Electric Current Test

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Electric Current Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

A wire of resistance 3.0Ω is stretched to twice its original length. The resistance of the new wire will be

A
1.5 Ω

B
3.0

C
6.0

D
12
Question 2
1 / -0

A wire of resistance 4 is bent into a circle. The resistance between the ends of a diameter of the circle is

A
4

B
1

C
1/4

D
1/16
Question 3
1 / -0

The range of a voltmeter is 5V and its resistance is 5000 (49000 connected in series with a coil of resistance 100). What additional resistance should be connected in series with it so that its range is doubled?

A
5000 

B
4500 

C
4000 

D
3500 
Question 4
1 / -0

A galvanometer of resistance 10 gives full-scale deflection when 1mA current passes through it. The resistance required to convert it into a voltmeter reading up to 2.5 V is

A
24.9

B
249

C
2490

D
24900
Question 5
1 / -0

Which of the following statement is correct?

A
Electrons drifting in a conductor under the influence of an electric field are accelerated by the field.

B
The drift speed of the electrons in a conductor is of the order of a few mms^–1.

C
All free electrons ina metal drift from a lower to a higher potential.

D
Since the drift speed of electrons in metal is very small and the charge on an electron is extremely small, only a small amount of current can flow in metals.
Question 6
1 / -0

The deflection in a moving coil galvanometer falls from 50 to 10 divisions when a shunt of 12 is connected across it. The resistance of the galvanometer coil is

A
24

B
36

C
48

D
60