1
Q:

If people sleep in closed rooms where charcoal fire is burning , they die due to 

A) carbon monoxide B) carbon dioxide
C) methane D) phosgene

Answer:   A) carbon monoxide

Explanation:

A closed room is aplace where charcoal is burnt in limited supply of air. There is every chance for the formation of the deadly poisonous carbon monoxide, which when inhaled, reacts with the iron in haemoglobin of blood and prevents the supply of oxygen. It is said to be treacherous as there can be no previous warning of its presence because it is an odourless and colourless gas.

Subject: Chemistry
Q:

Leakage of which of the following gases caused the Bhopal gas tragedy ?

A) Carbon monoxide B) Methyl isocyanate
C) Nitrous oxide D) Hydrogen sulphide
 
Answer & Explanation Answer: B) Methyl isocyanate

Explanation:
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2 33
Q:

Which one of the following is used to induce artificial rain ?

A) Potassium Nitrate B) Ammonium chloride
C) Calcium carbonate D) Silver lodide
 
Answer & Explanation Answer: D) Silver lodide

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Q:

A ‘breath test’ used by traffic police to check drunken driving uses ____?

A) Turmeric on filter paper B) Silica gel coated with silver nitrate
C) potassium permanganate-sulphuric acid D) Potassium dichromatic-sulphuric acid
 
Answer & Explanation Answer: D) Potassium dichromatic-sulphuric acid

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Q:

The enzyme that converts glucose to ethyl alcohol is 

A) Maltase B) Zymase
C) Diastase D) Invertase
 
Answer & Explanation Answer: B) Zymase

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2 14
Q:

The presence or absence of hydroxy group on which carbon atom of sugar differentiates RNA and DNA ?

A) 4th B) 2nd
C) 3rd D) 1st
 
Answer & Explanation Answer: B) 2nd

Explanation:

RNA has hydroxy group attached at the 2nd C-atom while DNA does not.

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