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#1. When electric current passes through a metallic conductor, its temperature rises. This is due to
#2. An instrument which detects electric current is known as
#3. The thickness of insulation provided on the conductor depends on
#4. An open resistor, when checked with an ohm-meter reads
#5. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes
#6. The substances which have a large number of free electrons and offer a low resistance are called
#7. Out of the following which is an insulating material ?
#8. A resistance having rating 10 ohms, 10 W is likely to be a
#9. All of the following are equivalent to watt except
#10. When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is
#11. Two resistors are said to be connected in series when
#12. A thermistor has
#13. When one leg of parallel circuit is opened out the total current will
#14. For testing appliances, the wattage of test lamp should be
#15. Which one of the following does not have negative temperature co-efficient ?
#16. Electric current passing through the circuit produces
#17. A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will
#18. With rise in temperature the resistance of semi-conductors
#19. In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains
#20. Which method can be used for absolute measurement of resistances ?
#21. Sparking occurs when a load is switched off because the circuit has high
#22. The resistance of a few meters of wire conductor in closed electrical circuit is
#23. Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller crosssectional area has a resistance of 40 ohms the resistance of other conductor will be
#24. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ?
#25. In a lamp load when more than one lamp are switched on the total resistance of the load
#26. A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be
#27. Ohm’s law is not applicable to
#28. The minimum charge on an ion is
#29. Electric pressure is also called
#30. In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is
#31. The resistance of a conductor varies inversely as
#32. Switching of a lamp in house produces noise in the radio. This is because switching operation produces
#33. When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power
#34. 1 angstrom is equal to
#35. Resistance of carbon filament lamp as the applied voltage increases.
#36. Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as
#37. The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is
#38. Which of the following materials has the least resistivity ?
#39. The number of electrons in the outer most orbit of carbon atom is
#40. Which of the following statement is true both for a series and a parallel D.C. circuit?
#41. In the case of direct current
#42. One newton meter is same as
#43. You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect
#44. Voltage dependent resistors are used
#45. The filament of an electric bulb is made of
#46. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is
#47. Bulbs in street lighting are all connected in
#48. Conductance : mho ::
#49. An electric filament bulb can be worked from
#50. Out of the following which is not a poor conductor ?
#51. In a series circuit with unequal resistances
#52. Varistors are
#53. Which of the following materials has a negative temperature co-efficient of resistance?
#54. The condition for the validity under Ohm’s law is that
#55. Which of the following statement is true?
#56. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ?
#57. If a parallel circuit is opened in the main line, the current
#58. If the efficiency of a machine is to be high, what should be low ?
#59. The insulation on a current carrying conductor is provided
#60. Resistance of a material always decreases if
#61. Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current
#62. Resistance of 220 V, 100 W lamp will be
#63. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true ?
#64. With rise in temperature the resistance of pure metals
#65. A substance whose molecules consist of dissimilar atoms is called
#66. Temperature co-efficient of resistance is expressed in terms of
#67. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals
#68. Conductance is reciprocal of
#69. Which of the following statement is correct ?
#70. If/, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to
#71. What will be energy used by the battery if the battery has to drive 6.28 x 1018 electrons with potential difference of 20 V across the terminal ?
#72. A closed switch has a resistance of
#73. A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is
#74. Resistance of a tungsten lamp as applied voltage increases
#75. The ratio of mass of proton to that of electron is nearly
#76. A field of force can exist only between
#77. A glass rod when rubbed with silk cloth is charged because
#78. Heat in a conductor is produced on the passage of electric current due to
#79. A 3 Q resistor having 2 A current will dissipate the power of
#80. When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is
#81. The thickness of insulation provided on the conductor depends on
#82. For which of the following ‘ampere second’ could be the unit ?
#83. Voltage dependent resistors are usually made from
#84. It becomes more difficult to remove
#85. are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
#86. The S.I. unit of Power
#87. The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is
#88. Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
#89. Current velocity through a copper conductor is
#90. All good conductors have high
#91. Which of the following quantities remain the same in all parts of a series circuit ?
#92. Two lamps 100 W and 40 W are connected in series across 230 V (alternating).Which of the following statement is correct ?
#93. Insulating materials have the function of
#94. The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around
#95. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Q. If the same four wires are connected is series the effective resistance will be
#96. Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across
#97. When current flows through heater coil it glows but supply wiring does not glow because
#98. Which is the best conductor of electricity
#99. Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is
#100. International ohm is defined in terms of the resistance of
#101. Ohm’s law is not applicable to
#102. Which of the following can have negative temperature coefficient ?
#103. Nichrome wire is an alloy of
#104. Which of the following material has nearly zero temperature co-efficient of resistance?
#105. The property of a conductor due to which it passes current is called
#106. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes
#107. The rating of a fuse wire is always expressed in
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