Please give some MCQ questions of the ch Air.
Class 7.
Answers
Explanation:
Question 1.
Which gas released in the atmosphere creates a greenhouse effect trapping the heat?
(a) Carbon dioxide
(b) Oxygen
(c) Nitrogen
(d) All of these
Answer
Question 2.
Excess amount of CO2 is responsible for
(a) global cooling
(b) global warming
(c) both (a) and (b)
(d) none of these
Answer
Question 3.
What are the important objects for survival of plants and animals?
(a) Rainfall
(b) Sun light
(c) Oxygen
(d) All of these
Answer
Question 4.
Which one of the following gases is present in the atmosphere in the highest amount?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Lithium
Answer
Question 5.
Which gas is used by the green plants to make their food?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) None of these
Answer
Question 6.
Which is the important gas used by human beings for breathing?
(a) Nitrogen
(b) Carbon dioxide
(c) Oxygen
(d) Sodium chlorideQuestion 7.
When the air is heated it becomes
(a) Lighter?
(b) Heavier?
(c) Colder?
(d) None of these
Explanation:
Question 1.
Which gas released in the atmosphere creates a greenhouse effect trapping the heat?
(a) Carbon dioxide
(b) Oxygen
(c) Nitrogen
(d) All of these
Question 2.
Excess amount of CO2 is responsible for
(a) global cooling
(b) global warming
(c) both (a) and (b)
(d) none of these
Question 3.
What are the important objects for survival of plants and animals?
(a) Rainfall
(b) Sun light
(c) Oxygen
(d) All of these
Question 4.
Which one of the following gases is present in the atmosphere in the highest amount?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Lithium
Question 5.
Which gas is used by the green plants to make their food?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) None of these
Question 6.
Which is the important gas used by human beings for breathing?
(a) Nitrogen
(b) Carbon dioxide
(c) Oxygen
(d) Sodium chloride
Question 7.
When the air is heated it becomes
(a) Lighter?
(b) Heavier?
(c) Colder?
(d) None of these
Question 8.
What is the average height of the troposphere?
(a) 3 km
(b) 6 km
(c) 9 km
(d) 13 km
Question 9.
As we go up in troposphere layer of the atmosphere the pressure
(a) increases
(b) decreases
(c) no change
(d) all of these
Question 10.
Which one of the following gases protects us from harmful sun’s rays?
(a) Ozone
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
Question 11.
Which of the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
Question 12.
Which element of weather is measured in degree Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
Question 13.
The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
Question 14.
Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
Question 15.
What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
Question 16.
Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
Question 17.
Rain, snow sleet or hail are the different forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:
1. Earth is surrounded by a blanket of air called ………….
Answer
2. Green plants produce …………. during photosynthesis.
Answer
3. Increased volume of ………….. is affecting the earth’s weather and climate.
Answer
4. Ionosphere is the part of ……………
Answer
5. Amount of rainfall is measured by ………….
Answer
6. Insolation influences the distribution of …………….
Answer
State whether the given statements are true or false.
1. Hot air is dense and heavy and cold air is lighter and expands.
Answer
2. Without Greenhouse effect earth would have been too cold to live.
Answer
3. Ionosphere contains the ozone layer.
Answer
4. Helium and hydrogen float from exosphere into space.
Answer
5. Wind-vane shows the direction of wind.
Answer
6. Air moves from high pressure to low pressure.