If you’re preparing for WAEC Physics, this collection of Most Repeated WAEC Physics Questions and Answers is designed to make your revision easier and more focused. It covers key topics like motion, force, energy, electricity, waves, and basic calculations that often appear in WAEC exams. The aim is to help you understand the common questions and how to answer them correctly during your exam.
Most Repeated physics WAEC Questions and Answers
A car accelerates uniformly from rest to a velocity of 20 m/s in 5 s. Its acceleration is
A. 2 m/s²
B. 4 m/s²
C. 5 m/s²
D. 10 m/s²
Answer: B
A body is projected vertically upward. At the highest point its velocity is
A. Maximum
B. Minimum but not zero
C. Zero
D. Increasing
Answer: C
The gradient of a velocity-time graph represents
A. Distance
B. Displacement
C. Acceleration
D. Momentum
Answer: C
A force of 10 N moves a body through 5 m in the direction of the force. The work done is
A. 2 J
B. 5 J
C. 50 J
D. 100 J
Answer: C
If the mass of a body doubles while velocity remains constant, its momentum
A. Remains same
B. Doubles
C. Halves
D. Becomes zero
Answer: B
A 2 kg object moving at 3 m/s has kinetic energy
A. 3 J
B. 6 J
C. 9 J
D. 18 J
Answer: D
When light passes from air into glass, it bends
A. Away from normal
B. Towards normal
C. Parallel to surface
D. Randomly
Answer: B
A real image is formed by a
A. Plane mirror
B. Convex lens
C. Concave lens
D. Flat surface
Answer: B
Most Repeated physics WAEC Questions and Answers
A ray of light incident at 30° to the mirror has angle of reflection
A. 30°
B. 60°
C. 90°
D. 0°
Answer: A
The resistance of a wire increases when its
A. Length decreases
B. Temperature decreases
C. Length increases
D. Area increases
Answer: C
Two resistors in series have equivalent resistance
A. Less than each resistor
B. Greater than either resistor
C. Equal to smaller resistor
D. Zero
Answer: B
In a parallel circuit, the voltage across each branch is
A. Different
B. Zero
C. Same
D. Alternating
Answer: C
The instrument used to detect small current is sensitive because it has
A. High resistance
B. Low resistance
C. No resistance
D. Infinite resistance
Answer: A
A transformer works on the principle of
A. Electrolysis
B. Electromagnetic induction
C. Friction
D. Resistance
Answer: B
In a step-up transformer, the secondary coil has
A. Fewer turns
B. More turns
C. Same turns
D. No turns
Answer: B
When a metal is heated, it expands because particles
A. Lose mass
B. Gain energy and move faster
C. Become heavier
D. Stop moving
Answer: B
Boiling occurs when vapour pressure equals
A. Atmospheric pressure
B. Density
C. Temperature
D. Mass
Answer: A
Evaporation is faster when surface area is
A. Reduced
B. Increased
C. Constant
D. Zero
Answer: B
Sound is loud when wave
A. Frequency is low
B. Amplitude is large
C. Speed is low
D. Wavelength is zero
Answer: B
Pitch of sound depends on
A. Amplitude
B. Frequency
C. Speed
D. Pressure
Answer: B
The phenomenon used in sonar is
A. Reflection of light
B. Reflection of sound
C. Refraction of light
D. Dispersion
Answer: B
A convex mirror always produces an image that is
A. Real and inverted
B. Virtual and diminished
C. Real and enlarged
D. Real only
Answer: B
A concave mirror forms a real image when object is placed
A. Between pole and focus
B. At focus
C. Beyond focus
D. At pole
Answer: C
In electrolysis, ions move towards electrodes due to
A. Gravity
B. Electric field
C. Heat
D. Pressure
Answer: B
During electrolysis of copper sulphate using copper electrodes, the cathode
A. Dissolves
B. Gains copper
C. Becomes lighter
D. Loses electrons only
Answer: B
Rusting of iron is faster in presence of
A. Dry air only
B. Oxygen only
C. Moist air
D. Vacuum
Answer: C
A moving charge produces
A. Only heat
B. Magnetic field
C. No field
D. Light only
Answer: B
The force on a current-carrying conductor in a magnetic field is greatest when angle is
A. 0°
B. 30°
C. 90°
D. 180°
Answer: C
A body floats when its density is
A. Greater than liquid
B. Less than liquid
C. Equal to zero
D. Infinite
Answer: B
Upthrust depends on
A. Mass only
B. Volume of displaced fluid
C. Temperature only
D. Weight only
Answer: B
Pressure in liquids increases with
A. Depth
B. Area
C. Volume
D. Shape
Answer: A
A satellite remains in orbit due to
A. Friction
B. Gravity and centripetal force balance
C. Air resistance
D. Heat
Answer: B
Most Repeated physics WAEC Questions and Answers
Escape velocity depends on
A. Shape of object
B. Mass of planet
C. Colour of object
D. Temperature
Answer: B
Radioactive decay is
A. Chemical change
B. Nuclear change
C. Physical change
D. Mechanical change
Answer: B
Half-life refers to time taken for half of
A. Mass to double
B. Radioactive nuclei to decay
C. Energy to increase
D. Temperature to fall
Answer: B
X-rays are used in medicine because they
A. Are visible
B. Penetrate soft tissue
C. Have no energy
D. Are sound waves
Answer: B
The green plant process that releases oxygen is
A. Respiration
B. Photosynthesis
C. Combustion
D. Fermentation
Answer: B
The image formed on a screen is always
A. Virtual
B. Real
C. Enlarged
D. Upright
Answer: B
Efficiency of a machine is always
A. More than 100%
B. Less than or equal to 100%
C. Zero
D. Infinite
Answer: B
A machine with velocity ratio 5 and efficiency 80% has mechanical advantage
A. 4
B. 5
C. 6
D. 8
Answer: A
Heat energy transfer without medium is
A. Conduction
B. Convection
C. Radiation
D. Evaporation
Answer: C
A thermos flask reduces heat loss mainly by preventing
A. Conduction only
B. Convection and radiation
C. Mass loss
D. Sound
Answer: B
When a wave enters a denser medium, its speed
A. Increases
B. Decreases
C. Becomes zero
D. Doubles
Answer: B
Refraction is caused by change in
A. Frequency
B. Speed of wave
C. Mass
D. Colour
Answer: B
The lens formula relates
A. Power and mass
B. Object distance, image distance and focal length
C. Speed and time
D. Force and distance
Answer: B
The current in a series circuit is
A. Divided
B. Same everywhere
C. Zero
D. Random
Answer: B
In a parallel circuit, total resistance is
A. Greater than largest resistor
B. Less than smallest resistor
C. Equal to sum
D. Infinite
Answer: B
A fuse works because of
A. High resistance wire melting
B. Low resistance wire cooling
C. Magnetic effect
D. Light emission
Answer: A
The principle behind electric motor is
A. Electrolysis
B. Magnetic effect of current
C. Heating effect
D. Chemical effect
Answer: B
The function of a capacitor is to
A. Produce heat
B. Store charge
C. Increase resistance
D. Produce sound
Answer: B
The slope of distance-time graph increasing means
A. Constant speed
B. Increasing speed
C. Zero motion
D. Negative motion
Answer: B
The unit of gravitational potential energy is
A. Watt
B. Joule
C. Newton
D. Pascal
Answer: B
A body at rest has
A. Kinetic energy only
B. Potential energy only
C. No energy
D. Both zero and non-zero energy possible
Answer: D
The energy transformation in generator is
A. Electrical to mechanical
B. Mechanical to electrical
C. Chemical to heat
D. Light to sound
Answer: B
Most Repeated physics theory Questions and Answers
1. Define velocity.
Velocity is the rate of change of displacement with time and has both magnitude and direction.
2. State Newton’s first law of motion.
A body remains at rest or continues in uniform motion in a straight line unless acted upon by an external force.
3. A car starts from rest and accelerates uniformly at 3 m/s² for 6 seconds. Calculate its final velocity.
Using v = u + at
u = 0, a = 3 m/s², t = 6 s
v = 0 + (3 × 6) = 18 m/s
Final velocity = 18 m/s
4. What is force?
Force is any interaction that can change the state of rest or motion of a body.
5. State the law of conservation of energy.
Energy cannot be created or destroyed but can be transformed from one form to another.
6. Define work.
Work is done when a force moves an object through a distance in the direction of the force.
7. What is power?
Power is the rate at which work is done or energy is transferred.
8. State Ohm’s law.
At constant temperature, the current flowing through a conductor is directly proportional to the potential difference across it.
9. A current of 2 A flows through a resistor of 6 Ω. Calculate the voltage across it.
Using V = IR
V = 2 × 6 = 12 V
Voltage = 12 V
10. What is pressure?
Pressure is the force acting per unit area.
11. State Archimedes’ principle.
A body immersed in a fluid experiences an upthrust equal to the weight of the fluid displaced.
12. Define momentum.
Momentum is the product of mass and velocity of a body.
13. What is a simple harmonic motion?
It is a type of motion in which the acceleration is directly proportional to the displacement from the equilibrium position and directed towards it.
14. A body of mass 4 kg moves with a velocity of 5 m/s. Calculate its momentum.
Using p = mv
p = 4 × 5 = 20 kg m/s
Momentum = 20 kg m/s
15. What is frequency?
Frequency is the number of oscillations or cycles per second.
16. State Hooke’s law.
Within the elastic limit, the extension of a spring is directly proportional to the applied force.
17. Define electric current.
Electric current is the rate of flow of electric charge.
18. What is refraction of light?
Refraction is the bending of light as it passes from one medium to another due to a change in speed.
19. A 10 kg object is lifted to a height of 5 m. Calculate its potential energy (g = 10 m/s²).
Using PE = mgh
PE = 10 × 10 × 5 = 500 J
Potential energy = 500 J
20. What is kinetic energy?
Kinetic energy is the energy possessed by a body due to its motion.
In conclusion, these most repeated WAEC Physics questions and answers should help you revise the important areas that frequently come out in exams. Take your time to understand the formulas and concepts behind each answer and practice them regularly. With steady preparation and consistency, you’ll build confidence and perform better in your WAEC Physics exam.
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