NCERT Solutions Class 8 Science Chapter 17 Stars And The Solar System
NCERT Solutions Class 8 Science Chapter 17 Stars And The Solar System: National Council of Educational Research and Training Class 8 Science Chapter 17 Solutions – Stars And The Solar System. NCERT Solutions Class 8 Science Chapter 17 PDF Download.
NCERT Solutions Class 8 Science Chapter 17: Overview
Board |
NCERT |
Class |
8 |
Subject |
Science |
Chapter |
17 |
Chapter Name |
Stars And The Solar System |
Topic |
Exercise Solutions |
NCERT Solutions Class 8 Science Chapter 17 – Stars And The Solar System
CHAPTER: – 17
(STARS AND THE SOLAR SYSTEM)
Exercise: –
Choose the correct answer in Questions 1-3.
1)Which of the following is NOT a member of the solar system?
(a) An asteroid (b) A satellite
(c) A constellation (d) A comet.
Ans: – Option(c).
Explanation-(Constellation is a group of stars)
2)Which of the following is NOT a planet of the sun?
(a) Sirius (b) Mercury
(c) Saturn (d) Earth.
Ans: – Option(a).
Explanation- (Sirius doesn’t belong to the category of planet of sun)
3)Phases of the moon occur because
(a) we can see only that part of the moon which reflects light towards us.
(b) our distance from the moon keeps changing.
(c) the shadow of the Earth covers only a part of the moon’s surface.
(d) the thickness of the moon’s atmosphere is not constant.
Ans: – Option(a).
Explanation- (As it rotates according to the rotation of the earth)
4) Fill in the blanks.
(a) The planet which is farthest from the Sun is ____Neptune_____ .
Explanation- (Pluto is not accepted as planet of sun)
(b) The planet which appears reddish in colour is ___mars_________ .
Explanation- (As it located closes to the sun as well as its colour)
(c) A group of stars that appear to form a pattern in the sky is known as a __constellation____ .
Explanation- (Number of stats after including make constellation)
(d) A celestial body that revolves around a planet is known as __satellites________.
Explanation- (A body which rotates around any planet is known as satellite like moon is the satellite of earth)
(e) Shooting stars are actually not ___meteors_________.
Explanation- (Debris in space is known as meteors)
(f) Asteroids are found between the orbits of ____Jupiter_____ and _____mars____ .
Explanation-(As this region is known as asteroid belt)
5) Mark the following statements as true (T) or false (F).
(a) Pole star is a member of the solar system. ( )
Ans: – False.
Explanation- (Pole star aligned with rotating body)
(b) Mercury is the smallest planet of the solar system.
Ans: – True.
Explanation- (As its size is as compared to the others planet)
(c) Uranus is the farthest planet in the solar system.
Ans: – False.
Explanation- (Neptune is the farthest planet)
(d) INSAT is an artificial satellite.
Ans: – True.
Explanation- (INSAT is launched by the space agency which uses in research purpose works like satellite remove the earth)
(e) There are nine planets in the solar system.
Ans: – False.
Explanation- (There are eight planets in solar system)
(f) Constellation Orion can be seen only with a telescope.
Ans: – False.
Explanation- (Its distance is far away as compared to the others)
6)Match items in column A with one or more items in column B.
Ans: –
Column A. |
Column B |
(i)Inner planet. | Mars, earth |
(ii)Outer planets. | Saturn |
(iii) Constellation. | Great bear, Orion |
(iv) Satellite of earth. | Moon |
7)In which part of the sky can you find Venus if it is visible as an evening star?
Ans: – As the Venus is known as evening star so, it must be stayed in the western side of the sky. And in this direction also sunset happen.
8)Name the largest planet of the solar system.
Ans: – Jupiter is known as the largest planet of the solar system.
9)What is a constellation? Name any two constellations.
Ans: – We have seen in the sky that all the stars make a group in which there is sometimes a specific shape known as constellation.
Example: – Orion, Ursa major.
10) Draw sketches to show the relative positions of prominent stars in
(a) Ursa Major and (b) Orion.
Ans: –
11)Name two objects other than planets which are members of the solar system.
Ans: – The members of solar system
- Comet
- Sun
- Asteroid
12)Explain how you can locate the Pole Star with the help of Ursa Major.
Ans: –
13)Do all the stars in the sky move? Explain.
Ans: – The earth is moving from west to east about its axis and all the stars are remain in same in their position. So, as the earth is moving, we thought that stars in the sky is moving.
14)Why is the distance between stars expressed in light years? What do you understand by the statement that a star is eight light years away from the Earth?
Ans: – The huge distance between the stars could not possible to measure in kilometres so this distance is measured by light, a light year is the distance travel by light in one year. If the distance between the stars five light years that means times needed to travel the light from one star to other stars is eight years.
15) The radius of Jupiter is 11 times the radius of the Earth. Calculate the ratio of the volumes of Jupiter and the Earth. How many Earths can Jupiter accommodate?
Ans: –