Question

According to the pulsating theory the expansion and contraction of the universe repeats after every
A. 11 years
B. 8 billion years
C. 8 million years
D. 80 billion years

Answer 1

In this question we have to explain after how many years the universe expands and contracts according to pulsating theory. For this first we must know about pulsating theory. So in the explanation below we will first understand what pulsating theory is then we will see after how many years does the universe expands and contracts.
Complete answer:
Pulsating theory- According to pulsating theory, it is possible that at a certain time the expansion of the universe might stop by the pull of gravitation and the universe might contract also. And after it has contracted to a certain size and then an explosion would occur and then the universe will start exploding again.
This contraction and explosion of the universe gives rise to a pulsating universe. This process happens after every 80 billion years. This time is a theoretical time, as we know that the calculation of time, dealing with such data and the universe is a tedious task. As we know that there is no experimental proof of this time so we will consider this time as our final answer.
Result- Hence, from the above explanation it is clear that the expansion and contraction of the universe repeats after every 80 billion years.
Hence, option (D) is correct.

Note:
In such types of questions the theory of the topic must be clear. Only then we can answer such types of questions. As we know that the study of the universe is a tedious task. So it is very important to understand every concept carefully only then we will be able to solve such types of questions.