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Q:

The monomer/monomers used for the synthesis of Nylon 6 is/are

A) hexamethylenediamine and adipic acid B) caprolactam
C) urea and formaldehydeD. D) phenol and formaldehyde
 
Answer & Explanation Answer: A) hexamethylenediamine and adipic acid

Explanation:

Nylon is made when the appropriate monomers (the chemical building blocks which make up polymers) are combined to form a long chain via a condensation polymerisation reaction. The monomers for nylon 6-6 are adipic acid and hexamethylene diamine

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Q:

Which of the following induces souring of milk?

A) Acetic Acid B) Citric Acid
C) Ascorbic Acid D) Lactic Acid
 
Answer & Explanation Answer: D) Lactic Acid

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Q:

Removal of carbon particles from air involves the principle of

A) Precipitation B) Filteration
C) Electrophoresis D) Sedimentation
 
Answer & Explanation Answer: C) Electrophoresis

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Q:

When Granite rocks get metamorphosed, they form

A) Quartzite B) Gneiss
C) Marble D) Slate
 
Answer & Explanation Answer: B) Gneiss

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Q:

When ice cubes are made, the entropy of water

A) does not change B) decreases
C) increases D) may either increase or decrease depending on the process used
 
Answer & Explanation Answer: B) decreases

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Q:

Which of the following inert gases is placed in period 4 of the periodic table?

A) Kr B) Rn
C) Xe D) Ar
 
Answer & Explanation Answer: A) Kr

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Q:

The biogas used for cooking is a mixture of which of the following ?

A) Carbon dioxide & oxygen B) Isobutane & propane
C) Methane & carbon monoxide D) Methane & carbon dioxide
 
Answer & Explanation Answer: D) Methane & carbon dioxide

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Q:

Which chemical is present in the cells of cork of tree which makes them impervious to gases and water

A) Cellulose B) Suberin
C) Pectin D) Lignin
 
Answer & Explanation Answer: B) Suberin

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