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.
A wire of resistance R is stretched to twice its original length. What will be its new resistance?
A.
R
B.
4R
C.
R/2
D.
R/4
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ANSWER :
B. 4R
8.
Which physical quantity remains constant in Ohm’s law for a given conductor?
A.
Temperature
B.
Current
C.
Voltage
D.
Resistance
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ANSWER :
A. Temperature
9.
What happens to the current if the voltage is doubled and resistance remains the same?
A.
Doubles
B.
Halves
C.
Remains the same
D.
Becomes zero
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ANSWER :
A. Doubles
10.
Which of the following materials is a good conductor of electricity?
A.
Glass
B.
Silver
C.
Plastic
D.
Rubber
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ANSWER :
B. Silver
11.
What happens to the resistance of a wire when its temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the material
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ANSWER :
A. Increases
12.
A copper wire and an iron wire of the same dimensions are taken. Which will have lower resistance?
A.
Copper
B.
Iron
C.
Both have same resistance
D.
None of these
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ANSWER :
A. Copper