Posted by Download Now! WAEC Physics Theory or Essay Question and Answers
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Table of Contents
WAEC Physics Theory Questions and Answers
SECTION B
ESSAY
1 1/2 Hours
[ 60 marks ]
Answer eight questions in all.
Five questions from Part I and three questions from Part II.
.
WAEC Essay Questions Part I
PART I
[15 marks]
Answer any five questions from this part.
All questions carry equal marks.
.
1. (a) Define strain.
(b) A rubber band is stretched to twice its original length.
Calculate the strain on the rubber band.
.
2. State three materials used for making optical fibres.
.
3. Name three classes of magnetic materials.
.
4.(a) What is an intrinsic semiconductor?
(b) Distinguish between the p-type and n-type semiconductors.
.
5.
6. A black body radiates maximum energy when its surface temperature T and the corresponding wavelength λmax are related by the equation, λmax T = constant. Given the values of the constant and surface temperature as 2.9 x 10-3 mK and 570C respectively,
Calculate the frequency of the energy radiated.
7. (a) What does the acronym LASER stand for?
(b) What is a laser?
WAEC Theory Questions Part II
PART II
[45 marks]
Answer any three questions from this part.
All questions carry equal marks.
8(a) Define uniform acceleration,
(b) Forces act on a car in motion, list the:
(i) horizontal forces and their directions;
(ii) vertical forces and their directions,
(c) A car starts from rest and accelerate uniformly for 20s to attain a speed of 25 ms-1.
It maintains this speed for 30s before decelerating uniformly to rest.
The total time for the journey is 60 s.
(i) Sketch a velocity-time graph for the motion,
(ii) Use the graph to determine the:
(α) total distance travelled by the car;
(β) deceleration of the car.
(d) The figure here illustrates force-extension graph for a stretched spiral spring. Determine the work done on the spring [download document below to see the image]
.
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9. (a) List two factors each that affect heat loss by:
(i) radiation; (ii) convection,
(b)State two factors that determine the quantity of heat in a body.
(c)Explain the statement: The specific latent heat of vaporization of mercury is 2.72 x 105Jkg1.
(d)A jug of heat capacity 250 J kg-1 contains water at 28°C
An electric heater of resistance 35Ω connected to a 220 v source is used to raise the temperature of the water until it boils at 100°C in 4 minutes.
After another 5 minutes, 300 g of water has evaporated. Assuming no heat is lost to the surroundings, calculate the:
(i) Mass of water in the jug before heating;
(ii) Specific latent heat of vaporization of steam.
[Specific Heat Capacity of Water = 4200 Jkg-1 K-1]
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