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Class 6 Exam  >  Class 6 Tests  >  Science Class 6  >  Important Questions Test: Air Around Us - Class 6 MCQ

Important Questions Test: Air Around Us - Class 6 MCQ


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20 Questions MCQ Test Science Class 6 - Important Questions Test: Air Around Us

Important Questions Test: Air Around Us for Class 6 2024 is part of Science Class 6 preparation. The Important Questions Test: Air Around Us questions and answers have been prepared according to the Class 6 exam syllabus.The Important Questions Test: Air Around Us MCQs are made for Class 6 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Air Around Us below.
Solutions of Important Questions Test: Air Around Us questions in English are available as part of our Science Class 6 for Class 6 & Important Questions Test: Air Around Us solutions in Hindi for Science Class 6 course. Download more important topics, notes, lectures and mock test series for Class 6 Exam by signing up for free. Attempt Important Questions Test: Air Around Us | 20 questions in 20 minutes | Mock test for Class 6 preparation | Free important questions MCQ to study Science Class 6 for Class 6 Exam | Download free PDF with solutions
Important Questions Test: Air Around Us - Question 1
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Which of these applies to nitrogen?

Detailed Solution for Important Questions Test: Air Around Us - Question 1

Nitrogen gas comprises 78% of atmosphere. It does not help in respiration, photosynthesis and burning.

Important Questions Test: Air Around Us - Question 2
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Moisture in air is called

Detailed Solution for Important Questions Test: Air Around Us - Question 2

The quantity of water vapour present in air is called as humidity.

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Important Questions Test: Air Around Us - Question 3
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In which of the following place quality of air is best?

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Quality of air is best in park in comparison to industrial area, busy road crossing and busy market place.

Important Questions Test: Air Around Us - Question 4
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This is used as a fuel in rockets for combustion of fuels
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Liquid hydrogen is used for burning fuel in the rockets.

Important Questions Test: Air Around Us - Question 5
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Finer hair inside the nose
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Finer hairs inside the nose filter the dust particle while inhaling the air.

Important Questions Test: Air Around Us - Question 6
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Winnowing is used to separate
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Winnowing is used to separate grains from husk due to difference in their density.

Important Questions Test: Air Around Us - Question 7
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The layer of air around the earth surface is called
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The layer of air around the earth surface is called atmosphere.

Important Questions Test: Air Around Us - Question 8
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Name the object which is inflated by air
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Balloons is inflated by air due to pressure of air.

Important Questions Test: Air Around Us - Question 9
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Density of air ____________ with height.
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Density of air decrease with height as we move upwards.

Important Questions Test: Air Around Us - Question 10
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Gases and fine dust particle together make the
Detailed Solution for Important Questions Test: Air Around Us - Question 10

Gases and dust particle together make the smoke. Smoke starts from burning substances.

Important Questions Test: Air Around Us - Question 11
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Oxygen is used in hospitals for
Detailed Solution for Important Questions Test: Air Around Us - Question 11

In hospital oxygen gas is used for artificial respiration for patient having respiratory problem.

Important Questions Test: Air Around Us - Question 12
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Atmospheric pressure _____________ with height.
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Atmospheric pressure decrease with height due to decrease in density of air.

Important Questions Test: Air Around Us - Question 13
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Explain the following observations briefly:
An empty glass in fact is not empty.
Detailed Solution for Important Questions Test: Air Around Us - Question 13

The glass which is empty is actually filled with air. And because air takes up space when an empty glass is inverted and inserted into a trough filled with water, the air is trapped within and it is no anyway for air to escape out.

Important Questions Test: Air Around Us - Question 14
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The balance between carbon dioxide and oxygen is maintained by
Detailed Solution for Important Questions Test: Air Around Us - Question 14

The balance between carbon dioxide and oxygen is maintained by photosynthesis and respiration in which carbon dioxide and oxygen is used and oxygen and carbon dioxide is produced respectively.

Important Questions Test: Air Around Us - Question 15
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All animals including human exhale
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All animals including human exhale carbon dioxide gas and inhale oxygen gas.

Important Questions Test: Air Around Us - Question 16
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Which of the following gas is found in largest quantity in air?
Detailed Solution for Important Questions Test: Air Around Us - Question 16

Nitrogen gas is found in largest quantity in air followed by oxygen gas.

Important Questions Test: Air Around Us - Question 17
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During rain, soil animals comes out from their burrows for
Detailed Solution for Important Questions Test: Air Around Us - Question 17

During rain, soil animals come out from their burrows for respiration as their burrow is filled by water.

Important Questions Test: Air Around Us - Question 18
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Animals living in water have ____________ for respiration.
Detailed Solution for Important Questions Test: Air Around Us - Question 18

Animals living in water have gills for respiration which intake oxygen gas dissolved in water.

Important Questions Test: Air Around Us - Question 19
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In which of the following air is not used?
Detailed Solution for Important Questions Test: Air Around Us - Question 19

Air is not required for boiling water but required for inflating tyres, filling balloon and winnowing.

Important Questions Test: Air Around Us - Question 20
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The components of air which are harmful to living beings are
Detailed Solution for Important Questions Test: Air Around Us - Question 20

Explanation for the correct option.

  1. Dust and fumes make breathing difficult.
  2. It causes injuries to our lungs.
  3. Smoke and dust also cause cardiovascular health problems.
  4. Tiny particles and gases in the smoke can cause inflammation in the eyes and lungs, which can lead to runny nose, bronchitis, or eye irritation.
  5. Exposure to high concentrations of these particles can cause persistent coughing, coughing, wheezing, and difficulty breathing.
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