The salinization can be defined as -

• Absorption and

  re-emission of ultraviolet radiations by the atmosphere

• Absorption and

  re-emission of infrared radiations by the atmosphere

• Absorption and

  re-emission of visible light by the atmosphere

• None of the above

The main reason for blueness of the sky is -

• Due to the presence of water vapor

• Due to the absorption of blue light due to the air

• Due to the scattering of sunlight by air molecules

• None of the above

What is the water vapor?

• It is the gaseous phase of water

• It is a rain droplet

• Water vapor is the cloud droplet

• None of the above

Which of the following is the cause of Melanornia (skin cancer)?

• Acid rain

• Allergens

• Ozone depletion

• None of the above

At what time of the day relative humidity in the environment is at minimum?

• When the air temperature is lowest

• Before sunrise

• Midnight

• When the air temperature is higher

Which of the following gas is present in the air in maximum amount?

• Nitrogen

• Oxygen

• Carbon dioxide

• Methane

Which of the following is said to be a biodegradable waste?

• Plastics

• Glasses

• Eggshell

• Polythene

Sugar is a form of -

• Carbohydrate

• Fat

• Protein

• Water

Which of the following has a maximum speed?

• Light

• Air

• Sound

• Water current

The mosquito repellent that is used in the homes in the form of a coil, liquids, etc. are -

• Sedatives

• Pesticide

• Insecticide

• Fertilizers