Railway Engineering
The object of providing a point lock is

None of these
to detect any obstruction between and tongue rail
to ensure that the point may not be operated while the train is on it
to ensure that each switch is correctly set

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Railway Engineering
On a single rail track, goods trains loaded with heavy iron material run starting from ‘A’ to ‘B’ and then empty wagons run from ‘B’ to ‘A’. The amount of creep in the rails:

Cannot be determined from the given data
Will be more in the direction of A to B
Will be more in the direction of B to A
Will be maximum at the middle of A and B

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