Question

22. An empty glass is inverted and
lowered 20 cm into a trough of water, a
trough of oil, a trough of mercury and a
trough of iodine. Given that the densities
of water, oil mercury and iodine are
1000 kg m , 800 kg m-' and 5000 kg m
respectively, in which liquid will the
length of air column in the cup be the
shortest?
(A)Water
(B)Oil
(C)Mercury (D)Iodine
​

Answer 1

Answer:

C

Explanation:

Density of mercury is the highest and

has the smallest depth in the four

liquids.

Mercury will exert the most

pressure on the cup due to compressed air.

The high pressure caused by the

mercury will cause the trapped air to be

compressed most resulting the shortest

air column