NCERT Class VIII Science Solutions: Chapter 17-Stars and the Solar System Part 1

Download PDF of This Page (Size: 334K)

Choose the correct answer in Question 1 - 3:

Question 1:

Which of the following is NOT a member of the solar system?

  1. An asteroid

  2. A satellite

  3. A constellation

  4. A comet

Answer: C

Explanation:

Our Solar System consists of an average star we call the Sun, the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.

It includes: the satellites of the planets; numerous comets, asteroids, and meteoroids; and the interplanetary medium.

Image result for constellation

Constellations

Image result for constellation

Thus a constellation is NOT a member of the solar system.

Question 2:

Choose the correct answer in Question: Which of the following is NOT a planet of the sun?

  1. Sirius

  2. Mercury

  3. Saturn

  4. Earth

Answer: A

The planets listed in order of their distance from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Sirius is NOT a planet of the sun. Because Sirius is so bright, it was well-known to the ancients.

Image result for Sirius

Sirius is Bright

Image result for Sirius

Question 3:

Choose the correct answer in Question: Phases of the moon occur because

  1. We can see only that part of the moon which reflects light towards us.

  2. Our distance from the moon keeps changing.

  3. The shadow of the Earth covers only a part of moon’s surface.

  4. The thickness of the moon’s atmosphere is not constant.

Answer 3:

A. we can see only that part of the moon which reflects light towards us.

Image result for we can see only that part of the moon which reflects light towards us.

Part of Moon Reflects Light Towards Earth

Image result for we can see only that part of the moon which reflects light towards us.

Question 4:

Fill in the blanks:

  1. The planet which is farthest from the Sun is ____________.

  2. The planet which appears reddish in colour is ____________.

  3. A group of stars that appear to form a pattern in the sky is known as a ____________.

  4. A celestial body that revolves around a planet is known as __________.

  5. Shooting stars are actually not ____________.

  6. Asteroids are found between the orbits of _________ and _________.

Answer:

  1. The planet which is farthest from the Sun is Neptune.

  2. The planet which appears reddish in colour is Mars.

  3. A group of stars that appear to form a pattern in the sky is known as a Constellation.

  4. A celestial body that revolves around a planet is known as Satellite.

  5. Shooting stars are actually not Stars.

  6. Asteroids are found between the orbits of Mars and Jupiter.