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JAMB Physics Past Questions 2018

10 questions from the JAMB 2018 Physics paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2018Question 1 · Electricity and Magnetism
The electrochemical equivalent of silver is . If of silver is to be deposited by electrolysis on a surface by passing a steady current for , the current must be?
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: B.

I=m/(zt)=36/(0.0012x300)=.

JAMB 2018Question 2 · Electricity and Magnetism
The resistance of a car head lamp, drawing current from a battery is ____.
  1. A.0.3Ω
  2. B.3.3Ω
  3. C.3.6Ω
  4. D.4.8Ω
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Answer: C. 3.6Ω

R=/P==3.6 ohms.

JAMB 2018Question 3 · Electronics and Alternating Current
In a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are and respectively. What is the voltage across the capacitor?
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: D.

At resonance in an R-L-C circuit, VL=VC, so the capacitor voltage is .

JAMB 2018Question 4 · Heat and Thermodynamics
The linear expansivity of brass is . If the volume of a piece of brass is at , what is the volume at
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: B.

Volume expansivity==; V=15(1+)=.

JAMB 2018Question 5 · Mechanics, Motion, and Energy
A lead bullet of mass is fired with a velocity of into a lead block of mass . Given that the lead block can move freely, the final kinetic energy after impact is
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: C.

Perfectly inelastic collision: v=(0.05x200)/1=; KE=0.5(1)()=.

JAMB 2018Question 6 · Mechanics, Motion, and Energy
The tendency of a body to remain at rest when a force is applied to it is called.
  1. A.Impulse
  2. B.Momentum
  3. C.Inertia
  4. D.Friction
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Answer: C. Inertia

Inertia is the tendency of a body to resist changes to its state of rest or motion.

JAMB 2018Question 7 · Nuclear and Modern Physics
One of the features of the fission process is that
  1. A.it leads to chain reaction
  2. B.its products are not radioactive
  3. C.neutrons are not released
  4. D.the of the masses of the reactants equals the sum of the masses of the products
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Answer: A. it leads to chain reaction

Nuclear fission releases neutrons that can trigger further fissions, causing a chain reaction.

JAMB 2018Question 8 · Properties of Matter and Fluids
Temperature is the property of a body which is proportional to the ____.
  1. A.total kinetic energy of its molecules
  2. B.average kinetic energy of its molecules
  3. C.average speed of its molecules
  4. D.maximum speed of its molecules
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Answer: B. average kinetic energy of its molecules

Temperature is proportional to the average kinetic energy of the molecules.

JAMB 2018Question 9 · Properties of Matter and Fluids
An object weighs in air and in water. The weight of the object when completely immersed in a liquid of relative density 1.4 is
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: B.

Upthrust in water=30-21=; in the liquid (RD 1.4), upthrust=1.4x9=; weight=30-12.6=.

JAMB 2018Question 10 · Waves, Sound, and Optics
Musical instruments playing the same note can be distinguished from one another owing to the difference in their
  1. A.quality
  2. B.pitch
  3. C.intensity
  4. D.loudness
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Answer: A. quality

Quality (timbre) distinguishes instruments playing the same note.

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