2015 · Q29
A metallic plate sticks firmly on the mouth of a water vessel made from another metal. By way of heating, one can detach the plate from the vessel. This is because heat expands
General KnowledgePhysics
- Athe vessel only
- Bboth the vessel and the plate equally
- Cthe vessel more than the plate
- Dthe vessel and contracts the plate
Explanation
The plate and the vessel are made of different metals with different coefficients of thermal expansion. On heating, the mouth of the vessel expands more than the plate, loosening the plate so it can be detached. Hence heat expands the vessel more than the plate — option C.