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

Question : 1

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 : 2

Equator is

a) forms a plane that runs perpendicular to the earth’s axis

b) all of these

c) lies exactly midway between the North and South poles

d) an imaginary line of latitude that circles the globe in an east-west direction

Question : 3

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 : 4

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

a) Sun

b) Sirius

c) Alpha Centauri

d) Polaris

Question : 5

Which parts of the Earth’s surface experience the least variation in incoming solar radiation throughout the year?

a) Tropics of Cancer and Capricorn

b) Arctic and Antarctic circles

c) Equatorial regions

d) Poles

Question : 6

Which of the following planets has the largest number of satellites or moons?

a) Earth

b) Saturn

c) Neptune

d) Jupiter