Current electricity questions with answers
89 multiple-choice questions. Open any question for its answer and explanation.
- Out of the following which is an insulating material?
- In a lamp load when more than one lamp are switched on the total resistance of the load
- The ratio of mass of proton to that of electron is nearly
- Resistance of a tungsten lamp as applied voltage increases
- Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.
- The resistance of a copper wire 200 m long is 21 $$\Omega .$$ If its thickness (diameter) is 0.44 mm, its specific resistance is around
- Out of the following which is not a poor conductor?
- Which of the following can have negative temperature coefficient?
- In a circuit a 33 Ohm resistor carries a current of 2
- Which of the following statement is correct?
- All good conductors have high
- The S.I. unit of power is
- Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
- Heat in a conductor is produced on the passage of electric current due to
- A 3 ohm resistor having 2 A current will dissipate the power of
- Which of the following statement is true?
- Temperature coefficient of resistance is expressed in terms of
- Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
- A substance whose molecules consist of dissimilar atoms is called
- Two resistors are said to be connected in series when
- The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true?
- Which of the following statement is true both for a series and a parallel D.C. circuit?
- Sparking occurs when a load is switched off because the circuit has high
- One Newton meter is same as
- When current flows through heater coil it glows but supply wiring does not glow because