Question

Which of the following is not the evidence of the Big-Bang Theory?
A) The universe is getting bigger
B) Abundance of Hydrogen and Helium
C) Stars that are blue shifted
D) CMBR everywhere

Answer 1

Hint: It is a theoretical question. The concepts used are the general statement of the big-bang theory and Hubble’s law. Evidence for the big-bang theory means the other concepts and theories used to support the bi-bang theory or in other words to support the theory of the beginning of the universe.

Complete step by step answer:
The big bang theory is the most accepted theory for the origin of the universe, proposed by LeMaitre and Gammon. According to this theory, all the constituents of our universe were originally together as a single mass. A big explosion occurred at some instant and the single mass burst into a large no of fragments moving with different velocities.

The evidence for this theory is, Continuous expansion of our universe, which is supported by Hubble’s law, which states that the rate of separation of any two galaxies in the universe is directly proportional to their distance of separation.
$\theta \propto R$ where $\theta$ is the rate of separation
$R$ is the distance of separation
The CMBR or the cosmic microwave background radiation is the second evidence of the big-bang theory. The CMBR is the remnant electromagnetic waves from the early stages of the universe.

Another evidence of the big-bang theory is the abundance of primordial elements which are ${}_2^{4}He$, ${}_2^{3}He$, ${}_1^{2}H$, ${}_1^{1}H$. These elements are involved in the nuclear fusion reactions which furnish energy to the stars.
There is no evidence for the big-bang theory regarding the blue-shifting of the stars.

Therefore, Option (C) is the correct answer, because it is not evidence supporting the big-bang theory.

Note: These are theoretical questions, there is not much analysis in attempting these kind of questions. Thorough understanding and studying of class XII Modern Physics will be helpful for the student.