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(A): The magnitude of a physical quantit...

(A): The magnitude of a physical quantity does not change when the system of units is changed from S.I system to C.G.S system.
(R): The magnitude of a physical quantity is independent of system of units

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:
A
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AAKASH SERIES-UNITS AND MEASUREMENTS-EXERCISE- 1 B
  1. (A): The magnitude of a physical quantity does not change when the sys...

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  2. (A) : Increasing the number of observations minimizes random errors. ...

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  3. (A) : Dimensions of constant of proportionalities can be derived from ...

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  4. (A): Angular momentum and Plank's constant are dimensionally similar b...

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  5. (A): Solid angle is a dimensionless quantity and it is a supplementary...

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  6. (A) If you look out of the window of a fast moving train, the nearby t...

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  7. (A): Shake and light year, both measure time. (R): Both velocity and...

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  8. (A): A unitless physical quantity must be dimensionless. (R): A pure...

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  9. (A): Absolute error is unitless and dimensionless. (R): Errors are c...

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

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

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

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

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

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

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

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

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

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

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

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