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Choose the correct alternative (a), (b), (c) or (d) for each of the questions given below :
Which of the following is not a unit of time ?

A

light year

B

ns (nano second)

C

`mus` (micro second)

D

minutes

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "Which of the following is not a unit of time?", we need to analyze each of the provided options: 1. **Light year**: - A light year is defined as the distance that light travels in one year. It is a measure of distance, not time. 2. **Nanosecond**: - A nanosecond is one billionth of a second (10^-9 seconds). This is a unit of time. 3. **Microsecond**: - A microsecond is one millionth of a second (10^-6 seconds). This is also a unit of time. 4. **Minute**: - A minute is equal to 60 seconds. This is a standard unit of time. Now, we can summarize our findings: - **Option A (Light year)**: Not a unit of time (it measures distance). - **Option B (Nanosecond)**: A unit of time. - **Option C (Microsecond)**: A unit of time. - **Option D (Minute)**: A unit of time. Based on this analysis, the correct answer is: **Answer: (a) Light year**
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