WAEC 2023 Physics | Objective

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Question 1 View Details
An instrument used to measure relative humidity is a
A. barometer.
B. hydrometer.
Correct C. hygrometer.
D. manometer.

Correct Answer: C

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Question 2 View Details
Which part of the human eye performs the same function as the diaphragm in a lens camera?
A. Choroid
Correct B. Iris
C. Cornea
D. Retina

Correct Answer: B

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Question 3 View Details
An electron moves from an energy level of \(-8.6 \mathrm{eV}\) to another level of \(-3.5 \mathrm{eV}\). Determine the frequency of the absorbed radiation. [\(1 ext{eV}=1.6 \times 10^{-19} J, h=6.6 \times 10^{-34} J s\)]
A. \(1.24 \times 10^{15} Hz\)
Correct B. \(2.93 \times 10^{15} Hz\)
C. 3.59 \times 10^{16} Hz
D. \(5.39 \times 10^{16} Hz\)

Correct Answer: B

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Question 4 View Details
A ball of mass 0.8 kg is dropped from a height, H. Just before hitting the ground, its velocity is \(5.0 \mathrm{ms}^{-1}\). Determine H. [\(g=10 \mathrm{ms}^{-2}\)]
A. \(1.25 m\)
B. 1.60 m
Correct C. \(4.00 m\)
D. \(6.25 m\)

Correct Answer: C

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Question 5 View Details
Which of the following statements about latent heat are correct? I. When ice melts, latent heat is absorbed II. When water freezes, latent heat is given off III. When water evaporates, latent heat is absorbed IV. When water vapour condenses, latent heat is absorbed
A. I and IV only
B. II and III only
Correct C. I, II and III only
D. II, III and IV only

Correct Answer: C

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Question 6 View Details
Increasing the frequency of a sound wave produces a sound with
A. longer wavelength
B. reduced loudness
Correct C. higher pitch
D. more overtones

Correct Answer: C

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Question 7 View Details
Which of the following diagrams correctly illustrates the mode of oscillation of air in a tube for the first overtone?
Question 8 View Details
In a mass spectrometer, an ion of charge, \(q\), and mass, \(m\), moving in a path of radius, \(r\), in a field of flux density, \(B\), has a speed of
Correct A. \(\frac{mr}{qB}\)
B. \(\frac{mq}{qr}\)
C. \(\frac{Bqr}{m}\)
D. \(\frac{mq}{Br}\)

Correct Answer: A

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Question 9 View Details
A sound of frequency 512 Hz reaches a listener \(100 m\) away. If the sound travels in air at s.t.p., what is its wavelength? [speed of sound in air = 331 \(m s^{-1}\)]
A. \(0.195 m\)
Correct B. \(0.646 m\)
C. 1.550 m
D. \(5.120 m\)

Correct Answer: B

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Question 10 View Details
In the Rutherford scattering experiment, a beam of alpha particles was fired at a thin gold film and few of the particles were deflected considerably. This shows that the nucleus of an atom
A. contains protons and electrons distributed in a tiny volume.
Correct B. is positively charged and is concentrated in a tiny volume.
C. is distributed in a tiny volume and emits alpha particles.
D. is concentrated in a tiny volume and contains alpha particles.

Correct Answer: B

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Question 11 View Details
A charge of \(10 C\) is transferred across a potential difference of \(220 V\). Determine the work done.
A. \(22 J\)
B. \(210 J\)
C. \(230 J\)
Correct D. \(2200 J\)

Correct Answer: D

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Question 12 View Details
A solenoid is constructed by winding an insulated copper wire on a long test tube. A constant direct current is passed through the solenoid. Which of the following actions will not increase the strength of the magnetic field of the solenoid?
A. Inserting a nickel rod in the test tube.
Correct B. Inserting a brass rod in the test tube.
C. Inserting a soft iron rod in the test tube.
D. Inserting a steel rod in the test tube.

Correct Answer: B

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Question 13 View Details
The following statements are advantages of a solid dielectric material between the plates of a capacitor except that
A. it keeps the plates at a fixed separation.
B. the maximum potential difference the capacitor can withstand is increased.
C. the capacitance of the capacitor of given dimensions is much greater than that of the plates in a vacuum.
Correct D. it increases the electrical conduction of the capacitor.

Correct Answer: D

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Question 14 View Details
Which of the following statements about a ferromagnetic material is correct? It
A. attracts non-magnetic materials.
B. has low relative permeability.
C. repels other magnetic materials.
Correct D. has a high susceptibility.

Correct Answer: D

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Question 15 View Details
A ball, P, is released from the roof of a building at the same time as another ball, Q, is thrown vertically upward from the base of the building. Which of the following statements is correct?
A. The acceleration of P is greater than that of Q and both are in the same direction.
Correct B. The acceleration of P is equal to that of Q and both are in the same direction.
C. The acceleration of P is equal to that of Q and are in opposite directions.
D. The acceleration of P is less than that of Q and both are in the same direction.

Correct Answer: B

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Question 16 View Details
A planet has mass, M, and radius R. If the universal gravitational constant is G, what is the expression for the escape velocity of an object on the planet?
A. \(\left(\frac{2 G}{R}\right)^{\frac{1}{2}}\)
B. \(\left(\frac{G R}{2}\right)^{\frac{1}{2}}\)
C. \(\left(\frac{G M}{R}\right)^{\frac{1}{2}}\)
Correct D. \(\left(\frac{2 G M}{R}\right)^{\frac{1}{2}}\)

Correct Answer: D

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Question 17 View Details
The specific latent heat of vaporization of lead is \(8.7 \times 10^{5} \mathrm{Jkg}^{-1}\). This means that \(8.7 \times 10^{5} J\) of thermal energy is required to change
A. 1 kg of molten lead to vapor at constant temperature and pressure.
Correct B. 1 kg of solid lead to vapor at constant temperature and pressure.
C. a given mass of molten lead to vapor at constant temperature and pressure.
D. 1 kg of molten lead to vapor for every degree rise in temperature.

Correct Answer: B

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Question 18 View Details
A 100 kg device is pulled up a plane inclined at 30° to the horizontal with a force of 1000 N. If the coefficient of friction between the device and the surface is 0.25, determine the total force opposing the motion. [\(g=10 \mathrm{ms}^{-2}\)]
A. 216.5 N
B. 283.5 N
Correct C. 716.5 N
D. 975.0 N

Correct Answer: C

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Question 19 View Details
Two objects, A and B, accelerate from rest at uniform rates, where B accelerates twice as much as
A. two times as far.
B. three times as far.
Correct C. six times as far.
D. at the same distance as A.

Correct Answer: C

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Question 20 View Details
The diagram above illustrates a hot metal suspended at the centre of a closed uniform box. Thermometers E, F, G and H are placed in contact with four sides of the box. Which of the thermometers would register the highest temperature?
A. E
B. F
C. G
D. H

Correct Answer: E

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Question 21 View Details
A liquid is left in an open dish. After several days, there is less liquid in the dish. Which of the following statements explains this observation?
A. most energetic molecules leave the surface and return.
Correct B. most energetic molecules leave the surface and escape into the air.
C. least energetic molecules leave the surface and return.
D. least energetic molecules leave the surface and escape into air.

Correct Answer: B

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Question 22 View Details
The colours of the visible light region of the electromagnetic spectrum that have the shortest and longest wavelengths respectively are
A. red and blue.
B. yellow and blue.
C. indigo and violet.
Correct D. violet and red.

Correct Answer: D

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Question 23 View Details
Which of the following equations is not a correct mirror formula? [The symbols have their usual meanings]
A. \(\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\)
Correct B. \(N=\frac{360}{\theta}-1\)
C. \(f=\frac{1}{D}\)
D. \(m=\frac{v}{u}\)

Correct Answer: B

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Question 24 View Details
An atom in an excited state is one whose
A. potential energy is minimum.
B. potential energy is maximum.
C. electrons are in the conduction band.
Correct D. electrons have moved to a higher energy level.

Correct Answer: D

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Question 25 View Details
The conclusive test for magnetism in a steel bar suspended horizontally at its midpoint is when the bar
Correct A. always settles in the magnetic N-S direction.
B. always settles in the magnetic E-W direction.
C. is repelled by a magnet.
D. is attracted by a magnet.

Correct Answer: A

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