The study of population is known as

• hydrology

• demography

• climatology

• petrology

'Shock-absorbers' are usually made of steel as it

• is not brittle

• has lower elasticity

• has higher elasticity

• has no ductile property

The time period of a pendulum when taken to the Moon would

• remain the same

• decrease

• become zero

• increase

The atmospheric air is held to the Earth by

• gravity

• winds

• clouds

• rotation of the Earth

The constituents of automobile exhaust that can cause cancer is/are

• Oxides of nitrogen

• Carbon monoxide

• Polycyclic hydrocarbons

• Lead

Which of the following could be used as fuel in propellant or rockets?

• Liquid Hydrogen + Liquid Nitrogen

• Liquid Oxygen + Liquid Argon

• Liquid Nitrogen + Liquid Oxygen

• Liquid Hydrogen + Liquid Oxygen

The addition of gypsum to portland cement helps in

• increasing the strength of cement

• rapid setting of cement

• preventing rapid setting of cement

• reduction in the cost of cement

White lung disease is prevalent among the workers of

• Paper Industry

• Cement Industry

• Cotton Industry

• Pesticide Industry

139.

The Refrigerant 'FREON' is

• Calcium Tetra Fluoride

• Difluoro Dichloro Methane

• Fluorspar and Felspar

• Hydrofluosilicic Acid

Among the following materials sound travels fastest in

• steel

• air

• vacuum

• water