1.
The moon appears to be changing in shape everyday because 1. Moon does have its own light, rather it reflects light of the sun. 2. Hence depending upon the position of the sun, different areas of moon reflect light on different days.
2.
Venus has the high percentage of carbon dioxide in its atmosphere. Carbon dioxide traps the heat. This makes Venus the hottest planet.
3.
Option B
4.
Option A
5.
Sound can not be heard on the moon because sound needs air to travel across. Moon has no air on it.
6.
Option D
7.
Option A
8.
Option A
9.
Option B
10.
Option A
11.
Option A
12.
Option A
13.
Option B
14.
Option A
15.
Option D
16.
Option B
17.
Option A
18.
As seen from the Earth, a solar eclipse is a type of eclipse that occurs when the Moon passes between the Sun and Earth, and the Moon fully or partially blocks the Sun. Phases of the solar eclipse are 1. Partial solar eclipse - It occurs when Sun and Moon are not exactly in line and only a part of Sun can be seen. 2. The total solar eclipse occurs when Sun is totally blocked by the moon.
Total solar eclipse-
A total solar eclipse occurs when the Moon completely covers the Sun's disk.
Partial solar eclipse-
19.
A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). 1. Partial lunar eclipse- occur only when the shadow of Earth covers the Moon partially. 2. Total lunar eclipse- occur when the shadow of Earth covers the Moon completely.
20.
An artificial satellite is a man-made object launched into the orbit of planet or moon using rockets. eg Sputnik-1 was the first artificial satellite launched by Russia.
