WASSCE 2023: Physics Sample Questions(Part 3)

Let’s take a look at some sample questions of the 2023 WASSCE Physics which is set to be written on Monday, 11th September, 2023.

We have compiled some likely questions for all General Science students who will be writing Physics. These questions were selected based on some confirmed topics. Candidates should go through them and solve those without answers

1.What is the range of masses involved in the study of Physics?

a.  10^-19 kg to 10^38 kg
b.  10^-30 kg to 10^55kg
c.  10^-30 kg to 10^30kg
d. 10^-19 kg to 10^55 kg
Anss: B

2. What is the change in the angular momentum of a system as per the Law of Conservation of Angular momentum, if the total external torque acting is zero?

A. Remains constant
B.  Becomes zero
C. Increases exponentially
D.  None of the above
Ans: A.

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3. What is the apparent weight of the person when the elevator is accelerating downwards?
A. equal to the actual weight
B. greater than the actual weight
C. Less than the actual weight
D. 0

And: C

4. The inablity of a body to change its state of rest or motion is known as:
A. Force
B. Momentum
C. Displacement
D. Inertia

And: D.

5. What is the coefficient of restitution for a perfectly elastic collision?
A.  0
B. 1
C. -1
D. 100

And: B

Theory

(a) i. State two advantages of alcohol over mercury as a thermometric liquid.

ii. When the bulb of a thermometer is placed in a beaker of hot water, the level of mercury first falls and then rises gradually. Explain this observation.

(b) List two factors, other than temperature, that affect the rate of evaporation of a liquid.

(c) A block of lead of mass 100kg in a crucible and at a temperature of 40oC was placed in an electric furnace rated 10kW. If the melting point of lead is 320oC, calculate the:

(i) quantity of heat required to heat the lead to its melting point;

(ii) additional heat energy required to melt the lead;

(iii) time is taken to supply this additional energy. (Specific heat capacity of lead = 120JKg-1 K-1. (Specific latent heat of fusion of lead = 2.5 x 104 JK-1)

(d) State two precautions necessary in an experiment to determine the specific latent heat of vaporization of water.

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ANS

(a) i. Advantages of alcohol over mercury as a thermometric liquid
–  lower freezing point
–  cheaper
– easily expansively.
ii. the glass of the bulb of the thermometer first expands; hence the mercury level fails. The expansion of the mercury increases more than that of the glass and the liquid rises.

(b) Factors other than temperature affecting the rate of evaporation of a liquid
– wind
– humidity/ dryness of the air
–  nature of liquid/ viscosity /density
– the area of liquid exposed
–  pressure.