CBSE Class 7 Social – MCQ and Online Tests – Unit 4 – Air
Every year CBSE students attend Annual Assessment exams for 6,7,8,9,11th standards. These exams are very competitive to all the students. So our website provides online tests for all the 6,7,8,9,11th standards’ subjects. These tests are also very effective and useful for those who preparing for any competitive exams like Olympiad etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.
These online tests are based on latest CBSE syllabus. While attempting these, our students can identify their weak lessons and continuously practice those lessons for attaining high marks. It also helps to revise the NCERT textbooks thoroughly
CBSE Class 7 Social – MCQ and Online Tests – Unit 4 – Air
Question 1.
Which one of the following gases protects us from harmful sun’s rays?
(a) Ozone
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
Answer
Answer: (a) Ozone
Question 2.
The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
Answer
Answer: (d) 100°C
Question 3.
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
Answer: (c) Nitrogen
Question 4.
Which gas is used by the green plants to make their food?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) None of these
Answer
Answer: (b) Carbon dioxide
Question 5.
Which is the important gas used by human beings for breathing?
(a) Nitrogen
(b) Carbon dioxide
(c) Oxygen
(d) Sodium chloride
Answer
Answer: (c) Oxygen
Question 6.
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
Answer: (a) Carbon dioxide
Question 7.
Excess amount of CO2 is responsible for
(a) global cooling
(b) global warming
(c) both (a) and (b)
(d) none of these
Answer
Answer: (b) global warming
Question 8.
When the air is heated it becomes
(a) Lighter?
(b) Heavier?
(c) Colder?
(d) None of these
Answer
Answer: (a) Lighter?
Question 9.
What is the average height of the troposphere?
(a) 3 km
(b) 6 km
(c) 9 km
(d) 13 km
Answer
Answer: (d) 13 km
Question 10.
As we go up in troposphere layer of the atmosphere the pressure
(a) increases
(b) decreases
(c) no change
(d) all of these
Answer
Answer: (b) decreases
Question 11.
Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
Answer
Answer: (b) Sea Level
Question 12.
What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
Answer
Answer: (a) Loo
Question 13.
Which of the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
Answer
Answer: (d) All of These
Question 14.
Which element of weather is measured in degree Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
Answer
Answer: (a) Temperature
Question 15.
What are the important objects for survival of plants and animals?
(a) Rainfall
(b) Sun light
(c) Oxygen
(d) All of these
Answer
Answer: (d) All of these
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