# Units and Dimensions – Exercise – 1

Exercise – 1

1. Which of the following is the smallest one in magnitude ?

(a) one metre
(b) one millimetre
(c) one fermi
(d) one angstron unit

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2. Planck’s constant has the dimensions of :

(a) Power
(b) Electric charge
(c) Angular momentum
(d) Linear momentum

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3. A watt is equal to :

(a) 418 calorie per second
(b) 1 joule per second
(c) 4.18 joule per second
(d) 1/418 joule per second

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4. A dimensionless quantity :

(a) Never has a unit
(b) Always has a unit
(c) May have a unit
(d) Does not exist

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5. A unitless quantity :

(a) never has a nonzero dimension
(b) always has a nonzero dimension
(c) may have a nonzero dimension
(d) does not exist

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