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Mdcat-past-papers Quiz

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61. The temperature coefficient of a semiconductor is negative because:



62. The resistance of a wire is 6Ω at 50°C and 8Ω at 100°C. The resistance at 0°C is:



63. A wire is stretched so that its radius becomes half. The resistance becomes:



64. The resistance of pure metal increases with:



65. If length becomes double and area becomes half, the resistance becomes:



66. Which graph explains non-ohmic material whose resistance decreases?



67. Equivalent resistance between points A and B is:



68. The substances having negative temperature coefficient are:



69. A 12V battery is applied across 6Ω resistance. To get 1A current through the same resistance, the required potential difference is:



70. A carbon resistor is connected to a 50V battery and passes 2A current. If voltage is increased to 75V, the current will be:



71. Energy consumed by a 60W bulb in 2 minutes is:



72. A potential difference is applied across a wire of length l and radius r, and current I flows. If another wire of same material with length 2l and radius 2r is used, then current will be:



73. A particle carrying charge 5e falls through a potential difference of 25V. Energy gained by particle is:



74. Calculate the rate of energy transfer when 220V mains supply gives 0.1A to a LED:



75. According to maximum power transfer theorem, the maximum power delivered by battery to output is:



76. The internal resistance of a battery is:



77. The electric potential across the terminals of a battery is called:



78. A heating coil has 10Ω resistance and operates on 20V. Power supplied in 10 seconds is:



79. The domestic electricity supply in Pakistan has a frequency of:



80. Ohm's law states that the current is directly proportional to ------- and inversely proportional to -------



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