Science · Class 7
Winds, Storms and Cyclones
Air pressure, cyclone formation, and safety during storms.
4 sections15–25 min read6 MCQs · 2 examples
Chapter Overview
Uneven heating of atmosphere creates pressure differences and wind. This chapter covers thunderstorms, lightning safety, cyclones, tornadoes, and technology for cyclone prediction.
Wind Formation
- Land heats faster → warm air rises → low pressure
- Cool air from sea moves in — wind
- High to low pressure — air moves horizontally
Storms and Cyclones
- Thunderstorm: cumulonimbus clouds, lightning, thunder, heavy rain
- Cyclone: low pressure centre, rotating winds, coastal damage
- Eye of cyclone: calm centre; strongest winds at eyewall
Safety and Prediction
- Don't shelter under trees in lightning
- Cyclone shelters, advance warnings via satellites (INSAT)
- Tornado: funnel-shaped violent wind (rare in India)
Solved Examples
Step-by-step solutions — read each step before checking the final answer.
Wind direction
Why does paper above flame rise?
- 1Hot air lighter, rises
- 2Creates low pressure above
- 3Cool air rushes in from sides
Answer
Convection — hot air rises
Cyclone safety
Precautions during cyclone warning?
- 1Move to cyclone shelter
- 2Store food and water
- 3Secure loose objects; avoid sea
Answer
Follow government warnings; evacuate if needed
Key Points to Remember
- ✓ Anemometer measures wind speed
- ✓ Barometer measures air pressure
- ✓ Coastal areas most vulnerable to cyclones
Exam Tips
- • Draw how cyclone air rotates in Northern Hemisphere
- • List lightning safety rules
- • How do satellites help predict cyclones?
Practice MCQs — Winds, Storms and Cyclones
Test your understanding with topic-wise multiple choice questions. Explanations appear after each answer.
Question 1 of 6Score: 0/0
Wind blows from: