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WAEC 2024 Physics | Objective

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Question 1 View Details

The vacuum and silvered surfaces of a vacuum flask walls are to respectively

Correct A. minimize conduction and convection and prevent radiation.

B. prevent conduction and convection and minimize radiation.

C. prevent conduction and minimize convection and radiation.

D. minimize conduction and prevent conduction and radiation.

Correct Answer: A

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Question 2 View Details

The magnitude of the acceleration of a moving object is equal to the

A. gradient of a displacement-time graph.

Correct B. gradient of a velocity-time graph.

C. area below a force-time graph.

D. area below a velocity-time graph.

Correct Answer: B

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Question 3 View Details

In which of the following states is maximum pressure exerted on a person?

A. Standing on two feet

Correct B. Standing on one foot

C. Lying on the floor

D. Kneeling on the floor

Correct Answer: B

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Question 4 View Details

What are cathode rays?

Correct A. Stream of electrons

B. Beam of neutrons

C. Beam of protons

D. Stream of alpha particles

Correct Answer: A

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Question 5 View Details

The capacitance of a parallel plate capacitor

A. decreases when the separation between the plates decreases.

B. increases when the potential difference between the plates is increased.

C. is greater without a dielectric between the plates than with dielectric.

Correct D. is greater with dielectric between the plates than without dielectric.

Correct Answer: D

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Question 6 View Details

The diagram above illustrates the motion of a cyclist from \( \mathbf{P} \) to \( \mathbf{R} \). The distance travelled is determined by the

A. area under QR.

Correct B. area under PQR,

C. gradient of PQR.

D. gradient of QR.

Correct Answer: B

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Question 7 View Details

A ray of light travels from a less dense medium to a denser medium. How are the speed and frequency of the light affected? The speed

A. increases and the frequency increases.

B. decreases and the frequency decreases.

C. increases and the frequency remains the same.

Correct D. decreases and the frequency remains the same.

Correct Answer: D

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Question 8 View Details

The function of a fuse in an electric circuit is to

Correct A. break the circuit when the current exceeds a certain value.

B. save energy by reducing the voltage.

C. ensure that the current in the circuit exceeds a certain value.

D. save energy by reducing the current.

Correct Answer: A

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Question 9 View Details

A body moves with uniform velocity when the resultant force on it is

A. greater than the frictional force acting on it.

B. less than the frictional force acting on it.

Correct C. equal to zero.

D. equal to unity.

Correct Answer: C

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Question 10 View Details

The law of conservation of momentum is stated for closed and isolated system. What are the two conditions for a system to be closed and isolated?

Correct A. No external force acts on the system and there is no change in mass of the system.

B. No external force acts on the system and there is a gain in mass.

C. No external force acts on the system and there is a loss in mass.

D. An external force acts on the system and there is no change in mass.

Correct Answer: A

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Question 11 View Details

A stone of mass 200 g attached to a string is made to revolve in a horizontal circle of radius \( 1.5 m \) at a steady speed of \( 5 m s^{-1} \). Calculate the tension in the string at the bottom of the circle. \( \left[g=10 m s^{-2}\right] \)

A. 5.3 N

Correct B. 3.3 N

C. 2.0 N

D. 1.3 N

Correct Answer: B

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Question 12 View Details

To convert a milli-ammeter to an ammeter, it is necessary to connect a resistor of

A. low value in series with it.

B. high value in series with it.

Correct C. low value in parallel with it.

D. high value in parallel with it.

Correct Answer: C

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Question 13 View Details

An object is placed 1.5 m from a plane mirror. How far is the image from the object?

Correct A. \( 3.0 m \)

B. \( 1.3 m \)

C. \( 1.0 m \)

D. \( 0.3 m \)

Correct Answer: A

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Question 14 View Details

Chromatic aberration in lenses can be corrected by using a combination of

Correct A. diverging and converging lenses.

B. an opaque material to cover the rims of lenses.

C. wide parallel beams on the lens's surface.

D. a thin convex lens.

Correct Answer: A

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Question 15 View Details

A cube of wood of side 10.0 cm floats vertically in water with 4.5 cm of its length submerged. Calculate the density of the wood. [Density of water = \( 1 \mathrm{gcm}^{-3} \)]

Correct A. \( 0.450 \mathrm{gcm}^{-3} \)

B. 0.203 gcm

C. \( 0.090 \mathrm{gcm}^{-3} \)

D. \( 0.045 \mathrm{gcm}^{-3} \)

Correct Answer: A

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Question 16 View Details

A temperature of 60 °C is equivalent to

A. \( 25^{B} \)

B. \( 50^{F} \)

C. \( 108^{F} \)

Correct D. \( 140^{F} \)

Correct Answer: D

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Question 17 View Details

All of the following uses are practical applications of \( x \)-ray except

A. the treatment of tumours.

Correct B. determining the depth of a mine.

C. dental operation.

D. detecting fracture in bones.

Correct Answer: B

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Question 18 View Details

Two isolated charged spheres each of magnitude \( +1.0 \times 10^{-6} C \) are separated by a distance of \( 2.0 \times 10^{-1} m \). Calculate the magnitude of the electrostatic force between them. \[ \left[K=\frac{1}{4 \pi \varepsilon_{0}}=9 \times 10^{9} \mathrm{Nm}^{2} \mathrm{c}^{-2}\right] \]

Correct A. \( 2.25 \times 10^{-1} N \)

B. \( 4.50 \times 10^{-1} N \)

C. \( 2.25 \times 10^{1} N \)

D. \( 4.50 \times 10^{1} N \)

Correct Answer: A

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Question 19 View Details

In the circuit diagram above, which lamp causes the other to go off?

Correct A. P

B. Q

C. R

D. S

Correct Answer: A

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Question 20 View Details

A particle of mass \( 3.6 \times 10^{-6} \mathrm{~kg} \) revolving around the earth has a radial acceleration of \( 4.3 \times 10^{7} m s^{-2} \). Calculate the centripetal force of the particle.

A. \( 6.25 \times 10^{-14} N \)

Correct B. \( 1.55 \times 10^{2} N \)

C. \( 1.00 \times 10^{2} N \)

D. \( 2.00 \times 10^{-2} N \)

Correct Answer: B

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Question 21 View Details

For a convex lens to form a real image, the distance between the object and the screen will be

A. equal to the focal length of the lens.

B. less than the focal length of the lens.

Correct C. twice the focal length of the lens.

D. four times the focal length of the lens.

Correct Answer: C

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Question 22 View Details

Use the circuit diagram below to answer question 22.   A constant voltage source supplies a sinusoidal alternating e.m.f. The voltage marked against the components are their peak values.

Determine the peak value of the applied e.m.f.

A. 1 V

B. 4 V

C. 5 V

D. 1

Correct Answer: E

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Question 23 View Details

A \( 2 \mu F \) capacitor is connected directly across a \( 150 V_{\text {rms }}, 60 \mathrm{~Hz} \) A . C source. Calculate the rms value of the current.

Correct A. \( 0.113 A \)

B. \( 0.160 A \)

C. \( 150 A \)

D. \( 1324 A \)

Correct Answer: A

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Question 24 View Details

A body of mass, m is projected vertically upward with a velocity, \( y \). At what position will the potential energy be maximum?

A. \( \frac{y^{2}}{g} \)

B. \( \frac{2 y^{2}}{g} \)

Correct C. \( \frac{y^{2}}{2 g} \)

D. \( \frac{y^{2}}{4 g} \)

Correct Answer: C

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Question 25 View Details

Light of energy \( 1.12 \times 10^{-18} \mathrm{~J} \) is incident on a metal of ejected electrons with maximum energy of \( 8.0 \times 10^{-19} \mathrm{~J} \). Calculate the threshold frequency of the metal, \( \left[h=6.626 \times 10^{-34} J s\right] \)

Correct A. \( 4.8 \times 10^{14} \mathrm{Hz} \)

B. \( 1.2 \times 10^{15} \mathrm{~Hz} \)

C. \( 1.7 \times 10^{15} \mathrm{~Hz} \)

D. \( 2.8 \times 10^{15} \mathrm{~Hz} \)

Correct Answer: A

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