2023 WASSCE: Likely Physics Questions And Answers
The 2023 WASSCE is set to begin on Monday, 31st July, 2023. Physics theory and objectives paper will be written on Monday, 11th September, 2023.
Physics Paper 3(Practicals) will be written on 30th August, 15th September and 25th September, 2023, depending on the alternative.
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. a) State Faraday’s second law of electrolysis.
(b) An electric charge of 9.6 x 104 C liberates 1 mole of a 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.
e = Faraday’s constant
Avogadro’s number
= 9.6 x104
6. 0. x 1023
= 1.60 x 10-19C
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2. (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 advertising industry/ Neon signs
– In lighting/ fluorescent tubes
– Identification of gases
– Cathode ray oscilloscope/ T.V. tubes.
3. (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
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4. (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-dimensional films
– determination of the concentration of sugar solution
– polaroid cameras
– sunglasses
5. (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.
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.
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