universe & solar system section 6 MCQ Questions & Answers Detailed Explanation

Question : 1

The light from the Sun reaches the Earth in about—

a) 10 seconds

b) 10 minutes

c) 8 minutes

d) 8 seconds

Question : 2

Isostasy is

a) the phenomenon when the earth’s crust gains weight due to mountain building or glaciation, it deforms and sinks deeper into the mantle.

b) All are correct

c) due to which crust floats on top of the mantle like ice cubes in water.

d) the property of the continental and oceanic crust, that they have the ability to rise and sink.

Question : 3

The Earth is an oblate spheroid and not a perfect sphere. This is because

1. The Earth has a rotational motion and the rotational speed increases as one goes from the poles towards the equator.
2. The equator experiences greater gravitational pull from the sun.
3. The intensity of sunlight received at the equator is greater than that at the poles.

a) Only 3

b) All of these

c) 1 and 2

d) Only 1

Question : 4

A team of scientists at Brookhaven National Laboratory including those from India created the heaviest antimatter (anti-helium nucleus). What is/are the implication/ implications of the creation of anti-matter?

1. It will make mineral prospecting and oil exploration easier and cheaper.
2. It will help probe the possibility of the existence of stars and galaxies made of anti-matter.
3. It will help understand the evolution of the universe.

a) 3 only

b) 1, 2 and 3

c) 2 and 3

d) 1 only

Question : 5

The planet nearest to the Sun is :

a) Mars

b) Venus

c) Mercury

d) Earth

Question : 6

When the Moon size is half of the full Moon, the angle between the Sun, the Earth and the Moon is

a) 180º

b) 270º

c) 90º

d) 45º