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WAEC 2022 Physics | Objective

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Question 1 View Details

The area under a force-time graph represents

A. change in kinetic energy.

Correct B. change in momentum.

C. work done.

D. change in internal energy.

Correct Answer: B

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Question 2 View Details

From the principle of flotation, a body sinks in a fluid until it displaces a quantity of fluid equal to its own

A. density.

B. mass.

Correct C. weight.

D. volume.

Correct Answer: C

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Question 3 View Details

Suppose three identical steel balls Q, R and S are placed on an undulating ground as illustrated in the diagram above. Which of the balls is/are in neutral equilibrium?

Correct A. S only

B. Q only

C. R only

D. Q and S only

Correct Answer: A

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Question 4 View Details

The length of a simple pendulum is increased by a factor of four. By what factor is its period increased?

A. 0.5 π

Correct B. 2

C. 2 π

D. 4

Correct Answer: B

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Question 5 View Details

The linear expansivity \( \alpha \), and cubic expansivity, \( \gamma \) of a material are related by the equation

A. \( \gamma=\alpha \)

Correct B. \( \gamma=3 \alpha \)

C. \( \gamma= 2 \alpha \)

D. \( \gamma=\frac{1}{3} \alpha \)

Correct Answer: B

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Question 6 View Details

Which of the illustrated graphs below represents a body moving with uniform retardation?

Question 7 View Details

The correct relationship between the displacement, \( s \), of a particle initially at rest in a linear motion and the time, \( t \), is

A. \( s \alpha t^{-2} \)

B. \( s \alpha t^{-1} \)

Correct C. \( s \alpha t \)

D. \( s \alpha \rho^{2} \)

Correct Answer: C

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Question 8 View Details

The Joule is equivalent to

A. \( k g m^{2} s^{-1} \)

B. \( k g^{2} m s^{-2} \)

Correct C. \( k g m^{2} s^{-2} \)

D. \( k g m s^{-1} \)

Correct Answer: C

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Question 9 View Details

Which of the following statement(s) is/are correct about a fixed mass of gas compressed in an inexpansible container? I. The average speed of the molecules increases. II. The temperature of the gas increases. III. The molecules hit the walls of the container more often than before the compression.

A. I only

B. I and II only

Correct C. I and III only

D. I. II and III

Correct Answer: C

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Question 10 View Details

An example of a mechanical wave is

Correct A. water waves,

B. radio waves.

C. X-rays.

D. light rays.

Correct Answer: A

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Question 11 View Details

Which of the following descriptions of the image formed by a plane mirror is not correct? The image is

A. erect and of the same size as the object.

B. laterally inverted and of the same size as the object.

Correct C. erect and bigger than the object.

D. virtual and of the same size as the object.

Correct Answer: C

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Question 12 View Details

The efficiency of a wheel and axle is \( 100 \% \) and the ratio of their radii is \( 5: 1 \). Calculate the effort required to lift a load of mass 20 kg using this machine. \( \left[g=10 m s^{-2}\right] \)

A. 20 N

B. 25 N

Correct C. 40 N

D. 100 N

Correct Answer: C

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Question 13 View Details

A freely suspended compass needle on the earth's surface settles in a plane called

A. geographic meridian.

Correct B. magnetic meridian.

C. magnetic declination.

D. isoganals.

Correct Answer: B

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Question 14 View Details

An object is placed at different distances, \( u \), from a converging lens of focal length, 15.0 cm. For what value of \( u \) does the lens act as a simple microscope?

A. \( u=15 c m \) only.

B. \( u=30 c m \) only

Correct C. \( u<15 c m \) only

D. \( u>30 \) cm only

Correct Answer: C

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Question 15 View Details

The periodic rise and fall in the intensity of sound produced when two notes of nearly equal frequencies are sounded together is called

A. doppler effect.

Correct B. beat.

C. interference.

D. resonance.

Correct Answer: B

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Question 16 View Details

The power of a lens is +2.5

A. 2.5 cm

B. 25.0 cm

Correct C. 40.0 cm

D. 80.0 cm

Correct Answer: C

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Question 17 View Details

The reason for having a large number of turns in the coil of a moving coil galvanometer is to

A. make the deflection of the needle proportional to the current.

Correct B. increase the sensitivity of the galvanometer.

C. decrease the magnetic flux produced by the magnet.

D. make the permanent magnet stronger.

Correct Answer: B

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Question 18 View Details

Current is passed through two parallel conductors in the same direction. If the conductors are placed near each other, they will

A. move in a circle.

B. repel each other.

C. remain stationary.

Correct D. attract each other.

Correct Answer: D

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Question 19 View Details

The period of a \( 10 k H z \) radio wave travelling at \( 3.0 \times 10^{8} m s^{-1} \) is

A. \( 3.0 \times 10^{-5} s \).

Correct B. \( 1.0 \times 10^{-4} s \)

C. \( 1.0 \times 10^{4} s \).

D. \( 3.0 \times 10^{4} s \).

Correct Answer: B

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Question 20 View Details

The magnetic material produced from the chemical combination of metal oxides and has a very high resistance to electric current is called a

Correct A. ferrite substance.

B. paramagnetic substance.

C. ferromagnetic substance.

D. diamagnetic substance.

Correct Answer: A

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Question 21 View Details

A body of mass, \( m \), moving with velocity, \( v \), has a wavelength, \( \lambda \), associated with it. This phenomenon is called

A. photoelectric effect.

B. Heisenberg's uncertainty principle.

C. Compton effect.

Correct D. wave-particle paradox.

Correct Answer: D

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Question 22 View Details

Which of the following statements about a straight current-carrying wire placed in a uniform magnetic field is correct? The wire experiences

A. maximum motor force if the current reverses its direction.

Correct B. no motor force if it is parallel to the field.

C. no motor force if it is perpendicular to the field.

D. a motor force with constant direction if either the current or the magnetic field is reversed.

Correct Answer: B

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Question 23 View Details

Three cells each of emf, 1.1 \( V \), and internal resistance, \( 2 \Omega \), are connected in parallel across a 3 resistor. Determine the current in the resistor.

A. 0.90 A

B. 0.39 A

Correct C. 0.30 A

D. 0.01 A

Correct Answer: C

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Question 24 View Details

Which of the following statements about electric potential energy is not correct?

A. The electric potential energy of a positively charged particle increases when it moves to a point of higher potential.

B. The electric potential energy of a negatively charged particle increases when it moves to a point of lower potential.

Correct C. The electric potential energy of a positively charged particle decreases when it moves to a point of higher potential.

D. The work done in taking a charged particle around a closed path in an electric field is zero.

Correct Answer: C

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Question 25 View Details

A galvanometer with a full scale deflection of \( 20 m A \) is converted to read \( 8 V \) by connecting a \( 395 \Omega \) resistor in series with it. Determine the internal resistance of the galvanometer.

A. 2.5 \( \Omega \)

Correct B. 5.0 \( \Omega \)

C. 8.0 \( \Omega \)

D. 10.0 \( \Omega \)

Correct Answer: B

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