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 General Science Questions

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Q:

The elemental composition of an adult human body by mass is

A) C > O > H > N B) O >C >H > O
C) N > C > O > H D) None
 
Answer & Explanation Answer: B) O >C >H > O

Explanation:
O= 65%
C= 18%
H= 9.5%
N= 3.2%
Ca= 1.5%
Ph=1.2%
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Q:

Formic acid is produced by __________ .

A) White ants B) Cockroaches
C) Red ants D) Mosquitoes
 
Answer & Explanation Answer: C) Red ants

Explanation:
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2 1709
Q:

Human Beings belong to which category of the ecosystem?

A) Omnivores B) Carnivores
C) Herbivores D) Zooplankton
 
Answer & Explanation Answer: A) Omnivores

Explanation:
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Q:

Which one of the following air pollutants combines with the haemoglobin of human blood and reduces its oxygen-carrying capacity, leading to suffocation and may cause even death?

A) Chlorofluorocarbon B) Fly ash
C) Carbon monoxide D) Sulphur dioxide
 
Answer & Explanation Answer: C) Carbon monoxide

Explanation:

Carbon monoxide (CO) is very dangerous because it binds with the haemoglobin more efficiently than oxygen does. It "hogs the seats" so that oxygen can't get a ride. And those CO molecules keep riding around, never giving their seats up to the oxygen. This means there is no way to get oxygen to the brain, heart, or other cells and those cells start to die. And finally, it leads to suffocation and even death of a person.

 

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3 1697
Q:

Which of the following uses a nonrenewable energy source to make electricity?

A) power plant B) wind mill
C) swimming pool D) All of the above
 
Answer & Explanation Answer: A) power plant

Explanation:

From the given options, a power plant uses a nonrenewable energy source to make electricity. A power plant uses coal for making power production.

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1 1695
Q:

Name the catalyst used in the conversion of milk into curd.

A) Pepsin B) Invertase
C) Lactase D) Diastase
 
Answer & Explanation Answer: C) Lactase

Explanation:
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Q:

Soil contains decayed remains of living organisms. This is called __________.

A) minerals B) biosphere
C) saline soil D) humus
 
Answer & Explanation Answer: D) humus

Explanation:
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3 1694
Q:

Which of the following planets of our solar system has least mass?

A) Neptune B) Jupiter
C) Mars D) Mercury
 
Answer & Explanation Answer: D) Mercury

Explanation:

 

 

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