Class 12

21. Heating And Chemical Effect of Current question bank (Physics)

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Q1.

A heater coil is cut into two parts of equal length and one of them is used in the heater. The ratio of the heat produced by this half coil to that by the original coil is  

(A)
2 : 1
(B)
1 : 2
(C)
1 : 4
(D)
4 : 1
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Q2.

A constant voltage is applied on a uniform wire, then the heat so produced will be doubled, if  

(A)
The length and the radius of wire are halved
(B)
Both length and radius are doubled
(C)
Only the length is doubled
(D)
Only the radius is doubled
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