Physics WAEC 2023 Past Questions (Objective & Theory)
Attempt this paper, then reveal the answers to mark yourself.
Section A — Objective
Question 1
Which of the following is a fundamental quantity?
A. Time
B. Speed
C. Force
D. Pressure
Answer: A. Time is a fundamental quantity. Speed, force and pressure are derived quantities.
Question 2
Momentum is the product of
A. Force and time
B. Mass and velocity
C. Mass and acceleration
D. Force and distance
Answer: B. Momentum p = mv (mass × velocity).
Question 3
The tendency of a body to resist a change in its state of motion is called
A. Inertia
B. Momentum
C. Friction
D. Gravity
Answer: A. Inertia is the tendency of a body to resist change in its state of motion (Newton’s first law).
Question 4
Sound travels fastest in
A. Solids
B. Liquids
C. Gases
D. A vacuum
Answer: A. Sound travels fastest in solids, then liquids, then gases, and cannot travel through a vacuum.
Question 5
The bending of light as it passes from air into glass is called
A. Reflection
B. Refraction
C. Diffraction
D. Dispersion
Answer: B. Refraction is the bending of light when it passes from one medium to another of different density.
Question 6
A force of 10 N moves a body through 5 m. The work done is
A. 50 J
B. 2 J
C. 15 J
D. 500 J
Answer: A. Work = force × distance = 10 × 5 = 50 J.
Section B — Theory
Question 1 — Theory
Distinguish between heat and temperature.
Answer: Heat is a form of energy that flows from a hotter to a colder body (measured in joules); temperature is the degree of hotness or coldness of a body (measured in degrees).
Question 2 — Theory
How much heat is required to raise 1 kg of water from 20 °C to 70 °C? (c = 4200 J/kg·K)
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