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Physics Past Questions and Answers

Waec Physics Questions

Question 496:

Water boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of the mountain the

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A Saturation vapour pressure of water is higher than at sea-level
B Sun adds more heat to the water
C Temperature is lower than at sea- level
D Relative humidity of the atmosphere is lower
E Pressure of the atmosphere is lower

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Question 497:

The main reason why rice cooks faster in a pressure cooker than in cooking pot is that

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A Less heat escapes from the cooker
B The vapour pressure in the cooker is constant
C The rice is not affected by the draught over the cooker
D The vapour pressure in the cooker decreases
E The boiling point of water in the cooker is raised.

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Question 498:

In which of the following media would sound waves travel fastest?

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A Kerosine
B Alcohol
C Water
D Lron
E Air

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Question 499:

A ray of light strikes a plane mirror at a glancing angle of 50^o. Calculate the angle between the incident and reflected rays

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A 20^o
B 40^o
C 50^o
D 80^o
E 100^o.

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Question 500:

A boy walks away from a plane mirror at a speed of 3 ms-1 in a direction normal to the surface of the mirror. At what speed is his image approaching him?

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A 8 9.0ms^-1
B 6.0ms^-1
C 4.5ms^-1
D 1.5ms^-1
E 0.0ms^-1

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