Current Electricity Test

Result

Current Electricity Test - 68

Score
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Weekly Quiz Competition

Question 1
4 / -1

In the given circuit, it is observed that the current I is independent of the value of the resistance R₆. Then the resistance values must satisfy

A

B

C

D

Solution
Question 2
4 / -1

In the given circuit, with steady current, the potential drop across the capacitor must be

A
V

B
V / 2

C
V / 3

D
2V / 3

Solution
Question 3
4 / -1

A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due to current, the temperature of the wire is raised by ∆T in time t. A number N of similar cells is now connected in series with a wire of the same material and cross-section but of length 2L. The temperature of the wire is raised by the same amount ∆T in the same time t. The value of N is

A
4

B
6

C
8

D
9

Solution
Question 4
4 / -1

What is the equivalent resistance between the points A and B of the network?

A

B

C

D

Solution
Question 5
4 / -1

The effective resistance between points P and Q of the electrical circuit shown in the figure is

A
2Rr/ (R + r)

B
8R (R + r) / (3R + r)

C
2r + 4R

D
5R/2 + 2r

Solution
Question 6
4 / -1

The current in a conductor varies with time t as I = 2t + 3t² where I is in ampere and t in seconds. Electric charge flowing through a section of the conductor during t = 2 sec to t = 3 sec is

A
10 C

B
24 C

C
33 C

D
44 C

Solution
Question 7
4 / -1

A group of N cells whose e.m.f varies directly with the internal resistance as per the equation E_N = 1.5 r_N are connected as shown in the figure below. The current I in the circuit is

A
0.51 amp

B
5.1 amp

C
0.15 amp

D
1.5 amp

Solution
Question 8
4 / -1

The resistance of a wire of iron is 10 ohm and temp, coefficient of resistance is 5 × 10^–3/° C. At 20°C it carries 30 milliampere of current. Keeping constant potential difference between its ends, the temperature of the wire is raised to 120°C . The current in milliampere that flows in the wire is

A
20

B
15

C
10

D
40

Solution
Question 9
4 / -1

Seven resistances are connected as shown in the figure. The equivalent resistance between A and B is

A
3 Ω

B
4 Ω

C
4.5 Ω

D
5 Ω

Solution
Question 10
4 / -1

A battery of internal resistance 4 Ω is connected to the network of resistances as shown. In order to give the maximum power to the network, the value of R (in Ω) should be

A
4/9

B
8/9

C
2

D
18

Solution