Question

____________________ reaction takes place in the sun.
A. Nuclear Fission
B. Nuclear Fusion
C. Chemical
D. Both(A) and(B)

Answer 1

Hint: The sun shines because it can convert gravitational energy into light. The sun has a huge mass now we all know that the sun is made up of hydrogen gas. Now due to this tremendous high pressure caused by the mass of the sun the hydrogen gas which is inside gets affected resulting in four atomic nuclei of hydrogen combining into one helium atom.

Complete answer: We all know that a combination of two or more atoms into one is known as nuclear fusion. In the process of nuclear fusion, some amount of the mass of the hydrogen atoms gets converted into energy that is seen in the form of light.

Therefore the reaction that takes place in the sun is nuclear fusion.
So, the correct answer is “Option B”.

Additional Information:
There are two types of nuclear reactions one is nuclear fission another is nuclear fusion.
We can differentiate between those by:

Basis	Nuclear Fission	Nuclear Fusion
The necessity for energy	The amount of energy released in a nuclear fission reaction is much lower than the energy released during fusion.	The release of energy during nuclear fusion reaction is way higher than that of the fission reaction.
Production or usage of energy	The nuclear power plant uses this technology to produce energy	Power plant-related experiments use this technology.
The necessity for these energies	It requires less energy to divide one atom into two or more parts	It requires a huge amount of energy to combine two or more atoms into one single atom.
Reactions which takes place naturally	This type of reaction never occur in normal cases	This type of reaction takes place in the sun and stars.
The outcome of these reactions	The nuclear fission reaction produces substances that are highly radioactive.	In very few nuclear fusion reactions radioactive chemicals come out of.

Note:
Whenever we see that two or more atoms get unified into one atom we must know that it is the process of nuclear fusion. Whereas when we see that one atom is getting subdivided in two or more atoms that process is nuclear fission.