Q130 / 180 · AIIMS 2015 · Physics

Assertion : The speedometer of an automobile measures the average speed of the automobile. Reason : Average velocity is equal to total distance divided by total time taken.

A
If both assertion and reason are true and reason is the correct explanation of assertion.
B
Ifboth assertion and reason are true but reason is not the correct explanation of assertion.
C
If assertion is true but reason is false.
Correct answer
D
If both assertion and reason are false.

Solution

The speedometer of an automobile measures the instantaneous speed of the automobile. $$ \text { Average velocity }=\frac{\text { Net displacement }}{\text { Time taken }} $$

Hence, the correct answer is option: 'D'.

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