Current Electricity Test

Result

Current Electricity Test - 101

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Weekly Quiz Competition

Question 1
4 / -1

The e.m.f of a battery is 2 V and its internal resistance is 0.5 Ω. The maximum power which it can deliver to anyexternal circuit will be

A
8 Watt

B
4 Watt

C
2 Watt

D
None of these

Solution
Question 2
4 / -1

Kirchhoff\'s I law and II law of current, prove the

A
Conservation of charge and energy

B
Conservation of current and energy

C
Conservation of mass and charge

D
None of the above
Question 3
4 / -1

Eels are able to generate current with biological cells called electroplaques. The electroplaques in an eel are arranged in 100 rows, each row stretching horizontally along the body of the fish containing 5000 electroplaques. The arrangement is suggestively shown below. Each electroplaque has an e.m.f. of 0.15 V and internal resistance of 0.25 Ω
The water surrounding the eel completes a circuit between the head and its tail. If the water surrounding it has a resistance of 500 Ω, the current an eel can produce in water is about

A
1.5 A

B
3.0 A

C
15 A

D
30 A

Solution
Question 4
4 / -1

Current provided by a battery is maximum when

A
Internal resistance equal to external resistance

B
Internal resistance is greater than external resistance

C
Internal resistance is less than external resistance

D
None of the above
Question 5
4 / -1

A battery is charged at a potential of 15 V for 8 hours when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 hours. The mean terminal voltage during discharge is 14 V. The \"Watt-hour\" efficiency of the battery is

A
82.5%

B
80%

C
90%

D
87.5%

Solution
Question 6
4 / -1

A capacitor is connected to a cell of e.m.f. E having some internal resistance r. The potential difference across the

A
Cell is < E

B
Cell is E

C
Capacitor is > E

D
Capacitor is < E
Question 7
4 / -1

When the resistance of 9 Ω is connected at the ends of a battery, its potential difference decreases from 40 volt to 30 volt. The internal resistance of the battery is

A
6 Ω

B
3 Ω

C
9 Ω

D
15 Ω

Solution
Question 8
4 / -1

Two batteries, one of e.m.f. 18 volt and internal resistance 2 Ω and the other of e.m.f. 12 volt and internal resistance 1 Ω, are connected as shown. The voltmeter V will record a reading of

A
15 volt

B
30 volt

C
14 volt

D
18 volt

Solution
Question 9
4 / -1

Two sources of equal e.m.f. are connected to an external resistance R. The internal resistances of the two sources are R₁ and R₂ (R₂> R₁). If the potential difference across the source having internal resistanceR₂ is zero, then

A
R = R₁ R₂ / (R₁ + R₂)

B
R = R₁R₂ / (R₂– R₁)

C
R = R₂× (R₁ + R₂) / (R₂– R₁)

D
R = R₁– R₁

Solution
Question 10
4 / -1

The magnitude of i in ampere unit is

A
0.1

B
0.3

C
0.6

D
None of the above

Solution