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chapter 7 Air Form 1

Total questions: 62

Worksheet time: 36mins

Name
Class
Date
1.

Gas P is

a)

Oxygen

b)

Nitrogen

c)

Carbon dioxide

d)

Inert gas

2.

Gas Q is

a)

Oxygen

b)

Carbon dioxide

c)

Nitrogen

d)

Inert gas

3.

Gas R is

a)

Oxygen

b)

Nitrogen

c)

Carbon dioxide

d)

Inert gas

4.

Gas S is

a)

Oxygen

b)

Inert gas

c)

Carbon dioxide

d)

Nitrogen

5.

importance of gas P

a)

Help to produce nitric acid and ammonia

b)

Photosynthesis

c)

Respiration

d)

Fire extinguisher

6.

What will happen if percentage of S increase ?

a)

Temperature increases

b)

Thinning of ozone layer

7.

Why air is considered a mixture ?

a)

Each gas has no color, so cannot be differentiate

b)

Each gas still shows its original properties when separated.

8.

The gas is used to fill up light bulbs

a)

Helium

b)

Neon

c)

Argon

9.

The gas is used to fill up light bulbs

a)

Helium

b)

Neon

c)

Argon

10.

Carbon cycle maintain this gas in the air

a)

Nitrogen

b)

Carbon monoxide

c)

Carbon dioxide

11.

A layer that surrounds the Earth

a)

Atmosphere

b)

Cloud

c)

Sky

12.

The gas is needed in combustion

a)

Carbon dioxide

b)

Oxygen

c)

Hidrogen

13.

What is environmental problem shown?

a)

Covid 19

b)

Haze

c)

Greenhouse effect

14.

Two effect of the problems from the picture

a)

Causes breathing difficulties and cough

b)

Can cause lung cancer

c)

The visibility distance is limited/ shorter.

d)

Can cause greenhouse effect

15.

The road accident rate increase when this happen. Why?

a)

Causes breathing difficulties and cough

b)

The visibility distance is limited / shorter.

16.

Why oxygen level decrease in cave?

a)

decay of organisms ike dead bats in the cave

b)

the space in cave is very small

c)

respiration of bats or other animals inside the cave

17.

What advantage of people use torch instead of torchlight?

a)

It is brighter

b)

To know the presence of oxygen

18.

The air is made up of _____% Nitrogen.

a)

87

b)

78

c)

76

19.

How to test the presence of Oxygen?

a)

Use lime water

b)

Use glowing wooden splinter

c)

Use burning wooden splinter

d)

Use litmus paper

20.

How to test the presence of Hydrogen?

a)

Use burning wooden splinter

b)

Use glowing wooden splinter

c)

Use litmus paper

d)

Use limewater

21.

Oxygen helps in __________.

(more than 1 answer)

a)

Photosynthesis

b)

Combustion

c)

Make dry ice

d)

Make carbonated drinks

e)

Respiration

22.

____________ helps in photosynthesis.

a)

Inert gas

b)

Oxygen

c)

Carbon dioxide

d)

Nitrogen

23.

Plants absorb吸收 _________ and

releases释放 _________ during photosynthesis.

a)

Nitrogen , Carbon dioxide

b)

Oxygen, Carbon dioxide

c)

Nitrogen , Oxygen

d)

Carbon dioxide , Oxygen

e)

Carbon dioxide , Nitrogen

24.

Inhaled吸入 air has _________ carbon dioxide than exhaled呼出 air.

a)

more

b)

less

25.

Which process does not produce产生 Carbon dioxide?

a)

Decomposition

b)

Photosynthesis

c)

Combustion

d)

Respiration

26.

Too much carbon dioxide in the atmosphere causes导致 __________.

(more than 1 answer)

a)

Global warming

b)

More rain

c)

Air pollution

d)

Greenhouse effect

27.

Plants carry out进行 photosynthesis to produce ________ and _________.

a)

Carbon dioxide , food

b)

Oxygen , Nitrogen

c)

Oxygen , food

d)

Oxygen , carbon dioxide

28.

What is this process?

a)

combustion

b)

decomposition

c)

respiration

d)

rusting

e)

photosynthesis

29.

Which picture represents代表 respiration?

a)
b)
c)
d)
30.

Carbon + Oxygen → ____________

a)

Water

b)

Nitrogen

c)

Carbon dioxide

d)

Hydrocarbon

31.

Which fire extinguisher is suitable适合 to put at home?

a)

water

b)

carbon dioxide

c)

foam

d)

dry powder

e)

dry sand

32.

Which on is not a way to prevent避免 fire?

a)

Install fire alarm

b)

Keep away flammable things from fire

c)

Plug in many electrical appliances to a single source

d)

Keep matches and lighter in a safe place

33.

Which is not the conditions条件 of combustion?

a)

Oxygen

b)

Carbon dioxide

c)

Heat

d)

Fuel

34.

Sulphur dioxide and Nitrogen dioxide causes导致 ____________.

a)

Greenhouse effect

b)

Global warming

c)

Acid rain

d)

Thinning of ozone layer

35.

What is the percentage composition of nitrogen in air?

a)

78%

b)

75%

c)

86%

36.

Plants use ________________ for photosynthesis.

a)

Chlorine

b)

Nitrogen

c)

Carbon dioxide

37.

_______________ is one of the most abundantly found gases on earth.

a)

Oxygen

b)

Carbon dioxide

c)

Nitrogen

38.

______________ is a combustible gas.

a)

Nitrogen

b)

Oxygen

c)

Argon

39.

Which gas makes up approximately 21% of the atmopshere?

a)

Oxygen

b)

Carbon Dioxide

c)

Argon

40.

Which gas makes up approximately 1% of the atmosphere?

a)

Carbon Dioxide

b)

Methane

c)

Argon

41.
Combustion is another word for _______________.
a)
a train
b)
a bus
c)
a dog
d)
burning
42.
What does not produce carbon dioxide?
a)
Photosynthesis
b)
Burning Fossil Fuels
c)
Animal respiration
d)
Plants decaying
43.
How do living organisms return carbon to the atmosphere in the carbon cycle?
a)
respiration and photosynthesis
b)
 decomposition and respiration
44.
A gas produced by animals during respiration that plants use for photosynthesis.
a)
Oxygen
b)
Carbon Dioxide
c)
Photosynthesis
d)
Radiation
45.
A process by which animals use oxygen and food to make energy and carbon dioxide.
a)
Respiration
b)
Photosynthesis
c)
Running
d)
Carbon
46.
If all the trees on Earth were destroyed, what would be the effect on humans?
a)
there would be a lack of food
b)
there would be a lack of oxygen
c)
there would be a lack of fresh water
d)
there would be a lack of carbon dioxide
47.
What causes an increase in the oxygen level in the atmosphere?
a)
Oxygen inhaled by animals.
b)
Oxygen released by animals.
c)
Oxygen released by plants.
d)
Oxygen taken in by animals.
48.

________________ could increase the amount of oxygen in the air.

a)

Building more houses

b)

Burning more oil

c)

Paving more streets

d)

Planting more trees

49.

What is the purpose of a fire blanket?

a)

To remove the oxygen element of the fire triangle

b)

To remove the heat element of the fire triangle

c)

To remove the fuel element of the fire triangle.

50.

A water fire extinguisher should be used when dealing with an oil fire

a)

True

b)

False

51.

The following ailments are long-term effects of air pollution EXCEPT

a)

emphysema. (hardening of lungs)

b)

lung cancer.

c)

headaches.

d)

heart disease.

52.
In a case of a fire, where should you go?
a)
Fire assembly point.
b)
Safest place you think.
c)
Go into a room with a thick door.
d)
Non of the above.
53.
The ____________________ protects people from the effects of too much ultraviolet radiation.
a)
ozone layer
b)
smog layer
c)
cloud cover
d)
temperature inversion
54.
Increase in which gas is primarily responsible for increased global warming?
a)
Carbon dioxide
b)
Water vapor
c)
Methane
d)
Nitric oxides
55.
These are two ways people can reduce air pollution.
a)
Drive vehicles that get low gas mileage / Burn trash at home
b)
Burn less fossil fuels / walk and ride bikes
c)
Create major forest fires / Use CFC's
d)
Burn styrofoam at landfills / Use more chlorine
56.
Select the natural form of air pollution.
a)
CFC's
b)
Burning Fossil Fuels
c)
Forest Fires
d)
Paints and Solvents
57.
Which of the following products contains harmful CFC's?
a)
refrigerator
b)
spray paint cans
c)
aerosol hairspray cans
d)
all of these
58.
How are people and animals affected by the hole in the ozone layer?
a)
Breathing problems
b)
Skin infections
c)
Increased cases of skin cancer
d)
Flooding due to higher temperatures
59.
What current animals are threatened because of global warming?
a)
Cows
b)
Tigers
c)
Polar Bears
d)
Elephants
60.

Name any ONE of the conditions needed for combustion. (Pls write ur ans in capital letters and no fullstop)

(a)  

61.

Oxygen cycle is a (a)   (Pls write ur ans in capital letters and no fullstop)

62.

Which type of fire extinguisher should be used to put out potassium? (Pls write ur ans in capital letters and no fullstop)

(a)  

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