Important Questions: Pressure, Winds, Storms, and Cyclones | Science Curiosity Class 8 - New NCERT PDF Download

Q1: Define pressure and explain the relationship between force and pressure. Use examples from the chapter.
Ans: Pressure is the force acting on a unit area. A smaller area with the same force results in higher pressure. For example, the pointed end of a nail exerts higher pressure.

Q2: How do liquids and gases exert pressure, and does it depend on the area of contact? Provide examples.
Ans: Liquids and gases exert pressure on surfaces, and it depends on the area of contact. For instance, water exerts pressure on the sides of a container.

Q3: Explain atmospheric pressure and its magnitude. How does atmospheric pressure affect everyday objects?
Ans: Atmospheric pressure is the pressure exerted by the air around us. It is significant, as demonstrated by the difficulty of pulling a sucker off a surface due to atmospheric pressure.

Q4: How does the concept of pressure apply to our bodies, and why don't we get crushed under atmospheric pressure?
Ans: Our bodies have internal pressure that balances the external atmospheric pressure, preventing us from being crushed.

Q5: Provide examples of forces and pressure from everyday activities that Class 8 students can relate to in their daily lives.
Ans: Students can give examples like walking (muscular force), using sharp knives (pressure), playing with magnets (magnetic force), and feeling atmospheric pressure.

Q6: What causes lightning, and how did ancient civilizations interpret it?
Ans: Lightning is caused by the accumulation of charges in clouds. Ancient civilizations thought it was the wrath of gods visiting them due to their lack of understanding.

Q7: Describe the different types of electric charges and their interactions.
Ans: There are two types of charges, positive and negative. Charges of the same kind repel each other, while charges of different kinds attract each other.

Q8: How is lightning generated during a thunderstorm, and what precautions should one take during lightning?
Ans: Lightning is generated by the accumulation of positive and negative charges in clouds. Precautions during lightning include seeking shelter in buildings or vehicles, avoiding open spaces, and not using umbrellas.

Q9: Explain the purpose and functioning of lightning conductors in protecting buildings from lightning strikes.
Ans: Lightning conductors provide a path for electric charge to safely flow from a building to the ground, preventing lightning damage.

Q10: How can scientists improve our understanding of natural phenomena like lightning and earthquakes, and why is this understanding crucial?
Ans: Scientists continuously research and study these phenomena to improve our understanding and develop better safety measures. Understanding these phenomena is essential to protect lives and property.