Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - NEET MCQ

# Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - NEET MCQ

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Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 1

### V-I graph of which material shows the straight line

Detailed Solution for Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - 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 & Limitations of Ohm’s Law (December 2) - 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 & Limitations of Ohm’s Law (December 2) - 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

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Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 3

### 1 ohm is equal to

Detailed Solution for Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 3

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 & Limitations of Ohm’s Law (December 2) - Question 4

Which of the following is an ohmic conductor?

Detailed Solution for Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 4

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.

Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 5

Match the Column I with Column II.

Detailed Solution for Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 5

(A) → (p) if the temperature is not very high.
(B) → (r)
(C) → (q)

Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 6

Which of the following I - V graph represents ohmic conductors?

Detailed Solution for Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 6

Ohm’s law V = IR is an equation of straight line. Hence I - V characteristics for ohmic conductors is also a straight line and its slope gives resistance of the conductor.

Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 7

The I - V characteristics shown in figure represents

Detailed Solution for Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 7

The figure is showing I-V characteristics of non-ohmic or non-linear conductors.

Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 8

A charged particle having drift velocity of 7.5 × 10−4 m s−1 in electric field of 3×10−10 V m−1, mobility is?

Detailed Solution for Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 8

Mobility of charged particle

= 2.5 × 106m2V−1s−1

Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 9

Specific resistance of a conductor increases with

Detailed Solution for Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 9

Resistance of a conductor is given by R = ρ l/A,
where ρ is the specific resistance, l is the length and A is the cross-sectional area of the conductor.
Now, when l = 1 and A = 1, R = ρ. So specific resistance or resistivity of a material may be defined as the resistance of a specimen of the material having unit length and unit cross-section. Hence, specific resistance is a property of a material and it will increase with the increase of temperature, but will not vary with the dimensions (length, cross section) of the conductor.

Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 10

A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are

Detailed Solution for Test: Ohm’s law & Limitations of Ohm’s Law (December 2) - Question 10

Current does not depend on the area of the conductor; hence it remains a constant.
Current density is inversely a constant.
Current density is inversely proportional to area (i.e.,) J∝1/A​ electric field drift speed is also inversely proportional to area (i.e.,) E∝1/A​,Vd​∝1/A​
Hence current is constant along the conductor.

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