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JAMB Physics Past Questions 2010

10 questions from the JAMB 2010 Physics paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2010Question 1 · Electricity and Magnetism
When a positively charged rod is brought nearer the cap of a positively charged electroscope, the leaves divergence will?
  1. A.be induced
  2. B.converge
  3. C.diverge
  4. D.remain constant
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Answer: C. diverge

A like charge brought near the cap repels electrons in the leaves, making them diverge further.

JAMB 2010Question 2 · Electricity and Magnetism
In a discharge tube, most of the gas is pumped out so that electricity is conducted at?
  1. A.low voltage
  2. B.steady voltage
  3. C.high pressure
  4. D.low pressure
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Answer: D. low pressure

In a discharge tube, gas at low pressure conducts electricity readily.

JAMB 2010Question 3 · Electricity and Magnetism
In Faradays law of electrolysis, a graph of the mass deposited against the quantity of electricity is plotted. The slope of the graph gives?
  1. A.the energy released
  2. B.the electrochemical equivalent
  3. C.the current flowing
  4. D.the charge released
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Answer: B. the electrochemical equivalent

The slope of mass deposited vs charge gives the electrochemical equivalent.

JAMB 2010Question 4 · General Physics and Measurement
The accurate measurement of the relative density of a substance in its powdered form is done with a beam balance and?
  1. A.a density bottle
  2. B.an eureka can
  3. C.a pipette
  4. D.a burette
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Answer: A. a density bottle

A density bottle is used with a beam balance for powders.

JAMB 2010Question 5 · Heat and Thermodynamics
The small droplet of water that forms on the grass in the early hours of the morning is
  1. A.hail
  2. B.dew
  3. C.fog
  4. D.mist
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Answer: B. dew

Small water droplets forming on grass at dawn are dew.

JAMB 2010Question 6 · Heat and Thermodynamics
Two metals P and Q of length l1 and l2 are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of lengths is 3:4. What is the ratio of increase in length of P to Q?
  1. A.7:5
  2. B.5:7
  3. C.1:2
  4. D.2:1
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Answer: C. 1:2

Ratio of extensions = (2x3):(3x4) = 6:12 = 1:2.

JAMB 2010Question 7 · Mechanics, Motion, and Energy
A car moves with an initial velocity of and reaches a velocity of in . What is the acceleration of the car?
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: A.

a=(45-25)/10=/.

JAMB 2010Question 8 · Nuclear and Modern Physics
The radioisotope decays by emitting two alpha particles, three beta particles and a gamma ray. What is the mass and atomic number of the resulting element?
  1. A.215 and 88
  2. B.91 and 227
  3. C.227 and 91
  4. D.92 and 238
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Answer: C. 227 and 91

2 alpha emissions reduce mass by 8 and atomic number by 4; 3 beta emissions add 3 to atomic number: mass=227, atomic number=91.

JAMB 2010Question 9 · Waves, Sound, and Optics
The wavelength of a wave traveling with a velocity of is . What is its period?
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: D.

T=wavelength/velocity==.

JAMB 2010Question 10 · Waves, Sound, and Optics
An object high is placed from a concave mirror of focal length . The size of the image is?
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: A.

1/v=1/f-1/u=-=, v=; magnification=v/u=0.5; image size=4x0.5=.

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