Chapter 1: Air & Atmosphere - Science Mcqs for Grade 6 - Set 6

1)   An odorless, invisible gas that makes about 20%-22% of the earth's atmosphere is known as

a. oxygen
b. nitrogen
c. argon
d. carbon
Answer  Explanation 

ANSWER: oxygen

Explanation:
No explanation is available for this question!


2)   A thin layer that is held in place by gravity and provides us with oxygen is known as

a. temperature
b. season
c. atmosphere
d. weather
Answer  Explanation 

ANSWER: atmosphere

Explanation:
No explanation is available for this question!


3)   The percentage composition of nitrogen in air is

a. 58%
b. 68%
c. 78%
d. 88%
Answer  Explanation 

ANSWER: 78%

Explanation:
No explanation is available for this question!


4)   The second step of fractional distillation is heating the mixture so that components evaporate at their

a. boiling point
b. freezing point
c. neutral point
d. none of them
Answer  Explanation 

ANSWER: boiling point

Explanation:
No explanation is available for this question!


5)   In respiration, living organisms take in oxygen and give out

a. water vapor
b. argon
c. carbon dioxide
d. nitrogen
Answer  Explanation 

ANSWER: carbon dioxide

Explanation:
No explanation is available for this question!


6)   The left over gas after the process of combustion is generally

a. oxygen
b. argon
c. nitrogen
d. carbon dioxide
Answer  Explanation 

ANSWER: nitrogen

Explanation:
No explanation is available for this question!


7)   The sphere that prevent the ultraviolet rays from sun is known as

a. exosphere
b. troposphere
c. atmosphere
d. stratosphere
Answer  Explanation 

ANSWER: atmosphere

Explanation:
No explanation is available for this question!


8)   In humid areas, the water vapor content is

a. higher
b. lower
c. constant
d. none of them
Answer  Explanation 

ANSWER: higher

Explanation:
No explanation is available for this question!


9)   The percentage composition of oxygen in air is

a. 21%
b. 31%
c. 41%
d. 51%
Answer  Explanation 

ANSWER: 21%

Explanation:
No explanation is available for this question!


10)   Air is important on earth because it has necessary components essential for the life of

a. plants
b. animals
c. organism
d. plants, animals and other organisms
Answer  Explanation 

ANSWER: plants, animals and other organisms

Explanation:
No explanation is available for this question!