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Mdcat-past-papers Quiz

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41. When different resistors are connected across the terminal of a battery:



42. A soft cylindrical conducting wire has resistance R. It is stretched so its length is doubled but its radius remains constant. What is the new resistance?



43. The relative permittivity of air (1atm) is:



44. When length of copper wire is doubled then resistivity becomes:



45. The resistance of semiconductor with rise in temperature:



46. The unit of resistivity is:



47. The unit of conductivity is:



48. The resistance of pure metal increases with:



49. When two conductors each of resistance R are attached in series to external circuit, their net resistance is:



50. A conductor has resistance R. If its length is stretched to twice the actual value and its radius is reduced to one third of its original value, the new resistance will be:



51. The resistance of a conducting material depends upon:



52. Which of the following materials have negative temperature coefficient?



53. Temperature coefficient of resistance is defined as increase in resistance per ohm original resistance per:



54. For metals, the temperature coefficient of resistance is:



55. When a wire is compressed and its radius becomes 2R then its resistance will be:



56. The unit of resistivity is:



57. Effective resistance between A and B is:



58. Resistance of a conductor of a meter cube of substance is:



59. Resistance of a conductor depends upon:



60. If length of the wire becomes two times and area becomes half, then the resistance of the wire becomes:



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