Class 12

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

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Q1.

The approximate value of heat produced in 5 min. by a bulb of 210 watt is (J = 4.2 joule/calorie)

(A)
15,000
(B)
1,050
(C)
63,000
(D)
80,000
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Q2.

Two wires ‘A’ and ‘B’ of the same material have their lengths in the ratio \( 1 : 2 \) and radii in the ratio \( 2 : 1 \). The two wires are connected in parallel across a battery. The ratio of the heat produced in ‘A’ to the heat produced in ‘B’ for the same time is

(A)
\(1 : 2\)
(B)
\(2 : 1\)
(C)
\(1 : 8\)
(D)
\(8 : 1\)
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