Ohm's Law NDA Questions

NDA Physics

Ohm's Law MCQ Questions


13.
Which method can be used for absolute measurement of resistances?
A.
Ohm's law method
B.
Wheatstone bridge method
C.
Releigh method
D.
All of these
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ANSWER :
B. Wheatstone bridge method
14.
A wire of 0.14 mm diameter and specific resistance 9.6 micro ohm-cm is 440 cm long. The resistance of the wire will be
A.
9.6 ohm
B.
11.3 ohm
C.
27.4 ohm
D.
None of the above
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ANSWER :
C. 27.4 ohm
15.
Ohm's law is not applicable to
A.
Semiconductors
B.
D.C. circuits
C.
Small resistors
D.
High currents
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ANSWER :
A. Semiconductors
16.
Low resistance can be accurately measured by
A.
Kelvin bridge
B.
Wheatstone bridge
C.
Wein's bridge
D.
None of the above
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ANSWER :
A. Kelvin bridge
17.
Ohm's law in point form in field theory can be expressed as
A.
V = RI
B.
J = E/σ
C.
J = σE
D.
R = ρl/A
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ANSWER :
C. J = σE
18.
Which of the following bulbs will have the least resistance?
A.
220V, 60W
B.
220V, 100W
C.
115V, 100W
D.
None of the above
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ANSWER :
C. 115V, 100W