Current Electricity Test

Result

Current Electricity Test - 106

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Weekly Quiz Competition

Question 1
4 / -1

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

A

B

C

D

Solution
Question 2
4 / -1

A voltmeter has resistance of 2000 ohm and it can measure upto 2 V. If we want to increase its range to10 V, then the required resistance in series will be

A
2000 Ω

B
4000 Ω

C
6000 Ω

D
8000 Ω

Solution
Question 3
4 / -1

The arrangement as shown in figure is called as

A
Potential divider

B
Potential adder

C
Potential substracter

D
Potential multiplier
Question 4
4 / -1

A potentiometer wire of length 1 m and resistance 10 Ω is connected in series with a cell of e.m.f. 2V 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 5
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
Question 6
4 / -1

The ammeter A reads 2 A and the voltmeter V reads 20 V. The value of resistance R is (Assuming finite resistance\'s of ammeter and voltmeter)

A
Exactly 10 ohm

B
Less than 10 ohm

C
More than 10 ohm

D
We cannot definitely say

Solution
Question 7
4 / -1

A galvanometer of 25 Ω resistance can read a maximum current of 6mA. It can be used as a voltmeter to measure a maximum of 6 V by connecting a resistance to the galvanometer. Identify the correct choice in thegiven answers

A
1025 Ω in series

B
1025 Ω in parallel

C
975 Ω in series

D
975 Ω in parallel

Solution
Question 8
4 / -1

A galvanometer has 30 divisions and a sensitivity 16 μA/div. It can be converted into a voltmeter to read 3 V by connecting

A
Resistance nearly 6 k Ω in series

B
6 k Ω. in parallel

C
500 Ω in series

D
It cannot be converted

Solution
Question 9
4 / -1

A potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)

A
1

B
2

C
5

D
10

Solution
Question 10
4 / -1

In a circuit 5 percent of total current passes through a galvanometer. If resistance of the galvanometer is G then value of the shunt is

A
19 G

B
20 G

C

D

Solution