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Units And Measurement

Question

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Define the unit of time in terms of mean solar day.

Solution

One second is equal to 1/86400 th part of a mean solar day.

The time between two successive passages of the mean sun across the meridian at noon. It is equal to24 hours 3 minutes and 56.555 seconds of mean sidereal time.

Some More Questions From Units and Measurement Chapter

What is the need of measurement?

Define physical quantity.

Give four examples of physical quantities.

Define unit.

What are the two main required characteristics of a unit?

Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

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