Electric Current Test

Result

Electric Current Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

V-I graph of which material shows the straight line

A
Silicon

B
Silver

C
Germanium

D
Gallium

Solution

Materials which obeys the ohm’s law show straight line in the V-I graph. Since silver is the only ohmic material in given options, it shows straight line curve.
Question 2
1 / -0

The following fig. shows I-V graph for a given metallic wire at two temperatures T₁and T₂.Then,

A
Temperature T₂ is less

B
Temperature T₂ is more

C
T₁ is same as T₂

D
None of the above

Solution

The slope of the graph = I / V
In case of T₂, I/V is less. Hence, V/I (=R) is more.
Value of resistance increases with increasing temperature.
Hence, T₂ >T
Question 3
1 / -0

How many electrons are flowing per second through a section of a conductor corresponding to current of 1A?

A
7. 00 × 10¹⁸

B
6.25 × 10¹⁸

C
3.25 × 10¹⁶

D
4.75 × 10¹⁷

Solution

I=Q/t
1 Ampere = 1 Coulomb /1 Secon
Charge on 1 electron = 1.6 x 10^-19
Coulomb
By unitary method,
If 1.6 x 10^-19 Coulomb / Second (Ampere) = Current by 1 electron
then, 1( Coulomb / Second) or (Ampere) = 1 / (1.6 x 10^-19) electrons
i.e, 6.25 x 10^18 electrons.
Question 4
1 / -0

1 ohm is equal to

A
1 volt per ampere

B
1 ampere per millivolt

C
1 milliampere per volt

D
1 ampere per volt

Solution

1 Ohm is defined as the resistance of a conductor with a potential difference of 1 volt applied to the ends through which 1-ampere current flows.
Ohms is the SI unit of electrical resistance.
Question 5
1 / -0

Which of the following is an ohmic conductor?

A
Transistors

B
Thermionic valves

C
Constanton

D
Electrolyte

Solution

Ohmic conductors are those which follows ohm's Law
Constantan is an copper nickle alloy which follows ohm's law
An electrolyte is a chemical that produces an electrically conducting solution and hence conducts electrical current.
But Electrolyte can be Ohmic as well as non-ohmic conductor
Transistor is semi-conductor device and does not follow ohm's Law
thermionic valves - is vacuum tube (electronic tube) , uses ion emission.
So option C Constanton s an ohmic conductor.