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Note:
If your answer is options 2,4 Then you have to fill the OMR sheet as ‘24’
If your answer is options 1,3,4 Then you have to fill the OMR sheet as ‘134’

An object is floating in a liquid, kept in a container. The container is placed in a lift. Choose the correct option(s)
1) Buoyant force increases as lift accelerates up
2) Buoyant force decreases as lift accelerates up
3) Buoyant force remains constant as lift accelerates
4) The fraction of solid submerged into liquid does not change

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answer is 14.

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Detailed Solution

Buoyancy force when lift accelerates upwards $= V_{s} (g + a) ρ$

$V σ g = V_{s} δ g ......... (1)$

$V_{s}^{'} ρ (g + a) - V σ g = V σ a$

$V_{s}^{'} ρ g + V_{s}^{'} ρ a - V σ g = V σ a$

$V_{s}^{'} ρ g + V_{s}^{'} ρ a - V_{s} ρ g = V_{s} ρ a (Using equation (1))$

$V_{s}^{'} (g + a) = V_{s} (a + g)$

$V_{s}^{'} = V_{s}$

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