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Q:

One of the techniques used for desalination of sea water is

A) Filtration B) Distillation
C) Evaporation D) Condensation
 
Answer & Explanation Answer: B) Distillation

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Q:

Which of the following is NOT a noble gas?

A) Radon B) Krypton
C) Xenon D) Hydrogen
 
Answer & Explanation Answer: D) Hydrogen

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Q:

The number of neutrons present in a nitrogen atom is ___.

A) 14 B) 7
C) 11 D) 5
 
Answer & Explanation Answer: B) 7

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Q:

The pH value increase from 7 to 14 represents a

A) decrease in H+ ion concentration B) decrease in OH- ion concentration
C) increase in OH- ion concentration D) increase in H+ ion concentration
 
Answer & Explanation Answer: C) increase in OH- ion concentration

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Q:

Which is the first metallic element in the Modern Periodic Table?

A) Li B) Na
C) He D) H2
 
Answer & Explanation Answer: A) Li

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Q:

The hardest natural substance is

A) Graphite B) Diamond
C) Iron D) Copper
 
Answer & Explanation Answer: B) Diamond

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Q:

Nitrogen fixation is a process of

A) Assimilation of nitrate B) Utilisation of nitrogen gas
C) Conversion of organic nitrogen to proteins D) Conversion of molecular nitrogen to ammonia
 
Answer & Explanation Answer: C) Conversion of organic nitrogen to proteins

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Q:

Which of the following metals does NOT react with cold or hot water?

A) Aluminium B) Potassium
C) Sodium D) Calcium
 
Answer & Explanation Answer: A) Aluminium

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