Ohm’s Law (Electrical Resistance - V-I Characteristics of Ohmic and Non-Ohmic Conductors) NEET Questions

Physics - Current Electricity

Ohm’s Law (Electrical Resistance - V-I Characteristics of Ohmic and Non-Ohmic Conductors) MCQ Questions


13.
Which of the following is an example of a non-ohmic device?
A.
Carbon resistor
B.
Manganin wire
C.
Diode
D.
Copper wire
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ANSWER :
C. Diode
14.
The unit of resistivity is:
A.
Ω
B.
Ω·m
C.
Ω/m
D.
Ω·m²
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ANSWER :
B. Ω·m
15.
When the temperature of a metallic conductor increases, its resistance:
A.
Decreases
B.
Remains constant
C.
First decreases then increases
D.
Increases
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ANSWER :
D. Increases
16.
The resistance of a semiconductor with rise in temperature:
A.
Remains constant
B.
Increases
C.
Decreases
D.
Becomes infinite
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ANSWER :
C. Decreases
17.
A conductor obeys Ohm's law if:
A.
V/I is constant for all values of V
B.
Its resistance changes with current
C.
Its V-I graph is non-linear
D.
Its V-I curve depends on direction of V
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ANSWER :
A. V/I is constant for all values of V
18.
A potential difference of 12 V is applied to a conductor of resistance 4 Ω. The current flowing through it is:
A.
16 A
B.
0.33 A
C.
3 A
D.
48 A
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ANSWER :
C. 3 A