Teeth and Bones acquire strength and rigidity from

• fluorine

• chlorine

• sodium

• calcium

The type of tail found in Shark is

• homocercal

• heterocercal

• diphycercal

• protocercal

Alpha particle is the nucleus of an atom of

• hydrogen

• helium

• oxygen

• Ithium

Coating of solid waste with impervious material is known as

• chemical fixation

• landfill

• capping

• encapsulation

The concept of 'Green House Gases' was postulated by

• Joseph Furier

• Abdul Kalam

• M S Swaminathan

• Richael Carlson

The ordinary and maximum tolerance limit of sound by human being is

• 50 db to 70 b

• 60 db to 80 db

• 65 db to 75 db

• 70 db to 85 db

The pollutants which move downward with percolating groundwater are called

• Leachates

• Pollutates

• Earthites

• Percolates

118.

When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in

• Raman spectra

• Absorption spectra

• Emission spectra

• Fluroescence

A person can jump higher on the Moon's surface than on the Earth because

• the acceleration due to gravity in Moon is smaller than that on the Earth

• the Moon has no atmosphere

• the Moon's surface is rough

• the Moon is cooler than Earth

The purpose of choke in a fluorescent lamp is

• to decrease the current flow

• to decrease the voltage momentarily

• to decrease the resistance

• to increase the current flow