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Units and Dimensions – 1 – 5

21. 100 watt hour =  …………… joule.

(a) 3.6 105 J  
(b) 3.6 106 J  
(c) 36 105 J  
(d) 36 106 J  

ANSWER

EXPLANATION

22. Wave length of light radiation 0.000015 m = ……………

(a) 15 micron
(b) 1.5 micron
(c) 150 micron
(d) 0.15 micron

ANSWER

EXPLANATION

23. Which of the following unit does not represent the unit of power ?

(a) ampere/volt
(c) (ampere)2 x ohm
(c) joule/second
(d) ampere x volt

ANSWER

EXPLANATION

24. Light year is a unit of ……………

(a) Mass
(b) Volume
(c) Density
(d) Distance

ANSWER

EXPLANATION

25. Unit of universal gravitational constant is ……………

(a) kg m–1 sec
(b) N m sec–1
(c) N m2 kg–2
(d) N m kg–1

ANSWER

EXPLANATION

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