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Directions Q. 6 to 10: Read the following text and answer the following questions on the basis of the same:

Grand Unification Theory;

There are four fundamental forces in the universe

•Gravitational force

•Electromagnetic force

•The weak nuclear force

•The strong nuclear force

The weak and strong forces are effective only over a very short range and dominate only at the level of subatomic particles.

Gravitational force and Electromagnetic force have infinite range.

The Four Fundamental Forces and their strengths

(i) Gravitational Force - Weakest force; but has infinite range.

(ii) Weak Nuclear Force - Next weakest; but short range,

(iii) Electromagnetic Force - Stronger, with infinite range.

(iv) Strong Nuclear Force - Strongest; but short range.

Unification:

•The weak nuclear force and electromagnetic force have been unified under the Standard Electroweak Theory, (Glashow, Weinberg and Salaam were awarded the Nobel Prize for this in

1979).

•Grand unification theories attempt to treat both strong nuclear force and electroweak force under the same mathematical structure.

•Theories that add gravitational force to the mix and try to unify all four fundamental forces into a single force are called Superunified Theories. It has not yet been successful.

What are the 4 fundamental forces?

A) Gravitational force, electromagnetic force, nuclear force. Tension force

B) Gravitational force, electromagnetic force, nuclear force, Frictional force

C) Gravitational force, electromagnetic force, weak nuclear force, strong nuclear force

D) Frictional force, electric force, nuclear force, magnetic force