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RRB Group-D Model Paper 13 with answers for online practice
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© examsnet.com
Question : 19 of 100
Marks:
+1
,
-0
A free fall in true sense occurs only ______.
 In the sea
 In the atmosphere
 In air
 In vacuum
Validate
Solution:
A fall is considered as a free fall if only force acting on it was gravity.
As the vacuum contains no matter, there is no opposite force against the free fall due to gravity.
In air and atmosphere, there is aerodynamic drag and in the sea, there is a buoyancy force of water to oppose the movement due to gravity.
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