Question

Q50. Assertion : The speedometer of an automobile measures the average
speed of the automobile Reason-: Average speed is equal to total distance
divided by total time taken *
O
(a) Both assertion and reason are correct and reason is the correct explanation of
assertion
O
(b) Both assertion and reason are correct but reason is not the correct explanation of
assertion
O (C) Assertion is correct but reason is false
0 d
(d) Assertion is false but reason is true​

Answer 1

Explanation:

First of all, let's see the assertion given:

• The speedometer of an automobile measures the average speed of the automobile.

The above statement is incorrect × because Speedometer calculates the instatenous speed or speed of the automobile at that instant.

Now let's see the reason given:

• Average speed is equal to total distance divided by total time taken.

The above statement is correct in the sense that it is the definition or the formula for finding the average speed of the body.

Given,

Check out the options:

We have judged the assertion and came to the conclusion that it is incorrect because Speedometer doesn't calculate the average speed. So, assertion is incorrect. That means:

• A, B and C are not the correct options because it is given that assertion is correct in all these options.

So,

We are left with option D.

It is correct because assertion is incorrect and the statement given in reason is correct. Although, it is not explaining the assertion but we don't need to see that.

Correct answer is:

$\large{ \boxed{ \bf{ \red{Option \: D}}}}$

And, we are done !!

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Answer 2

Correct Question:- (Assertion and Reason)

Assertion: The speedometer of an automobile measures the average speed of the automobile.

Reason: Average speed is equal to total distance

divided by total time taken.

O Both assertion and reason are correct and reason is the correct explanation of

assertion

O Both assertion and reason are correct but reason is not the correct explanation of assertion

O Assertion is correct but reason is false

O Assertion is false but reason is true.

Answer:-

☑️ Assertion is false but reason is true.

Justification:

• Average speed is obtained by dividing total distance by total time taken. Thus, Reason is true.
• Speedometer is a machine used to measure the instant speed of an automobile. Thus, assertion becomes a false statement.
• Fact: Speedometer uses magnets to find the speed of the vehicles.