Accident drill is to be conducted once in ________ if no real accident occurs during this period.

Answer: Option D

Accident drills are mock exercises conducted by Indian Railways to simulate real accident situations.

The main objective is to ensure that railway staff are well-prepared, equipment is functional, and emergency procedures are followed correctly.

As per Indian Railways rules, if no real accident occurs during this period, an accident drill must be conducted once every 3 months.

This practice helps in maintaining readiness, improving coordination, and ensuring safety standards are consistently met.