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What is the difference between a constant or a variable?

Important Questions on Units and Measurements

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Physics>Mechanics>Units and Measurements>Physical Quantities
The commutator bracket XY,Z is expanded as
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Physics>Mechanics>Units and Measurements>Physical Quantities
Which of the following is not a derived physical quantity?
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Consider a particle moving along the positive direction of X-axis. The velocity of the particle is given by v=αx (α is a positive constant). At time t=0, if the particle is located at x=0, the time dependence of the velocity and the acceleration of the particle are respectively.
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Physics>Mechanics>Units and Measurements>Physical Quantities

Match the following?

Column -I Column -II
(a) Conductance (i) Gray
(b) Magnetic Induction (ii) Lumen
(c) Absorbed dose (iii) Tesla
(d) Luminous flux (iv) Siemens

 

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Physics>Mechanics>Units and Measurements>Physical Quantities
Which physical quantity is measured by metre scale?
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Physics>Mechanics>Units and Measurements>Physical Quantities
Name the quantities which have no dimension but variable.
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Physics>Mechanics>Units and Measurements>Physical Quantities
(a) The unit of work and energy are ...............
(b) The unit of power is ...............
(c) The unit of energy per unit volume is ..........
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Physics>Mechanics>Units and Measurements>Physical Quantities
The unit of potential energy is_____.
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Physics>Mechanics>Units and Measurements>Physical Quantities
A new unit of length is chosen such that the speed of light in a vacuum is unity. What is the distance between the sun and the earth in terms of the new unit, if light takes 8 mins and 20 sec to cover this distance?
MEDIUM
Physics>Mechanics>Units and Measurements>Physical Quantities
Which of the following sets can't be taken as fundamental quantities in any system of units?
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Physics>Mechanics>Units and Measurements>Physical Quantities
Which one of the following is a fundamental quantity?
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Physics>Mechanics>Units and Measurements>Physical Quantities
Does ratio of same quantity depends upon the system of unit used?
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Physics>Mechanics>Units and Measurements>Physical Quantities
Assertion: Energy can be divided by volume.

Reason: Dimensions of energy and volume are different.
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Physics>Mechanics>Units and Measurements>Physical Quantities
Name the fundamental quantities in mechanics?
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Physics>Mechanics>Units and Measurements>Physical Quantities
Which of the following physical quantities has neither dimensions nor unit?
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Physics>Mechanics>Units and Measurements>Physical Quantities
What is a physical quantity? Name all the basic physical quantities.
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Physics>Mechanics>Units and Measurements>Physical Quantities
What are the fundamental quantities? Name them. 
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Physics>Mechanics>Units and Measurements>Physical Quantities
Light year is the unit of
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Physics>Mechanics>Units and Measurements>Physical Quantities
1 light year is equal to
MEDIUM
Physics>Mechanics>Units and Measurements>Physical Quantities
The square root of the product of inductance and capacitance has the dimension of