JAMB Physics Past Questions 2015
10 questions from the JAMB 2015 Physics paper, with answers and explanations. Tap "Show answer" under each one when you are ready.
JAMB 2015Question 1 · Electricity and Magnetism
The device in which one circuit controls another, especially if the current in the second circuit is large or dangerous is known as
- A.Electromagnetic devices
- B.Magnetic relay device
- C.None at all
- D.Sextant
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Answer: B. Magnetic relay device
A relay is a device where one circuit controls another, often a larger or more dangerous one.
JAMB 2015Question 2 · Electricity and Magnetism
Which of the following instrument is most accurately for comparing electromotive force (e.m.f) of two cells?
- A.Voltmeter
- B.Meter rule
- C.Galvanometer
- D.Potentiometer
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Answer: D. Potentiometer
A potentiometer accurately compares e.m.f.s without drawing current from the cells.
JAMB 2015Question 3 · General Physics and Measurement
What is the S.I unit of relative density?
- A.kgm−2
- B.kgm2
- C.kgcm3
- D.has no S.I unit
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Answer: D. has no S.I unit
Relative density is a ratio, so it has no S.I. unit.
JAMB 2015Question 4 · Heat and Thermodynamics
In which of the following device is the expansion of solid not required? I. Simple pendulum II. Fire alarms III. Thermostat IV. Bimetallic thermometer
- A.III only
- B.II, III only
- C.I only
- D.II, III, IV only
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Answer: D. II, III, IV only
Fire alarms, thermostats and bimetallic thermometers rely on differential solid expansion.
JAMB 2015Question 5 · Heat and Thermodynamics
The two liquids which are often used in thermometer on experiment basic is known as
- A.Mercury only
- B.Alcohol and Water
- C.Mercury and Alcohol
- D.Alcohol only
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Answer: C. Mercury and Alcohol
Mercury and alcohol are the common liquids used in laboratory thermometers.
JAMB 2015Question 6 · Mechanics, Motion, and Energy
If an object is placed at a height of tem above the ground at a stationary point. It posses what types of energy?
- A.Mechanical energy
- B.Stationary energy
- C.Potential energy
- D.Vibrational energy
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Answer: C. Potential energy
A raised stationary object possesses potential energy.
JAMB 2015Question 7 · Mechanics, Motion, and Energy
If the mechanical advantage of a machine is 4. What is its ratio for LOAD to EFFORT?
- A.4:01
- B.1:04
- C.5:01
- D.2:01
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Answer: A. 4:01
Mechanical advantage = load/effort, so the ratio load:effort is 4:1.
JAMB 2015Question 8 · Mechanics, Motion, and Energy
If an object whose mass is 3kg moves in a circular path of a radius 0.7m, records a speed at 2ms−1. What is the result of the angular velocity?
- A.4rads –1
- B.1rads–1 –1
- C.3 –1rads–1
- D.4rads–1 –1
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Answer: C. 3 –1rads–1
Angular velocity ω = v/r = 0.72 ≈ 2.9rads−1, which rounds to approximately 3rads−1 (mass is irrelevant to angular velocity and is a distractor).
JAMB 2015Question 9 · Waves, Sound, and Optics
The direction of the path taken by light is called
- A.Locus
- B.Lines
- C.Ray
- D.Beam
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Answer: C. Ray
The path taken by light is called a ray.
JAMB 2015Question 10 · Waves, Sound, and Optics
Radio waves belong to the class of wave whose velocity is about
- A.34ms−1
- B.3×106ms−1
- C.3×108ms−1
- D.3×10−8ms−1
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Answer: C. 3×108ms−1
Radio waves travel at the speed of light, about 3×108 m/s.
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