universe & solar system section 8 MCQ Questions & Answers Detailed Explanation

Question : 1

Who amongst the following was the first to state that the Earth was spherical?

a) Ptolemy

b) Strabo

c) Copernicus

d) Aristotle

Question : 2

Titan is the largest Moon of the Planet

a) Jupiter

b) Saturn

c) Venus

d) Mars

Question : 3

The mean radius of the Earth is

a) 8400 km

b) 12800 km

c) 6400 km

d) 3200 km

Question : 4

The causes of Day and Night is

a) Tilt of Earth’s axis

b) Moon’s rotation

c) Rotation of Earth on its axis

d) Earth-rotation

Question : 5

When there is noon at I.S.T. meridian people another place of the Earth are taking their 6 O’ clock morning tea. The longitude of the place is

a) 172°30’ E

b) 90° W

c) 7°30’ W .

d) 17°30’ E

Question : 6

Study the following statements and select the correct answer from the codes given below:

1. The average density of rocks in the lower crust of the earth is 3.
2. There is a gradual decrease in the velocity of the seismic waves through the lower crust.
3. The mantle-core boundary is marked by Moho-discontinuity.
4. The outer core of the earth is in molten form.

a) 3 and 4 are correct

b) 1 and 4 are correct

c) 2 and 3 are correct

d) 1 and 2 are correct