Current Electricity Test

Result

Current Electricity Test - 63

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Weekly Quiz Competition

Question 1
4 / -1

A voltmeter having resistance of 50 × 10³ ohm is used to measure the voltage in a circuit. To increase the range of measurement 3 times the additional series resistance required is

A
10⁵ ohm

B
150 k ohm

C
900 k ohm

D
9 × 10⁶ ohm

Solution
Question 2
4 / -1

In a potentiometer experiment two cells of e.m.f.\'s E₁ and E₂are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of E₂is reversed, then the balancing length becomes 29 cm. The ratio E₁/E₂ of the e.m.f. of the two cells is

A
1 : 1

B
2 : 1

C
3 : 1

D
4 : 1

Solution
Question 3
4 / -1

A milliammeter of range 10 mA has a coil of resistance 1 Ω. To use it as voltmeter of range 10 volt, the resistance that must be connected in series with it, will be

A
999 Ω

B
99 Ω

C
1000 Ω

D
None of these

Solution
Question 4
4 / -1

A 36 Ω galvanometer is shunted by resistance of 4 Ω. The percentage of the total current, which passes through the galvanometer is

A
8 %

B
9 %

C
10 %

D
91 %

Solution
Question 5
4 / -1

An ammeter and a voltmeter of resistance R are connected in series to an electric cell of negligible internal resistance. Their readings are A and V respectively. If another resistance R is connected in parallel with the voltmeter

A
Both A and V will increase

B
Both A and V will decrease

C
A will decrease and V will increase

D
A will increase and V will decrease
Question 6
4 / -1

A wire of length 100 cm is connected to a cell of e.m.f 2 V and negligible internal resistance. The resistance of the wire is 3 Ω. The additional resistance required to produce a potential drop of 1 milli volt per cm is

A
60 Ω

B
47 Ω

C
57 Ω

D
35 Ω

Solution
Question 7
4 / -1

A galvanometer of resistance 20 Ω is to be converted into an ammeter of range 1 A. If a current of 1 mA produces full scale deflection, the shunt required for the purpose is

A
0.01 Ω

B
0.05 Ω

C
0.02 Ω

D
0.04 Ω

Solution
Question 8
4 / -1

There are three voltmeters of the same range but of resistances 10000 Ω, 8000 Ω and 4000 Ω respectively. The best voltmeter among these is the one whose resistance is

A
10000 Ω

B
8000 Ω

C
4000 Ω

D
All are equally good
Question 9
4 / -1

A voltmeter essentially consists of

A
A high resistance, in series with a galvanometer

B
A low resistance, in series with a galvanometer

C
A high resistance in parallel with a galvanometer

D
A low resistance in parallel with a galvanometer
Question 10
4 / -1

A 100 ohm galvanometer gives full scale deflection at 10 mA. How much shunt is required to read 100 mA?

A
11.11 ohm

B
9.9 ohm

C
1.1 ohm

D
4.4 ohm

Solution