Current Electricity Test

Result

Current Electricity Test - 99

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Weekly Quiz Competition

Question 1
4 / -1

n identical cells each of e.m.f. E and internal resistance r are connected in series. An external resistance R is connected in series to this combination. The currentthrough R is

A

B

C

D

Solution
Question 2
4 / -1

A cell of internal resistance r is connected to an external resistance R. The current will be maximum in R, if

A
R = r

B
R < r

C
R > r

D
R = r/2
Question 3
4 / -1

To get the maximum current from a parallel combination of n identical cells each of internal resistance r and external resistance R, when

A
R >> r

B
R << r

C
R = r

D
None of the above

Solution
Question 4
4 / -1

Two identical cells send the same current in 2 Ω, resistance, whether connected in series or in parallel. The internal resistance of the cell should be

A
1 Ω

B
2 Ω

C

D
2.5 Ω

Solution
Question 5
4 / -1

The internal resistances of two cells shown are 0.1Ω and 0.3 Ω. If R = 0.2 Ω, the potential difference across the cell

A
B will be zero

B
A will be zero

C
A and B will be 2V

D
A will be > 2V and B will be < 2V

Solution
Question 6
4 / -1

A torch battery consists of two cells of 1.45 volt and an internal resistance 0.15 Ω. If each cell sends current through the filament of the lamps having resistance 1.5 ohm, the value of current will be

A
16.11 amp

B
1.611 amp

C
0.1611 amp

D
2.6 amp

Solution
Question 7
4 / -1

The electromotive force of a primary cell is 2 volt. When it is short-circuited it gives a current of 4 ampere. Its internal resistance in ohm is

A
0.5

B
5.0

C
2.0

D
8.0

Solution
Question 8
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
13 A

C
23 A

D
–3 A
Question 9
4 / -1

A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true?

A
Potential difference across the terminals of the battery is maximum when R = r

B
Power delivered to the resistor is maximum when R = r

C
Current in the circuit is maximum when R = r

D
Current in the circuit is maximum when R >> r
Question 10
4 / -1

Two cells having the internal resistance 0.2 Ω. and 0.4 Ω are connected in parallel. The voltage across the battery terminal is 1.5 Volt. The e.m.f. of first cell is 1.2 Volt. The e.m.f. of the second cell is

A
2.7 Volt

B
2.1 Volt

C
3 Volt

D
4.2 Volt

Solution