Current Electricity Test

Result

Current Electricity Test - 104

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Weekly Quiz Competition

Question 1
4 / -1

A moving coil galvanometer has a resistance of 50 Ω and gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scaledeflection for 1A

A
50/99 Ω in series

B
50 / 99 Ω in parallel

C
0.01 Ω in series

D
0.01 Ω in parallel

Solution
Question 2
4 / -1

A galvanometer of resistance 25 Ω giving full scale deflection for a current of 10 milliampere, is to be changed into a voltmeter of range 100 V by connecting a resistance of `13.\' in series with galvanometer. Thevalue of resistance R in Ω is

A
10000

B
10025

C
975

D
9975

Solution
Question 3
4 / -1

The resistance of a galvanometer is 25 ohm and it requires 50μA for full deflection. The value of the shunt resistance required to convert it into an ammeter of 5 amp is

A
2.5 × 10^–4Ω

B
1.25 × 10^–3 ohm

C
0.05 ohm

D
2.5 ohm

Solution
Question 4
4 / -1

For comparing the e.m.f.\'s of two cells with a potentiometer, a standard cell is used to develop a potential gradient along the wires. Which of the following possibilities would make the experiment unsuccessful?

A
The e.m.f. of the standard cell is larger than the e.m.f.'s of the two cells

B
The diameter of the wires is the same and uniform throughout

C
The number of wires is ten

D
The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells
Question 5
4 / -1

In the Wheatstone\'s bridge (shown in figure) X = Y and A > B. The direction of the current between ab will be

A
From a to b

B
From b to a

C
From b to a through c

D
From a to b through c

Solution
Question 6
4 / -1

A
The galvanometer shows a deflection when switch S is closed

B
The galvanometer shows a deflection when switch S is open

C
The galvanometer shows no change in deflection whether S is open or closed

D
The galvanometer shows no deflection
Question 7
4 / -1

A resistance of 4 Ω and a wire of length 5 metres and resistance 5 Ω are joined in series and connected to a cell of e.m.f. 10 V and internal resistance 1 Ω. A parallel combination of two identical cells is balanced across 300 cm of the wire. The e.m.f. E of each cell is

A
1.5 V

B
3.0 V

C
0.67 V

D
1.33 V

Solution
Question 8
4 / -1

The resistivity of a potentiometer wire is 40 × 10^–8ohm-m and its area of cross-section is 8 × 10^–6m². If 0.2 amp current is flowing through the wire, the potential gradient will be

A
10^–2 volt/m

B
10^–1 volt/m

C
3.2 × 10^–2 volt/m

D
1 volt/m

Solution
Question 9
4 / -1

The resistance of an ideal voltmeter is

A
Zero

B
Very low

C
Very large

D
Infinite
Question 10
4 / -1

Constantan wire is used in making standard resistances because its

A
Specific resistance is low

B
Density is high

C
Temperature coefficient of resistance is negligible

D
Melting point is high