-
question_answer1)
Which of the following processes need oxygen?
A)
Combustion done
clear
B)
Respiration done
clear
C)
Oxidation done
clear
D)
All of the above done
clear
View Solution play_arrow
-
question_answer2)
Which of the following statements is true regarding the earth's atmosphere?
A)
It gets denser with an increase in the altitude. done
clear
B)
It gets thinner with an increase in the altitude. done
clear
C)
It remains the same. done
clear
D)
It contains no solid particles. done
clear
View Solution play_arrow
-
question_answer3)
When we heat water, we find bubbles coming from it. This shows that
A)
water contains air. done
clear
B)
air contains water. done
clear
C)
water itself converts into bubbles. done
clear
D)
water contains dissolved minerals. done
clear
View Solution play_arrow
-
question_answer4)
Which of the following plays a very important role in the oxygen cycle?
A)
Birds done
clear
B)
Animals done
clear
C)
Plants done
clear
D)
Soil done
clear
View Solution play_arrow
-
question_answer5)
Mountaineers carry oxygen cylinders with them because
A)
oxygen supports combustion. done
clear
B)
oxygen is less at higher altitudes. done
clear
C)
more oxygen is needed to cook food. done
clear
D)
oxygen does not support combustion. done
clear
View Solution play_arrow
-
question_answer6)
Which of the following can show the direction of the wind?
A)
An anemometer done
clear
B)
A wind mill done
clear
C)
A windvane done
clear
D)
A barometer done
clear
View Solution play_arrow
-
question_answer7)
Which of the constituents of air on increasing, causes global warming?
A)
Nitrogen done
clear
B)
Oxygen done
clear
C)
Inert gases done
clear
D)
Carbon dioxide done
clear
View Solution play_arrow
-
question_answer8)
The percentage of water vapour present in air is called
A)
density. done
clear
B)
humidity. done
clear
C)
mass. done
clear
D)
solubility. done
clear
View Solution play_arrow
-
question_answer9)
Plants require nitrogen for
A)
reproduction. done
clear
B)
photosynthesis. done
clear
C)
transpiration. done
clear
D)
their growth. done
clear
View Solution play_arrow
-
question_answer10)
Which of the following gases cause the harmful greenhouse effect?
A)
Hydrogen done
clear
B)
Oxygen done
clear
C)
Carbon dioxide done
clear
D)
Nitrogen done
clear
View Solution play_arrow
-
question_answer11)
The percentage of nitrogen in air is
A)
21%. done
clear
B)
0.1%. done
clear
C)
54%. done
clear
D)
78%. done
clear
View Solution play_arrow
-
question_answer12)
Breathing of air through our mouth is not hygienic because
A)
dust particles will enter our lungs. done
clear
B)
we will inhale more carbon dioxide. done
clear
C)
our throat will become sore. done
clear
D)
we will easily catch cold. done
clear
View Solution play_arrow
-
question_answer13)
Which of the following enables us to drink a liquid through a straw?
A)
Humidity done
clear
B)
Temperature done
clear
C)
Atmospheric pressure done
clear
D)
Composition of air done
clear
View Solution play_arrow
-
question_answer14)
The humidity of a place
A)
lies between 10% - 20 %. done
clear
B)
is always more than 50%. done
clear
C)
is always less than 80%. done
clear
D)
varies from time to time. done
clear
View Solution play_arrow
-
question_answer15)
Lime water turns milky when exposed to air. This shows that air contains
A)
carbon dioxide. done
clear
B)
hydrogen. done
clear
C)
nitrogen. done
clear
D)
oxygen. done
clear
View Solution play_arrow
-
question_answer16)
The correct ascending order of gases as per their composition in air is
A)
oxygen < carbon dioxide < nitrogen. done
clear
B)
hydrogen < oxygen < nitrogen. done
clear
C)
nitrogen < hydrogen < oxygen. done
clear
D)
oxygen < carbon dioxide < hydrogen. done
clear
View Solution play_arrow
-
question_answer17)
Air is useful for
A)
generating electricity. done
clear
B)
the dispersal of seeds. done
clear
C)
bird's flight. done
clear
D)
all of the above. done
clear
View Solution play_arrow
-
question_answer18)
Which of the following is combustible?
A)
Oxygen done
clear
B)
Carbon dioxide done
clear
C)
Hydrogen done
clear
D)
All of these done
clear
View Solution play_arrow
-
question_answer19)
Which of the following statements is true regarding the properties of air?
A)
Air is a good conductor of electricity. done
clear
B)
Air is a good conductor of heat. done
clear
C)
Air is translucent in nature. done
clear
D)
The composition of air varies from place to place. done
clear
View Solution play_arrow
-
question_answer20)
Match the following terms in Column-l with those in Column-II correctly.
Column-I | 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)
\[a-1,b-2,c-3,d-4\] done
clear
B)
\[a-2,b-1,c-4,d-3\] done
clear
C)
\[a-3,b-4,c-1,d-2\] done
clear
D)
\[a-4,b-3,c-2,d-1\] done
clear
View Solution play_arrow
-
question_answer21)
Which of the following is NOT associated with air?
A)
Having a campfire done
clear
B)
Flying a paper aeroplane done
clear
C)
Blowing out candles on a birthday cake done
clear
D)
Sunbathing at the beach done
clear
View Solution play_arrow
-
question_answer22)
The proportion of oxygen and carbon dioxide in the atmosphere is maintained by
A)
plants. done
clear
B)
animals. done
clear
C)
machines. done
clear
D)
Both (a) and (b). done
clear
View Solution play_arrow
-
question_answer23)
What can be said about the nature of air?
A)
Air is heterogeneous. done
clear
B)
Air is a compound. done
clear
C)
Air is homogeneous. done
clear
D)
Air is an alloy. done
clear
View Solution play_arrow
-
question_answer24)
Which of the choices can best fill in the boxes I and II given below?
A)
l-carbon dioxide, II-oxygen done
clear
B)
l-oxygen, II-respiration done
clear
C)
l-respiration, II-carbon dioxide done
clear
D)
l-respiration, II-oxygen done
clear
View Solution play_arrow
-
question_answer25)
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. done
clear
B)
The flame was put off and water rose in the jar. done
clear
C)
The flame continued to burn and water became milky. done
clear
D)
The flame was put off and black smoke was deposited on the sides of the jar. done
clear
View Solution play_arrow
-
question_answer26)
Wind mills produce energy and convert it into
A)
heat energy. done
clear
B)
light energy. done
clear
C)
sound energy. done
clear
D)
electrical energy. done
clear
View Solution play_arrow
-
question_answer27)
What is the percentage of carbon dioxide present in air?
A)
0.3% done
clear
B)
0.03% done
clear
C)
0.003% done
clear
D)
1% done
clear
View Solution play_arrow
-
question_answer28)
Which of the following activities help in in- creasing the content of water vapour in air?
A)
Transpiration done
clear
B)
Evaporation done
clear
C)
Respiration done
clear
D)
All of the above done
clear
View Solution play_arrow
-
question_answer29)
When a person is caught with fire, he or she is wrapped in a thick blanket so as to
A)
cut off the oxygen supply. done
clear
B)
cut off the nitrogen supply. done
clear
C)
keep the body cool. done
clear
D)
cut off the inert gases supply. done
clear
View Solution play_arrow
-
question_answer30)
Air moves with great speed during
A)
drought. done
clear
B)
cyclones. done
clear
C)
volcanic eruptions. done
clear
D)
floods. done
clear
View Solution play_arrow
-
question_answer31)
An animal placed in an air tight jar is kept in sunlight as shown in the figure.
How can the animal be helped to survive for a longer time?
A)
By placing another mouse in it done
clear
B)
By placing a green plant in it done
clear
C)
By removing all the air through a vacuum pump done
clear
D)
By placing a burning candle in it done
clear
View Solution play_arrow
-
question_answer32)
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) done
clear
B)
Only (ii) and (iii) done
clear
C)
Only (i) and (iii) done
clear
D)
(i), (ii) and (iii) done
clear
View Solution play_arrow
-
question_answer33)
The amount of water vapour in air is greater in
A)
the rainy season. done
clear
B)
the dry season. done
clear
C)
the summer season. done
clear
D)
the autumn season. done
clear
View Solution play_arrow
-
question_answer34)
In the given figure, a burning candle is kept in the trough containing water. It is put off after some time when covered by an inverted gas jar.
What can be concluded from the above activity?
A)
Oxygen is 1/5th the volume of air. done
clear
B)
The ratio of oxygen and nitrogen in air is 1 : 4. done
clear
C)
Oxygen is required for burning the candle. done
clear
D)
All of the above done
clear
View Solution play_arrow
-
question_answer35)
Which of the following gases is the component of air?
A)
Hydrogen done
clear
B)
Oxygen done
clear
C)
Nitrogen done
clear
D)
All of the above done
clear
View Solution play_arrow
-
question_answer36)
Which of the following is the most abundant element in the earth's crust?
A)
Nitrogen done
clear
B)
Oxygen done
clear
C)
Silicon done
clear
D)
Hydrogen done
clear
View Solution play_arrow
-
question_answer37)
Which of the following activities releases carbon dioxide into the atmosphere?
A)
Respiration done
clear
B)
Burning done
clear
C)
Photosynthesis done
clear
D)
Both (a) and (b) done
clear
View Solution play_arrow
-
question_answer38)
Which of the following gases when de-creased in the air causes breathing faster?
A)
Nitrogen done
clear
B)
Oxygen done
clear
C)
Carbon dioxide done
clear
D)
Inert gases done
clear
View Solution play_arrow
-
question_answer39)
Glass panes usually appear hazy because
A)
water vapour settles on tiny dust particles on glass surfaces. done
clear
B)
chemical reactions take place on the glass surfaces. done
clear
C)
it is the property of all transparent substances. done
clear
D)
they have been used over a long time. done
clear
View Solution play_arrow
-
question_answer40)
Observe the given figure.
What is the purpose of this experiment?
A)
To show that air has mass. done
clear
B)
To show that air has oxygen. done
clear
C)
To show that we can only feel air. done
clear
D)
To show that air is compressible. done
clear
View Solution play_arrow
-
question_answer41)
Which of the following is true about air?
(i) Air is a mixture of several gases. |
(ii) Air exerts pressure. |
(iii) The composition of air is constant in all places. |
A)
Only (i) and (ii) done
clear
B)
Only (ii) and (iii) done
clear
C)
Only (i) and (iii) done
clear
D)
(i), (ii) and (iii) done
clear
View Solution play_arrow
-
question_answer42)
In which of the following processes do plants require carbon dioxide?
A)
Photosynthesis done
clear
B)
Transpiration done
clear
C)
Growth done
clear
D)
Reproduction done
clear
View Solution play_arrow
-
question_answer43)
Carbon dioxide gas can be tested by using
(i) blue litmus paper. |
(ii) lime water. |
(iii) burning splinter. |
A)
Only (i) and (ii) done
clear
B)
Only (ii) and (iii) done
clear
C)
Only (i) and (iii) done
clear
D)
(i), (ii) and (iii) done
clear
View Solution play_arrow
-
question_answer44)
Which of the following gases in air helps burning?
A)
Oxygen done
clear
B)
Nitrogen done
clear
C)
Carbon dioxide done
clear
D)
Methane done
clear
View Solution play_arrow
-
question_answer45)
For which of the following processes is air essential?
(i) Respiration |
(ii) Combustion |
(iii) Buring |
A)
Only (i) and (ii) done
clear
B)
Only (ii) and (iii) done
clear
C)
Only (i) and (iii) done
clear
D)
(i), (ii) and (iii) done
clear
View Solution play_arrow
-
question_answer46)
In an experiment shown by the class teacher, the side of the ruler which holds the inflated balloon dips as compared to the balloon without air.
What is the conclusion drawn from this experiment?
A)
Balloon with air has greater force of gravity. done
clear
B)
Air has definite mass. done
clear
C)
Masses of the balloons are different. done
clear
D)
Balloon has more matter than air. done
clear
View Solution play_arrow
-
question_answer47)
Which of the following methods need air?
A)
Hand picking done
clear
B)
Sieving done
clear
C)
Winnowing done
clear
D)
Filtration done
clear
View Solution play_arrow
-
question_answer48)
Which of the following can reduce air pollution on roads?
A)
The widening of roads. done
clear
B)
Having more traffic lights on roads. done
clear
C)
Having less traffic lights on roads. done
clear
D)
Reducing the number of vehicles on roads. done
clear
View Solution play_arrow
-
question_answer49)
We cannot feel the pressure of atmosphere because
A)
pressure increases with decrease in altitude. done
clear
B)
pressure decreases with increase in altitude. done
clear
C)
pressure acts equally in all directions. done
clear
D)
pressure difference between atmosphere and inside our body is small. done
clear
View Solution play_arrow
-
question_answer50)
Read the two sentences given in the box.
(i) The compressed air in a tyre exerts a force large enough to lift a heavy car. |
(ii) In a syringe, the plunger compresses the liquid. |
A)
Both the statements are true. done
clear
B)
Both the statements are false. done
clear
C)
Statement (i) is true but statement is false. done
clear
D)
Statement (i) is false but statement (ii) is true. done
clear
View Solution play_arrow