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NCERT Class VIII Science Solutions: Chapter 17 - Stars and the Solar System Part 2
Question 6:
The change in seasons on the earth occurs because
- The distance between the earth and the sun is not constant.
- The axis of rotation of the earth is parallel to the plane of its orbit.
- The axis of rotation of the earth is perpendicular to the plane of its orbit.
- 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’ .
- The planet nearest to us is Jupiter.
- All the stars are at the same distance from us.
- The planets do not emit light of their own.
- The planets keep changing their position with respect to stars.
- The planet Venus appears in the eastern sky before sunrise.
- The plane in which the earth revolves around the sun is called equatorial plane of earth.
Answer:
- The planet nearest to us is Jupiter. (False)
- All the stars are at the same distance from us. (False)
- The planets do not emit light of their own. (True)
- The planets keep changing their position with respect to stars. (True)
- The planet Venus appears in the eastern sky before sunrise. (True)
- The plane in which the earth revolves around the sun is called equatorial plane of earth. (False)