 WAEC GCE Physics Questions 2021 Objective & Theory Answers Update : Current School News

WAEC GCE Physics Questions 2021 Objective & Theory Answers Update

Filed in Exam, WAEC News on February 15, 2021

WAEC GCE Physics Questions 2021 Objective & Theory Answers Update.

WAEC GCE Physics Questions: Preparing for Physics in the upcoming WAEC GCE 2021 exam? Stay calm and go through the Physics WAEC GCE expo questions now available on our website. In this article, I will be showing you past WAEC GCE Physics random repeated questions for free. All you need to do is stay focus and follow this guide. The West African Examinations Council (WAEC) is an examination board that conducts the West African Senior School Certificate Examination, for University and Jamb entry examination in West Africa countries. In a year, over three million candidates registered for the exams coordinated by WAEC.

Randomly Asked WAEC GCE Physics Sample Questions

As usual, you will be given questions and options A to E to choose from. Normally, the number of objective questions (OBJ) you are to answer in WAEC GCE 2021 Physics Science is 50.

Objective (OBJ) Questions:

The Following are Sample WAEC GCE Objective Questions. They are likely Physics questions for WAEC GCE 2021:

1. The instrument to measure the relative density of light is
A. thermometer
B. hydrometer
C. spring balance
D. beaker

2. What is the speed of a body vibrating at 50 cyclic per second

3. The action of blotting paper on ink is due to
A. diffusion
B. osmosis
C. capillarity
D. surface tension

4. When two mirrors are placed at an angle of 900 to each other, how many images will be formed when an object is placed in front of the mirrors
A. 5
B. 4
C. 3
D. 2

5. If silicon is doped with phosphorus, what type of semiconductor material will be formed?
A. Zener material
B. P-n junction
C. n-type
D. p-type

6. A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is
A. 1 . 25 x 104 W
B. 2 . 50 x 104 W
C. 1 . 25 x 106W
D. 2 . 50 x 106 W

7. When the brakes in a car are applied, the frictional force on the tyres is
A. is a disadvantage because it is in the direction of the motion of the car
B. is a disadvantage because it is in the opposite direction of the motion of the car
C. is an advantage because it is in the direction of the motion of the car
D. is an advantage because it is in the opposite direction of the motion of the car

8. If the stress on a wire is 107NM-2 and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young’s modulus of the wire is
A. 5 . 0 x 104 Nm-2
B. 5 . 0 x 105 Nm-2
C. 2 . 0 x 108 Nm-2
D. 2 . 0 x 109 Nm-2

9. A solid weigh 10 .00 N in air, 6 N when fully immersed in water and 7 . 0 N when fully immersed in a liquid X. Calculate the relative density of the liquid, X.
A. 5/3
B. 4/3
C. 3/4
D. 7/10

10. When temperature of a liquid increases, its surface tension
A. Decreases
B. Increases
C. Remain Constant
D. Increases then decreases

11. A gas at a volume of V0 in a container at pressure P0 is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?
A. P0/5
B. 4P0/5
C. P0
D. 5P0

12. A piece of substance of specific head capacity 450JKg-1K-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms-2]
A. 2/9°C
B. 4/9°C
C. 9/4°C
D. 9/2°C

13. I. A liquid boils when its saturated vapour pressure is equal to the external pressure
II. Dissolved substances in pure water lead to increase in the boiling point.
III. When the external pressure is increased, the boiling point increases.
IV. Dissolved substances in pure water decrease the boiling point.

14. Which combination of the above are peculiarities of the boiling point of a liquid?
A. I, II and III
B. I, II, III and IV
C. I, II and IV
D. II, III and IV

15. The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20°C and 80°C respectively is
A. 3.0 x 102Km-1
B. 3.0 x 103Km-1
C. 5.0 x 103Km-1
D. 3.0 x 104Km-1

16. Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss;
Specific heat capacity of copper = 400JKg-1K-1
Latent heat of fusion of ice = 3.3 x 105JKg-1
A. 8/33kg
B. 33/80kg
C. 80/33kg
D. 33/8kg

17. A semiconductor diode is used in rectifying alternating current into direct current mainly because it
A. allows current to flow in either direction
B. is non-linear
C. offers a high input resistance
D. allows current to flow only in one direction

18. if ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆Px is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as
A. ∆x ∆Px ≥ h
B. ∆x ∆Px = 0
C. ∆x ∆Px < h
D. ∆x ∆Px = ∞

19. When a ship sails from saltwater into freshwater, the fraction of its volume above the water surface will
A. increase
B. decrease
C. remain the same
D. increase then decrease

20. I. Its velocity is constant
II. No work is done on the body
III. It has constant acceleration directed away from the centre
IV. The centripetal force is directed towards the centre

21. Which combination of the above is true of a body moving with constant speed in a circular track?
A. II and IV
B. I and IV
C. II and III
D. I and III

22. The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?
A. 20N
B. 30N
C. 40N
D. 50N

23. The instrument used to measure the pressure of a gas is
A. barometer
B. thermometer
C. hygrometer
D. manometer

24. A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due to gravity is 10ms−2−2 the power expended is
A. 100w
B. 200w
C. 400w
D. 500w

25. A radio station broadcast at a frequency of 600KHZ. If the speed of light in air is 3 × 108ms−1−1. Calculate the wavelength of the radio wave
A. 2.20 × 1033m
B. 5.0 × 1022m
C. 5.0 × 1055m
D. 11.8 × 101111m

26. Which of the following is a scalar quantity?
A. Tension
B. Weight
C. Impulse
D. Mass

27. Determine the focal length of a thin converging lens if the power is 5.0 dioptres
A. 0.1 m
B. 0.2 m
C. 2.0 m
D. 2.5 m

1. A particle is projected horizontally at 15ms-1 from a height of 20m.
Calculate the horizontal distance covered by the particle just before hitting the ground.
[g = 10 ms-2]
ANS: Let R represent the horizontal distance covered at time, t.
h = ½ gt2
20 = ½ x 10 x t2
t = 2s
R  = ut
=  15 x 2
= 30m

2. (a) Tate Faraday’s second law of electrolysis.
(b) An electric charge of 9.6 x 104 C liberates 1 mole of substance containing 6.0 x 1023 atoms.  Determine the value of the electronic charge.
ANS: (a) If the same quantity of electricity is passed through different  voltameters/electrolytes connected in series the masses of the substances liberated/deposited during electrolysis is (directly) proportional to their chemical equivalents.
(b) Let e represent the electronic charge.
=          9.6 x 104
6. 0. x 1023
=  1.60 x 10-19C

3. State three methods of polarizing an unpolarized light.

4. (a) State Faraday’s second law of electrolysis.
(b) An electric charge of 9.6 x 104 C liberates 1 mole of substance containing 6.0 x 1023 atoms. Determine the value of the electronic charge.
ANS: (a) The mass of an element deposited /liberated during electrolysis is (directly) proportional to the chemical equivalent of the element.
(b) Let e represent the electronic charge.
=  9.6 x104
6. 0. x 1023
=  1.60 x 10-19C

5. Explain the following terms:
(a) tensile stress;
(b) Young’s modulus.

6. (a) Define diffusion.
(b) State two applications of electrical conduction through gases.
ANS: (a) Diffusion is the process by which substances mix with one another due to the random motion of their molecules.
(b) Applications of electrical conduction through gases include:
– In the advertising industry/ Neon signs
– In lighting/ fluorescent tubes
– Identification of gases
– Cathode ray oscilloscope/ T.V. tubes.

7. (a) List two properties of cathode rays.
(b) Explain how the intensity and energy of cathode rays may be increased.
ANS: (a) Properties of cathode rays:
– They are negatively charged.
– travel in straight line in field free space.
– are deflected by electric/magnetic field.
– possess (kinetic) energy.
– possess momentum.
(b) The intensity of cathode rays may be increased by raising the temperature of the cathode /increasing the current through the heater.
They may be increased by raising the potential difference between the anode and the cathode/ the anode potential.

8. Give three observations in support of de Broglie’s assumption that moving particles behave like waves.

9. (a) Differentiate between plane polarization and interference as applied to waves.
(b) List two uses of polaroids.
ANS: (b) They are used in:
– production of 3-dimentional films
– determination of concentration of sugar solution
– polaroid cameras
– sunglasses.

10. (a) State two factors that affect the mass of elements deposited during electrolysis.
(b) List two non-electrolytes.
ANS: (a) time, current /quantity of charge, nature/ e.c.e of element.
(b) water, kerosene, petrol, benzene, ethanol.

DISCLAIMER! These are not real WAEC GCE Physics questions but likely repeated questions over the years to help candidate understand the nature of their examinations. Ensure to take note of every questions provided on this page.

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