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Question (11)

QN002781

Which alloy is commonly used in aircraft bodies due to low weight and high strength?

(A) Bronze
(B) Steel
(C) Duralumin
(D) Brass

Correct Answer: C

Explanation:

Duralumin is lightweight and strong.

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Question (12)

QN002782

Duralumin mainly contains aluminium mixed with

(A) copper, magnesium, and manganese
(B) sulfur and carbon
(C) oxygen and nitrogen
(D) sodium and chlorine

Correct Answer: A

Explanation:

Duralumin is an alloy of aluminium with copper, magnesium, and manganese.

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Question (13)

QN002783

Which compound is used in fire extinguishers?

(A) Carbon dioxide
(B) Hydrogen
(C) Oxygen
(D) Nitrogen

Correct Answer: A

Explanation:

Carbon dioxide helps extinguish fire.

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Question (14)

QN002784

Oxygen cylinders are used in hospitals because oxygen

(A) supports respiration
(B) prevents rusting
(C) makes alloys
(D) absorbs heat

Correct Answer: A

Explanation:

Oxygen is necessary for breathing.

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Question (15)

QN002785

Which of the following is used in water purification?

(A) Sodium chloride
(B) Chlorine
(C) Carbon powder
(D) Sulfur dioxide

Correct Answer: B

Explanation:

Chlorine kills harmful microorganisms in water.

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Question (16)

QN002786

LPG used as cooking fuel is mainly a mixture of

(A) methane and oxygen
(B) propane and butane
(C) nitrogen and hydrogen
(D) sulfur and carbon

Correct Answer: B

Explanation:

LPG mainly contains propane and butane gases.

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Question (17)

QN002787

Which property makes aluminium suitable for making cooking utensils?

(A) Poor heat conduction
(B) Lightweight and good conductor of heat
(C) Brittle nature
(D) Low melting point only

Correct Answer: B

Explanation:

Aluminium is light and conducts heat well.

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Question (18)

QN002788

Which material is mainly used in making solar panels?

(A) Sulfur
(B) Silicon
(C) Iron
(D) Bromine

Correct Answer: B

Explanation:

Silicon is widely used in solar cells.

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Question (19)

QN002789

Silicon is useful in electronics because it is a

(A) noble gas
(B) compound
(C) metalloid semiconductor
(D) liquid metal

Correct Answer: C

Explanation:

Silicon acts as a semiconductor.

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Question (20)

QN002790

Which mixture is commonly used in road construction?

(A) Vinegar
(B) Asphalt
(C) Oxygen gas
(D) Distilled water

Correct Answer: B

Explanation:

Asphalt is used for surfacing roads.

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Question (11)

Which alloy is commonly used in aircraft bodies due to low weight and high strength?

Explanation:

Link:

Question (12)

Duralumin mainly contains aluminium mixed with

Explanation:

Link:

Question (13)

Which compound is used in fire extinguishers?

Explanation:

Link:

Question (14)

Oxygen cylinders are used in hospitals because oxygen

Explanation:

Link:

Question (15)

Which of the following is used in water purification?

Explanation:

Link:

Question (16)

LPG used as cooking fuel is mainly a mixture of

Explanation:

Link:

Question (17)

Which property makes aluminium suitable for making cooking utensils?

Explanation:

Link:

Question (18)

Which material is mainly used in making solar panels?

Explanation:

Link:

Question (19)

Silicon is useful in electronics because it is a

Explanation:

Link:

Question (20)

Which mixture is commonly used in road construction?

Explanation:

Link:

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