Loading ...
FSc Online
Other
30410
3
Try Now
Log In
Pricing
UNIT 1 PHYSICAL QUANTITIES AND MEASUREMENT TEXTBOOK EXERCISE QUESTIONS 1.1Encircle the correct answer from the given choices. i. The number of base units in SI are: (a) 3 (b) 6 (c) 7 (d) 9 ii. Which one of the following unit is not a derived unit? (a) Pascal (b) kilogram (c) Newton (d) watt iii. Amount of a substance in terms of numbers is measured in: (a) Grams (b) kilogram (c) Newton (d) mole iv. An interval of 200µs is equivalent to: (a) 0.2 s (b) 0.02 s (c) 2 x 10-4 s (d) 2 x10-6 s v. Which one of the following is the smallest quantity? (a) 0.01 g (b) 2 mg (c) 100 µg (d) 5000 ng vi. A student claimed the diameter of a wire as 1.032 cm using vernier calipers. Up to what extent do you agree with it? (a) 1 cm (b) 1.0 cm (c) 1.03 cm (d) 1.032 cm vii. Significant figures in an expression are: (a) All the digits (b) All the accurately known digits (c) All the accurately known digits and the first doubtful digit (d) All the accurately known and all the doubtful digits 1.2: What is the difference between base quantities and derived quantities? Give three examples in each case. Base Quantities Derived Quantities The quantities on the basis of which other quantities are expressed are known as base quantities. Examples Length, time, mass Physical quantities which can be described in terms of base quantities are known as derived quantities. Examples Force, area, volume 1.3: Pick out the base units in the following: Joule, Newton, kilogram, hertz, mole, ampere, meter, Kelvin, coulomb and watt. Base units • Kilogram (unit of mass) • Mole (unit of quantity of substance) • Ampere (unit of electric current) • Meter (unit of length) • Kelvin (unit of temperature) 1.4: Find the base quantities involved in each of the following derived quantities: (a) Speed (b) Volume (c) Force (d) Work Ans. (a) Speed
