MCQ : Natural Resources - 2 | 20 Questions MCQ Test

QUESTION: 1

The main source of fresh water in India is

A.
sea water
B.
surface water
C.
groundwater
D.
rainwater

Solution:

Rainfall is the main source of fresh water in India. From precipitation alone (including snowfall), India receives 4,000 cubic km water. Of this, monsoon rainfall from June to September alone accounts for about 3,000 cubic km. A good part of it is lost through the process of evaporation and plant transpiration. A large part of water percolated into the ground and is available to us in the form of groundwater.

QUESTION: 2

The atmosphere of the earth is heated by radiations which are mainly

A.
radiated by the sun
B.
re-radiated by land
C.
re-radiated by water
D.
re-radiated by land and water

Solution:

QUESTION: 3

All of earth’s water, land and atmosphere, within which life exists is known as

A.
biosphere
B.
population
C.
biome
D.
communi

Solution:

QUESTION: 4

If there were no atmosphere around the earth, the temperature of the earth will

A.
increase
B.
go on decreasing
C.
increase during day and decrease during night
D.
be unaffected

Solution:

QUESTION: 5

The nitrogen molecules present in air can be converted into nitrates and nitrites by

A.
a biological process of nitrogen fixing bacteria present in soil
B.
a biological process of carbon fixing factor present in soil
C.
any of the industries manufacturing nitrogenous compounds
D.
the plants used as cereal crops in field

Solution:

QUESTION: 6

Ozone layer is getting depleted because of

A.
excessive use of automobiles
B.
excessive formation of industrial units
C.
excessive use of man-made compounds containing both fluorine and chlorine
D.
excessive deforestation.

Solution:

QUESTION: 7

The amount of carbon dioxide in the atmosphere has increased in recent years. Environmentalists suggest this change is a direct result of the

A.
Dumping of inorganic materia! into lakes and rivers
B.
Improper storage of solid and nuclear waste
C.
Use of herbicides and toxic substances such as asbestos and DDT
D.
Overcutting of forests and the increased use of fossil fuels

Solution:

QUESTION: 8

Low visibility during cold weather is due to

A.
formation of fossil fuel
B.
unburnt carbon particles or hydrocarbons suspended in air
C.
lack of adequate power supply
D.
none of these

Solution:

QUESTION: 9

Smog is the mixture of

A.
smoke + CO₂
B.
smoke + nitrogen
C.
smoke + fog
D.
smoke + ozone

Solution:

QUESTION: 10

Choose the correct sequencs.

A.
CO₂ in atmosphere → decomposers → organic carbon in animals → organic carbon in plants
B.
CO₂ in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil
C.
Inorganic carbonates in water → organic carbon in plants → organic carbon in animals → scavengers
D.
Organic carbon in animals → decomposers → CO₂ in atmosphere → organic carbon in nlants

Solution:

QUESTION: 11

In nutrient cycle, minerals tend to be dispersed through

A.
evaporation
B.
assimilation
C.
surface and sub-surface run off
D.
convection

Solution:

QUESTION: 12

What happens when rain falls on soil without vegetational cover?

A.
Rain water percolates in soil efficiently
B.
Rain water causes loss of surface soil
C.
Rain water leads to fertility of the soil
D.
Rain water does not cause any change in soil

Solution:

QUESTION: 13

Soil composition is dependent on weathering because

A.
it contributes sediment to the soil
B.
it moves the topsoil to other areas where it is more needed
C.
it makes the soil more fertile
D.
it keeps the soil moist

Solution:

QUESTION: 14

Top soil contains the following

A.
Humus and living organisms only
B.
Humus and living soil particles only
C.
Humus, living organisms and soil particles
D.
Humus, living organisms and plants

Solution:

Top soil is the topmost and outermost layer of the soil, which is usually 2 inches to 8 inches layer. It is generally dark in colour due to humus, i.e., partially decayed organic matter, soil particles and living organisms as soil bacteria etc.

QUESTION: 15

Which of the following processes is involved in the water cycle?

A.
Bathing, drinking and swimming
B.
Paddling, swimming and drinking
C.
Evaporation, dehydration and hibernation
D.
Evaporation, condensation and precipitation.

Solution:

QUESTION: 16

What would happen, if all the oxygen present in the environment is converted to ozone?

A.
We will be protected more
B.
It will become poisonous and kill living forms
C.
Ozone is not stable., hence it will be toxic
D.
It will help harmful sun radiations to reach earth and damage many life forms

Solution:

QUESTION: 17

In nitrogen cycle, which bacteria are responsible for nitrification?

A.
Rhizobium
B.
Nitrosomonas
C.
Nitrosomonas and Nitrobacter
D.
Clostridium

Solution:

QUESTION: 18

Growth of lichens on barren rocks is followed by the growth of

A.
moss
B.
ferns
C.
gymnosperm
D.
algae

Solution:

QUESTION: 19

Why is it difficult to integrate nitrogen gas from the atmosphere in the nitrogen cycle of the biosphere?

A.
Most plants do not require organic nitrogen compounds for survival.
B.
Nitrogen is not very abundant in the atmosphere.
C.
Few organisms can directly utilise atmospheric nitrogen gas.
D.
Living organisms quickly absorb nitrogen gas.

Solution:

QUESTION: 20

The process of nitrogen-fixation by bacteria does not take place in the presence of

A.
molecular form of hydrogen
B.
elemental form of oxygen
C.
water
D.
elemental form of nitrogen

Solution:

MCQ : Natural Resources - 2

20 Questions MCQ Test Science Class 9 | MCQ : Natural Resources - 2

The main source of fresh water in India is

The atmosphere of the earth is heated by radiations which are mainly

All of earth’s water, land and atmosphere, within which life exists is known as

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