............ is the number of deaths in the population during a given period.
Natality
Mortality
Immigration
Emigration
B.
Mortality
Who discovered Uranus?
Sir Issac Newton
William Henry Fox Talbot
William Herschel
Nicolaus Copernicus
A change in which a substance undergoes a change in its physical properties is called ............
Chemical Properties
Physical Properties
Chemical Change
Physical Change
According to the Central Pollution Control Board (CPCB), particulate size .........micrometers or less in diameter are responsible for causing the greatest harm to human health.
0.5
2.5
5
10
The property of metal by which it can be drawn into wires is called ___________.
maleability
viscosity
ductility
tensile strength
A change in which no new substances are formed is called ...........
Physical Change
Chemical Change
Rusting
Galvanisation