- 1(current)
Q. No.The terminal potential difference of a cell is greater than its emf when:
| 1. | A battery of less emf is connected in its series. |
| 2. | A battery of higher emf is connected in its series. |
| 3. | A battery of higher emf is connected in its parallel. |
| 4. | A battery of less emf is connected in its parallel. |
A car battery of emf \(12~\text{V}\) and internal resistance \(5\times 10^{-2}~\Omega\) receives a current of \(60~\text{A}\) from an external source. The terminal voltage of the battery is:
| 1. | \(12~\text{V}\) | 2. | \(9~\text{V}\) |
| 3. | \(15~\text{V}\) | 4. | \(20~\text{V}\) |
For a cell, the terminal potential difference is \(2.2\) V when the circuit is open and reduces to \(1.8\) V when the cell is connected to the resistance of \(R = 5~\Omega\). The internal resistance of cell (\(r\)) is:
| 1. | \(\dfrac{10}{9}~ \Omega\) | 2. | \(\dfrac{9}{10}~ \Omega\) |
| 3. | \(\dfrac{11}{9}~ \Omega\) | 4. | \(\dfrac{5}{9}~ \Omega\) |
A battery is charged at a potential of \(15\) V for \(8\) hours when the current flowing is \(10\) A. The battery on discharge supplies a current of \(5\) A for \(15\) hours. The mean terminal voltage during discharges is \(14\) V. The "Watt hour" efficiency of the battery is:
1. \(80\%\)
2. \(90\%\)
3. \(87.5\%\)
4. \(82.5\%\)
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Q. No.
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