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Q:

The function of nitrogen in air is 

A) to make air a moderate supporter of combustion B) to maintain the density of air constant
C) to prevent the hydrogen in air from exploding D) to reduce the poisonous nature of ozone in air

Answer:   A) to make air a moderate supporter of combustion



Explanation:

If air contained all oxygen and no nitrogen, everything would have burnt off

Subject: Chemistry
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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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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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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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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Q:

ATP stands for -

A) Adenosine triphosphate B) Alanine triphosphate
C) Adrenalin triphosphate D) Asparagine triphosphate
 
Answer & Explanation Answer: A) Adenosine triphosphate

Explanation:

Adenosine triphosphate (ATP) is a nucleotide which is also called as nucleoside triphosphate is a small molecule used in cells as a coenzyme. It is often referred to as the "molecular unit of currency" of intracellular energy transfer. ATP transports chemical energy within cells for metabolism. Most of the cellular functions need energy in order to be carried out such as synthesis of proteins, synthesis of membranes, movement of the cell, cellular division, transport of various solutes etc. The ATP is the molecule that carries energy to the place where the energy is needed. When ATP breaks into ADP (adenosine diphosphate) and Pi (phosphate), the breakdown of the last covalent link of phosphate liberates energy that is used in reactions where it is needed.

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