Units & Dimensions – 1 – 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

ANSWER

EXPLANATION

2. Planck’s constant has the dimensions of :

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

4. A dimensionless quantity :

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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