Class 2 What does Air have
Choose the Correct option
What is the primary gas present in the air that is essential for breathing?
- Nitrogen
- Oxygen
- Carbon dioxide
- Hydrogen
What happens when wet clothes are hung out to dry in the sun?
- They become colder
- They freeze
- Water in the clothes turns into water vapor
- They become wetter
What are the tiny particles that can be seen dancing in sunlight coming through a window?
- Oxygen molecules
- Water droplets
- Dust particles
- Carbon dioxide molecules
What is a potential harm caused by the presence of smoke in the air?
- Enhanced air quality
- Health problems
- Improved breathing
- Increased oxygen levels
What are the very small harmful living things present in the air?
- Insects
- Birds
- Germs
- Plants
Which gas is necessary for burning and is present in the air?
- Carbon dioxide
- Nitrogen
- Oxygen
- Hydrogen
How does water vapor get into the air?
- Through the process of evaporation
- Through the process of condensation
- Through the process of freezing
- Through the process of sublimation
What do animals and plants use oxygen for?
- To produce water vapor
- To produce carbon dioxide
- To breathe and stay alive
- To create sunlight
Answers:
b) Oxygen
c) Water in the clothes turns into water vapor
c) Dust particles
b) Health problems
c) Germs
c) Oxygen
a) Through the process of evaporation
c) To breathe and stay alive
Short question and answer
Q: What is the main gas present in the air that is important for breathing?
A: Oxygen.
Q: What happens to water in wet clothes when they’re hung out in the sun?
A: It turns into water vapor and becomes part of the air.
Q: Why do we sometimes see dust particles in sunlight passing through a window?
A: Dust particles reflect light, making them visible in sunlight.
Q: How does smoke from burning wood and other sources affect air quality?
A: It makes the air dirty and can be harmful to health.
Q: What are germs, and how can they impact us?
A: Germs are tiny harmful living things in the air that can cause illnesses if they enter our bodies.
Q: What is the role of carbon dioxide in the air?
A: It’s released by animals during respiration and is used by plants for photosynthesis.
Q: How does water turn into water vapor and enter the air?
A: Through a process called evaporation.
Q: What happens when the sun’s heat interacts with water in rivers and lakes?
A: It causes the water to evaporate and become water vapor in the air.
Q: Why is oxygen important for both breathing and burning?
A: Oxygen supports the combustion process and is essential for the breathing of most living organisms.
