JAMB Physics Past Questions 2025

10 questions from the JAMB 2025 Physics paper, with answers, and explanations for 2 of them. Tap "Show answer" under each one when you are ready.

JAMB 2025Question 1 · Electricity and Magnetism

Two identical cells, each of emf

1.5 V

and internal resistance

1 Ω

, are connected in parallel to supply current to a

2 Ω

resistor. What is the total current?

A. $0.8 A$
B. $1.0 A$
C. $0.4 A$
D. $0.6 A$

Show answer

Answer: D. $0.6 A$

Equivalent emf $E_{e q} = 1.5 V$ (same as a single cell). Equivalent internal resistance $r_{e q} = \frac{1}{2} = 0.5 Ω$ (parallel). Total resistance $R_{t o t a l} = r_{e q} + 2 = 2.5 Ω$ . Current $I = \frac{E _{e q}}{R _{t o t a l}} = \frac{1.5}{2.5} = 0.6 A$ .

JAMB 2025Question 2 · Electricity and Magnetism

Three identical cells, each of e.m.f.

1.5 V

, are connected in series to form a battery, as shown above. What is the total e.m.f. of the battery?

A. $0.5 V$
B. $1.5 V$
C. $3.0 V$
D. $4.5 V$

Show answer

Answer: D. $4.5 V$

For identical cells connected in series, the total e.m.f. is the sum of the individual e.m.f.s: $1.5 + 1.5 + 1.5 = 4.5 V$ .

JAMB 2025Question 3 · Electricity and Magnetism

The emf of a cell is the potential difference across its terminals when it is in

A.series connection
B.closed circuit
C.open circuit
D.parallel connection

Show answer

Answer: C. open circuit

JAMB 2025Question 4 · Electricity and Magnetism

At what distance from a

1.2 \times 1 0^{- 7} C

point charge will the electric field intensity be equal to

4.8 \times 1 0^{- 4} NC^{- 1}

[Take \frac{1}{4 π ε _{0}} = 9.0 \times 1 0^{9}]

A. $1.5 Km$
B. $3.0 Km$
C. $2.0 Km$
D. $4.5 Km$

Show answer

Answer: A. $1.5 Km$

JAMB 2025Question 5 · Heat and Thermodynamics

The density of water is

1 g/cm^{3}

while that of ice is

0.9 g/cm^{3}

. Calculate the change in volume when

90 g

of ice is completely melted.

A. $9 cm^{3}$
B. $90 cm^{3}$
C. $0 cm^{3}$
D. $10 cm^{3}$

Show answer

Answer: D. $10 cm^{3}$

JAMB 2025Question 6 · Heat and Thermodynamics

A well-lagged thin metal rod of length

0.2 m

has a temperature gradient of

416 K m^{- 1}

. If one end is at

23 3^{\circ} C

, what is the temperature at the other end?

A. $141.2 0^{\circ} C$
B. $257.4 8^{\circ} C$
C. $408.6 0^{\circ} C$
D. $316.2 8^{\circ} C$

Show answer

Answer: D. $316.2 8^{\circ} C$

JAMB 2025Question 7 · Mechanics, Motion, and Energy

A hydraulic press consists of two cylinders of cross-sectional radius

r_{1}

and

r_{2}

. If a force of

200 N

applied to the smaller piston (

r_{1}

), causes a force of

3200 N

to be transmitted onto the larger piston (

r_{2}

). The ratio

r_{1} : r_{2}

is?

A. $1 : 4$
B. $1 : 2$
C. $1 : 8$
D. $1 : 16$

Show answer

Answer: A. $1 : 4$

JAMB 2025Question 8 · Mechanics, Motion, and Energy

A body is moving initially at

4 m/s

. If its impulse after accelerating at

5 m/s^{2}

for

2 s

60 Kgms^{- 1}

, what is its mass?

A. $3 Kg$
B. $4 Kg$
C. $6 Kg$
D. $5 Kg$

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Answer: C. $6 Kg$

JAMB 2025Question 9 · Nuclear and Modern Physics

One of the following is not a radiation detector

A.Electrophorus
B.Scintillation chamber
C.Geiger-Muller counter
D.Film badge

Show answer

Answer: A. Electrophorus

JAMB 2025Question 10 · Waves, Sound, and Optics

Calculate the depth of a swimming pool if the apparent depth is

10 cm

(refractive index of water is

1.33

)

A. $7.5 cm$
B. $10.0 cm$
C. $13.3 cm$
D. $6.87 cm$

Show answer

Answer: C. $13.3 cm$

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JAMB Physics Past Questions 2025

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