Physics
Grade-9
Easy
Question
Given below is a table showing the values of the coefficients of thermal expansions of some materials. Answer the question based on the table.
Sagar is provided with a brass rod and a lead rod of identical dimensions. He heats the rods through the same temperature increase. Which rod would expand more?
| Substance | Coefficient of Expansion Per Degree Centigrade |
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
- Brass
- Lead
- Both brass and lead would expand equally
- Any of them
Hint:
Expansion is directly propotional to Coefficient of linear expansion
The correct answer is: Lead
When two identical rods (same length ) are of different material and heated to same rise in temperature, the lead rod will expand more than brass rod since expansion depends on nature of material.
(Coefficient of linear expansion of lead rod > brass )
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