Heating and Chemical Effect of Electric Current

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Heating and Chemical Effect of Electric Current

Test1 Max. Marks = 40

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1.Two identical heaters rated 220 V, 1000 watt are placed in series with each other across 220 V lines. If resistance do not change with temperature, then the combined power is

4 points

(a) 1000 W

(b) 2000 W

(d) 4000 W

Clear selection

2.A 100 W bulb working on 200 V and a 200 W bulb working on 100 V have

4 points

(a) Resistances in the ratio of 4 : 1

(b) Maximum current ratings in the ratio of 1:4

(d) Maximum current ratings in the ratio of 1 : 2

Clear selection

3. Two bulbs of 500 W and 200 W are manufactured to operate on 220 V line. The ratio of heat produced in 500 W and 200 W, in two cases, when firstly they are joined in parallel and secondly in series, will be

4 points

(a)

(b)

(c)

(d)

Clear selection

4.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

4 points

(a) 1:2

(b) 2:1

(d) 8:1

Clear selection

5.Electric bulb 50 W-100 V glowing at full power are to be used in parallel with battery 120 V, 10 ꭥ. Maximum number of bulbs that can be connected so that they glow in full power is

4 points

(a) 2

(b) 8

(d) 6

Clear selection

6.Two bulbs X and Y having same voltage rating and of power 40 watt and 60 watt respectively are connected in series across a potential difference of 300 volt, then

4 points

(a) X will glow brighter

(b) Resistance of Y is greater than X

(d) Voltage drop in X will be greater than Y

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7.An electric lamp is marked 60 W, 230 V. The cost of a 1 kWh of energy is Rs. 1.25. The cost of using this lamp 8 hrs a day for 30 day is

4 points

(a) Rs. 10

(b) Rs. 16

(d) Rs. 20

Clear selection

8. A 5.0 A current is setup in an external circuit by a 6.0 V storage battery for 6.0 minutes. The chemical energy of the battery is reduced by

4 points

(a) 1.08 x 10⁴ J

(b) 1.08 x 10⁻⁴ V

(d) 1.8 x 10⁴ V

Clear selection

9. If E = at + bt² what is the temperature of inversion

4 points

(a)

(b)

(c)

(d)

Clear selection

10. Consider the following two statements A and B, and identify the correct choice out of given answers

A. Thermo e.m.f. is minimum at neutral temperature of a thermocouple

B. When two junctions made of two different metallic wires are maintained at different temperatures, an electric current is generated in the circuit.

4 points

(a) A is false and B is true

(b) A is true and B is false

(d) Both A and B are true

Clear selection

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