Physics

# A  dimensions quantity......................

may have a unit

##### SOLUTION

A dimensionless quantity has no dimensions but it may or may not have units. Two very common examples of dimensionless quantities are refractive index which does not have any units and angle which has units (degrees, radians).

So, the correct answer would be option(c).

You're just one step away

Single Correct Medium Published on 18th 08, 2020
Questions 244531
Subjects 8
Chapters 125
Enrolled Students 199

#### Realted Questions

Q1 Single Correct Medium
The physical quantities not having same dimensions are :
• A. torque and work
• B. momentum and Plancks constant
• C. stress and Youngs modulus
• D. speed and $\left( { \mu }_{ 0 }{ \epsilon }_{ 0 } \right) ^{ -1/2 }$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q2 Subjective Medium
The wavelength of light of a particular colour is 5800 $\mathring{A}$. What is its order of magnitude in meter?

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q3 Single Correct Medium
If we choose velocity V, acceleration A and force F as the fundamental quantities, then the angular momentum in terms of V,A and F would be :
• A. $[FA^{-1}V]$
• B. $[FV^{3}A^{-2}]$
• C. $[FV^{2}A^{-1}]$
• D. $[ML^2T^{-1}]$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q4 Single Correct Medium
The dimensions of universal gravitational constant are ___________.
• A. $\left[ { L }^{ 1 }{ M }^{ 0 }{ T }^{ 0 } \right]$
• B. $\left[ { L }^{ 2 }{ M }^{ 1 }{ T }^{ 0 } \right]$
• C. $\left[ { L }^{ -1 }{ M }^{ 1 }{ T }^{ -2 } \right]$
• D. $\left[ { L }^{ 3 }{ M }^{ -1 }{ T }^{ -2 } \right]$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q5 Single Correct Medium
What are the number of significant figures in the measurement $0.0040\times10^{-15}m$?
• A. 1
• B. 2
• C. 4
• D. 5

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020