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

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

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Machine Design
Machine screws are

Similar to stud
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Used to prevent relative motion between two parts
Slotted for a screw driver and generally used with a nut

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