Available Answers

1. 1.

   Fill in the blanks.

   1. When half of the surface of the moon is visible to us, it is called ________________ moon.
   2. Moon's gravity is ________________ of that of the earth.
   3. Things float on the moon due to week ________________.
   4. Big round, hollow structures on the moon's surface are called ________________.
   5. When the entire surface of the moon illuminates, it is called a ________________ moon.
2. 2.

   Choose the correct option.

   1. The number of tides that occur in a day are ________________.
      1. 1
      2. 2
      3. 3
   2. During a solar eclipse, the ________________.
      1. earth comes between the sun and the moon
      2. moon comes between the earth and the sun
      3. any of the above
   3. The moon cannot keep an atmosphere around it due to its ________________.
      1. small size
      2. weak gravity
      3. distance from the earth
   4. The moon's surface is ________________.
      1. rough
      2. uneven
      3. both (i) and (ii)
   5. On the moon, there is ________________.
      1. no water
      2. no air
      3. both (i) and (ii)
3. 3.

   Why does the moon become very cold at night?
4. 4.

   What is a tide?
5. 5.

   Name the two types of tides.
6. 6.

   What is an artificial satellite?