21. 100 watt hour = …………… joule.

(a) 3.6 10^{5} J

(b) 3.6 10^{6} J

(c) 36 10^{5} J

(d) 36 10^{6} J

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

(a) 15 micron

(b) 1.5 micron

(c) 150 micron

(d) 0.15 micron

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

24. Light year is a unit of ……………

(a) Mass

(b) Volume

(c) Density

(d) Distance

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

(a) kg m^{–1} sec

(b) N m sec^{–1
}(c) N m^{2} kg^{–2
}(d) N m kg^{–1}

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