Units and Dimensions » 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
2. Planck’s constant has the dimensions of :
(a) Power
(b) Electric charge
(c) Angular momentum
(d) Linear momentum
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
4. A dimensionless quantity :
(a) Never has a unit
(b) Always has a unit
(c) May have a unit
(d) Does not exist
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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