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Q:

___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.

A) Methane B) Greenhouse
C) Carbon dioxide D) Ozone
 
Answer & Explanation Answer: B) Greenhouse

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Q:

Atomic Number of Hydrogen is _______.

A) 4 B) 3
C) 2 D) 1
 
Answer & Explanation Answer: D) 1

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Q:

Which of the following is a greenhouse gas or a gas, which can deplete the ozone layer?

A) As B) Kr
C) C4H8 D) CH4
 
Answer & Explanation Answer: D) CH4

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Q:

What happens in an oxidation reaction?

A) Protons are lost. B) Electrons are lost
C) Neutrons are lost. D) Electrons are gained.
 
Answer & Explanation Answer: B) Electrons are lost

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Q:

Which of the following gases is heavier than oxygen?

A) Carbon dioxide B) Ammonia
C) Methane D) Helium
 
Answer & Explanation Answer: A) Carbon dioxide

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Q:

Which of the following statement(s) is/are INCORRECT regarding Phosphorus?

A) Phosphorus reacts vigorously with water B) It is a non-metal
C) It catches fire on reacting with air D) It is found in group 15 of the modern periodic table
 
Answer & Explanation Answer: A) Phosphorus reacts vigorously with water

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Q:

Oxide of which of the following will turn red litmus blue?

A) Magnesium B) Phosphorus
C) Sulphur D) Carbon
 
Answer & Explanation Answer: A) Magnesium

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Q:

What is the percentage of methane in biogas?

A) 90% B) 80%
C) 60% D) 75%
 
Answer & Explanation Answer: D) 75%

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