Machine Design
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

Increasing the cross-section area of bar
Would depend upon other factors
Decreasing the cross-section area of bar
Remain unaffected with cross-section area

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Machine Design
The designation M 33 × 2 of a bolt means

Metric threads with cross-section of 33 mm
Metric threads of 33 mm outside diameter and 2 mm pitch
Bolt of 33 mm nominal diameter having 2 threads per cm
Metric threads of 33 numbers in 2 cm

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