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JEE • PHYSICS • UNITS & MEASUREMENTS

Units & measurements practice · Easy

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 91-99 of 99 questions

91 Easy

91 of 99

Understanding +4 | -1

Dimensions of strain are

View answer and explanation

Correct option: D

{M^0}{L^0}{T^0}

Option D is correct because strain is defined as the ratio of change in dimension to the original dimension, making it a dimensionless quantity.

92 Easy

92 of 99

Understanding +4 | -1

Which of the following physical quantities has neither dimensions nor unit?

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Correct option: C

Coefficient of friction

Option C (Coefficient of friction) is correct because it is a ratio of two forces, making it dimensionless and unitless.

93 Easy

93 of 99

Analyzing +4 | -1

Which of the following pair of quantities do not have the same dimensions :

View answer and explanation

Correct option: C

Light year, time period

Option D (Train

P

exerts greater force on track) is correct because train P experiences a greater effective weight due to the Coriolis effect.

94 Easy

94 of 99

Application +4 | -1

\varepsilon_0

is the permittivity of free space and

E

is the electric field, then

\varepsilon_0 E^2

has the dimensions:

View answer and explanation

Correct option: B

\left[{M} {L}^{-1}{T}^{-2}\right]

Option B ([M][L]^-1[T]^-2) is correct because it represents the dimensions of energy density, which is equivalent to \

\varepsilon_0 E^2

95 Easy

95 of 99

Understanding +4 | -1

Statement-I: The equation

y=x+t

cannot be true where

x, y

are the distances and

t

is time
Statement-II: quantities with different dimensions can not be added

View answer and explanation

Correct option: A

Statement-I is true and statement-II is true

Option A (Statement-I is true and statement-II is true) is correct because the equation

y=x+t

is dimensionally incorrect, and quantities with different dimensions cannot be added.

96 Easy

96 of 99

Understanding +4 | -1

Henry/ohm can be expressed in

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Correct option: A

Second

Option A is correct because the ratio of inductance (Henry) to resistance (Ohm) has the dimensions of time (seconds).

97 Easy

97 of 99

Understanding +4 | -1

Assertion : Specific gravity of a fluid is a dimensionless quantity.

Reason : It is the ratio of density of fluid to the density of water.

View answer and explanation

Correct option: A

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

The correct answer is A (If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion) because specific gravity is a dimensionless ratio of densities.

98 Easy

98 of 99

Understanding +4 | -1

The dimensions of shear modulus are

View answer and explanation

Correct option: C

M{L^{ - 1}}{T^{ - 2}}

Option C is correct because shear modulus is defined as stress/strain, and its dimensions are

M{L^{ - 1}}{T^{ - 2}}

99 Easy

99 of 99

Understanding +4 | -1

Zero error in an instrument is a

View answer and explanation

Correct option: B

Systematic error

Option B (Systematic error) is correct because zero error is a consistent error associated with the instrument itself.

Revision notes and key takeaways

Review UNITS & MEASUREMENTS in your textbook or class notes, then use this set to check your understanding.

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