Class 8 Science - BIHAR
Pressure Winds Storms and Cyclones
In this chapter, Class 8 Bihar Board students will explore the fascinating properties of air, focusing on how moving air creates wind and how air exerts pressure. The chapter explains the relationship between wind speed and air pressure, detailing how high-speed winds result in reduced air pressure. Students will learn about natural phenomena like thunderstorms and devastating cyclones, along with the destruction they cause. Crucially, the chapter highlights safety measures and modern forecasting tools like satellites and radars. This is a high-yield topic for Bihar Board exams, frequently tested through conceptual questions and diagram-based problems.
Start Learning FreeKey Concepts
Air Pressure
Air exerts pressure in all directions around us, which increases as we move closer to the Earth's surface.
Wind Speed and Air Pressure
High-speed winds are always accompanied by a reduced air pressure in that specific region.
Convection Currents
Warm air expands and rises up because it is lighter, while cooler, heavier air rushes in to take its place, creating wind currents.
Thunderstorms
Thunderstorms develop in hot, humid tropical areas where rising temperatures create strong upward-moving winds.
Cyclones
A cyclone is a violently rotating storm system characterized by a calm, low-pressure center called the eye, surrounded by rapidly spinning high-speed winds.
Safety Measures
Precautions during storms include avoiding shelter under isolated trees, staying away from electric poles, and listening to weather warnings.
Important Formulas
Board Exam Info
In the Bihar Board Class 8 Science examination, this chapter usually carries around 5 to 8 marks. Questions frequently include short-answer questions about the formation of cyclones, differences between air pressure at high and low altitudes, and multiple-choice questions on safety measures during storms.
Frequently Asked Questions
Why do roofs of houses blow away during high-speed winds?
High-speed winds blowing over a roof create a region of low pressure above it. Since the air pressure inside the house is much higher, it pushes the roof upwards, causing it to blow away.
What is the center of a cyclone called?
The calm, low-pressure center of a cyclone is called the 'eye' of the cyclone.
How does uneven heating on the Earth cause wind?
Uneven heating between the equator and poles, or between land and water, causes warm air to rise and cool air to move in and replace it, creating wind currents.
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