NCERT Class VIII Science Solutions: Chapter 17-Stars and the Solar System Part 4

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Question 14:

In Fig mark the arrows to show the direction of sunlight.

As showing in fig is a direction of sunlight (Q)

Direction of Sunlight (Q)

As showing in fig is a direction of sunlight (Q)

Answer:

As showing in fig is a direction of sunlight (A)

Direction of Sunlight (A)

As showing in fig is a direction of sunlight (A)

SHORT ANSWER QUESTIONS

Question 15:

A star is ten light years away from the earth. Suppose it brightens up suddenly today. After how much time shall we see this change?

Answer:

We will see the change after 10 years

Question 16:

Meteors are not visible during the daytime. Explain the reason.

Answer:

The brightness of a meteor is extremely small compared to that of the sun, therefore, it is not seen during day time.

Image of what is meteors

Image of Meteors

Image of what is meteors

Question 17:

Why does the moon change its shape daily?

Answer:

It changes its shape because we see only that part of the moon from which the light of the sun is reflected towards us.

Question 18:

Paheli saw the moon through a glass window at . She marked the position of the moon on the glass pane. She got up at . in the morning. Will the moon be visible at the same position?

Answer:

No, because the position of the moon keeps changing during the night.

LONG ANSWER QUESTIONS

Question 19:

Suppose the moon emits light of its own. Would it still have phases? Justify your answer.

Answer:

No. The phases are seen because the moon does not emit its own light and reflects the light of sun.

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