Current Electricity Test

Result

Current Electricity Test - 163

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Weekly Quiz Competition

Question 1
4 / -1

In the circuit as shown in the figure, the heat produced by 6 ohm resistance due to current flowing in it is 60 calorie per second. The heat generated across 3 ohm resistance per second will be

A
30 calorie

B
60 calorie

C
100 calorie

D
120 calorie

Solution
Question 2
4 / -1

A 500 W heating unit is designed to operate from a 115 volt line. If the line voltage drops to 110 volt, the percentage drop in heat output will be

A
10.20%

B
8.1%

C
8.6%

D
7.6%

Solution
Question 3
4 / -1

A heater of 220 V heats a volume of water in 5 minute time. A heater of 110 V heats the same volume of water in

A
5 minutes

B
8 minutes

C
10 minutes

D
20 minutes

Solution
Question 4
4 / -1

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20° C? The temperature of boiling water is 100° C

A
0.63 minutes

B
6.3 minutes

C
12.6 minutes

D
12.8 minutes

Solution
Question 5
4 / -1

If a wire of resistance 20 Ω is covered with ice and a voltage of 210 V is applied across the wire, then the rate of melting of ice is

A
0.85 g/s

B
1.92 g/s

C
6.56 g/s

D
All of these

Solution
Question 6
4 / -1

Four identical electrical lamps are labelled 1.5 V, 0.5 A which describes the condition necessary for them to operate at normal brightness. A 12 V battery of negligible internal resistance is connected to lamps as shown, then

A
The value of R for normal brightness of each lamp is (3/4) Ω

B
The value of R for normal brightness of each lamp is (21/4) Ω

C
Total power dissipated in circuit when all lamps are normally bright is 24 W

D
Power dissipated in R is 21 W when all lamps are normally bright

Solution
Question 7
4 / -1

A 100 W bulb B₁, and two 60-W bulbs B₂ and B₃, are connected to a 250 V source, as shown in the figure. Now W₁, W₂ and W₃ are the output powers of the bulbs B₁, B₂ and B₃, respectively. Then

A
W₁ > W₂ = W₃

B
W₁ > W₂ > W₃

C
W₁ < W₂ = W₃

D
W₁ < W₂ < W₃

Solution
Question 8
4 / -1

The three resistances of equal values are arranged in different combinations shown below. Arrange them in increasing order of power dissipation

A
III < II < W < I

B
II < III < IV < I

C
I < lV < III < II

D
I < III < II < IV

Solution
Question 9
4 / -1

Silver and copper voltameters are connected in parallel with a battery of e.m.f. 12 V. In 30 minutes, lg of silver and 1.8g of copper are liberated. The power supplied by the battery is
(Z_Cu = 6.6 × 10^–4 g/C and Z_Ag = 11.2 × 10^–4 g/C)

A
24.13 J/sec

B
2.413 J/sec

C
0.2413 J/sec

D
2413 J/sec

Solution
Question 10
4 / -1

A silver voltameter of resistance 2 ohm and a 3 ohm resistor are connected in series across a cell. If a resistance of 2 ohm is connected in parallel with the voltameter, then the rate of deposition of silver

A
Decreases by 25%

B
Increases by 25%

C
Increases by 37.5%

D
Decreases by 37.5%

Solution