Ch-4 Air ( NCERT) Grade 7 Geography

In what amount is Argon, present in the air?

• 0.28%

• 0.75%

• 0.93%

• 0.86%

What is the average height of troposphere??

• 30 km

• 18km

• 13km

• 43km

TRUE OR FALSE When air is heated it expands

• True

• False

what fraction of the Sun's heat does earth receive?

• 1 in 2,000,000,000

• 1 in 200,000,000,000

• 1 in 20,000,000

• 1 in 200,000,000

What kind of gases are present in the exosphere?

• Light gases like ARGON AND NITROGEN

• Heavyweight gases like helium and Hydrogen

• Light gases like helium and hydrogen

__________ is the second most plentiful gas in the air

• Oxygen

• Carbon dioxide

Green plants produce oxygen during __________

• Carbon dioxide

• Photosynthesis

• Green house

The standard unit of measuring temperature is____________

• Degree Celsius

• Fahrenheit

• Kelvin

Who invented degree Celsius

Which one of the following gases is present in the atmosphere in the highest amount?

• Oxygen

• Carbon dioxide

• Nitrogen

• Lithium