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MCAT Physics Mcq Questions Alterting current

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




2. Resistance of a super conductor is




3. Resistance of an ideal insulator is




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




5. Reciprocal of resistivity is called




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




7. Circuit which gives continuously varying potential is called




8. Internal resistance is the resistance offered by




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




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




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




13. 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




14. Resistance of a wire on increasing its temperature will




15. Specific resistance of a wire




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




17. In the following figure, the terminal potential is




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




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




20. The graphical representation of Ohms law is




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




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




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




24. Electrical energy is measured in




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




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




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




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




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




30. An alternating current or voltage




31. A changing magnetic flux produces around itself an induced




32. Electromagnetic waves travel in free space with the speed of




33. The direction of propagation of an electromagnetic waves is




34. An electromagnetic wave consists of




35. Electromagnetic waves transport




36. Waves emitted from the antenna are




37. Electromagnetic waves emitted from antenna are




38. If capacitance of L-C circuit is made four times then frequency of the circuit become




39. A capacitor of capacitance 30?F is charged by a constant current of 10mA. If initially the capacitor was uncharged what is the time taken for the potential difference across the capacitor to reach 300V?




40. The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is




41. To find the r.m.s value of an alternating current mathematically we need to have




42. An alternating current of r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing 10? resistor. The peak current is then




43. An alternating current is represented by the equation I = I?sin?t which of the following equation represents an alternating current of frequency and amplitude twice that of the above current?




44. pure resistor circuit the voltage and current are




45. In capacitive circuit the current




46. A 100?F capacitor with 12V source in series having frequency 50Hz will offer a capacitive reactance of about




47. If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb




48. A pure variable resistor is connected in series with a pure capacitor of fixed capacitance. The impedance of the circuit




49. A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is




50. Ammeter connected in an AC circuit measures