Measurement

Question 1

What is measurement?

Answer 1

measurementis the comparison of an unknown physical quantity with a known standard quality of the same kind.

Question 1

5 importance of measurement

Answer 1

1. it makes buying and selling goods easier
2. it helps to get accurate amount of physical quantities.
3. it is important in construction of roads, buildings, bridges, etc.
4. it is important to perform experiments in a science laboratory.
5. it is important in laboratories to get proper amount of medicines.

Question 2

physical quantities

Answer 2

those quantities which can be measured are known as physical quantities.

Question 3

fundamental/ basic quantities

Answer 3

the units which are independent of eachother are called fundamental/ basic quantities.

Question 4

types of physical quantities and its defination with examples

Answer 4

2 types: fundamnetal- the units which are independent of eachother are called fundamental/ basic quantities. examples: length, mas, time , tempreture, etc.

derieved- the physical quantities which are obtained by multiplying/ dividing 1/ more fundamental quantities are known as derieved quantities. examples: area, volume, speed, velocity, pressure, work , etc.

Question 5

derived units

Answer 5

the units which are obtained by multiplying/ dividing 1/ more fundamental units are known as derieved units.

Question 6

Mass and its SI unit

Answer 6

the total quantity of matter preent in a body is called the mass of the body. its SI unit is kilogram(kg)

Question 7

1 standard kilogram

Answer 7

it is defined as the mas of a platinum- iridium cylinder kept at 0 degree C at the international bureau of Weights &measures near paris in france.

Question 8

weight and its SI unit

Answer 8

the weight os the body is the gravity acting on a body and pulling it to the centre of the earth. its SI unit is Newton.

Question 9

time and its SI unit

Answer 9

time is defined as the duration between any two events. its SI unit second.

Question 10

one solar day

Answer 10

one mean solar day is defined as the time taken by earth to coplete one rotation around the sun about its axis.

Question 11

true or false? 
measurement is very important in our life.
physical quantities cannot be measured.
metre and kilogram are derived units.
mass is a constant quantity.

Answer 11

true
false
false
true

Question 12

which of the following is a fundamental quantity? 
area
mass
force
apeed

Answer 12

mass

Question 13

which of the following is a derieved unit?pascal
metre
kilogram
kelvin

Answer 13

pascal

Question 14

which physical quantity is measired by a spring balance?
mass
weight
volume
time

Answer 14

weight

Question 15

what is the SI unit of weight?
newton
kilogram
metre
pascal

Answer 15

newton