ncert objective questions and answers For UPSC | SSC | Rail | RRB | State PSC P11

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Page 11

2541101. The pollutants to cause maximum damage to ozone layer are

A

hydrocarbon

B

carbon dioxide

C

nitrous oxide

D

chloro-fluoro-carbon

D

0 - 2015

Correct Answer: D. chloro-fluoro-carbon

90187102. Which of the following produces the highest amount of energy upon oxidation?

A

Protein

B

Fat

C

Glucose

D

An alkane

B

Correct Answer: B. Fat

90147103. Ultraviolet radiation striking the earth is due to the depletion of

A

carbon monoxide

B

carbon dioxide

C

ozone

D

oxygen

C

Correct Answer: C. ozone

90088104. Smoke is formed due to

A

solid dispersed in gas

B

solid dispersed in liquid

C

gas dispersed in solid

D

gas dispersed in gas

A

Correct Answer: A. solid dispersed in gas

90013105. An inert gas mixed with oxygen given to patients suffering from restricted breathing is

A

Helium

B

Krypton

C

Radon

D

Argon

A

Correct Answer: A. Helium

90007106. Among the following the hardest metal is

A

Gold

B

Iron

C

Platinum

D

Tungsten

D

Correct Answer: D. Tungsten

90164107. When there are two electrons in the same orbital, they have

A

same spin

B

opposite spin

C

same or opposite spin

D

no spin

B

Correct Answer: B. opposite spin

90030108. Commercially, sodium bicarbonate Is known as

A

Washing soda

B

Baking soda

C

Bleaching powder

D

Soda ash

B

Correct Answer: B. Baking soda

90066109. Milk of Magnesia' is a suspension of

A

magnesium sulfate

B

magnesium carbonate

C

magnesium hydroxide

D

magnesium chloride

C

Correct Answer: C. magnesium hydroxide

90065110. Milk is a natural

A

Solution

B

Emulsion

C

Mixture

D

Suspension

B

Correct Answer: B. Emulsion

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