Current Electricity Test

Result

Current Electricity Test - 61

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Weekly Quiz Competition

Question 1
4 / -1

In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across 60 cm of the potentiometer wire. If the cell is shunted by a resistance of 6 Ω, the balance is obtained across 50 cm of the wire. The internal resistance of the cell is

A
0.5 Ω

B
0.6 Ω

C
1.2 Ω

D
1.5 Ω

Solution
Question 2
4 / -1

A voltmeter of resistance 1000 Ω gives full scale deflection when a current of 100 mA flows through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full scale deflection is

A
10000 Ω

B
9000 Ω

C
222 Ω

D
111 Ω

Solution
Question 3
4 / -1

A moving coil galvanometer of resistance 100 Ω is used as an ammeter using a resistance 0.1 Ω. The maximum deflection current in the galvanometer is 100 μA. Find the minimum current in the circuit so that the ammeter shows maximum deflection

A
100.1 mA

B
1000.1 mA

C
10.01 mA

D
1.01 m

Solution
Question 4
4 / -1

In the adjoining circuit, the e.m.f. of the cell is 2 volt and the internal resistance is negligible. The resistance of the voltmeter is 80 ohm. The reading of the voltmeter will be

A
0.80 volt

B
1.60 volt

C
1.33 volt

D
2.00 volt

Solution
Question 5
4 / -1

If the resistivity of a potentiometer wire be ρ and area of cross-section be A, then what will be potential gradient along the wire

A

B

C

D

Solution
Question 6
4 / -1

A voltmeter has resistance of 2000 ohm and it can measure upto 2 V. If we want to increase its range to 10 V, then the required resistance in series will be

A
2000 Ω

B
4000 Ω

C
6000 Ω

D
8000 Ω

Solution
Question 7
4 / -1

With a potentiometer null point were obtained at 140 cm and 180 cm with cells of e.m.f 1.1 V and one unknown X volt. Unknown e.m.f. is

A
1.1 V

B
1.8 V

C
2.4 V

D
1.41V

Solution
Question 8
4 / -1

The arrangement as shown in figure is called as

A
Potential divider

B
Potential adder

C
Potential substracter

D
Potential multiplier
Question 9
4 / -1

A potentiometer wire of length 1 m and resistance 10 Ω is connected in series with a cell of e.m.f 2 V with internal resistance 1 Ω and a resistance box including a resistance R. If potential difference between the ends of the wire is 1 mV, the value of R is

A
20000 Ω

B
19989 Ω

C
10000 Ω

D
9989 Ω

Solution
Question 10
4 / -1

In a balanced Wheatstone\'s network, the resistances in the arms Q and S are interchanged. As a result of this

A
Network is not balanced

B
Network is still balanced

C
Galvanometer shows zero deflection

D
Galvanometer and the cell must be interchanged to balance