Question : The layer of the atmosphere in which Radio Waves are reflacted back is called :

Option 1: ionosphere

Option 2: troposphere

Option 3: stratosphere

Option 4: exosphere

Question : A level of the atmosphere which is composed partly of electrons and positive ions is called

Option 1: Troposphere

Option 2: Ionosphere

Option 3: Stratosphere

Option 4: Mesosphere

Question : What is the maximum water vapour content in the atmosphere?

Option 1: 2 to 3 percent

Option 2: 3 to 4 percent

Option 3: 4 to 5 percent

Option 4: 5 to 6 percent

Question : Comprehension:

In the following passage, some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each number.

Human activities are changing Earth's natural greenhouse 1.________. Burning fossil fuels like coal and oil puts 2._______ carbon dioxide into our atmosphere. NASA has 3.________ increase in the amount of carbon dioxide and some other greenhouse gases in 4.__________ atmosphere. Too much of these greenhouse gases can 5._________ Earth's atmosphere to trap more and more heat. This causes Earth to warm up.

Question:

Select the most appropriate option to fill in the blank No. 1.

Option 1: effect

Option 2: affect

Option 3: aspect

Option 4: impact

Question : Comprehension:
In the following passage, some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each number.

Human activities are changing Earth's natural greenhouse 1. _________. Burning fossil fuels like coal and oil puts 2. _________carbon dioxide into our atmosphere. NASA has 3.__________increase in the amount of carbon dioxide and some other greenhouse gases in 4. ___________atmosphere. Too much of these greenhouse gases can 5. __________Earth's atmosphere to trap more and more heat. This causes Earth to warm up.

Question:
Select the most appropriate option to fill in the blank No. 4.

Option 1: its

Option 2: our

Option 3: their

Option 4: ours

Question : Comprehension:
In the following passage, some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each number.

Human activities are changing Earth's natural greenhouse 1. _________. Burning fossil fuels like coal and oil puts 2. _________carbon dioxide into our atmosphere. NASA has 3.__________increase in the amount of carbon dioxide and some other greenhouse gases in 4. ___________atmosphere. Too much of these greenhouse gases can 5. __________Earth's atmosphere to trap more and more heat. This causes Earth to warm up.

Question:
Select the most appropriate option to fill in the blank No. 2.

Option 1: much

Option 2: more

Option 3: many

Option 4: most