1
KENDRIYA VIDYALAYA SANGHATHAN
CHANDIGARH REGION
CLASS-XI
SUBJECT-PHYSICS
Chapter -2
Units and Measurement
INDEX
, 2
S. No. CONTENT P. No.
1 Gist of the Chapter and Formulae Used 3-7
2 Multiple Choice Questions 8-13
3 Assertion Reasoning Questions 14-15
4 Case Study Based Questions 16-19
5 Answer key 20
, 3
GIST OF THE CHAPTER AND FORMULAE USED
Physical quantity
Fundamental and derived units
o S.I. units
o Dimensions
Application of Dimensional Analysis
o Limitations of Dimensional Analysis
Rounding off
Significant Figures
Order of Magnitude
Errors of Measurement
Propagation of Errors.
PHYSICAL QUANTITY
A quantity which can be measured and expressed in form of law is called a physical quantity.
Physical quantity (Q) = Magnitude x units = n x u
Where
n= numerical value,
u= unit
As the unit (u) changes, magnitude (n) will also change but product ‘nu’ will remain same.
i.e. nu = constant, or n1u1 = n2u2
S.I. system
It is known as international system of units. There are seven fundamental quantities in this
system.
KENDRIYA VIDYALAYA SANGHATHAN
CHANDIGARH REGION
CLASS-XI
SUBJECT-PHYSICS
Chapter -2
Units and Measurement
INDEX
, 2
S. No. CONTENT P. No.
1 Gist of the Chapter and Formulae Used 3-7
2 Multiple Choice Questions 8-13
3 Assertion Reasoning Questions 14-15
4 Case Study Based Questions 16-19
5 Answer key 20
, 3
GIST OF THE CHAPTER AND FORMULAE USED
Physical quantity
Fundamental and derived units
o S.I. units
o Dimensions
Application of Dimensional Analysis
o Limitations of Dimensional Analysis
Rounding off
Significant Figures
Order of Magnitude
Errors of Measurement
Propagation of Errors.
PHYSICAL QUANTITY
A quantity which can be measured and expressed in form of law is called a physical quantity.
Physical quantity (Q) = Magnitude x units = n x u
Where
n= numerical value,
u= unit
As the unit (u) changes, magnitude (n) will also change but product ‘nu’ will remain same.
i.e. nu = constant, or n1u1 = n2u2
S.I. system
It is known as international system of units. There are seven fundamental quantities in this
system.
