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A : A unitless physical quantity must be...

A : A unitless physical quantity must be dimensionless.
R : A pure number is always dimensionless.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-UNITS AND MEASUREMENTS-EXERCISE- 1 B
  1. If you lok out of the window of a fast moving train the nearby trees, ...

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  2. A : PARSEC and light year, both measure time R : Both have dimension...

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  3. A : A unitless physical quantity must be dimensionless. R : A pure n...

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  4. A : Absolut error is unitless and dimensionless. R : All type of err...

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  5. A : Higher is the accuracy of measurement, if instrument have smaller ...

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  6. A : The maximum possible error in a reading is taken as least count of...

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  7. A : In a measurement, two readings obtained are 20.004 and 20.0004. Th...

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  8. A : Out of the measurements A = 20.00 and B = 20.000, B is more accura...

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  9. A : All physically correct equations are dimensionally correct. R : ...

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  10. A : Physical relations involving addition and subtraction cannot be de...

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  11. A : An exact number has infinite number of significant digits. R : A...

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  12. A : A dimensionless quantity may have unit. R : Two physical quantit...

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  13. If Q=(x^n)/(y^m) and Deltax, Deltay are absolute errors in the measure...

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  14. State true or false: A point has no dimensions.

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