Which of the following is / are a fossil fuel?
i. Tar
ii. Coal
iii. Petroleum

(a)

i only

(b)

i only ii

(c)

ii and iii

(d)

i, ii and iii

A renewable source of energy is

(a)

petroleum

(b)

coal

(c)

nuclear fuel

(d)

trees

An inexhaustible resources is

(a)

wind power

(b)

soil fertility

(c)

wild life

(d)

all of the above

Green house effect refers to

(a)

cooling of earth

(b)

trapping of UV rays

(c)

cultivation of plants

(d)

warming of earth

Deforestation leads to ______________ in rainfall.

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decrease

Tidal energy is ___________ type of energy.

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Electrical

______________ is the most commonly used fuel for the production of electricity.

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Coal

Soil erosion

(1)

removal of vegetation

Bio gas

(2)

energy saving

CFL bulbs

(3)

O₂

Solid waste

(4)

Lead and heavy metals

Assertion: Rainwater harvesting is to collect and store rain water.
Reason: Rainwater can be directed to recharge the underground water source.
Codes:
a) Both assertion and reason are true and reason is correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion.
c) Assertion is true but reason is false.
d) Both assertion and reason are false.

What will happen if trees are cut down?

What are the agents of soil erosion?

Solar energy is a renewable energy. How?

What are the advantages of using biogas?

Enumerate the importance of forest.