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8
Q:

Ozone hole refers to

A) Decrease in the thickness of ozone layer in Stratosphere B) Increase in thickness of ozone layer
C) Decrease in the ozone layer in Troposphere D) Hole in the ozone layer

Answer:   A) Decrease in the thickness of ozone layer in Stratosphere



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Subject: Chemistry
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The percentage of nitrogen in the air is about

A) 74% B) 76%
C) 78% D) 80%
 
Answer & Explanation Answer: C) 78%

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Methane contributes towards global warming so it is called a _________________ gas.

 

A) poisonous B) carcinogenic
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Which of the following is a metal?

 

A) Sulphur B) Nitrogen
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Answer & Explanation Answer: D) No option is correct

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Which of the following group is NOT Dobereiner Triads?

 

A) Li, Na, K B) N, P Au
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Answer & Explanation Answer: B) N, P Au

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Safety matches contain

A) Sulphur B) Phosphorus
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Answer & Explanation Answer: B) Phosphorus

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3 855
Q:

Air ___________________ are the substances which contaminate the air.

A) Reactants B) Irritants
C) Resistants D) Pollutants
 
Answer & Explanation Answer: D) Pollutants

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By using which foam the Researchers from Indian Institute of Technology – Bombay have made a low cost piezo resistive vibration sensor?

A) Only Polyurethane B) Only Polyethylene
C) Both Polyurethane and Polyethylene D) Neither Poly urethane nor Polyethylene
 
Answer & Explanation Answer: B) Only Polyethylene

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5 873
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Which of the following is NOT a compound?

 

A) Ammonia B) Milk
C) Sodiumchloride D) Chalk
 
Answer & Explanation Answer: B) Milk

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