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Q.

Name the physical quantities which are measured in the ns:

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a

Time.

b

Mass.

c

Length.

d

Temperature.

answer is A.

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Detailed Solution

Concept: All those quantities which may be measured directly and indirectly and in terms of which the laws of physics can be expressed are called physical quantities. Example: length, mass, temperature, speed etc.
Consistent with the definition of second, we will clearly see that second is the measurement of time.
That means time is measured in seconds.
Now, we all know that n, nano is the abbreviation for powers of ten.
Nano = 10−9 and the symbol of it is n.
So, ns = nanosecond = 10−9 second, and this is often also the measurement of time.
Hence, we will say that the physical quantity, time is measured in ns.
Hence, the correct option is 1.

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Name the physical quantities which are measured in the ns: