NCERT Class VIII Science Solutions: Chapter 17-Stars and the Solar System Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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)

Answer:

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.

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.