Question

Name the physical quantities which are measured in the ns.
A. Time.
B. Mass.
C. Length.
D. Temperature.

Answer 1

Hint: In this question, we will use some fundamentals of units and measurements. We have to find out the physical quantities whose unit is ns, where n is for nano and s is for second.

Complete Step-by-Step solution:
All those quantities which can 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.
Here we have ns, where n is nano, and s is for second.
The paris academy of sciences defined second as the time taken by the simple pendulum of one metre length to swing from one extreme position to the other.
So according to the definition of second, we can clearly see that second is the measurement of time.
That means time is measured in seconds.
Now, we know that n, nano is the abbreviation for powers of ten.
Nano = ${10^{ - 9}}$ and its symbol is n.
So ns = nanosecond = ${10^{ - 9}}$second, and this is also the measurement of time.
Hence we can say that the physical quantity, time is measured in ns.
Any other physical quantity is not related with second, so only time is that physical quantity which is measured in ns.
Therefore the correct answer is option (A).

Note: In this type of questions, we should have some basic knowledge of units and measurements. We have to know the symbol of the physical quantities and then we have to find out which physical quantity is measured by this unit. Through this we will get the answer.