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General Science 8th Class English Medium Chapter 1 Online Test MCQs With Answers

Question # 1

During respiration by the animals, whihc gas is released into the atmosphere.

Choose an answer

Nitrogen

Oxygen

Carbon Di oxide

Hydrogen

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Question # 2

The poisonous and harmsful substances which make the air unfavorable for life are called.

Choose an answer

Solid pollutant

Air pollutant

Water pollutant

Acid Rain

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Question # 3

Ozone is a layer of gases in ............. atmosphere of the Earth.

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Upper

Lower

Middle

Inner

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Question # 4

Which is the solution of environmental problems.

Choose an answer

Reducing pollution

Plantation

Protection of endangered

All these

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Question # 5

All the food chains are joined together to form .....

Choose an answer

Food web

Ecologicla pyramid

Tropicla level

None of these

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Question # 6

Half of the increase in atmospheric carbon dioxide concentrations in the last.............. years has occured since 1980

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100

200

300

400

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Question # 7

------------- gas is released when dead organisms are decomposed by the decomposers.

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Oxygen

Carbon dioxide

Nitrogen

Hydrogen

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Question # 8

Which factor is responsible for ecological imbalance.

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Over hunting

Change in water supply

Migration

All these

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Question # 9

A symbiotic relationship in whihc both speciesl get benefit is called.

Choose an answer

Commensalism

Hebitate

Mutualism

Symbiosis

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Question # 10

The energy of the Sun in traped as chemical energy by.

Choose an answer

Tertiary consumers

Primary consumers

Producers

Secondary consumers

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