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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