A. Copper
B. Gold
C. Carbon
D. Silver
Q. No.2: The resistance of 200 m. long circular copper wire is 21Ω.If its thickness is 0.44mm,What is the resistivity(ohm-m) of the copper is-
A. 1.597*10-8
B. 2.507*10-8
C. 5.597*10-6
D. None of these
Q. No.3: Metals have temperature coefficient of resistance
A. Positive
B. Negative
C. May be positive or Negative
D. None of these
Q. No.4: The resistance of two wires is 25Ω when connected in series and 6Ω when connected in parallel. The resistance of each wire is-
A. 12 &13Ω
B. 15&10Ω
C. 20& 5 Ω
D. 24&1Ω
Q. No.5: A current of 3A flows through 10Ω resistor. The energy dissipated in 5 seconds is
A. 450J
B. 150J
C. 250J
D. None of these
Q. No.6: Ideal current source has its internal resistance equal to
A.1Ω.
B.2Ω.
C. 0Ω
D. Infinite
Q. No.7: If resistance of all three branches of star connected load is 1Ω each, then the resistance of each branch of equivalent delta load would be-
A. 3Ω
B. 9Ω
C. 0.3Ω
D. 1/3Ω
Q. No.8: A P.D of 300V is maintained across the terminals of the capacitor. The electric field strength (kV/m) between the plate gaps of (0.3mm) is-
A. 1000
B. 2000
C. 3000
D. 4000
Q. No.9: An 8micro-farad capacitor is connected in series with 0.5MΩ resistor. The time constant of the RC circuit is
A. 16 sec
B. 6 sec
C. 5 sec
D. 4 sec
Q. No.10: An 8 micro-farad capacitor is charged from a 100V supply. The energy stored in the capacitor is-
A. 0.004J
B. 0.0016J
C. 0.008 J
D. None of these
Answers to the above questions-
Answer 1 – C
Answer 2 – A
Answer 3 – D
Answer 4 – B
Answer 5 – A
Answer 6 – D
Answer 7 – A
Answer 8 – D
Answer 9 – D
Answer 10 – D
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