Which is the best conductor of electricity ?
Carbon
Silver
Iron
Copper
Silver
For which of the following ‘ampere second’ could be the unit ?
Charge
Reluctance
Power
Energy
Charge
All of the following are equivalent to watt except
amperes x volts
joules/sec.
(amperes) ohm
amperes/volt
amperes/volt
A resistance having rating 10 ohms 10 W is likely to be a
metallic resistor
carbon resistor
wire wound resistor
variable resistor
wire wound resistor
Which one of the following does not have negative temperature co-efficient ?
Aluminium
Mica
Rubber
Paper
Aluminium
Varistors are
non-linear resistors
carbon resistors
insulators
resistors with zero temperature coefficient
non-linear resistors
Insulating materials have the function of
storing very high currents
preventing an open circuit between the voltage source and the load
preventing a short circuit between conducting wires
conducting very large currents
preventing an open circuit between the voltage source and the load
Which of the following quantities remain the same in all parts of a series circuit ?
Current
Voltage
Power
Resistance
Current
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb the heater output will
heater will burn out
remain same
decrease
increase
increase
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes using same supply mains
length of heating element should be increased
length of heating element has no effect on heating if water
length of heating element should be decreased
none of the above
length of heating element should be decreased
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