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Science [1 Marks Each] M.C.Q.

Air Around Us · Uttarakhand Board (UBSE) STD 6 (Uttarakhand - English Medium). 159 questions.

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[1 Marks Each] M.C.Q.

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MCQ 11 Mark
DIRECTIONS: Read the passage(s) given below and answer the questions that follow Passage - The earth is surrounded by a thin layer of air. Thin layer extends upto many kilometers above the surface of earth and is called atmosphere. Which of the following statement(s) is/ are correct?
  • A
    Atmosphere is the envelope of air that surrounds the earth.
  • B
    Atmospheric gases contain nitrogen and oxygen.
  • ✓
    Both the above are correct.
  • D
    None of these.
Answer
Correct option: C.
Both the above are correct.
Both the above are correct.
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MCQ 21 Mark
Which is not a property of air?
  • A
    It occupies space.
  • B
    It is transparent.
  • C
    It is a solution.
  • ✓
    It is a compound.
Answer
Correct option: D.
It is a compound.
Air is a homogeneous solution, which occupies space and it is transparent. So air is not a compound.
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MCQ 31 Mark
DIRECTIONS: Read the passage(s) given below and answer the questions that follow Passage - If in a closed room there is some material that is burning, you may have felt suffocation. This is due to excess carbon dioxide that may be accumulating in the room. Plants and animals consume oxygen for respiration and produce carbon dioxide. Which of the following is consumed by plants and animals during respiration?
  • ✓
    Oxygen.
  • B
    Nitrogen.
  • C
    Carbon dioxide.
  • D
    None of these.
Answer
Correct option: A.
Oxygen.
Oxygen.
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MCQ 41 Mark
Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain:
  • A
    Water vapour.
  • B
    Only oxygen gas.
  • ✓
    Air.
  • D
    None of these.
Answer
Correct option: C.
Air.
The bubbles contain air because soil absorbs some amount of air. The air is present in the spaces between the soil particles.
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MCQ 51 Mark
Which of the following statement is correct?
  • A
    $\frac{2}{3}\Big|$part is nitrogen and $\frac{1}{3}\Big|\text {rd}$ part is oxygen.
  • B
    $\frac{3}{4}\Big|$part is oxygen and $\frac{1}{4}\Big|$ part is nitrogen.
  • C
    $\frac{1}{2}\Big|$ part is oxygen and $\frac{1}{2}\Big|$ part is nitrogen and other.
  • ✓
    $\frac{1}{5}\big|$part is oxygen and $\frac{4}{5}\Big|$ part is nitrogen and other gases.
Answer
Correct option: D.
$\frac{1}{5}\big|$part is oxygen and $\frac{4}{5}\Big|$ part is nitrogen and other gases.
$\frac{1}{5}\big|$part is oxygen and $\frac{4}{5}\Big|$ part is nitrogen and other gases.
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MCQ 61 Mark
Which gas cylinder do Mountaineers carry with them when climbing?
  • A
    Nitrogen
  • B
    Carbon dioxide
  • ✓
    Oxygen
  • D
    Helium
Answer
Correct option: C.
Oxygen
Oxygen
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MCQ 71 Mark
Which of the following plants do not have stomata? $(i)$ Hydrilla $(ii)$ Water lily $(iii)$ All of these:
  • ✓
    Only $(ii)$ is correct.
  • B
    Both $(i)$ and $(iii).$
  • C
    Only $(i)$ is incorrect.
  • D
    Only $(iii)$ is correct.
Answer
Correct option: A.
Only $(ii)$ is correct.
Only $(ii)$ is correct.
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MCQ 81 Mark
Mountaineers carry oxygen ________ with them, while climbing mountains.
  • A
    Bag
  • B
    Mask
  • C
    Filer
  • ✓
    Cylinder
Answer
Correct option: D.
Cylinder
As we climb higher altitude the air pressure and oxygen content in the air reduces.
To avoid suffocation at higher altitude mountaineers carry oxygen cylinder with them.
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MCQ 91 Mark
Which of the following statement(s) is/ are correct?
  • A
    Air plays an important role in water cycle.
  • B
    Birds can fly due to presence of air.
  • ✓
    Both the above are correct.
  • D
    None of these.
Answer
Correct option: C.
Both the above are correct.
Both the above are correct.
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MCQ 101 Mark
DIRECTIONS: Read the passage$(s)$ given below and answer the questions that follow Passage - Until eighteenth century, people thought that air was just one substance. Now it has been experiment all proved that it is really not so. Air is a mixture of gases. Air is
  • A
    A mixture of liquids.
  • B
    A mixture of liquid and gases.
  • ✓
    A mixture of gases.
  • D
    None of these.
Answer
Correct option: C.
A mixture of gases.
A mixture of gases.
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MCQ 111 Mark
Which gas dissolve in water that helps in breathing aquatic organism?
  • A
    Carbon dioxide
  • ✓
    Oxygen
  • C
    Sulpher dioxide
  • D
    Nitrogen
Answer
Correct option: B.
Oxygen
Oxygen gas dissolved in water helps in breathing for aquatic organisms using gills.
In aquatic animals the lungs are converted to gills which helps in respiration.
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MCQ 121 Mark
Lime water turns milky when exposed to air. This shows that air contains:
  • ✓
    Carbon dioxide.
  • B
    Hydrogen.
  • C
    Nitrogen.
  • D
    Oxygen.
Answer
Correct option: A.
Carbon dioxide.
Carbon dioxide in air turns lime water milky.
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MCQ 131 Mark
Boojha took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottles slightly and made the following observations.
  1. Bubbles of air came out from the bottle.
  2. Some water entered the bottle.
  3. Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water.
  4. No bubble formed, only water entered the bottle.
Which observation is/are correct?
  • A
    $(iii)$ and $(iv)$
  • B
    $(iv)$ only
  • ✓
    $(i)$ and $(ii)$
  • D
    $(i)$ only
Answer
Correct option: C.
$(i)$ and $(ii)$
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MCQ 141 Mark
Envelope of air that surrounds the earth is known as:
  • A
    Biosphere.
  • ✓
    Atmosphere.
  • C
    Environment.
  • D
    Ecosystem.
Answer
Correct option: B.
Atmosphere.
Air is all around us, a thick layer of air surrounds the earth, this blanket of air is called atmosphere.
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MCQ 151 Mark
The gas used by aquatic animals for respiration?
  • A
    Dissolved nitrogen.
  • B
    Dissolved oxygen.
  • ✓
    Dissolved air.
  • D
    None of these.
Answer
Correct option: C.
Dissolved air.
Dissolved air.
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MCQ 161 Mark
Which of the following statements is incorrect?
  • A
    All living things require air to breathe.
  • B
    We can feel air but we cannot see it.
  • C
    Moving air makes it possible to fly a kite.
  • ✓
    Air is present everywhere but not in soil.
Answer
Correct option: D.
Air is present everywhere but not in soil.
Air is present everywhere even in the soil. Oxygen is trapped in the soil and is helpful for organisms present in the soil for breathing.
Note: The animals which live in soil and the plant roots which grow in soil need oxygen to breathe.
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MCQ 171 Mark
The percentage of water vapour present in air is called:
  • A
    Density.
  • ✓
    Humidity.
  • C
    Mass.
  • D
    Solubility.
Answer
Correct option: B.
Humidity.
The percentage of water vapour present in the air is called humidity.
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MCQ 181 Mark
Which of the following statement(s) is/ are correct?
  • A
    Air is present everywhere.
  • B
    We can feel air.
  • ✓
    Both the above.
  • D
    None of these.
Answer
Correct option: C.
Both the above.
Both the above.
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MCQ 191 Mark
DIRECTIONS: Read the passage(s) given below and answer the questions that follow Passage - Until eighteenth century, people thought that air was just one substance. Now it has been experiment all proved that it is really not so. Air is a mixture of gases. Air:
  • ✓
    Contains gases and solids.
  • B
    Contains gases and liquids.
  • C
    Contains no solid or liquid.
  • D
    All of the above.
Answer
Correct option: A.
Contains gases and solids.
Air contains some dust particles which are solids.
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MCQ 201 Mark
Which of the following gases cause the harmful greenhouse effect?
  • A
    Hydrogen
  • B
    Oxygen
  • ✓
    Carbon dioxide
  • D
    Nitrogen
Answer
Correct option: C.
Carbon dioxide
High levels of carbon dioxide in the atmosphere cause the harmful greenhouse effect.
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MCQ 211 Mark
Observe the given figure.

What is the purpose of this experiment?
  • ✓
    To show that air has mass.
  • B
    To show that air has oxygen.
  • C
    To show that we can only feel air.
  • D
    To show that air is compressible.
Answer
Correct option: A.
To show that air has mass.
The purpose of this experiment is to prove that air has mass.
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MCQ 221 Mark
DIRECTIONS: Match Column$-I $ with Column$-II$ and select the correct answer using the codes given below the columns.
S.No.
Column $-I$ 
S.No.
Column $-II$
$A.$
Oxygen.
$(p)$
Consumed by plants and animals during photosynthesis.
$B.$
Carbon dioxide.
$(q)$
Produced by animals during respiration.
$C.$
Atmosphere.
$(r)$
Animals that live under water.
$D.$
Aquatic animals.
$(s)$
Thin layer of air that surrounds the earth.
  • A
    $A \rightarrow (p); B \rightarrow (q); C \rightarrow (r); D \rightarrow (s).$
  • ✓
    $A \rightarrow (q); B \rightarrow (p); C \rightarrow (s); D \rightarrow (r).$
  • C
    $A \rightarrow (p); B \rightarrow (q); C \rightarrow (s); D \rightarrow (r).$
  • D
    $A \rightarrow (q); B \rightarrow (p); C \rightarrow (r); D \rightarrow (s).$
Answer
Correct option: B.
$A \rightarrow (q); B \rightarrow (p); C \rightarrow (s); D \rightarrow (r).$
$A \rightarrow (q); B \rightarrow (p); C \rightarrow (s); D \rightarrow (r).$
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MCQ 231 Mark
Which of the following statement is incorrect?
  • A
    All living things require air to breathe.
  • B
    We can feel air but we cannot see it.
  • ✓
    Air is present everywhere but not in soil.
  • D
    Moving air makes it possible to fly a kite.
Answer
Correct option: C.
Air is present everywhere but not in soil.
Air is present everywhere but not in soil.
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MCQ 241 Mark
Take an empty glass bottle. Turn it, upside down. Now, dip the open mouth of the bottle into the bucket filled with water. Now tilt the bottle slightly. You can see bubbles coming out of the bottle or hear any bubbly sound. Which of the following cannot be inferred from this activity?
  • A
    Air is everywhere. It is present even in the empty bottle.
  • B
    Air does not have any colour and it is transparent
  • ✓
    Air has weight
  • D
    Air occupies space
Answer
Correct option: C.
Air has weight
Air has weight
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MCQ 251 Mark
For which of the following processes is air essential?
$(i)$
Respiration
$(ii)$
Combustion
$(iii)$
Burning
  • A
    Only $(i)$ and $(ii)$
  • B
    Only $(ii)$ and $(iii)$
  • C
    Only $(i)$ and $(iii)$
  • ✓
    $(i), (ii)$ and $(iii).$
Answer
Correct option: D.
$(i), (ii)$ and $(iii).$

Air is essential for respiration, combustion and burning.

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MCQ 261 Mark
Which of the following statements is true regarding the earth's atmosphere?
  • A
    It gets denser with an increase in the altitude.
  • ✓
    It gets thinner with an increase in the altitude.
  • C
    It remains the same.
  • D
    It contains no solid particles.
Answer
Correct option: B.
It gets thinner with an increase in the altitude.
The density of air decreases with an increase in altitude.
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MCQ 271 Mark
Which gas present in the atmosphere allows substances to burn?
  • A
    Carbon dioxide
  • ✓
    Oxygen
  • C
    Nitrogen
  • D
    Ozone
Answer
Correct option: B.
Oxygen
Oxygen
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MCQ 281 Mark
The correct ascending order of gases as per their composition in air is:
  • A
    Oxygen $<$ carbon dioxide $<$ nitrogen.
  • ✓
    Hydrogen $<$ oxygen $<$ nitrogen.
  • C
    Nitrogen $<$ hydrogen $<$ oxygen.
  • D
    Oxygen $<$ carbon dioxide $<$ hydrogen.
Answer
Correct option: B.
Hydrogen $<$ oxygen $<$ nitrogen.
The correct ascending order of gases as per their composition in air is hydrogen and other gases $(1\%),$ oxygen $(21\%)$ and nitrogen $(78\%).$
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MCQ 291 Mark
Which of the following activities help in in- creasing the content of water vapour in air?
  • A
    Transpiration.
  • B
    Evaporation.
  • C
    Respiration.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
Transpiration, respiration and evaporation help in increasing the content of water vapour in air.
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MCQ 301 Mark
Which of the constituents of air on increasing, causes global warming?
  • A
    Nitrogen
  • B
    Oxygen
  • C
    Inert gases
  • ✓
    Carbon dioxide
Answer
Correct option: D.
Carbon dioxide
Carbon dioxide traps the reflected rays of the sun that fall on the earth's surface. This results in the increase of the earth's temperature, which is referred as global warming.
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MCQ 311 Mark
Rita fixed a candle at the bottom of a trough containing water. After lighting the candle, she inverted a gas jar over it. What did she observe?
  • A
    The flame continued to burn and water rose in the jar.
  • ✓
    The flame was put off and water rose in the jar.
  • C
    The flame continued to burn and water became milky.
  • D
    The flame was put off and black smoke was deposited on the sides of the jar.
Answer
Correct option: B.
The flame was put off and water rose in the jar.
The flame of the candle goes on burning till there is oxygen available in the jar. After sometime, when all the oxygen is exhausted, candle flame goes off and water from the trough rises into the jar to replace the oxygen gas consumed.
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MCQ 331 Mark
Which of the choices can best fill in the boxes $I$ and $II$ given below$?$
  • A
    $I-$carbon dioxide, $II-$oxygen.
  • B
    $I-$oxygen, $II-$respiration.
  • ✓
    $I-$respiration, $II-$carbon dioxide.
  • D
    $I-$respiration, $II-$oxygen.
Answer
Correct option: C.
$I-$respiration, $II-$carbon dioxide.

During photosynthesis in plants, oxygen is released which is taken in by human beings and animals for respiration. They in turn release carbon dioxide needed for photosynthesis by plants.

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MCQ 341 Mark
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.
  • ✓
    The hair and mucus in our nostrils trap soot and dust particles present in the air.
  • D
    It is natural phenomenon.
Answer
Correct option: C.
The hair and mucus in our nostrils trap soot and dust particles present in the air.
The hair and mucus in our nostrils trap soot and dust particles present in the air.
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MCQ 351 Mark
Which of the following gas we use in breathing?
  • A
    Carbon dioxide.
  • B
    Nitrogen.
  • ✓
    Oxygen.
  • D
    None of these.
Answer
Correct option: C.
Oxygen.
We use oxygen and produce carbon dioxide.
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MCQ 361 Mark
Which of the following enables us to drink a liquid through a straw?
  • A
    Humidity
  • B
    Temperature
  • ✓
    Atmospheric pressure
  • D
    Composition of air
Answer
Correct option: C.
Atmospheric pressure
When a straw is used for drinking, air is expelled out from the straw due to which there is a decrease in the air pressure inside the straw. Therefore, the liquid in the container enters the straw, rises up and comes out from the straw. So, we are able to drink the juice/liquid. When we stop using the straw the process stops.
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MCQ 371 Mark
Which of the following statement(s) is/ are correct?
  • A
    Air is a mixture of many gases.
  • B
    Air is a homogeneous mixture.
  • C
    Air is a pure substance.
  • ✓
    Only $(a)$ and $(b)$ are correct.
Answer
Correct option: D.
Only $(a)$ and $(b)$ are correct.

Air is not a pure substance. A pure substance refers to an element or a compound and not a mixture. Air is a homogeneous mixture.

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MCQ 381 Mark
Which of the following methods need air?
  • A
    Hand picking
  • B
    Sieving
  • ✓
    Winnowing
  • D
    Filtration
Answer
Correct option: C.
Winnowing
Winnowing is a method used by farmers to separate grains like wheat or rice and husk. Moving air blows away the husk which is lighter than the grain.
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MCQ 391 Mark
Match the following terms in Column$-l$ with those in Column$-II$ correctly.
S.No.
Column$-I$
S.No.
Column$-II$
$a.$
Aquatic animals
$1.$
Sail boat
$b.$
Mountaineers
$2.$
Soot and dust
$c.$
Factories
$3.$
Oxygen cylinders
$d.$
Wind
$4.$
Dissolved oxygen
  • A
    $a − 1, b − 2, c − 3, d − 4.$
  • B
    $a − 2, b − 1, c − 4, d − 3.$
  • C
    $a − 3, b − 4, c − 1, d − 2.$
  • ✓
    $a − 4, b − 3, c − 2, d − 1.$
Answer
Correct option: D.
$a − 4, b − 3, c − 2, d − 1.$
The correct combination is $a - 4, b - 3, c - 2, d - 1$
$(i)$ Aquatic animals-Dissolved oxygen
$(ii)$ Mountaineers-Oxygen cylinders
$(iii)$ Factories-Soot and dust
$(iv)$ Wind-Sail boat.
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MCQ 401 Mark
Which of the following statement(s) is/ are correct?
  • A
    We make use of wind energy to rotate a wind mill.
  • B
    Windmill is used to generate electricity.
  • C
    Windmill is used to run flour mills.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
All of the above.
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MCQ 411 Mark
Which of the following can show the direction of the wind?
  • A
    An anemometer.
  • B
    A wind mill.
  • ✓
    A windvane.
  • D
    A barometer.
Answer
Correct option: C.
A windvane.
A wind vane is used to find the direction of the wind.
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MCQ 421 Mark
Which of the following statement(s) is/ are correct?
  • A
    Plants and animals are interdependent.
  • B
    Plants and animals depend on each other for exchange of oxygen.
  • C
    Plants and animals depend on each other for exchange of carbon dioxide.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
All of the above.
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MCQ 431 Mark
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.
  • ✓
    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.
Answer
Correct option: B.
The rain fills up the space between soil particles. The air comes out; Hence earthworms come out for breathing.
The rain fills up the space between soil particles. The air comes out; Hence earthworms come out for breathing.
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MCQ 441 Mark
Given below are some applications of compressed air.
$(i)$
Tyres
$(ii)$
Sprayers
$(iii)$
Gas cylinders
In which of the following is compressed air used?
  • A
    Only $(i)$ and $(ii)$
  • B
    Only $(ii)$ and $(iii)$
  • C
    Only $(i)$ and $(iii)$
  • ✓
    $(i), (ii)$ and $(iii)$
Answer
Correct option: D.
$(i), (ii)$ and $(iii)$

Compressed air is used for filling inflating tyres, sprayers and gas cylinders.

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MCQ 451 Mark
Which of the following statement(s) is/ are correct?
  • A
    Air is not a matter as it cannot be seen.
  • B
    Air is incompressible.
  • ✓
    Air exerts pressure.
  • D
    All of the above.
Answer
Correct option: C.
Air exerts pressure.
Air is a matter and it is highly compressible.
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MCQ 461 Mark
The gas produced by green plants during photosynthesis is:
  • A
    Carbon dioxide
  • B
    Nitrogen
  • C
    Ozone
  • ✓
    Oxygen
Answer
Correct option: D.
Oxygen
Oxygen
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MCQ 471 Mark
What can be said about the nature of air?
  • A
    Air is heterogeneous.
  • B
    Air is a compound.
  • ✓
    Air is homogeneous.
  • D
    Air is an alloy.
Answer
Correct option: C.
Air is homogeneous.
Air is a mixture of several gases. It is homogeneous in nature.
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MCQ 481 Mark
Which of the following statement(s) is/ are correct?
  • A
    The animals that live under water cannot use the atmospheric air for their respiration.
  • B
    The aquatic animals do not need air for respiration.
  • C
    The aquatic animals use carbon dioxide dissolved in water for their respiration.
  • ✓
    All the above are incorrect.
Answer
Correct option: D.
All the above are incorrect.
Aquatic animals use dissolved air (or oxygen) in water for their respiration.
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MCQ 491 Mark
Removal of water from plant bodies in the form of vapours is called:
  • A
    Photosynthesis
  • B
    Condensation
  • C
    Respiration
  • ✓
    Transpiration
Answer
Correct option: D.
Transpiration
Transpiration
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MCQ 501 Mark
The proportion of oxygen and carbon dioxide in the atmosphere is maintained by:
  • A
    Plants.
  • B
    Animals.
  • C
    Machines.
  • ✓
    Both $(a)$ and $(b).$
Answer
Correct option: D.
Both $(a)$ and $(b).$

During respiration in animals, oxygen is taken in and carbon dioxide is released. During photosynthesis in plants, carbon dioxide is absorbed and oxygen is released. The proportion of oxygen and carbon dioxide in the atmosphere is maintained both by plants and animals.

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