Current Electricity Test

Result

Current Electricity Test - 36

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Weekly Quiz Competition

Question 1
4 / -1

A solenoid is at potential difference of 60 V and current flowing through it is 15 ampere, then the resistance of coil will be

A
4 Ω

B
8 Ω

C
0.25 Ω

D
2 Ω

Solution
Question 2
4 / -1

All of the following statements are true except

A
Conductance is the reciprocal of resistance and is measured in Siemen

B
Ohm's law is not applicable at very low and very high temperatures

C
Ohm's law is applicable to semiconductors

D
Ohm's law is not applicable to electron tubes, discharge tubes and electrolytes
Question 3
4 / -1

A potential difference of V is applied at the ends of a copper wire of length land diameter d. On doubling only d, drift velocity

A
Becomes two times

B
Becomes half

C
Does not change

D
Becomes one fourth

Solution
Question 4
4 / -1

If the resistance of a conductor is 5 Ω at 50°C and 7Ω at 100°C, then the mean temperature coefficient of resistance of the material is

A
0.008/°C

B
0.006/°C

C
0.004/°C

D
0.0011°C

Solution
Question 5
4 / -1

The resistance of a discharge tube is

A
Ohmic

B
Non-ohmic

C
Both (a) and (b)

D
Zero
Question 6
4 / -1

We are able to obtain fairly large currents in a conductor because

A
The electron drift speed is usually very large

B
The number density of free electrons is very high and this can compensate for the low values of the electron drift speed and the very small magnitude of the electron charge

C
The number density of free electrons as well as the electron drift speeds are very large and these compensate for the very small magnitude of the electron charge

D
The very small magnitude of the electron charge has to be divided by the still smaller product of the number density and drift speed to get the electric current
Question 7
4 / -1

In a wire of circular cross-section with radius r, free electrons travel with a drift velocity V when a current Iflows through the wire. What is the current in another wire of half the radius and of the same material when the drift velocity is 2V ?

A
2I

B
I

C
I/2

D
I/4

Solution
Question 8
4 / -1

The resistivity of a wire depends on its

A
Length

B
Area of cross-section

C
Shape

D
Material
Question 9
4 / -1

The conductivity of a superconductor is

A
Infinite

B
Very large

C
Very small

D
Zero

Solution
Question 10
4 / -1

In a neon discharge tube 2.9 × 10¹⁸ Ne⁺ ions move to the right each second while 1.2 × 10¹⁸, electrons move to the left per second. Electron charge is 1.6 × 10^–19C.
The current in the discharge tube

A
1 A towards right

B
0.66 A towards right

C
0.66 A towards left

D
Zero

Solution