Units and Dimensions – Exercise – 1

21. 100 watt hour =  …………… joule.

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

Answer
Answer : (a)
Explanation
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22. Wave length of light radiation 0.000015 m = ……………

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

Answer
Answer : (a)
Explanation
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23. Which of the following unit does not represent the unit of power ?

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

Answer
Answer : (a)
Explanation
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24. Light year is a unit of ……………

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

Answer
Answer : (d)
Explanation
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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
Answer : (c)
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