1. Which of the following statements is true about the Big

Bang theory?

a) It states that the universe is expanding at a constant rate.

b) It suggests that the universe started as a singularity and

has been expanding ever since.

c) It supports the idea that the Earth is the center of the

universe.

d) It proposes that the universe is static and unchanging.

Answer: b) It suggests that the universe started as a

singularity and has been expanding ever since.

Rationale: The Big Bang theory is widely accepted in

modern cosmology and suggests that the universe began

from a singularity and has been expanding ever since.

2. What is a light-year?

a) The amount of time it takes for light to travel in a year.

b) The distance light can travel in a year.

c) The brightness of a star.

d) The time it takes for a star to emit light.

Answer: b) The distance light can travel in a year.

Rationale: A light-year is a measure of distance rather than

time. It represents the distance that light can travel in a

vacuum in one year.

3. Which of the following bodies is primarily composed of

ice and dust?

a) Mercury