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UTME 2025 Physics | Objective

Are you preparing for UTME exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2025 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

A solid suspended by a piece of string is completely immersed in water. On attempting to lift the solid out of the water, the string breaks when the solid is partly out of the water. This is because

A. the tension in the string decreases as the solid is lifted

B. the mass of the solid has increased

Correct C. the solid apparently weighs less when completely immersed in water than when partially immersed

D. part of the solid still in water is exerting more force on the string

E. the solid is no longer in equilibrium with water.

Correct Answer: C

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Question 2

The equivalent capacitance for the circuit drawn above is

A. \( 18 \mu \mathrm{f} \)

B. \( 4 \mu \mathrm{f} \)

C. \( 2 \mu \mathrm{f} \)

Correct D. \( 12 \mu \mathrm{f} \)

E. \( 13 \mu \mathrm{f} \)

Correct Answer: D

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Question 3

Two closed vessels contain equal volumes of boiling water and are identical except that one is blackened on the outside while the other is polished. Which of the following is correct?

A. The polished vessel will cool faster because a polished surface is a good radiator

B. The polished vessel will cool faster because it will absorb less heat from the room

C. The black vessel will cool faster because it is a better conductor of heat

D. The polished vessel will cool faster because it reflects heat better

Correct E. The black vessel will cool faster because a black surface radiates heat faster than a polished one.

Correct Answer: E

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Question 4

If the wavelength of a wave travelling with a velocity of \( 360 \mathrm{~ms}^{-1} \) is 60 m, the period of the wave is

A. 6 s

B. 3.6 s

Correct C. 0.17 s

D. 0.61 s

E. 3 s

Correct Answer: C

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Question 5

Which of the following statements on the use of X-rays is incorrect? X-rays are used

A. in hospitals to obtain photographs of tissues and bones in the body

B. for the treatment of malignant growths like cancer cells

Correct C. in detecting fingerprints

D. to reveal hidden flaws in metal castings and welded joints

E. to detect alterations which have been made to works of art.

Correct Answer: C

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Question 6

Which of the following statements is CORRECT?

A. Charges generated on glass rubbed with silk are called negative

B. Charges in various media can be carried by protons detached from their atoms.

Correct C. The magnitude of any charge is a multiple of the charge of an electron

D. The intensity of an electric field is a scalar quantity

E. If 500 joules of work are required to move a 2-coulomb charge between two points, the potential difference between the two points is 100 V.

Correct Answer: C

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Question 7

A balloon inflated with helium gas at ground level is released. As it rises through a constant temperature atmosphere.

A. its pressure reduces but volume remains constant

Correct B. the product of pressure and volume remains constant.

C. both pressure and volume increase.

D. its pressure remains constant but the volume decreases

E. both pressure and volume remain constant.

Correct Answer: B

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Question 8

An electric iron is rated at 1000 watts, 250 V. The corresponding maximum resistance and accompanying current is

A. 62.5 \(\mathrm{~A} \quad4.0 \Omega \)

B. 16.0\(\mathrm{~A} \quad 62.5 \Omega \quad \)

C. 62.5\(\mathrm{~A} \quad 16.0 \Omega \quad \)

Correct D. 4.0\(\mathrm{~A} \quad 62.5 \Omega \)

E. 4.0\(\mathrm{~A} \quad 250 \Omega \)

Correct Answer: D

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Question 9

In a resonance tube experiment, a tube of fixed length is closed at one end and several tuning forks of increasing frequency used to obtain resonance at the open end. If the tuning fork with the lowest frequency which gave resonance had a frequency \( \mathrm{f}_{1} \) and the next tuning fork to give resonance had a frequency \( \mathrm{f}_{2} \), find the ratio \( f_{2} / f_{1} \).

A. 8

Correct B. 3

C. 2

D. \( \frac{1}{2} \)

E. \( \frac{1}{3} \)

Correct Answer: B

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Question 10

A force varying linearly with the distance acts on a body. The work done on the body by the force during the first 10 metres of motion is

Correct A. 100 J

B. 150 J

C. 200 J

D. 300 J

E. 600 J

Correct Answer: A

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Question 11

A thin aluminium plate has a surface area of \( 1.500 \mathrm{~m}^{2} \) at \( 20C^\circ \). What will be its surface area when it is cooled to \( -20C^\circ \)? (Take the linear expansivity of aluminium to be \( 2.5 \times 10^{-5} \mathrm{~K}^{-1} \)).

A. \( 1.503 \mathrm{~m}^{2} \)

B. \( 1.500 \mathrm{~m}^{2} \)

C. \( 1.498 \mathrm{~m}^{2} \quad \)

Correct D. \( 1.497 \mathrm{~m}^{2} \quad \)

E. \( 1.490 \mathrm{~m}^{2} \).

Correct Answer: D

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Question 12

A wave of frequency 10 Hz forms a stationary wave pattern in a medium where the velocity is \( 20 \mathrm{cms}^{-1} \). The distance between adjacent nodes is

Correct A. 1.0 cm

B. \( 1.5 \mathrm{~cm} \quad \)

C. \( 2.0 \mathrm{~cm} \quad \)

D. 5.0 cm

Correct Answer: A

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Question 13

Calculate the amount of heat required to convert 2 kg of ice at \( -2^{\circ}C \) to water at \( 0^{\circ}C \). (Specific heat capacity of ice \( =2090 \mathrm{~J} \mathrm{~kg}^{-1} { }^{\circ}C^{-1} \). specific latent heat of fusion of ice \( =333 \mathrm{~kJ} \mathrm{~kg}^{-1} \) ).

A. 666 J

B. 8360 J

C. 666000 J

Correct D. 674360 J

Correct Answer: D

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Question 14

In the circuit diagram above, the ammeter reads a current of 3 amps, when R is 5 ohms and reads 6 amps when R is 2 ohms. The value of the unknown resistance \( X \) is

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 15

From the kinetic theory of gases. temperature is a

A. form of energy and is proportional to the total kinetic energy of the molecules.

B. form of energy and is proportional to the average kinetic energy of the molecules.

C. physical property and is proportional to the total kinetic energy of the molecules

Correct D. physical property and is proportional to the average kinetic energy of the molecules.

Correct Answer: D

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Question 16

When light is incident on an object which is magenta in colour, which of the following colours would be absorbed?

A. Red and blue

Correct B. Green only

C. Red and green

D. Red only

Correct Answer: B

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Question 17

To convert an alternating current dynamo into a direct current dynamo. the

A. number of turns in the coil is increased

B. strength of the field magnet is increased

Correct C. slip rings are replaced with a split ring commutator

D. coil is wound on a soft iron armature.

Correct Answer: C

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Question 18

PQRS is a rectangular cell with PQ perpendicular to the magnetic field as shown in the diagram. If a current flows in the direction PQRS, in what direction will the coil move?

Correct A. Upwards

B. Downwards

C. Towards the north pole

D. Towards the south pole

Correct Answer: A

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Question 19

Which of the following devices may be used to step up the voltage in a d.c. circuit?

A. A step-up transformer

B. A d.c. generator

C. A wattmeter

Correct D. An induction coil.

Correct Answer: D

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Question 20

The melting point of naphthalene is \( 78^{\circ}C \). What is this temperature in Kelvin?

A. 100 K

Correct B. 351 K

C. 378 K

D. 444 K

Correct Answer: B

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Question 21

Which of the following is required to convert a milliammeter to an ammeter?

A. A high resistance in parallel

B. A high resistance in series

Correct C. A low resistance in parallel

D. A low resistance in series.

Correct Answer: C

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Question 22

A liquid of mass \( 1.0 \times 10^{3} \mathrm{~kg} \) fills a rectangular tank of length 2.5 m and width 2.0 m. If the tank is 4 m high, what is the pressure at the middle of the tank? \( \left[\mathrm{~g}=10 \mathrm{~ms}^{-2}\right] \)

A. \( 1.0 \times 10^{+} \mathrm{Nm}^{-2} \quad \)

B. \( 2.0 \times 10^{3} \mathrm{Nm}^{-2} \)

C. \( 1.5 \times 10^{3} \mathrm{Nm}^{-2} \)

Correct D. \( 1.0 \times 10^{3} \mathrm{Nm}^{-2} \)

Correct Answer: D

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Question 23

An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because

Correct A. ebonite has a negative charge while glass has a positive charge

B. ebonite has a positive charge while glass has a negative charge

C. both have negative charges

D. both have positive charges.

Correct Answer: A

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Question 24

In semi-conductors, the carriers of current at room temperature are

A. electrons only

Correct B. electrons and holes

C. holes only

D. electrons and ions.

Correct Answer: B

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Question 25

The main reason for making the cover of a vacuum flask air tight is to prevent heat loss by

A. conduction

B. evaporation

C. radiation

Correct D. convection

Correct Answer: D

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