universe & solar system section 11 MCQ Questions & Answers Detailed Explanation

Question : 1

Consider the following statements :

1. As a rock, graphite is formed from coal by thermal metamorphism.
2. Gypsum is an example of sedimentary rock.

a) Both 1 and 2

b) Neither 1 nor 2

c) 2 only

d) 1 only

Question : 2

Consider the following two statements. One labeled as the Assertion (A) and other as Reason (R). Examine these two statements carefully and select the correct answer by using the codes given below.
Assertion (A):
Existence of human life on Venus is highly improbable.
Reason (R):
Venus has extremely high level of carbon dioxide in its atmosphere. Codes:

a) A is true, but R is false.

b) A is false, but R is true.

c) Both A and R are true, but R is not the correct explanation of A.

d) Both A and R are true and R is the correct explanation of A.

Question : 3

Chemical element found in abundance in the Earth’s crust is

a) Iron

b) Silicon

c) Aluminium

d) Oxygen

Question : 4

Study the following statements about the interior of the earth and select the correct answer from the codes given below:

1. The average density of the outer crust is 2.8.
2. The crust is separated from the mantle by the Gutenberg discontinuity.
3. There is sudden increase in the velocity of P waves along the mantle core boundary.
4. The inner core of the earth is in molten state.

a) 1 and 3

b) 3 and 4

c) 2 and 3

d) 1 and 2

Question : 5

The planet whose period of rotation is longer than the period of revolution around the sun is

a) Venus

b) Neptune

c) Mars

d) Mercury

Question : 6

Which one of the following planets is nearest to the earth?

a) Mars

b) Uranus

c) Venus

d) Mercury