# 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