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 Chemistry Questions

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Q:

______ decreases the rate of setting of cement.

A) Alumina B) Silica
C) Gypsum D) Magnesium oxide
 
Answer & Explanation Answer: C) Gypsum

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Q:

Who was the first man to go to space?

A) Yuri Gagarin B) Yuri Rontgen
C) Yuris Cui D) Yuris Mahatinn
 
Answer & Explanation Answer: A) Yuri Gagarin

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0 1807
Q:

Which of the following is not a semiconductor?

A) CdS B) NaCl
C) Si D) Ge
 
Answer & Explanation Answer: B) NaCl

Explanation:

Semiconductors are those materials that are neither good conductors nor the good insulators of heat and electricity. Silicon (Si), Germanium (Ge) and Cadmium Sulphide (CdS) are semiconductors which work as conductors in some special conditions only.

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2 1806
Q:

Kidney stones are composed of ______.

A) Calcium Oxalate B) Sodium Chloride
C) Magnesium Nitrate D) Calcium Bicarbonate
 
Answer & Explanation Answer: A) Calcium Oxalate

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0 1806
Q:

Which of the following elements is used for vulcanizing rubber?

A) Sulphur B) Chlorine
C) Bromine D) Phosphorus
 
Answer & Explanation Answer: A) Sulphur

Explanation:

Vulcanization of rubber is a process of improvement of the rubber elasticity and strength by heating it in the presence of sulfur rubber much stronger, more flexible, and more resistant to heat and other environmental conditions.

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1 1802
Q:

The most serious air pollutant causing health hazard is

A) Sulphur dioxide B) Carbon monoxide
C) Ozone D) Nitrogen oxide
 
Answer & Explanation Answer: A) Sulphur dioxide

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2 1801
Q:

In the following reaction, fill in the blank.
Acid + Base → _______ + Water

A) Carbon dioxide B) Metal Oxide
C) Hydrogen Gas D) Salt
 
Answer & Explanation Answer: D) Salt

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1 1800
Q:

In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement".

As feared, (differences into) the families pose a hurdle.

A) difference into B) difference as in
C) difference amongst D) No improvement
 
Answer & Explanation Answer: C) difference amongst

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