Q18 VSA of 44 Page 7

Which of the following are not a unit of time?

Second – It is a unit of time.


Parsec – It is a unit of distance which is equal to 3.26 light year.


Year – It is a unit of time which is equal to 31536000 seconds.


Light year- It is a unit of distance. It is defined as distance covered by light in 1 year. i.e.


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16

If Planck’s constant (h ) and speed of light in vacuum (c ) are taken as two fundamental quantities, which one of the following can, in addition, be taken to express length, mass and time in terms of the three chosen fundamental quantities?

 17

Which of the following ratios express pressure?

 19

Why do we have different units for the same physical quantity?

 20

The radius of atom is of the order of 1 Å and radius of nucleus is of the order of Fermi. How many magnitudes higher is the volume of atom as compared to the volume of nucleus?