Current Electricity Test

Result

Current Electricity Test - 166

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Weekly Quiz Competition

Question 1
4 / -1

The wiring of a house has resistance 6 Ω. A 100 W bulb is glowing. If a geyser of 1000 W is switched on, the change in potential drop across the bulb is nearly when 220 V is the supplied voltage

A
Nil

B
23 V

C
32 V

D
12 V

Solution
Question 2
4 / -1

A 12 V lead accumulator is being charged using 24 V supply with an external resistance 2 Ω. The internal resistance of the accumulator is 1 Ω. Find the time in which it will store 360 W-hour energy

A
1 hr

B
7.5 hr

C
10 hr

D
None of these

Solution
Question 3
4 / -1

In a Ag voltameter 2.68 g of silver is deposited in 10 min. The heat developed in 20 Ω resistor during the same period will be

A
192 kJ

B
192 J

C
200 J

D
132 kJ

Solution
Question 4
4 / -1

The thermo e.m.f. of a thermocouple varies with the temperature θ of the hot junction as E = a θ + bθ² in volts where the ratio a/b is 700° C. If the cold junction is kept at 0° C, then the neutral temperature is

A
700° C

B
350° C

C
1400° C

D
No neutral temperature is possible for this thermocouple

Solution
Question 5
4 / -1

In the following circuit, 5 Ω resistor develops 45 J/s due to current flowing through it. The power developed per second across 12 Ω resistor is

A
16 W

B
192 W

C
36 W

D
64 W

Solution
Question 6
4 / -1

Water of volume 2 litre in a container is heated with a coil of 1 kW at 27° C. The lid of the container is open and energy dissipates at rate of 160 J/s. In how much time temperature will rise from 27° C to 77°C [Given specific heat of water is 4.2 kJ/kg]

A
8 min 20 s

B
6 min 2 s

C
7 min

D
14 min

Solution
Question 7
4 / -1

In a copper voltameter, mass deposited in 30 second is `m\' g. If the time-current graph is as shown in figure, ECE of copper is

A
m

B
m/2

C
0.1 m

D
0.6 m

Solution
Question 8
4 / -1

Which of the following plots may represent the thermal energy produced in a resistor in a given time as a function of the electric current? U

A
a

B
b

C
c

D
d

Solution
Question 9
4 / -1

Two different metals are joined end to end. One end is kept at constant temperature and the other end is heated to a very high temperature. The graph depicting the thermo e.m.f. is

A

B

C

D

Solution
Question 10
4 / -1

Which of the following graphs shows the variation of thermoelectric power with temperature difference between hot and cold junction in thermocouples?

A

B

C

D

Solution