Machine Design
Three different weights fall from a certain height under vacuum. They will take

Times proportional to weight to reach earth
Times inversely proportional to weight to reach earth
Same time to reach earth
None of these

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

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

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