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WAEC 2025 Physics | Objective

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Question 1 View Details

The diagram below illustrates a pulley system used to raise 10 kg load. If the effort \( F \) needed to raise the load is 70 N, calculate the efficiency of the machine \( \left[g=10 m s^{-2}\right] \)

Correct A. 20.0 %

B. 35.7 %

C. 50.0 %

D. 75.0 %

Correct Answer: A

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Question 2 View Details

The diagram below illustrates the force displacement of a body. Calculate the work done during the first 20 m of motion.

Correct A. 1000J

B. 825J

C. 750J

D. 500J

Correct Answer: A

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Question 3 View Details

The dispersion of light would result in which of the following phenomena?

Correct A. Eclipse

B. Shadow

C. Rainbow

D. Mirage

Correct Answer: A

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Question 4 View Details

The best colour of shirt to be worn on a bright noon day is?

Correct A. red

B. black

C. green

D. white

Correct Answer: A

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Question 5 View Details

The image found when an object is placed between the focus and centre of a converging lens is?

Correct A. real, inverted and magnified

B. real, inverted and diminished

C. erect, virtual and magnified

D. erect, virtual and diminished

Correct Answer: A

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Question 6 View Details

For a charged body moving in an electric and magnetic crossed field, the ratio of the electric field intensity, E to the magnetic flux density, B is known as?

Correct A. Lorentz ratio

B. Charge ratio

C. Velocity selector

D. Electrochemical equivalence

Correct Answer: A

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Question 7 View Details

A note, \( K \) from a keyboard has an amplitude of 0.5 cm and frequency 2000 \( H z \). Another note, \( M \) from a guitar has an amplitude of 1.5 cm and frequency \( 2000 H z \). Which of the following statements is true if the two notes are compared?

Correct A. \( K \) is louder than \( M \)

B. \( M \) is louder than \( K \)

C. \( M \) has a higher pitch than \( K \)

D. \( K \) and \( M \) have same timbre

Correct Answer: A

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Question 8 View Details

A simple pendulum of length 0.8m is set oscillating on a planet. If the pendulum completes 20 oscillations in 60s, calculate the acceleration due to gravity on this planet. \( [\pi=3.14] \)

Correct A. \( 2.5 m s^{-2} \)

B. \( 3.0 \mathrm{~ms}^{-2} \)

C. \( 3.5 m s^{-2} \)

D. \( 3.8 m s^{-2} \)

Correct Answer: A

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Question 9 View Details

A liquid of mass 2kg at 61 °C is kept in a lagged vessel. If another 2kg of the same liquid at \( 21^{\circ} C \) is added to the liquid in the vessel, calculate the final temperature of the mixture.

Correct A. 50°C

B. 41°C

C. 30°C

D. 15°C

Correct Answer: A

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Question 10 View Details

The diagram below indicates the current induced in a coil as a result of relative motion between it and a bar magnet. Which of the diagram illustrates the direction of the induced current.

Question 11 View Details

If two bodies, A and B are each in thermal equilibrium with another body C, then the three bodies are in thermal equilibrium with each other. This is statement of?

Correct A. zeroth law of thermodynamics

B. first law of thermodynamics

C. second law of thermodynamics

D. third law of thermodynamics

Correct Answer: A

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Question 12 View Details

A constant voltage source in the circuit below supplies a sinusoidal alternating e.m.f. the voltage marked against the components are the peak values. Determine the peak value of the applied e.m.f.

Correct A. 11.0V

B. 9.0V

C. 8.0V

D. 5.0 V

Correct Answer: A

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Question 13 View Details

A vibrator is used to generate ripples in a ripple tank. If the distance between two successive troughs is 3.5 cm and the wave travels a distance of \( 31.5 c m \) in \( 1.5 s \). calculate the frequency of the vibrator.

Correct A. \( 3.0 H z \)

B. \( 6.0 H z \)

C. \( 9.0 H z \)

D. \( 12.0 H z \)

Correct Answer: A

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Question 14 View Details

The speed of light in medium \( A \) of refractive index 1.5 is \( 2.0 \times 10^{8} m s^{-1} \). Determine the speed of light in medium \( B \) of refractive index is 1.2.

Correct A. 1.8 \times 10^{8} m s^{-1}

B. 2.5 \times 10^{8} m s^{-1}

C. 2.7 \times 10^{8} m s^{-1}

D. 3.0 \times 10^{8} m s^{-1}

Correct Answer: A

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Question 15 View Details

The wavelength of a sound note travelling with a speed of \( 360 m s^{-1} \) is \( 600 m \). Determine the period of the note.

Correct A. \( 60.000 s \)

B. \( 6.000 s \)

C. \( 1.667 s \)

D. \( 0.167 s \)

Correct Answer: A

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Question 16 View Details

In which of the following levers is the effort applied between the load and the fulcrum?

Correct A. pliers

B. wheelbarrow

C. sugar tongs

D. table knife

Correct Answer: A

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Question 17 View Details

The current passing through the \( 6 \Omega \) is \( 1.5 A \). Calculate the current in the \( 3 \Omega \) resistor.

Correct A. 1.20A

B. 0.90A

C. 0.75A

D. \( 0.60 A \)

Correct Answer: A

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Question 18 View Details

Calculate the terminal p.d. of the battery in the diagram.

Correct A. \( 7.20 V \)

B. 7.50 V

C. \( 10.80 V \)

D. 11.25 V

Correct Answer: A

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Question 19 View Details

Which of the statements is correct about the nucleus of an atom? It I. is centrally located in the atom II. contains the nucleons and electrons III. is positively charged due to the protons IV. decays when there is instability inside.

Correct A. I, II and IV only

B. I, III and IV only

C. I, II and III only

D. I and II only

Correct Answer: A

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Question 20 View Details

A radioactive element of mass 16 g was isolated and stored. It was discovered that after 40 days only \( 1 g \) of the element remained undecayed. Calculate the half-life of the element.

Correct A. 2.5days

B. 5.0days

C. 10.0days

D. 15.0days

Correct Answer: A

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Question 21 View Details

Which of the following reasons explains why the walls and ceilings of a standard concert hall are usually covered with perforated pads? To?

Correct A. increase the intensity of soundwaves

B. increase the loudness of sound waves

C. reduce the effect of reverberation of sound waves

D. decrease the frequency of sound waves

Correct Answer: A

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Question 22 View Details

A bucket of water of mass 10 kg is swung in a vertical circle of radius 1.2 m. While at the lowest position of the swing, its speed is \( 5.0 \mathrm{~ms}^{-1} \). Determine the tension in the string ( \( g=10 \left.m s^{-2}\right) \)

Correct A. 41.7 N

B. 141.7 N

C. 208.3 N

D. \( 308.3 N \)

Correct Answer: A

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Question 23 View Details

A man's near point is 30cm. Which of the following eye defects is the man likely to suffer from?

Correct A. hypermetropia

B. myopia

C. presbyopia

D. astigmatism

Correct Answer: A

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Question 24 View Details

White light can be produced by a combination of I. magenta, yellow and cyan II. red, blue and green III. magenta and green IV. yellow, red and green

A. II only

Correct B. I, II and III only

C. I and IV only

D. II and III only

Correct Answer: B

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Question 25 View Details

The diagram below shows a beam of light incident on a mirror. Such a mirror can be used as

A. surveillance mirror

Correct B. make-up mirror

C. reflector in microscope

D. depressing mirror

Correct Answer: B

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