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

Question : 1

The inexhaustible source of energy of the stars is due to

a) decay of radioactive elements

b) excess of oxygen that helps burning and release of energy

c) conversion of helium to hydrogen

d) conversion of hydrogen to helium

Question : 2

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

Question : 3

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 : 4

On which date is the earth in perihelion ?

a) January 3

b) July 4

c) Dec 22

d) June 21

Question : 5

‘Super nova’ is

a) an exploding Star

b) a black hole

c) an asteroid

d) a comet

Question : 6

The coriollis effect is produced by

a) earth’s rotation

b) earth’s rotation and revolution

c) earth’s revolution

d) pressure gradient