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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:

Acid Rain has pH value of

A) 5.5 or less B) 12.5 or more
C) 10.5 or more D) 8.5 or more
 
Answer & Explanation Answer: A) 5.5 or less

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Q:

Which one of the following is not a borderline element?

A) Boron B) Silicon
C) Polonium D) Bismuth
 
Answer & Explanation Answer: D) Bismuth

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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:

When two liquids do not mix with each other to form a solution, what is it called?

A) Solvent B) Solute
C) Immiscible D) Decantation
 
Answer & Explanation Answer: C) Immiscible

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Q:

The credit for classifying the elements on the basis of their atomic masses goes to

A) John Dalton B) John Alexander Reina Newlands
C) Dmitri Mendeleev D) Johann Wolfgang Dobereiner
 
Answer & Explanation Answer: C) Dmitri Mendeleev

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Q:

Which of the following gases turns lime water milky?

A) O3 B) CO2
C) O2 D) CO
 
Answer & Explanation Answer: B) CO2

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Q:

The metal that can be cut with a knife is

A) Sodium B) Iron
C) Aluminium D) Copper
 
Answer & Explanation Answer: A) Sodium

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