12 December 2014

Stars and The Solar System- Solved Questions with set of Question bank for Class 8th

Chapter: 17- Stars and The Solar System- Solved Question 
CBSE Pathshala: 
B1.What re the difference between stars and planets?
Ans:
Stars are:          a. luminous                   b. Stationary
Planets are :      a. Non luminous            b. Movable

B2. What re the difference between galaxy and constellation?
Ans: (i) The first difference is that a galaxy is a collection of billions of stars whereas a constellation is a collection of only a very few stars.

(ii) The second difference is that a galaxy does not form a definite pattern which resembles the shape of an animal or a human being but a constellation appears to resemble an animal or human being in its shape

B3. What are the asteroids?     
Answer: There is a large gap in between the orbits of the Mars and Jupiter. This gap is occupied by a large number of small bodies that revolve around the sun. These are called asteroids
B.4.What is meteorites? In which bodies are meteorites craters more commonly found and why?
Ans: meteorites are rocky bodies revolving around the sun. Large meteors when hit the surface of planet create craters. Meteorites craters more commonly found on those planets and moon which have no or little atmosphere to burn off the falling rocks. E.g. Moon and mercury.
B5. What is comet? How is its tail formed?
Ans:  Comet is small body of ice and dust revolving around the sun in its elongated orbit. When comet approaches the sun, it heats up and leaves behind a stream of hot glowing gases and dust particles. We see it as a tail.
B6. Why does geostationary satellite seem fixed above a point on the earth?
Ans: A satellite placed at about 3600 km above the equator completes one revolution around the sun in 24 hrs . This makes its position fixed above a point on the earth

B.7. why do other stars appear to move from east to west whereas the pole star appear to be stationary?
Ans: Pole star lies exactly above axis of the rotation of earth while other star does not. Therefore when earth rotates from west to east the star will appear to move from east to west to an observer on the earth but pole star appear stationary to same observer.
This property of pole star makes it useful to the sailors as they can locate north with the help of pole star
B8. Why Venus is hotter than mercury even if it is far away from the Sun?
Ans: Venus has highest percentage of CO2 in its atmosphere that result into greenhouse effect.
B9. why is mercury so hot during the day and cold at night?
Ans: Being close to sun, mercury turns extremely hot about 400 degree centigrade during day. As gravitational force is not enough to support hot atmosphere the temperature drops to - 200 degree centigrade.
B. 10. How far away is earth from the sun if sunlight takes 8.3 minutes to reach earth?
Ans: Time taken by sunlight to reach earth = 8.3 min = 498 sec
Speed of light = 3 x 10^8 m/s
Distance b/w earth and sun = 3 x 10^8 m/s x 498 sec = 1494 x 10^8 m

Chapter: 17- Stars and The Solar System- Question bank for Class VIII(8th)
1. Which is the smallest planet of the solar system?

2. Which is the nearest planet from the sun?

3. The planet which is called red planet is:

a. Saturn          b. mars            c. Venus                    d. Neptune

4. The star which appears stationary is:

a. Sirius             b. pole star      c. Andromeda        d. Orion

5. A group which forms definite pattern is called:

a. comet           b.constellation c. meteor                 d. meteoroid

6. What are celestial bodies?

7. What are known as phases of moon?

8. Why does moon show different phases?

9. Write the applications of artificial satellites

10. How would you locate pole star?

11. What is an orbit?

12. Which is the nearest star to us?

13. What is a satellite?

14. What makes the earth a special planet?

15. Why does earth appears blue-green from the space?

16. Name the inert planets

17. Name one outer planet.

18. What are asteroids?

19. Distinguish between a meteor and meteorite.

20. What is the tail of comet due to?

21. Draw a neat diagram of Ursa Major, Orion

22. How are artificial satellites different from natural satellites?

23. Name some artificial satellites launched by India.

24. On what days during a month can you see more stars in the sky? Give reasons.

25. What keeps the planets move around the sun in their orbits?
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