The Resistance of a Given Wire Using Ohm's Law NEET Questions

Physics - Experimental Skills

The Resistance of a Given Wire Using Ohm's Law MCQ Questions


7.
The reciprocal of resistance is called:
A.
Conductivity
B.
Resistivity
C.
Conductance
D.
Reactance
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ANSWER :
C. Conductance
8.
Which of the following is an ohmic conductor?
A.
A semiconductor diode
B.
An electrolyte
C.
A metallic wire (copper, manganin) at constant temperature
D.
A vacuum tube diode
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ANSWER :
C. A metallic wire (copper, manganin) at constant temperature
9.
Which of the following does NOT obey Ohm's law?
A.
A semiconductor diode
B.
Manganin wire at constant temperature
C.
A copper wire at constant temperature
D.
Nichrome wire at constant temperature
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ANSWER :
A. A semiconductor diode
10.
Ohm's law is valid only when:
A.
Current is zero
B.
The wire is hot
C.
The physical conditions (especially temperature) remain unchanged
D.
Voltage is very high
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ANSWER :
C. The physical conditions (especially temperature) remain unchanged
11.
The resistance R of a uniform wire of length L, cross-sectional area A, and resistivity ρ is:
A.
R = ρ/(LA)
B.
R = ρA/L
C.
R = LA/ρ
D.
R = ρL/A
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ANSWER :
D. R = ρL/A
12.
Resistivity (ρ) of a material depends on:
A.
Current through it
B.
Voltage across it
C.
Length and cross-sectional area only
D.
Nature of the material and its temperature
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ANSWER :
D. Nature of the material and its temperature