CHAPTER – 1
PHYSICAL QUANTITIES AND MEASUREMENT
Q – 1 : What is science ? Why physical quantities and their measurements important for
scientists ?
Science :
“ The field of observation and experimentation to understand the world around us is known
as science “ .
The Physical World :
We are living in a physical world where we observe many natural phenomena and objects
around us , such as the Sun , stars , moon , oceans , plants , winds , rains , etc. People have
always been curious to know the reality of such happenings . This has led certain people to
investigate the facts and laws working in this world . Everything in our lives is closely linked
to science and the discoveries made by scientists .
Importance of Measurements :
In order to obtain reliable results from experiments , the primary thing is to make accurate
measurements . Physical quantities and their measurements have always been the matter
of interest for scientists . They have been investigating to improve the methods and
instruments for accurate measurements of physical quantities .
Q - 2: What are physical and non-physical quantities, and how are they different in terms of
measurement and application?
Physical and Non-Physical Quantities:
We describe various natural phenomena, events, and human behavior using some of their
features and terms such as love, affection, fear, wisdom, beauty, length, volume, density,
time, temperature, etc.
Physical Quantities:
"Physical quantities are measurable properties of material objects that can be expressed in
terms of a number and a unit".
Explanation:
