Imp Questions For All Chapters – General Science Class 7
In the World of Stars
Short Questions
1. What is a constellation?
→ A group of stars forming a pattern in the sky.
2. Give an example of a famous constellation.
→ Saptarshi (Great Bear), Orion (Mrug), Scorpio (Vrushchik).
3. What is a nakshatra?
→ A section of the sky where the sun appears to move.
4. How much earlier does a star rise each day?
→ 4 minutes earlier every day.
5. What is the horizon?
→ The circle where the sky seems to touch the ground.
6. What is the ecliptic?
→ The apparent path of the sun across the sky.
7. How many nakshatras are there in each season?
→ Nine nakshatras per season.
8. What is the lifecycle of a star?
→ Nebula → Star → Red Giant → Supernova → Black Hole or Neutron Star.
9. What is a nebula?
→ A cloud of gas and dust where stars are born.
10. What happens when a star dies?
→ It explodes as a supernova, then forms a black hole or neutron star.
11. What is a black hole?
→ A dense object with strong gravity that pulls in everything.
12. Why is a new moon night best for stargazing?
→ There is no moonlight, so stars appear clearer.
13. What is a supernova?
→ A massive explosion that occurs when a star dies.
14. Why does the sun appear to move in the sky?
→ Due to the earth’s rotation.
15. Can planets and stars affect human life?
→ No, science has proven that planets and stars do not influence human life.
Long Questions
1. What is the difference between a star and a planet?
→ A star produces its own light and heat, while a planet reflects light from a star and does not emit its own light.
2. What happens to a star at the end of its life?
→ A star expands into a red giant, then explodes as a supernova, and finally collapses into a neutron star or black hole.
3. Why does a star rise 4 minutes earlier each day?
→ Since the Earth moves slightly in its orbit every day, the position of stars shifts, causing them to appear 4 minutes earlier each night.
4. What is a black hole?
→ A black hole is a collapsed star with extremely strong gravity that pulls in everything around it, including light, making it invisible.
5. What precautions should be taken before stargazing?
→ Stargazing should be done away from city lights, on a new moon night, and using a telescope or binoculars for a clearer view.
6. Why do scientists reject astrology?
→ Scientists reject astrology because there is no scientific evidence that stars and planets influence human life or events.
7. What is the significance of the ecliptic?
→ The ecliptic is the apparent path of the Sun in the sky and is used to define zodiac signs and nakshatras in astronomy.
8. What happens during a supernova?
→ A supernova is a massive explosion of a dying star, releasing enormous energy and sometimes forming a neutron star or black hole.
Leave a Reply