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Physics Past Questions and Answers

Waec Physics Questions

Question 91:

A block of ice at its melting point is left on a table in the atmosphere and observed to melt gradually. Which of the following statements is true about the melting process?

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A The reaction force of the table on the ice breaks the ice into water molecules
B Heat extracted from the ice block makes the ice block cold
C The ice block absorbs heat from the atmosphere and its temperature rises
D The atmosphere absorbs heat from the ice block and its temperature falls
E The ice block absorbs heat from the atmosphere and its temperature remains constant as it melts

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Question 92:

All the heat generated by a current of 2A passing through a resistor of 6Î© for 2.5s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?

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A 60 Jg^-1
B 120 Jg^-1
C 300 Jg^-1
D 360 Jg^-1
E 1500 Jg^-1

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Question 93:

Which of the following instruments can be used to compare the relative magnitudes of charges on two given bodies?

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A The electrophorous
B Ebonite rod
C Proof plane
D Gold leaf electroscope
E Capacitor

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Question 94:

A short chain is usual attached to the back of a petrol tanker trailing behind it to ensure that the

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A Petrol tanker is balanced on the wh eel
B Heat generated by friction in the engine can be conducted to the floor
C Charges generated by friction in the tanker can be conducted to the earth
D The tanker moves slowly as the chain touches the floor
E Chain produces sound for the resonance of the tanker engine

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Question 95:

A ray of light is incidence on a plane mirror at an angle of 35^o. What is the angle by the reflected ray with the surface of the mirror?

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A 125^o
B 70^o
C 65^o
D 55^o
E 35^o

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