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Q.

[5]

The rubber sucker does not work over a rough surface because


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a

No air is removed from the sucker

b

All the air is removed from the sucker

c

The rubber does not like the rough surface

d

The rough surface has high friction 

answer is A.

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Detailed Solution

The rubber sucker does not work over a rough surface because no air is removed from the sucker.
When a rubber sucker is pressed against a smooth surface, the air inside the sucker is removed, and due to the atmospheric pressure, the sucker sticks to the surface. But in the case of a rough surface, no air is removed by the sucker, so the pressure inside and outside is the same, and the sucker never sticks to the surface.
 
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[5]The rubber sucker does not work over a rough surface because