74. Sparking occurs when a load is switched off because the circuit has high_________?
74. Sparking occurs when a load is switched off because the circuit has high_________?
A. resistance
B. inductance
C. capacitance
D. impedance
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Out of the following which is an insulating material____________?
Out of the following which is an insulating material____________?
A. Copper
B. Gold
C. Silver
D. PaperInsulating materials have the function of______________?
Insulating materials have the function of______________?A. preventing a short circuit between conducting wires
B. preventing an open circuit between the voltage source and the load
C. conducting very large currents
D. storing very high currentsThe resistance of a conductor varies inversely as___________?
The resistance of a conductor varies inversely as___________?
A. length
B. area of cross-section
C. temperature
D. resistivityAn electric filament bulb can be worked from____________?
An electric filament bulb can be worked from____________?
A. D. C. supply only
B. A. C. supply only
C. Battery supply only
D. All aboveVoltage dependent resistors are usually made from________________?
Voltage dependent resistors are usually made from________________?A. Charcoal
B. Silicon Carbide
C. Nichrome
D. GraphiteThe resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be
The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be
A. R Ω
B. 2R Ω
C. 4R Ω
D. 8R ΩAs per law of resistance, the resistance of the conductor is inversely proportional to its cross-sectional area i.e. it is inversely proportional to the square of the diameter of cross-sectional area of the conductor. As per same law of resistance, the resistance of the conductor is directly proportional to the length of the conductor.