NCERT Class VIII Science Solutions: Chapter 17-Stars and the Solar System Part 2

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Question 6:

The change in seasons on the earth occurs because

1. The distance between the earth and the sun is not constant.

2. The axis of rotation of the earth is parallel to the plane of its orbit.

3. The axis of rotation of the earth is perpendicular to the plane of its orbit.

4. The axis of rotation of the earth is tilted with respect to the plane of its orbit.

Answer: D

Question 7:

The first of a month is the new moon day. On fifteenth of the same month, which of the following figures would represent the phase of the moon?

Answer: A

VERY SHORT ANSWER QUESTIONS

Question 8:

Do stars emit light only during night?

Answer:

No, they emit light all the time.

Question 9:

Paheli and Boojho observe a bright object in the night sky which was not twinkling. Paheli says, it is a star and Boojho says it is a planet. Who is correct?

Answer:

Boojho is correct

Question 10:

State whether the following statements are ‘true’ or ‘false’.

1. The planet nearest to us is Jupiter.

2. All the stars are at the same distance from us.

3. The planets do not emit light of their own.

4. The planets keep changing their position with respect to stars.

5. The planet Venus appears in the eastern sky before sunrise.

6. The plane in which the earth revolves around the sun is called equatorial plane of earth.

Answer:

1. The planet nearest to us is Jupiter. (False)

2. All the stars are at the same distance from us. (False)

3. The planets do not emit light of their own. (True)

4. The planets keep changing their position with respect to stars. (True)

5. The planet Venus appears in the eastern sky before sunrise. (True)

6. The plane in which the earth revolves around the sun is called equatorial plane of earth. (False)