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(A): Physical relations involving additi...

(A): Physical relations involving addition and subtraction cannot be derived by dimensional analysis.
(R) Numerical constants cannot be deduced by the method of dimensions.

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

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  2. (A) : The maximum possible error in a reading is taken as least count ...

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  3. (A) : In a measurement, two readings obtai- ned are 10.001 and 10.0001...

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  4. (A): Out of the measurements A = 10.00 and B = 10.000 B is more accura...

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  5. (A): All physically correct equations are dimensionally correct. (R...

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  6. (A): Physical relations involving addition and subtraction cannot be d...

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  7. (A) : An exact number has infinite number of significant digits. (R...

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  8. (A): A dimensionless quantity may have unit. (R) : Two physical quan...

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  9. If x=(a^m.b^(n))/(c^(p).d^(q)) then the percentages error in the meas...

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  10. (A) : Dimensionless quantities have no units. (R): Unitless quantit...

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  11. (A): Ampere is a standard unit of electric current. (R): It is indep...

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  12. (A): The distance of a star from earth can be measured by parallax met...

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  13. (A) : A unitless quantity cannot have a dimensional formula. (R): A...

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  14. (A): A measurement which is less accurate is more precise. (R): Prec...

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  15. (A): Systametic errors are due to a definite cause and can be minimise...

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  16. (A): When an algebraic equation has been derived, it is advisible to c...

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  17. (A): The order of accuracy of a measurement depends on the least count...

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  18. (A): The method of dimensions cannot be used to obtain the dependence ...

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  19. (A) : Mass, Volume and time may be taken as fundamental quantities in ...

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  20. (A): The method of dimensions cannot be used to derive the formula N=N...

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