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Question (31)

QN0037651

Why is conservation of minerals necessary?

(A) Minerals are unlimited
(B) Mineral formation takes millions of years and deposits are finite
(C) Minerals can be produced instantly
(D) Mining does not affect the environment

Correct Answer: B

Explanation:

Minerals are finite and non-renewable because their formation takes millions of years.

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Question (32)

QN0037652

If a household's energy requirement is assumed to be 70% from firewood and dung cakes and conservation reduces this dependence by 20 percentage points, what would the remaining dependence be?

(A) 30%
(B) 40%
(C) 50%
(D) 60%

Correct Answer: C

Explanation:

Remaining dependence = 70% − 20% = 50%.

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Question (33)

QN0037653

Why is burning dung cakes discouraged as a major energy source?

(A) Dung cannot burn
(B) Dung can be used as manure in agriculture
(C) Dung contains petroleum
(D) Dung produces electricity directly

Correct Answer: B

Explanation:

Dung is better used as manure because it can improve agricultural productivity.

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Question (34)

QN0037654

Which sequence correctly represents the increasing quality of coal?

(A) Anthracite → Bituminous → Lignite → Peat
(B) Peat → Lignite → Bituminous → Anthracite
(C) Lignite → Peat → Anthracite → Bituminous
(D) Bituminous → Lignite → Peat → Anthracite

Correct Answer: B

Explanation:

Coal quality generally increases from peat to lignite, bituminous and finally anthracite.

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Question (35)

QN0037655

Which type of coal is considered high-grade and is used in blast furnaces?

(A) Peat
(B) Lignite
(C) Metallurgical coal
(D) Brown coal

Correct Answer: C

Explanation:

Metallurgical coal is a high-grade bituminous coal used in blast furnaces.

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Question (36)

QN0037656

Why are many thermal power plants and heavy industries located near coalfields?

(A) Coal is very light
(B) Coal is bulky and loses weight as ash after burning
(C) Coal is renewable
(D) Coal is found only near cities

Correct Answer: B

Explanation:

Coal is bulky and loses weight as ash, so industries and thermal plants are often located near coalfields.

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Question (37)

QN0037657

A coal reserve contains 800 tonnes. If 25% is consumed, how much coal remains?

(A) 400 tonnes
(B) 500 tonnes
(C) 600 tonnes
(D) 700 tonnes

Correct Answer: C

Explanation:

Consumed coal = 25% of 800 = 200 tonnes. Remaining = 800 − 200 = 600 tonnes.

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Question (38)

QN0037658

Why are petroleum refineries called nodal industries?

(A) They provide raw materials for several industries such as fertilisers, chemicals and synthetic textiles
(B) They produce only electricity
(C) They are located only in coalfields
(D) They produce only iron

Correct Answer: A

Explanation:

Petroleum refineries supply raw materials to many industries and therefore act as nodal industries.

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Question (39)

QN0037659

Petroleum generally occurs in:

(A) Anticlines and fault traps
(B) River valleys only
(C) Mountain peaks
(D) Ocean beaches only

Correct Answer: A

Explanation:

Petroleum occurs in anticlines and fault traps where oil and gas are trapped in geological structures.

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Question (40)

QN0037660

In a typical petroleum deposit, natural gas is found:

(A) Below the oil
(B) Above the oil
(C) Below the rock basement
(D) Mixed only with water

Correct Answer: B

Explanation:

Natural gas is lighter than oil and is generally found above the oil deposits.

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Question (31)

Why is conservation of minerals necessary?

Explanation:

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Question (32)

If a household's energy requirement is assumed to be 70% from firewood and dung cakes and conservation reduces this dependence by 20 percentage points, what would the remaining dependence be?

Explanation:

Link:

Question (33)

Why is burning dung cakes discouraged as a major energy source?

Explanation:

Link:

Question (34)

Which sequence correctly represents the increasing quality of coal?

Explanation:

Link:

Question (35)

Which type of coal is considered high-grade and is used in blast furnaces?

Explanation:

Link:

Question (36)

Why are many thermal power plants and heavy industries located near coalfields?

Explanation:

Link:

Question (37)

A coal reserve contains 800 tonnes. If 25% is consumed, how much coal remains?

Explanation:

Link:

Question (38)

Why are petroleum refineries called nodal industries?

Explanation:

Link:

Question (39)

Petroleum generally occurs in:

Explanation:

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Question (40)

In a typical petroleum deposit, natural gas is found:

Explanation:

Link:

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