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Test: Ohm’s Law


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5 Questions MCQ Test Physics For JEE | Test: Ohm’s Law

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Test: Ohm’s Law - Question 1

V-I graph of which material shows the straight line

Detailed Solution for Test: Ohm’s Law - Question 1

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.

Test: Ohm’s Law - Question 2

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

Detailed Solution for Test: Ohm’s Law - Question 2

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

Test: Ohm’s Law - Question 3

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

Detailed Solution for Test: Ohm’s Law - Question 3

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.

Test: Ohm’s Law - Question 4

1 ohm is equal to

Detailed Solution for Test: Ohm’s Law - Question 4

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.
 

Test: Ohm’s Law - Question 5

Which of the following is an ohmic conductor?

Detailed Solution for Test: Ohm’s Law - Question 5

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.

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