Properties and Effects of Air

This video tutorial for standard 4 science covers lesson 9 on air and atmosphere. It discusses the composition of air, highlighting the presence of nitrogen, oxygen, and other gases. The uses of air, such as supporting life and burning, are explained. The video also explores the properties of air, including its pressure, ability to occupy space, and weight, with practical examples and activities.

What is the main topic of the lesson discussed in the video?

• Plant growth

• Solar system

• Air and atmosphere

• Water cycle

What percentage of air is composed of nitrogen?

• 50%

• 1%

• 78%

• 21%

Which gas in the air is essential for photosynthesis?

• Argon

• Carbon dioxide

• Nitrogen

• Oxygen

How does nitrogen in the air affect burning?

• It has no effect

• It controls burning

• It prevents burning

• It accelerates burning

Which of the following is a use of argon gas?

• Cooking

• Photosynthesis

• Light bulbs

• Breathing

What is one of the properties of air discussed in the video?

• Air is solid

• Air exerts pressure

• Air has no weight

• Air is visible

How does air pressure help in everyday activities?

• It helps in heating

• It helps in growing plants

• It helps in filling ink in pens

• It helps in cooking

What happens when air is blown into a balloon?

• The balloon becomes bigger

• The balloon becomes heavier

• The balloon changes color

• The balloon shrinks

What does the activity with the balloons demonstrate about air?

• Air is invisible

• Air is colorless

• Air has weight

• Air has no weight

Why can't a pencil box be closed when a blown-up balloon is inside?

• The balloon is too light

• The balloon is too colorful

• The balloon occupies space

• The balloon is too heavy