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ECAT Physics Current Electricity Mcq Questions

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1. The current through a metallic conductor is due to the motion of




2. Resistance of a conductor depends upon




3. A wire having very high value of conductance is said to be




4. A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part




5. Production of heat due to an electric current flowing through a conductor is given by




6. When same current passes for same time through a thick and thin wire




7. Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f?A. B. 90WC. 100W D. 120W




8. One kilowatt hour is the amount of energy delivered during




9. Thermocouples convert




10. Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains?




11. How much heat does a 40 W bulb generates in one hour?




12. An immersion heater of 400 watts kept on for 5 hours will consume electrical power of




13. Resistance of a super conductor is




14. Resistance of an ideal insulator is




15. Which one is the best material for making connecting wires?




16. Reciprocal of resistivity is called




17. When 2? 4? and 6? resistor are connected in parallel their resultant equivalent resistance will be




18. Circuit which gives continuously varying potential is called




19. Internal resistance is the resistance offered by




20. There are three bulbs of 60W 100W and 200W which bulb has thickest filament.




21. The current in the circuit shown in figure - What will be the current in the circuit?




22. Resistance between points A and B in the circuit shown in figure is




23. A neon flashlight cell with an emf of 1.5V gives a current of 15A when connected directly to an ammeter of resistance 0.04?. Internal resistance of the cell is




24. Resistance of a wire on increasing its temperature will




25. Specific resistance of a wire




26. An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be




27. In the following figure the terminal potential is




28. In liquids and gases the current is due to the motion




29. If 1 ampere current flows through 2m long conductor the charge flow through it in 1 hour will be




30. The graphical representation of Ohms law is




31. Which one of the following materials is useful for making bulb filaments?




32. The resistance of a conductor at absolute zero (OK) is




33. Why should a resistance be introduced in a circuit in series deliberately?




34. Electrical energy is measured in




35. All electrical appliances are connected in parallel to each other between the main line and neutral wire to get




36. Electrical energy is converted to heat at the rate of




37. Which one of the following bulbs has the least resistance?




38. A fuse is placed in series with the cireuit to protect against




39. Terminal potential difference of a battery is greater than its emf when