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question_answer1) In a copper voltameter, mass deposited in 30 second is m gm. If the time-current graph is as shown in figure, ECE of copper is
question_answer2) Which of the following plots may represent the thermal energy produced in a resistor in a given time as a function of the electric current [MP PMT 1999]
question_answer3) Two different metals are joined end to end. One end is kept at constant temperature and the other end is heated to a very high temperature. The graph depicting the thermo e.m.f. is [DCE 2000]
question_answer4) Which of the following graphs shows the variation of thermoelectric power with temperature difference between hot and cold junction in thermocouples
question_answer5) When an electric heater is switched on, the current flowing through it (i) is plotted against time (t). Taking into account the variation of resistance with temperature, which of the following best represents the resulting curve
question_answer6) The V-i graphs A and B drawn for two voltameters. Identify each graph
question_answer7) A constant current i is passed through a resistor. Taking the temperature coefficient of resistance into account, indicate which of the plots shown in figure best represents the rate of production of thermal energy in the resistor
question_answer8) In a copper voltameter, mass deposited in 6 minutes is m gram. If the current-time graph for the voltameter is as shown here, then the E.C.E of the copper is
question_answer9) Battery shown in figure has e.m.f. E and internal resistance r. Current in the circuit can be varied by sliding the contact J. If at any instant current flowing through the circuit is I, potential difference between terminals of the cell is V, thermal power generated in the cell is equal to h fraction of total electrical power generated in it.; then which of the following graph is correct
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