Exam Body

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UTME 2021 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 2021 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

In the circuit diagram of a transistor above, the terminals $ \mathbf{P}, \mathbf{Q} $ and $ \mathbf{R} $ represent.

A. COLLECTOR, EMITTER and BASE.

Correct B. EMITTER, BASE and COLLECTOR.

C. BASE, EMITTER and COLLECTOR.

D. BASE, COLLECTOR and EMITTER.

Correct Answer: B

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Question 2

In photoelectric effect, which of the following graphs correctly represents the graph of stopping potential $ \mathbf{V}_{\mathbf{0}} $ against frequency $ f $ of incident light?

Question 3

The pair of physical quantities consisting of vectors only are

A. acceleration and speed.

B. velocity and distance.

Correct C. displacement and torque.

D. momentum and power.

Correct Answer: C

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Question 4

When the base current of a common-emitter transistor is kept at zero, it operates in the

A. active-on region.

B. breakdown region.

C. saturation region.

Correct D. cut-off region.

Correct Answer: D

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Question 5

The process through which free electrons leave the surface of hot metals is known as

A. electron emission

B. ionic emission

C. photon emission

Correct D. thermionic emission

Correct Answer: D

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Question 6

The diagram above represents the stress-strain graph for a typical metal rod. What does $ \mathbf{X} $ represent?

A. Yield point

Correct B. Breaking point

C. Elastic point

D. Proportional point

Correct Answer: B

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Question 7

At low humidity in an environment, the human skin is usually

A. dry and smooth.

B. damp and smooth.

C. damp and rough.

Correct D. dry and rough.

Correct Answer: D

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Question 8

The production of pure spectrum could easily be achieved using a

Correct A. triangular prism.

B. triangular prism with two concave lenses.

C. triangular prism with two convex lenses.

D. glass prism with a pin.

Correct Answer: A

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Question 9

The instrument used by designers to obtain different colour patterns is called

A. episcope.

Correct B. kaleidoscope

C. periscope.

D. sextant.

Correct Answer: B

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Question 10

During the nuclear reactions described by \[ { }_{92}^{235} \mathrm{~W} \rightarrow{ }_{93}^{235} \mathrm{X} \rightarrow{ }_{91}^{231} \mathrm{Y} \] the particles emitted are respectively

A. $ \beta $ and $ \beta $.

Correct B. $ \beta $ and $ \alpha $.

C. $ \alpha $ and $ \beta $.

D. $ \alpha $ and $ \alpha $.

Correct Answer: B

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Question 11

I. Mass II. Density III. Temperature IV. Nature of substance. Which of the above affect diffusion?

A. I, II and IV only.

Correct B. II, III and IV only.

C. I, II, III and IV.

D. I and II only.

Correct Answer: B

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Question 12

From the diagram above, the inductive reactance and the resistance R are respectively

Correct A. $ 10 \Omega $ and $ 50 \Omega. $

B. $ 20 \Omega $ and $ 50 \Omega .$

C. $ 25 \Omega $ and $ 51 \Omega $.

D. $ 50 \Omega $ and $ 45 \Omega $.

Correct Answer: A

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Question 13

Two spheres of masses 5.0 kg and 10.0 kg are 0.3 m apart. Calculate the force of attraction between them.

Correct A. 3.71 $ \times 10^{-8} \mathrm{~N} $.

B. 3.57 $ \times 10^{-2} \mathrm{~N} $.

C. 4.00 $ \times 10^{2} \mathrm{~N} $.

D. 3.50 $ \times 10^{-10} \mathrm{~N} $.

Correct Answer: A

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Question 14

The diagram above shows plank $ \mathbf{R S} $ pivoted at its centre of gravity $ \mathbf{O} $ and is in equilibrium with the weights $ \mathbf{P} $ and $ \mathbf{Q} $. If a weight $ 2 \mathbf{P} $ is added to $ \mathbf{P} $, the plank will be in equilibrium again by

Correct A. moving $ \mathbf{Q} $ nearer to $ \mathbf{O} $.

B. moving $ \mathbf{P} $ nearer to $ \mathbf{O} $.

C. adding a weight $ \mathbf{Q} $ to $ \mathbf{Q} $.

D. moving $ \mathbf{P} $ further away from $ \mathbf{O} $.

Correct Answer: A

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Question 15

If a body of mass 5 kg is thrown vertically upwards with velocity $ u $, at what height will the potential energy equal to the kinetic energy?

A. $ h=\frac{u^{2}}{g} $

B. $ h=\frac{u^{2}}{4 g} $

C. $ h=\frac{2 u^{2}}{g} $

Correct D. $ h=\frac{u^{2}}{2 g} $

Correct Answer: D

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Question 16

When cold water is poured on a can containing hot water, the can collapses because the

A. steam condenses and occupies the partial vacuum in the can.

B. external air pressure counterbalances the pressure within the can.

Correct C. external pressure becomes greater than the pressure within the can.

D. steam expands to occupy the vacuum remaining in the can.

Correct Answer: C

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Question 17

The diagram above is the heating curve for a solid. QR is

Correct A. melting region.

B. boiling region.

C. sublimation region.

D. evaporating process.

Correct Answer: A

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Question 18

An object placed at the bottom of a well full of clear water appears closer to the surface due to

A. diffraction.

B. reflection.

Correct C. refraction.

D. polarization.

Correct Answer: C

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Question 19

When a pure semiconductor is heated, its resistance

A. increases.

Correct B. decreases.

C. remains the same.

D. increases and then decreases.

Correct Answer: B

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Question 20

The values of x, y and z respectively in the expression $ \mathrm{M}^{*} \mathrm{~L}^{*} \mathrm{~T}^{*} $ for the universal gravitational constant G are

A. $ 2,-3,-2 $.

Correct B. $ -1,3,-2 $.

C. $ -1,2,-3 $.

D. $ -2,-1,3 $.

Correct Answer: B

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Question 21

Which of the diagrams below shows the position at which a small ball-bearing is in neutral equilibrium?

Question 22

I. Density of the liquid. II. Acceleration due to gravity III. Type of container of the liquid IV. The constituents of the liquid. Which of the above conditions will NOT affect the pressure of fluids?

A. I and III only

B. II and III only

Correct C. III and IV only

D. I and II only

Correct Answer: C

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Question 23

If a load of mass 10 N stretches a cord by 1.2 cm . what is the total work done?

Correct A. $ 6.0 \times 10^{-2} \mathrm{~J} $

B. $ 7.6 \times 10^{-2} \mathrm{~J} $

C. $ 1.8 \times 10^{-2} \mathrm{~J} $

D. $ 6.6 \times 10^{-2} \mathrm{~J} $

Correct Answer: A

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Question 24

The thermometer whose reading is indicated by a change in colour of its thermometric property is the

A. bi-metallic strip thermometer.

B. thermocouple.

C. platinum resistance thermometer.

Correct D. optical pyrometer.

Correct Answer: D

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Question 25

I. Moon II. Sun III. Street light IV. Stars Which of the above is a natural source of light

A. II, III and IV only

B. I, II and III only

C. III and IV only

Correct D. II and IV only

Correct Answer: D

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