Conductivity is the reciprocal of Resistivity Current density Resistance None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
The electrical energy required to heat a bucket of water to a certain temperature is 4 kWh. If the heat losses are 20 percent, the energy input is 5 kWh 2 kWh 3.2 kWh 6 kWh TRUE ANSWER : ? YOUR ANSWER : ?
When current flows through heater coil it glows but supply wiring does not glow because Current through supply line flows at slower speed Supply wires are made of superior material Supply wiring is covered with insulation layer Resistance of heater coil is more than the supply wires TRUE ANSWER : ? YOUR ANSWER : ?
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains None of these Length of heating element has no effect on heating if water Length of heating element should be decreased Length of heating element should be increased TRUE ANSWER : ? YOUR ANSWER : ?
One Newton meter is same as One joule One watt Five joules One joule second TRUE ANSWER : ? YOUR ANSWER : ?
A wire having very high value of conductance is said to be Insulator Moderately good conductor None of the listed here Very good conductor TRUE ANSWER : ? YOUR ANSWER : ?
Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across Rl Either Rl or Ri None of them Ri TRUE ANSWER : ? YOUR ANSWER : ?
No current flow between two charged bodies if they have same Capacity None of the listed here Charge Potential TRUE ANSWER : ? YOUR ANSWER : ?
Ohm's law is not applicable to High voltage circuits Vaccum tubes Circuits with low current densities Carbon resistors TRUE ANSWER : ? YOUR ANSWER : ?
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals 10 W 40 W 20 W 60 W TRUE ANSWER : ? YOUR ANSWER : ?