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Assertion: If two physical quantities have the same dimensions, then they can be certainly added or subtracted.

Reason: If the dimensions of both the quantities are same then both the physical quantities should be similar.

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Important Questions on Physical World and Measurement

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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 1
Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is 
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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 2

The dimensions of μ0∈0-1/2 is :

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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 3
The dimensins of (μ0ε0)-12 are : 
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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 4
If the dimensions of a physical quantity are given by MaLbTc, then physical quantity will be :- 
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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 5
The dimension of 12ε0E2, where ε0 is permittivity of free space and E is electric field, is:
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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 6
The density of material in CGS system of units is 4g cm-3. In a system of units in which unit of length is 10 cm and unit of mass is 100 g, the value of density of material will be :
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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 7
If force (F), velocity (v) and time (T) are taken as fundamental units, then the dimensions of mass is
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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 8
If energy (E), velocity (V) and time (T) are chosen as the fundamental quantities, the dimensional formula of surface tension will be___(For surface tension, Force=Surface tension×length)