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Q:

Atomic mass of Nitrogen is 14 and that of Hydrogen is 1. What will be the molecular mass of Ammonia?

A) 18 B) 17
C) 16 D) 15
 
Answer & Explanation Answer: B) 17

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Q:

Biogas is produced from biomass by

A) destructive distillation B) fractional distillation
C) anaerobic fermentation D) dry distillation
 
Answer & Explanation Answer: C) anaerobic fermentation

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Q:

Which of the following is NOT correctly matched?

A) Sandstone - conglomerate   B) Limestone - Marble  
C) Granite - Basalt   D) Gabbro - Serpentine  
 
Answer & Explanation Answer: A) Sandstone - conglomerate  

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Q:

The percentage of carbon in CO2 is

A) 12 B) 44
C) 14 D) 27.3
 
Answer & Explanation Answer: D) 27.3

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Q:

Which of the following metals cannot be easily cut with a knife?

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

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Q:

The number of free electrons in the outermost shell of carbon atoms in diamand is

A) zero B) two
C) four D) three
 
Answer & Explanation Answer: A) zero

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Q:

Which of the following metals is found in free state?

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

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Q:

Which of the following metals is a liquid at room temperature?

A) Lithium B) Mercury
C) Sodium D) Calcium
 
Answer & Explanation Answer: C) Sodium

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