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


13.
The SI unit of resistivity is:
A.
Metre/ohm
B.
Ohm/metre (Ω/m)
C.
Ohm-metre (Ω·m)
D.
Ohm
😑 View Answer Rough Work Error
ANSWER :
C. Ohm-metre (Ω·m)
14.
If the length of a wire is doubled while keeping the cross-section constant, its resistance:
A.
Becomes 4 times
B.
Stays the same
C.
Halves
D.
Doubles
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ANSWER :
D. Doubles
15.
If the radius of a wire is doubled while keeping the length constant, its resistance:
A.
Becomes one-fourth
B.
Doubles
C.
Stays the same
D.
Becomes four times
😑 View Answer Rough Work Error
ANSWER :
A. Becomes one-fourth
16.
If a wire of resistance R is stretched to double its length (volume conserved), its new resistance becomes:
A.
R/4
B.
4R
C.
R/2
D.
2R
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ANSWER :
B. 4R
17.
If a wire is stretched to n times its original length (volume conserved), the new resistance is:
A.
n × R
B.
R/n²
C.
R/n
D.
n² × R (original)
😑 View Answer Rough Work Error
ANSWER :
D. n² × R (original)
18.
Two wires of the same material have lengths in the ratio 1:2 and radii in the ratio 1:2. Their resistances are in the ratio:
A.
1:2
B.
4:1
C.
2:1
D.
1:4
😑 View Answer Rough Work Error
ANSWER :
C. 2:1