MEDIUM
NEET
IMPORTANT
Earn 100

What are the dimensional formulae for the quantities having following units ?
(i) electron volt (ii) kWh

Important Questions on Units and Measurements

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IMPORTANT
Can we use dimensional method to find an expression for gravitational force acting between two objects of mass m1 and m2 ?
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IMPORTANT

The viscous force acting between liquid layers of area A is given as F=-ηAdvdx.

If dv has dimensions of speed and dx has dimensions of distance, find the dimensions of coefficient of viscosity η.

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IMPORTANT

Check the dimensional consistency of the following relation.

v=mgrη; where, v= Terminal velocity of a ball

r= Radius of the ball
g= Acceleration due to gravity
η= Coefficient of viscosity
m= Mass of ball

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IMPORTANT
What do you mean by measurement ? Explain why is it necessary.
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IMPORTANT
What is a system of units ? Discuss various popular system of units.
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IMPORTANT
Discuss in brief the various techniques employed to measure very small and very large distances. Will a distant star show greater parallax than a near star for the same basis ?
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IMPORTANT
What are the base units in SI ? Define the supplementary units and the quantities they measure.
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IMPORTANT
(i) Does a more accurate of the two values have greater precision too ? Explain with example.
(ii) What is the order of magnitude of a quantity ?