Class 6 Science MCQ Air Around Us

(a) Nitrogen
(b) Helium
(c) Krypton
(d) Argon

Question : The constituent of air that supports combustion is

(a) oxygen
(b) nitrogen
(c) carbon dioxide
(d) No0ne of these

Question : Which of the following represents correct order of abundance of various gases in air?

(a) Nitrogen> Oxygen> Carbon dioxide> Argon
(b) Nitrogen> Oxygen> Argon> Carbon dioxide
(c) Oxygen > Nitrogen> Carbon dioxide> Argon
(d) Carbon dioxide> Nitrogen> Oxygen > Argon

Question : Which of the following is a variable component of air ?

(a) Water vapour
(b) Nitrogen
(c) Oxygen
(d) Carbon dioxide

Question : The atmospheric layer nearest the earth’s surface is the

(a) troposphere
(b) stratosphere
(c) ionosphere
(d) mesosphere

Question : Which of the following is second layer of atmosphere?

(a) Stratosphere
(b) Thermosphere
(c) Troposphere
(d) Mesosphere

Question : Which of the following gas helps in burning?

(a) Nitrogen
(b) Oxygen
(c) Carbon dioxide
(d) Carbon monoxide

Question : contains few gases and fire dust particle.

(a) Wind
(b) Vapour
(c) Atmosphere
(d) Smoke

Question : Moving air is called

(a) dust
(b) smoke
(c) wind
(d) nitrogen

Question : The layer of air around the earth surface is called

(a) Hydrosphere
(b) Lithosphere
(c) Atmosphere
(d) Stratosphere

Question : Wind is

(a) air around us
(b) rising hot air
(c) air in motion
(d) none of these

Question : The properties of air are:

(a) It has no colour
(b) It occupies space
(c) It is transparent
(d) All of these

Question : The composition of nitrogen gas in the atmosphere is

(a) 21%
(b) 78%
(c) 1%
(d) 0.01%

Question : The components of air which are harmful to living beings are

(a) Nitrogen and carbon dioxide
(b) Dust and water vapour
(c) Smoke and water vapour
(d) Dust and smoke

Question : Air is

(a) a mixture
(b) a pure substance
(c) an element
(d) anything, that depends on the place where it is found

Question : When the bottle was tilted, the air was able to come out in the form of.

(a) Gas
(b) Smoke
(c) Vapour
(d) Bubbles

Question : Smoke is produced mainly by burning

(a) wood
(b) coal
(c) kerosene
(d) all of these

Question : Finer hair inside the nose

(a) Filter the microbes
(b) Prevent the water vapour
(c) Prevent the carbon dioxide gas
(d) Filter the dust particle

Question : Which is not a property of air?

(a) It occupies space.
(b) It is transparent,
(c) It is a solution.
(d) It is a compound.

Question : What is the percentage of nitrogen and oxygen in air ?

(a) 98%
(b) 99%
(c) 97%
(d) 100%

Question : We should breathe through the nose and not by the mouth, because ____

(a) it is a bad habit
(b) the air is moisturized when we breathe through mouth
(c) the hair and mucus in our nostrils trap soot and dust particles present in the air
(d) it is natural phenomenon

Question : Take some water in a glass vessel or beaker. Heat it slowly on a tripod stand. Well before the water begins to boil, look carefully at the inner surface of the vessel. From where do these bubbles come?

(a) These bubbles are due to the heating of water closer to the vessel
(b) These bubbles are due to extremely cold temperature of the water
(c) The dissolved air comes out of the water
(d) The bubbles are due to formation of fog

Question : Earth worms come out of the soil during rainy seasons because:

a. The rain goes into the soil and reaches the water table. The earthworms come out to be relieved of the wet weather.
(b) The rain fills up the space between soil particles. The air comes out; Hence earthworms come out for breathing
(c) The earthworms come out to move around in the sun
(d) None of the above

Question : The wind mill uses air for:

(a) Making it move and thus it is able to generate electricity
(b) Making it move to show the direction of the wind
c. Making it move to show signals
(d)Making it move to slow down vehicles

Question : Air plays an important role in water cycle. How?

(a) Air moves over the oceans
b. Air moves over the land
(c) Air moves to evaporate water which then condenses on cooler layers
(d) Air is everywhere.

Question : Plants depend on animals and animals depend on plants. How?

(a) Plants cannot get water without animals
(b) Plants use carbon dioxide for preparing food and animals give out carbon dioxide during respiration. Thus a balance is maintained in the oxygen –carbon dioxide level.
(c) Plants and animals cannot live without food and shelter.
(d)None of the above.

Question :Question : Air is a/an

(a) mixture
(b) element
(c) compound
(d) None of these

Question : Which of the following component of air cannot be taken directly by plants?

(a) Nitrogen
(b) None of these
(c) Oxygen
(d) Carbon dioxide

Question : Wind mill is used

(a) All of these
(b) to draw water from tubewells
(c) to generate electricity
(d) to run flour mills

Question : In which of the following cities would there be maximum water vapour in the air on a sunny day in December?

(a) Mumbai
(b) Delhi
(c) Srinagar
(d) Bhopal