Physics

# If a quantity has no dimensions then,

It may have a unit

##### SOLUTION
A quantity has no dimension means that the quantity may be the ratio of same physical quantities. For example, the angular displacement is the ratio of lengths but it has some unit, called radian.

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Single Correct Medium Published on 18th 08, 2020
Questions 244531
Subjects 8
Chapters 125
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#### Realted Questions

Q1 Single Correct Hard
Out of the following the only pair that does not have identical dimensions is
• A. angular momentum and Planck's constant
• B. moment of inertia and moment of a force
• C. work and torque
• D. impulse and momentum

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q2 Single Correct Medium
A wire length of $l= 6\pm 0.06\ cm$ and radius $r= 0.5\pm 0.005\ cm$ and mass $m= 0.3\pm 0.003\ g$ Maximum percentage error is density is:
• A. $4\%$
• B. $2\%$
• C. $1\%$
• D. $6.8\%$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q3 Assertion & Reason Medium
##### ASSERTION

When percentage errors in the measurement of mass and velocity are 1% and 2% respectively, the percentage error in K.E. is 5%.

##### REASON

$\displaystyle \frac {\Delta K}{K}= \frac {\Delta m}{m}+ \frac {2\Delta v}{v}$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q4 Single Correct Medium
A wire of length $l=6\pm 0.06$cm and radius $r=0.5\pm 0.005$cm and mass $m=0.3\pm 0.003$ gm. Maximum percentage error in density is?
• A. $4$
• B. $2$
• C. $1$
• D. $6.8$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q5 Subjective Medium
The distance of a galaxy is $56 \times10^{25}m$. Assume the speed of light to be $3\times10^8 m s^{-1}$. Express order of magnitude of time taken by light travelled to the galaxy.

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020