For astronomy and mathematics

1. Multiple choice exercises-2
1. The Earth makes a full orbit around the Sun in …
a. a month.
b. a year.
c. a day.
2. What is right basedon size?
a. Star system< Galaxy= Universe
b. Galaxy= Star system< Universe
c. Galaxy= Star system= Universe
d. Star system< Galaxy< Universe
3. How many timesbigger is the diameterof the Sun than the diameterof the Earth?
a. 5
b. 76
c. 104
d. 200
4. The moon makes a full orbit around the Earth in …
a. a week.
b. a month.
c. a day.
5. Whichsentence iscorrect?
a. The temperature of the innercore of the Earth isapproximatelyequal tothatof the surface
of the Sun.
b. The temperature of the innercore of the Earth ishigherthanthat of the core of the Sun.
c. None of the above is true.
6. At how much distance is the Earth from the Sun?
(Million kilometers)
a. 80
b. 150
c. 300
d. 600

2. 7. How long doesit take the Earth to rotate once?
a. One hour.
b. One day.
c. One month.
d. It doesn’trotate at all.
8. Whycan we see the stars in the night sky?
a. Theyproduce theirownlight.
b. Theyreflectlightfromthe Sun.
9. How many billionyearsold is the Earth?
a. 2,5
b. 4,5
c. 6
d. 9
10. How much % ofthe Earth’s surface is coveredwith water?
a. 51
b. 71
c. 81
d. 91