70
(Carrying 3 m
5
LONG-ANSWER TYPE [A]
1. Mention the various systems of units in use and
describe the SI system in detail.
2. Define the basic and supplementary units of the SI
system. What are the advantages of this system?
3. What are fundamental and derived units ? Give three
examples of derived units.
6
4. What do you understand by errors in measurement ?
Discuss random errors and systematic errors and their
1
Answers
Answer:
Q1 In most of the system,the mass,the length and the time are consider to be fundamental quantities and their units are called as fundamental units.The following are some system of units which are in common use.
Fundamental units:
1) Fundamental Quantity: Electric current.
2) S.I unit: Ampere.
3) symbol: A.
Q2 The base units and their physical quantities are the metre for measurement of length,the kilogram for mass,the second for time,the Ampere of electric current,the Kelvin of temperature,the candela for luminous intensity and the mole for amount of substances.supplementary units.
Q3 The units which are independent of each oher are know as fundamental. Derived units are derived from fundamental units.
For ex:
meter is a fundamental unit of length and is the fundamental unit of time.
Q3_Name. symbol. Expression in the term of
SI base units.
Joule per. J/m2. kg.s-2
kilogram. Kg.m2. m2.kg
Q4 Measurement error is a difference between a measured value of quantity and it's true value.