universe & solar system section 9 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one of the following statements is correct with reference to our solar system?

a) The Sun contains 75 percent of the mass of the solar system

b) The diameter of the Sun is 190 times that of the Earth

c) The predominant element in the composition of Earth is silicon

d) The Earth is the densest of all the planets in our solar system

Question : 2

The black part of the moon is always calm and dark which is called

a) Area of storms

b) None of these

c) Ocean of storms

d) Sea of tranquility

Question : 3

Global Positioning System (GPS) is associated with

1. determining latitude and longitude
2. constellation of satellites
3. US system of GPS and Russian system of GLONASS
4. navigation

a) 2 and 3

b) All of these

c) 1 and 4

d) 1, 3 and 4

Question : 4

Assertion (A):
A black hole is an astronomical entity that cannot be seen by telescope.
Reason (R):
The gravitational field on a black hole is so strong that it does not allow even light to escape.
In the context of the above statements, which one of the following is correct?

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 : 5

The Moons of the Planet Jupiter were discovered by

a) Kepler

b) Copernicus

c) Galileo

d) Newton

Question : 6

Which one of the following Stars is nearest to the Earth?

a) Sun

b) Sirius

c) Alpha Centauri

d) Polaris