1 km
2 km
0.50 km
None of these
Answer is Right!
Answer is Wrong!
The correct answer is A. 1 km.
Long welded rails are used in railways to reduce the number of joints in the track. This makes the track smoother and more stable, which can improve safety and reduce wear and tear on the track. The length of long welded rails varies depending on the country and the type of railway. In India, the length of long welded rails is typically 1 km.
Option B is incorrect because 2 km is too long for a long welded rail. Option C is incorrect because 0.50 km is too short for a long welded rail. Option D is incorrect because it is not a valid option.