51. Which of the following substances has the highest resistivity?
52. The resistance of an ideal voltmeter is
53. X-rays are . . . . . . . . waves.
54. A current of 0.8 A is drawn by a filament of on electric bulb for 3 minutes. Amount of electric change that flows through the circuit is . . . . . . . .
55. Electromagnet is constructed with which of the following?
56. A current of 5A is taken by a filament for 10 minutes. Find the amount of electric charge flowing through the circuit.
57. A rectangular coil of copper wire is rotating in a magnetic field. The direction of the induced current changes once in each?
58. Assertion (A): Light Emitting Diode (LED) lamps offer longer service life as compared to Compact Fluorescent Lamps (CFL).
Reason (R): Light Emitting Diodes (LED) lamps are more energy efficient as compared to the Compact Fluorescent Lamps (CFL).
Select the correct answer:
Reason (R): Light Emitting Diodes (LED) lamps are more energy efficient as compared to the Compact Fluorescent Lamps (CFL).
Select the correct answer:
59. Electric current is equals to
60. Which is the gas inside an electric bulb?
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