6 th std Science Air Lesson- Unit 4 -- 2024 new
Multiple Choice Questions (MCQ) - 25 Questions
What is the main component of air?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Argon
Answer: b) NitrogenWhich gas is essential for human respiration?
a) Carbon dioxide
b) Nitrogen
c) Oxygen
d) Argon
Answer: c) OxygenWhich process is responsible for oxygen production in the atmosphere?
a) Photosynthesis
b) Respiration
c) Combustion
d) Evaporation
Answer: a) PhotosynthesisWhich layer of the atmosphere protects us from harmful UV rays?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
Answer: b) StratosphereWhich gas is primarily responsible for the greenhouse effect?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Helium
Answer: c) Carbon dioxideAir pressure is measured by a device called a:
a) Thermometer
b) Hygrometer
c) Barometer
d) Anemometer
Answer: c) BarometerWhat is the lowest layer of the atmosphere?
a) Stratosphere
b) Thermosphere
c) Troposphere
d) Mesosphere
Answer: c) TroposphereWhich gas makes up around 21% of the Earth’s atmosphere?
a) Nitrogen
b) Oxygen
c) Argon
d) Carbon dioxide
Answer: b) OxygenWhich gas do plants need for photosynthesis?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Argon
Answer: c) Carbon dioxideThe process of water vapor turning into liquid is called:
a) Evaporation
b) Condensation
c) Sublimation
d) Transpiration
Answer: b) CondensationWhich layer of the atmosphere contains the ozone layer?
a) Troposphere
b) Mesosphere
c) Stratosphere
d) Exosphere
Answer: c) StratosphereThe most abundant gas in Earth's atmosphere is:
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Argon
Answer: b) NitrogenWhich layer is known as the weather layer?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Exosphere
Answer: a) TroposphereThe term 'humidity' refers to the amount of ______ in the air.
a) Water vapor
b) Oxygen
c) Nitrogen
d) Carbon dioxide
Answer: a) Water vaporWhich instrument measures wind speed?
a) Thermometer
b) Anemometer
c) Barometer
d) Hygrometer
Answer: b) AnemometerIn which layer do most airplanes fly?
a) Stratosphere
b) Troposphere
c) Mesosphere
d) Exosphere
Answer: a) StratosphereWhich gas helps in burning?
a) Nitrogen
b) Carbon dioxide
c) Argon
d) Oxygen
Answer: d) OxygenWhat percentage of the atmosphere is nitrogen?
a) 21%
b) 78%
c) 1%
d) 0.03%
Answer: b) 78%The weight of air creates:
a) Humidity
b) Air pressure
c) Wind speed
d) Temperature
Answer: b) Air pressureThe atmospheric layer where meteors burn up is:
a) Mesosphere
b) Troposphere
c) Exosphere
d) Stratosphere
Answer: a) MesosphereWhich gas do animals exhale?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Argon
Answer: b) Carbon dioxideThe process by which plants release oxygen is called:
a) Photosynthesis
b) Respiration
c) Combustion
d) Transpiration
Answer: a) PhotosynthesisAir is a mixture of gases with about _____% oxygen.
a) 78%
b) 21%
c) 1%
d) 0.03%
Answer: b) 21%Which atmospheric layer is the farthest from Earth?
a) Troposphere
b) Stratosphere
c) Exosphere
d) Mesosphere
Answer: c) ExosphereWhat is the main purpose of the ozone layer?
a) To protect us from meteors
b) To trap heat
c) To block harmful UV rays
d) To provide oxygen
Answer: c) To block harmful UV rays
Fill in the Blanks - 25 Questions
Air is a mixture of ______.
Answer: gasesThe most abundant gas in the atmosphere is ______.
Answer: nitrogenOxygen is essential for ______.
Answer: respirationPlants produce oxygen through ______.
Answer: photosynthesisThe layer of the atmosphere closest to Earth is the ______.
Answer: troposphereThe ______ layer contains the ozone layer.
Answer: stratosphere______ is the process by which water vapor turns into liquid.
Answer: CondensationAir has ______, which exerts pressure.
Answer: weightThe gas essential for combustion is ______.
Answer: oxygen______ is measured with a barometer.
Answer: Air pressureThe process of water turning into vapor is called ______.
Answer: evaporationThe gas used by plants for photosynthesis is ______.
Answer: carbon dioxideThe ______ protects Earth from harmful UV rays.
Answer: ozone layerThe layer where weather occurs is the ______.
Answer: troposphereThe measure of water vapor in the air is called ______.
Answer: humidityThe greenhouse effect is mainly caused by ______.
Answer: carbon dioxide______ is the device used to measure wind speed.
Answer: AnemometerThe coldest layer of the atmosphere is the ______.
Answer: mesosphere______ makes up 21% of the atmosphere.
Answer: OxygenThe uppermost layer of the atmosphere is the ______.
Answer: exosphereThe atmospheric layer that burns meteors is the ______.
Answer: mesosphereAnimals exhale ______.
Answer: carbon dioxideThe process by which plants release oxygen is called ______.
Answer: photosynthesis______ is necessary for life on Earth.
Answer: AirThe weight of air creates ______.
Answer: air pressure
Match the Following - 10 Questions
| Column A | Column B |
|---|---|
| 1. Photosynthesis | a) Wind speed |
| 2. Oxygen | b) 21% of atmosphere |
| 3. Anemometer | c) Plants |
| 4. Barometer | d) Burning |
| 5. Troposphere | e) Weather |
| 6. Carbon dioxide | f) Greenhouse gas |
| 7. Nitrogen | g) 78% of atmosphere |
| 8. Ozone layer | h) UV protection |
| 9. Stratosphere | i) Above troposphere |
| 10. Condensation | j) Water vapor to liquid |
Answers: 1-c, 2-b, 3-a, 4-d, 5-e, 6-f, 7-g, 8-h, 9-i, 10-j
Question and Answer - 25 Questions
What is air composed of?
Answer: Air is composed of gases like nitrogen, oxygen, carbon dioxide, argon, and small amounts of other gases.Why is oxygen important?
Answer: Oxygen is essential for respiration in humans and animals.What is photosynthesis?
Answer: Photosynthesis is the process by which plants make their food and produce oxygen using sunlight, water, and carbon dioxide.What is the role of the ozone layer?
Answer: The ozone layer protects Earth from harmful ultraviolet (UV) rays.Which layer of the atmosphere is closest to Earth?
Answer: The troposphere.How does the greenhouse effect occur?
Answer: The greenhouse effect occurs when gases like carbon dioxide trap heat in the Earth's atmosphere.What causes air pressure?
Answer: The weight of air exerts pressure on Earth’s surface.How is wind speed measured?
Answer: Wind speed is measured using an anemometer.What is humidity?
Answer: Humidity is the amount of water vapor present in the air.Why is nitrogen important for plants?
Answer: Nitrogen is essential for plant growth and is a major component of chlorophyll.
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