Environmental Science and Ecology - Mock Test 73

Question 721

Commonly used radioactive isotopes in scientific research?

A) 14 C B) 125 I C) 32 P D) all of these

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Question 722

Example of primary pollutant?

A) SO2 B) NO2 C) CO D) hydrocarbons

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Question 723

Percentage of forest area recommended by the the national forest policy for plains is?

A) 33% B) 67% C) 30% D) 10%

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Question 724

The cutting down of trees and setting them on fire and raising crops on the resulting ash is called?

A) Pyrolysis B) Jhum C) Taungya system D) Shift cultivation

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Question 725

The main atmospheric layer near the surface of earth is?

A) troposphere B) mesophere C) ionosphere D) stratospher

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Question 726

Growing agricultural crops between rows of planted trees is known as?

A) Social forestry B) Jhum C) Taungya system D) Agroforestry

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Question 727

Soap and detergents are the source of organic pollutants like?

A) glycerol B) polyphosphates C) sulphonated hydrocarbons D) all of these

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Question 728

The pollution which does not persistent harm to life supporting system is?

A) Noise pollution B) Radiation pollution C) Organochlorine pollution D) All of these

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Question 729

The range of normal human hearing is in the range of?

A) 10 Hz to 80 Hz B) 50 Hz to 80 Hz C) 50Hz to 15000 Hz D) 15000 Hz and above

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Question 730

The effects of radioactive pollutants depends upon?

A) Rate of diffusion B) energy releasing capacity C) rate of deposition of the contaminant D) all of these

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