Current Electricity Test

Result

Current Electricity Test - 55

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Weekly Quiz Competition

Question 1
4 / -1

A battery has e.m.f. 4 V and internal resistance r. When this battery is connected to an external resistance of 2 ohm, a current of 1 amp. flows in the circuit. How much current will flow if the terminals of the battery are connected directly ?

A
1 amp

B
2 amp

C
4 amp

D
Infinite

Solution
Question 2
4 / -1

Two batteries A and B each of e.m.f. 2 V are connected in series to an external resistance R =1 ohm. If the internal resistance of battery A is 1.9 ohm and that of B is 0.9 ohm, what is the potential difference between the terminals of battery A?

A
2 V

B
3.8 V

C
Zero

D
None of the above

Solution
Question 3
4 / -1

When a resistor of 11 Ω is connected in series with an electric cell, the current flowing in it is 0.5 A. Instead, when a resistor of 5 Ω is connected to the same electric cell in series, the current increases by 0.4 A. The internal resistance of the cell is

A
1.5 Ω

B
2Ω

C
2.5Ω

D
3.5Ω

Solution
Question 4
4 / -1

Consider four circuits shown in the figure below. In which circuit power dissipated is greatest (Neglect the internal resistance of the power supply)

A

B

C

D

Solution
Question 5
4 / -1

A cell of constant e.m.f. is first connected to a resistance R₁ and then connected to a resistance R₂. If power delivered in both cases is equal, then the internal resistance of the cell is

A

B

C

D

Solution
Question 6
4 / -1

The n rows each containing m cells in series are joined in parallel. Maximum current is taken from this combination across an external resistance of 3 Ω resistance. If the total number of cells used are 24 and internal resistance of each cell is 0.5 Ω then

A
m = 8, n = 3

B
m = 6, n = 4

C
m = 12, n = 2

D
m = 2, n = 12

Solution
Question 7
4 / -1

The figure shows a network of currents. The magnitude of currents is shown here. The current I will be

A
3 A

B
9 A

C
13 A

D
19 A

Solution
Question 8
4 / -1

The maximum power drawn out of the cell from a source is given by (where r is internal resistance)

A
E²/2r

B
E²/4r

C
E²/r

D
E²/3r

Solution
Question 9
4 / -1

Find out the value of current through 2 Ω resistance for the given circuit

A
5 A

B
2 A

C
Zero

D
4 A

Solution
Question 10
4 / -1

An energy source will supply a constant current into the load if its internal resistance is

A
Zero

B
Non-zero but less than the resistance of the load

C
Equal to the resistance of the load

D
Very large as compared to the load resistance