UPSC CSE Prelims
Question 23
The known forces of nature can be divided into four classes, viz., gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct?
View correct answer and explanation
Correct answer: A
Correct Option: A
Explanation: Of the four fundamental interactions, the strong nuclear force is strongest at nuclear scales; gravity is by far the weakest.
Option-wise Analysis:
A: Correct - Correct as the statement to reject: gravity is not strongest; it is the weakest fundamental force.
B: Incorrect - Generally true: electromagnetic interactions involve electrically charged particles, though neutral composites can have magnetic effects.
C: Incorrect - True: weak interactions cause beta radioactive decay.
D: Incorrect - True in the usual introductory account: residual strong interaction binds nucleons within nuclei.