JAMB Physics Past Questions 2023

10 questions from the JAMB 2023 Physics paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2023Question 1 · Electricity and Magnetism

The terminals of a battery of emf

24.0 V

and internal resistance of 1.0 Ω is connected to an external resistor 5.0 Ω. Find the terminal p.d.

A. $18.0 V$
B. $12.0 V$
C. $16.0 V$
D. $20.0 V$

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Answer: D. $20.0 V$

I=24/(5+1)= $4 A$ ; terminal p.d.=4x5= $20 V$ .

JAMB 2023Question 2 · Electricity and Magnetism

Which of the following is a type of incandescent light source?

A.Fluorescent lamp
B.LED lamp
C.Tungsten filament lamp
D.Neon lamp

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Answer: C. Tungsten filament lamp

A tungsten filament lamp is an incandescent light source.

JAMB 2023Question 3 · Electricity and Magnetism

A metal sphere is placed on an insulating stand. A negatively charged rod is brought close to it. If the sphere is earthed and the rod is taken away, what will be the charge on the sphere?

A.The sphere will remain neutral.
B.The sphere will have a net negative charge.
C.The sphere will have a net positive charge.
D.The sphere will become polarized

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Answer: C. The sphere will have a net positive charge.

Earthing removes electrons repelled by the rod; once earth then rod are removed, the sphere is left positively charged.

JAMB 2023Question 4 · General Physics and Measurement

The branch of physics that deals with the motion of objects and the forces acting on them is called:

A.Electromagnetism
B.Thermodynamics
C.Mechanics
D.Quantum mechanics

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Answer: C. Mechanics

Mechanics studies motion and the forces causing it.

JAMB 2023Question 5 · Heat and Thermodynamics

Which of the following thermometers measures temperature from the thermal radiation emitted by objects?

A.Pyrometer thermometer
B.Platinum resistance thermometer
C.Thermocouple thermometer
D.Constant pressure gas thermometer

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Answer: A. Pyrometer thermometer

A pyrometer measures temperature from an object's thermal (infrared) radiation.

JAMB 2023Question 6 · Mechanics, Motion, and Energy

A man swung an object of mass

2 kg

in a circular path with a rope

1.2 m

long. If the object was swung at 120 rev/min, find the tension in the rope.

A.400
B.288
C.240
D.379

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Answer: D. 379

omega=2 pi(120)/60= $12.57 rad s^{- 1}$ ; T= $m o m e g a^{2} r$ =2x12. $5 7^{2} \times 1.2$ ≈ $379 N$ .

JAMB 2023Question 7 · Mechanics, Motion, and Energy

The working of the beam balance is based on the principle of

A.moments
B.conservation of energy
C.equivalence
D.floatation

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Answer: A. moments

A beam balance works on the principle of moments.

JAMB 2023Question 8 · Nuclear and Modern Physics

Which of the following is NOT an example of elementary modern physics?

A.Classical mechanics
B.Quantum mechanics
C.Special relativity
D.Nuclear physics

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Answer: A. Classical mechanics

Classical mechanics predates and is distinct from modern physics (quantum, relativity, nuclear).

JAMB 2023Question 9 · Waves, Sound, and Optics

Rainbow formation is as a result of the combination of which of the following phenomena? (i) Reflection (ii) Dispersion (iii) Total internal reflection (iv) Refraction

A.(ii) and (iv) only
B.(i), (iii) and (iv) only
C.(ii), (iii) and (iv) only
D.(i), (ii) and (iv) only

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Answer: C. (ii), (iii) and (iv) only

Rainbows form through dispersion, internal reflection and refraction of light in raindrops.

JAMB 2023Question 10 · Waves, Sound, and Optics

An object is placed

35 cm

away from a convex mirror with a focal length of magnitude

15 cm

. What is the location of the image?

A. $26.25 cm$ behind the mirror
B. $10.5 cm$ behind the mirror
C. $26.25 cm$ in front of the mirror
D. $10.5 cm$ in front of the mirror

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Answer: B. $10.5 cm$ behind the mirror

1/v= $\frac{1}{15}$ + $\frac{1}{35}$ = $\frac{2}{21}$ gives v= $10.5 cm$ behind the mirror (virtual image).

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JAMB Physics Past Questions 2023

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