Electrical Resistivity and Conductivity (Series and Parallel Combinations of Resistors; Temperature Dependence of Resistance) NEET Questions

Physics - Current Electricity

Electrical Resistivity and Conductivity (Series and Parallel Combinations of Resistors; Temperature Dependence of Resistance) MCQ Questions


7.
In a series combination of resistors, the equivalent resistance is:
A.
Sum of individual resistances
B.
Less than the smallest resistance
C.
Equal to the largest resistance
D.
Equal to the smallest resistance
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ANSWER :
A. Sum of individual resistances
8.
The temperature coefficient of resistance is positive for:
A.
Metals
B.
Semiconductors
C.
Insulators
D.
All of the above
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ANSWER :
A. Metals
9.
In a parallel combination of resistors, the equivalent resistance is:
A.
Less than the smallest resistor
B.
Greater than the largest resistor
C.
Equal to the largest resistor
D.
Equal to the smallest resistor
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ANSWER :
B. Greater than the largest resistor
10.
A wire of resistance R is stretched uniformly to double its length. The new resistivity of the wire is:

NEET - 2022

A.
Doubles
B.
Remains the same
C.
Becomes half
D.
Becomes four times
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ANSWER :
B. Remains the same
11.
Which physical property determines a material’s ability to conduct electricity?
A.
Density
B.
Mass
C.
Resistivity
D.
Temperature coefficient
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ANSWER :
D. Temperature coefficient
12.
With an increase in temperature, the resistance of a semiconductor:

NEET - 2023

A.
Increases
B.
Decreases
C.
Remains constant
D.
First increases, then decreases
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ANSWER :
B. Decreases