universe & solar system section 4 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one of the following is not a natural unit of time?

a) Standard time

b) Day

c) Lunar month

d) Tropical year

Question : 2

Carbon is the ........... most abundant element in the earth’s crust.

a) 15th

b) 16th

c) 14th

d) 13th

Question : 3

The earth is in aphelion on

a) Sept. 23

b) July 4

c) Dec. 22

d) June 21

Question : 4

Earthquakes are important in landform studies because they can trigger catastrophic events like

1. Landslides and mudflows
2. Glacier surges
3. Tsunamis causing damage and shoreline changes.

a) 1 and 2

b) 1 and 3

c) 3 only

d) 1, 2 and 3

Question : 5

Consider the following two statements, one labelled 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):
The planet Neptune appears blue in colour.
Reason (R):
The presence of Methane gas in the atmosphere of Neptune is responsible for its colour.
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 : 6

Which of the following statement(s) is/are true?

1. A planet is a celestial body that orbits a star and may or may not be a star itself
2. A planet has sufficient mass for self gravity and is roughly spherical in shape
3. A planet is formed out of fragments of rocks and metal leftovers is our solar system
4. Pluto is the smaller planet of our solar system

a) 2 and 4

b) 2, 3 and 4

c) 2 only

d) 1 and 2