Current Electricity Test

Result

Current Electricity Test - 60

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Weekly Quiz Competition

Question 1
4 / -1

The resistivity of a potentiometer wire is 40 × 10^–8 ohm 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 2
4 / -1

Potentiometer wire of length 1 m is connected in series with 490 Ω resistance and 2 V battery. If 0.2 mV /cm is the potential gradient, then resistance of the potentiometer wire is

A
4.9 Ω

B
7.9 Ω

C
5.9 Ω

D
6.9 Ω

Solution
Question 3
4 / -1

The resistance of an ideal voltmeter is

A
Zero

B
Very low

C
Very large

D
Infinite
Question 4
4 / -1

A 100 V voltmeter of internal resistance 20 kΩ in series with a high resistance R is connected to a 110 V line. The voltmeter reads 5 V, the value of R is

A
210 KΩ

B
315 KΩ

C
420 KΩ

D
440 KΩ

Solution
Question 5
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
Question 6
4 / -1

The net resistance of a voltmeter should be large to ensure that

A
It does not get overheated

B
It does not draw excessive current

C
It can measure large potential difference

D
It does not appreciably change the potential difference to be measured
Question 7
4 / -1

In the circuit shown P ≠ R, the reading of the galvanometer is same with switch S open or closed. Then

A
I_R = I_G

B
I_P = I_G

C
I_Q = I_G

D
I_Q = I_R
Question 8
4 / -1

In the following Wheatstone bridge P/Q = R/S . If key K is closed, then the galvanometer will show deflection

A
In left side

B
In right side

C
No deflection

D
In either side
Question 9
4 / -1

If resistance of voltmeter is 10000 Ω and resistance of ammeter is 2 Ω, then find R when voltmeter reads 12V and ammeter reads 0.1 A

A
118 Ω

B
120 Ω

C
124 Ω

D
114 Ω

Solution
Question 10
4 / -1

Two resistances are connected in two gaps of a metre bridge. The balance point is 20 cm from the zero end. A resistance of 15 ohms is connected in series with the smaller of the two. The null point shifts to 40 cm. The value of the smaller resistance in ohms is

A
3

B
6

C
9

D
12

Solution