Current Electricity | Case Study-01 All the best! 1. The terminal potential difference of two electrodes of a cell is equal to emf of the cell when- I = 0 I ≠ 0 Both of these None of these None 2. A cell of emf E and internal resistance r gives a current of 0.5 A with an external resistance of 12 Ω and a current of 0.25 A with an external resistance of 25 Ω. What is the value of internal resistance of the cell? 5 Ω 1 Ω 7 Ω 3 Ω None 3. Choose the wrong statement. Potential difference across the terminals of a cell in a closed circuit is always less than its emf Internal resistance of a cell decrease with the decrease in temperature of the electrolyte Potential difference versus current graph for a cell is a straight line with a negative slope Terminal potential difference of the cell when it is being charged is given as V = E + Ir None 4. An external resistance R is connected to a cell of internal resistance r, the maximum current flows in the external resistance when- R = r R < r R > r R = 1/r None 5. If external resistance connected to a cell has been increased to 5 times, the potential difference across the terminals of the cell increases from 10 V to 30 V. The, the emf of the cell is- 30 V 60 V 50 V 40 V None 1 out of 5 Time's up
