15. In mesh analysis of a network, all the mesh currents must necessarily be either clock-wise or anticlock-wise
A.TRUE
B.False
C.Both
D.none

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16. Which of the following stays the same in all parts of a series circuit?
A. voltage
B. power
C. resistance
D. current

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17. The resistance of the windings of a generator is known as
A. generated resistance
B. field resistance
C. internal resistance
D. terminal resistance

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18. When resistance is added to a circuit having a constant potential, the current is
A. reduced in the same proportion
B. increased in the same proportion
C. unaltered
D. made fluctuating

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19. Ampere is the current which, if main tamed in two straight parallel conductors of infinite length, of neglible circular cross-section, and placed 1 m apart in a vacuum, would produce between these conductors a force of
A. 2 x 10-7 N/m length
B. 1 N/m length
C. 1 x 10-7 N/m length
D. 2 x 107 N/m length

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20. Ohm's law is applicable to
A. semi-conductors
B. vacuum tubes
C. electrolytes
D. none of these

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21. A wire of length / and of circular cross section of radius r has a resistance of Rohms. Another wire of same material and of cross-sectional radius 2r will have the same resistance R if the length is
A.21
B. ?
C.c) 4 I
D.12

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