WorksheetsChapter 7 Quiz 3
Total questions: 35
Worksheet time: 26mins
Air is (a) because the composition of air combines physically and can be separated by physical method
Air is mixture because the composition of air combines __(a)__ and can be separated by __(b)__ method.
(a) physically
(a) chemically
(b) physical
(b) chemical
Gas content in the device used in the picture is ...
Oxygen
Inert gas
Nitrogen
Carbon dioxide
Gas content in the device in the picture is ...
Oxygen
Inert gas
Nitrogen
Carbon dioxide
Gas content in the making of the material in the picture is ...
Oxygen
Inert gas
Nitrogen
Carbon dioxide
Gas content in the object in the picture is ...
Oxygen
Inert gas
Nitrogen
Carbon dioxide
Characteristics of carbon dioxide that allow it to be used as a fire extinguisher. (You may choose more than one answer)
Does not support combustion
Colourless gas
Lower surrounding temperature
Decrease the concentration of oxygen
Covers the burning area so that oxygen supply is sparse
Hazardous activities that can cause fire (You may choose more than one answer)
Playing with lighter
playing with firecrackers
Ironing clothes using electrical iron
not maintaining electrical wiring
cooking food with stove
Sources of Chlorofluorocarbon (CFC) pollution (You may choose more than one answer)
Pollutants particles/gases that it emits (You may choose more than one answer)
Carbon monoxide
Smoke
Soot
CFC
Pollutant particles/gases that it emits (You may choose more than one answer)
Sulphur dioxide
Nitrogen dioxide
Soot
CFC
Air is matter
True
False
Clean air has smell and has no taste
True
False
Air is a mixture of various types of gas
True
False
The content of water vapour in the air is the same everywhere in the world
True
False
Nitrogen is the most abundant gas in the air
True
False
Organisms requires carbon element to survive.
How do animals obtain carbon element for their body?
Animal breathing carbon dioxide
Animal eat plants and other animals
Animal self produce carbon for their body
Organisms requires carbon element to survive.
How do plants obtain carbon element for their body? (You may choose more than one answer)
Green plants absorb carbon dioxide during photosynthesis
Some non-green plants absorbs carbon from dead plants and digesting insects to gain carbon
Plants self produce carbon for their body
Which of the following are the effects of excess carbon dioxide gas in the atmosphere? (You may choose more than one answer)
Causes greenhouse effect
Increases the Earth's temperature
The ozone layer becomes thin
Reduces the rate of photosynthesis in plants
Which of the following are the effects of CFC release by refrigerator and air conditioner? (You may choose more than one answer)
Causes greenhouse effect
Increases the Earth's temperature
The ozone layer becomes thin
More UV rays enter the Earth's atmosphere
Which of the following are the effects of haze caused by forest burning? (You may choose more than one answer)
Causes greenhouse effect
Reduces the light intensity that reaches the leaves
The ozone layer becomes thin
Reduces the rate of photosynthesis by the plants
What is the percentage of oxygen in our air?
21%
78%
0.03%
0.97%
Which of the following involves using nitrogren? (You may choose more than one answer)
ammonia
light bulb
fertilizer
fire extinguisher
What is meant by air pollution?
The presence of soot in the air.
The presence of smoke in the air.
The presence of dust in the air .
The presence of any pollutants in the air.
What are the effects of air pollution?
sand storms
acid rain
thinning of ozone layer
Which of the following is NOT the composition of air?
Microorganism
Argon
Ammonia
Nitrogen
Why the candle flame is extinguished when the boy blow?
The saliva from the boy put off the flame
The oxygen is removed from the flame
Why do we use water to extinguish fire?
To remove the oxygen
To remove the fuel
To remove the heat
How does the fire blanket works?
To reduce the heat and eventually extinguish the fire
To reduce the oxygen and eventually extinguish the fire
To reduce the fuel and eventually extinguish the fire
Which of the following is NOT the product of combustion?
Carbon Dioxide
Heat
Light
Oxygen
How can we reduce the problem of interference of the oxygen and carbon cycle? (You may choose more than one answer)
Avoid using excessive pesticides
Prohibit illegal logging
Do not burn forests
Deforestation
What are the three conditions needed for combustion?
(a)
Is air a Mixture or a Compound
Mixture
Compund
We can survive several hours without air
True
False
Air Pollution Is a good thing
True
False
