1
Q:

According to the modern Periodic Law, the properties of elements are periodic functions of their

A) volency B) atomic mass
C) number of neutrons D) atomic number

Answer:   D) atomic number



Explanation:

Atomic number is the serial number of an element in the periodic classification of elements. It gives the number of protons and also the number of electrons in an atom.

Subject: Chemistry
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 & Explanation Answer: A) Decrease in the thickness of ozone layer in Stratosphere

Explanation:
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5 126
Q:

Which gas is known as "Fuel of Future" ?

A) Methane B) Oxygen
C) Neon D) Hydrogen
 
Answer & Explanation Answer: D) Hydrogen

Explanation:

Because of its being pollution free and  combustion efficient, Hydrogen gas is  called fuel of future. Because of its origin in marshy places, Methane is called as 'Marsh Gas'.

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19 737
Q:

Cutting and peeling of onion brings tears to the eyes because of the presence of _____ ?

A) Amino acid B) Sulfur
C) Carbon D) Fat
 
Answer & Explanation Answer: B) Sulfur

Explanation:

Cutting and Peeling of onion brings Tears to the eyes because of presence of Sulphur in the cell.

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14 550
Q:

Which one of the following is a natural colloid ?

A) Cane sugar solution B) Blood
C) Sodium chloride solution D) Urea solution
 
Answer & Explanation Answer: B) Blood

Explanation:
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13 1016
Q:

All of the following are constituents of RNA molecule except _____

A) Thymine B) Adenine
C) Uracil D) Guanine
 
Answer & Explanation Answer: A) Thymine

Explanation:
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