Current Electricity Test

Result

Current Electricity Test - 28

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Weekly Quiz Competition

Question 1
4 / -1

For the post office box arrangement to determine the value of unknown resistance, the unknown resistance should be connected between

A
B and C

B
C and D

C
A and D

D
B₁ and C₁
Question 2
4 / -1

In the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor R will be

A
200Ω

B
100Ω

C
500Ω

D
1000Ω

Solution
Question 3
4 / -1

In a meter bridge experiment, the ratio of the left gap resistance to right gap resistance is 2 : 3, the balance point from left is

A
60 cm

B
50 cm

C
40 cm

D
20 cm

Solution
Question 4
4 / -1

When a metal conductor connected to the left gap of a meter bridge is heated, the balancing point

A
shifts towards right

B
shifts towards left

C
remains unchanged

D
remains at zero
Question 5
4 / -1

The maximum current that can be measured by a galvanometer of resistance 40 Ω is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer (in ohm) is

A
2010

B
4050

C
5040

D
4960

Solution
Question 6
4 / -1

An unknown resistance R₁ is connected in series with a resistance of 10 Ω. This combination is connected to one gap of meter bridge while a resistance R₂ is connected in the other gap. The balance point is at 50 cm. Now, when the 10 Ω resistance is removed the balance point shifts to 40 cm. The value of R₁ (in ohm) is

A
20

B
10

C
60

D
40

Solution
Question 7
4 / -1

In the given circuit, the voltmeter records 5 V. The resistance of the voltmeter in ohm is

A
200

B
100

C
10

D
50

Solution
Question 8
4 / -1

A moving coil galvanometer has a resistance of 10 and full scale deflection of 0.01 A. It can be converted into voltmeter of 10V full scale by connecting into resistance of

A
9.90 Ω in series

B
10 Ω in series

C
990 Ω in series

D
0.10 Ω in series

Solution
Question 9
4 / -1

Potentiometer wire of length 1 m is connected in series with 490Ω resistance and 2 V battery. If 0.2 m Vcm^-I is the potential gradient, then resistance of the potentiometer wire is

A
4.9Ω

B
7.9Ω

C
5.9Ω

D
6.9Ω

Solution
Question 10
4 / -1

A current of 0.01 mA passes through the potentiometer wire of a resistivity of 10⁹ Ω-cm and area of cross-section 10^-2cm². The potential gradient is

A
10⁹ Vm^-1

B
10¹¹ Vm^-1

C
10¹⁰ Vm^-1

D
10⁸ Vm^-1

Solution