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JAMB Physics 2023 past questions and answers

4 questions. Try each one, then open the answer to check yourself and read the explanation.

Question 4

Density and Upthrust

The density of a solid is defined as the

  1. A.volume per unit mass of the solid
  2. B.weight per unit volume of the solid
  3. C.mass per unit volume of the solid
  4. D.mass of the solid compared to the mass of an equal volume of water
Show the answer and explanation

Answer: C (mass per unit volume of the solid)

Explanation

Density = mass ÷ volume. Option D describes relative density.

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Question 10

Radioactivity and Nuclear Physics

The net charge on the atom is zero because

  1. A.the electrons and the protons that are charged are in the nucleus
  2. B.the total charge on the electrons is equal to the total charge on the neutrons
  3. C.the neutrons form a shield around the charged protons.
  4. D.the number of electrons in an atom is equal to the number of protons.
Show the answer and explanation

Answer: D (the number of electrons in an atom is equal to the number of protons.)

Explanation

Each proton carries +e and each electron −e. A neutral atom has equal numbers of them, so the charges cancel.

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Question 15

Sound

In a resonance tube experiment which is illustrated above, the velocity of sound in air is 327.68m/s, the frequency of the turning fork used is therefore

Diagram for this question
  1. A.128Hz
  2. B.256Hz
  3. C.512Hz
  4. D.768Hz
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Answer: C (512Hz)

Explanation

At the first resonance the 16 cm air column is a quarter wavelength: λ = 4 × 0.16 = 0.64 m. f = v/λ = 327.68 ÷ 0.64 = 512 Hz.

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Question 36

Waves

The wave motion shown (Fig. 3) has a frequency of

Diagram for this question
  1. A.0.1Hz
  2. B.0.2Hz
  3. C.5Hz
  4. D.10Hz
Show the answer and explanation

Answer: C (5Hz)

Explanation

One complete cycle (crest and trough) takes 0.2 s, so the period is 0.2 s and f = 1/0.2 = 5 Hz.

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