, the motional e.m.f. is Blv = 0.30(0.40)(5.0) = 0.60 V.
3. An ideal transformer has 1,200 turns in its primary coil and 120 turns in its secondary coil. If the primary voltage is 240 V, what is the secondary voltage?
- 24 V
- 120 V
- 240 V
- 2,400 V
Answer: A. 24 V
The voltage ratio equals the turns ratio, so Vs = 240(120/1200) = 24 V.
4. An alternating voltage has a peak value of 170 V. What is its r.m.s. value?
- 85 V
- 100 V
- 120 V
- 240 V
Answer: C. 120 V
For a sinusoidal voltage, Vrms = Vpeak/sqrt(2), which is approximately 120 V.
5. A 50 Hz alternating current completes how many cycles in 3 minutes?
- 150
- 1,500
- 3,000
- 9,000
Answer: D. 9,000
Three minutes is 180 s, so the number of cycles is 50(180) = 9,000.
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