Exam Body

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Subject

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WAEC 2021 Physics | Objective

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Question 1 View Details

Which of the following quantities is not an example of force?

Correct A. Mass

B. Tension

C. Weight

D. Friction

Correct Answer: A

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Question 2 View Details

The reason for laminating the soft iron core of a transformer is to

Correct A. reduce eddy current.

B. reduce the magnetic flux.

C. increase the magnetic flux.

D. reduce its efficiency.

Correct Answer: A

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Question 3 View Details

Formation of hydrogen bubbles at the copper plate of a primary cell is called

Correct A. polarization.

B. back e.m.f

C. electrolysis.

D. local action.

Correct Answer: A

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Question 4 View Details

Which of the following factors does not affect the rate of evaporation of a liquid?

A. Temperature

Correct B. Volume

C. Wind

D. Surface area

Correct Answer: B

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Question 5 View Details

The opening in the eye through which light passes to the retina is called the

Correct A. pupil.

B. cornea.

C. iris.

D. optic nerve.

Correct Answer: A

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Question 6 View Details

A heat sensitive resistor made of a semiconductor is called a

A. thermometer.

B. thermostat.

Correct C. thermistor.

D. thermopile.

Correct Answer: C

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Question 7 View Details

Electric motor primarily converts

A. electrical energy to chemical energy.

B. kinetic energy to potential energy.

Correct C. electrical energy to mechanical energy.

D. electrical energy to heat energy.

Correct Answer: C

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Question 8 View Details

Which of the following statements about the molecules of solids and liquids is correct? They both

A. have weak attraction.

B. have wide separations.

C. exhibit random motion.

Correct D. exhibit vibratory motion.

Correct Answer: D

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Question 9 View Details

The distance between a node and its adjacent antinode of a transverse wave is equal to

Correct A. half of the wavelength.

B. the wavelength.

C. thrice the wavelength.

D. quarter of the wavelength.

Correct Answer: A

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Question 10 View Details

Which of the sketched graphs below illustrates the correct variation of the gravitational force, \( F_{g} \), between two objects and the distance, \( d \), between their centres?

Question 11 View Details

Which of the following actions will increase the capacitance of a parallel plate capacitor? I. Decreasing the distance between the plates II. Increasing the distance between the plates III. Increasing the area of the plates overlap IV. Avoiding the use of dielectric between the plates

Correct A. I and III only

B. II and III only

C. I and IV only

D. II and IV only

Correct Answer: A

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Question 12 View Details

A metallic sphere is heated from \( 27^{\circ} \mathrm{C} \) to \( 200^{\circ} \mathrm{C} \) without change of state. Which of the following changes would have resulted from the heating?

A. No changes occur in its volume and density

B. Its volume increases and its density increases

Correct C. Its volume increases and its density decreases

D. Its volume increases without a change in density

Correct Answer: C

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Question 13 View Details

The acceleration of a moving object can be determined from the

A. slope of its distance-time graph.

B. area under its distance-time graph.

Correct C. slope of its velocity-time graph.

D. area under its velocity-time graph.

Correct Answer: C

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Question 14 View Details

A student wishes to measure the potential difference across a resistor, R. She has a galvanometer, \( G \) and some connecting wires, what else does she need?

A. high value resistor connected in parallel with \( G \)

B. low value resistor connected in parallel with \( G \)

C. low value resistor connected in series with \( G \)

Correct D. high value resistor connected in series with \( G \)

Correct Answer: D

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Question 15 View Details

The handle of a screw jack is 35 cm long and the pitch of the screw is 0.5 cm. What force must be applied at the end of the handle to lift a load of \( 2000 N \) if the efficiency of the jack is \( 30 \% ?\left[\pi=\frac{22}{7}\right] \)

Correct A. 152.0 N

B. 132.0 \( N \)

C. \( 15.2 N \)

D. \( 440.0 N \)

Correct Answer: A

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Question 16 View Details

The inductive reactance in a circuit of frequency 100 Hz is \( 1 \Omega \). Calculate the inductance of the inductor. \( [\pi=3.14] \)

A. \( 2.00 \times 10^{-3} H \)

Correct B. \( 1.59 \times 10^{-3} \mathrm{H} \)

C. \( 1.09 \times 10^{-3} \mathrm{H} \)

D. \( 6.28 \times 10^{-3} \mathrm{H} \)

Correct Answer: B

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Question 17 View Details

The diagram above illustrates the velocity-time graph of a body. Calculate the distance covered by the body during the motion.

Correct A. 15 m

B. 84 m

C. 48 m

Correct Answer: A

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Question 18 View Details

Platom that emits an \( \alpha \)-particle

Correct A. may become a daughter of a different element.

B. becomes a different isotope of the element.

C. becomes a daughter with increased mass.

D. becomes a daughter of a different element.

Correct Answer: A

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Question 19 View Details

Which of the following units is equivalent to the unit of electric current?

A. Cs-3.

B. W

Correct C. \( \mathrm{Js}^{-1} \)

D. C.

Correct Answer: C

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Question 20 View Details

A ball is swung in a horizontal circle of centre O with a constant speed. What is the direction of its acceleration?

Correct A. Away from \( O \)

B. Along the circumference of the circle (Toward \( O \)

C. Along a tangent to the circle

Correct Answer: A

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Question 21 View Details

Which of the following statement is an effect of compressing gas molecules at constant temperature?

A. The pressure on the molecules decreases.

B. The molecules gain more kinetic energy.

Correct C. The molecules make more impact per second on the walls of the container.

D. The molecules increase in size.

Correct Answer: C

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Question 22 View Details

The diagram above is an illustration of an a.c. circuit. Calculate the reactance of the capacitor.

Correct A. 2016 \( \Omega \)

B. 2000 \( \Omega \)

C. \( 200 \Omega \)

D. \( 4000 \Omega \)

Correct Answer: A

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Question 23 View Details

A current of 2 A passes through a wire of resistance \( 4 \Omega \) for 3 minutes. Calculate the energy lost.

A. \( 960 J \)

B. \( 1440 J \)

Correct C. \( 2880 J \)

D. \( 48 J \)

Correct Answer: C

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Question 24 View Details

Which of the following statements about the universal gravitational constant, \( G \), is true?

A. It is a fundamental quantity.

B. It has dimensions \( \mathrm{M}^{-1} \mathrm{~L}^{3} \mathrm{~T}^{-2} \).

Correct C. Its S.I. unit is N \( \mathrm{m}^{2} \mathrm{~kg}^{-1} \).

D. It is a vector quantity.

Correct Answer: C

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Question 25 View Details

The sketched graph above represents a progressive wave moving from the left to the right. The period of the wave is 0.125 s. Determine the values of the amplitude and wavelength, respectively, of the wave.

Correct A. \( 8 \text{ cm}; 27 \text{ cm} \)

B. \( 8 \text{ cm} \); \( 9 \text{ cm} \)

C. \( 4 \text{ cm}; 9 \text{ cm} \)

D. \( 16 \text{ cm}; 27 \text{ cm} \)

Correct Answer: A

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