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Physics Past Questions and Answers

Waec Physics Questions

Question 1916:

Which of the following cases cannot produce total internal reflection? A light ray travelling from

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A Glass to water
B Kerosene to air
C Air to water
D Water to ice

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Question 1917:

The vacuum in a thermoflask reduces heat loss resulting from

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A Radiation only
B Conduction and convection only
C Radiation and convection only
D Conduction only

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Question 1918:

The diagram above represents an experimental set-up for verifying

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A Lens formula
B Refraction laws
C Reflection laws
D Mirror formula

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Question 1919:

Which of the following statements about a moving object is correct?

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A When accelerating, the resultant force acting on it must be equal to zero.
B There must always be a non-zero resultant force acting on it.
C At a steady velocity, the resultant force acting on it must be equal to zero
D At a steady velocity, the air resistance must be equal to zero.

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Question 1920:

If the efficiency of a transformer is 100%, which of the following equations would be correct?

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A N\(_p\)E\(_p\) = N\(_s\)E\(_s\)
B N\(_s\)I\(_p\)= N\(_p\)I\(_s\)
C N\(_s\)I\(_s\) = N\(_p\)I\(_p\)
D I\(_p\)E\(_s\) = I\(_s\)E\(_p\)

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