MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A battery of emf 10V has an internal resistance of 1 ohms and is charged by a 150V dc supply using a series resistance of 19 ohms. What is the terminal voltage of the battery? |
| A. | 15V |
| B. | 20V |
| C. | 17V |
| D. | 25V |
| Answer» D. 25V | |
| 2. |
When cells are connected incorrectly in series, total internal resistance is also affected. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
n cells have emf e and internal resistance r and connected to an external resistance R . They pass the same current whether the cells are connected in series or in parallel to each other. Then which of the following conditions are true? |
| A. | R = r |
| B. | r = nR |
| C. | R = nr |
| D. | R = n<sup>2</sup>r |
| Answer» B. r = nR | |
| 4. |
36 cells, each of emf 4V are connected in series and kept in a box. The combination shows an emf of 88V on the outside. Calculate the number of cells reversed. |
| A. | 2 |
| B. | 5 |
| C. | 10 |
| D. | 7 |
| Answer» E. | |
| 5. |
There are 4 resistors, each having the same resistance of 4 ohms. These are first connected in series with a cell of internal resistance 2 ohms. Then, they are connected in parallel to the same cell. Find the ratio of the respective currents in the two cases. |
| A. | 1:8 |
| B. | 1:7 |
| C. | 1:6 |
| D. | 6:1 |
| Answer» D. 6:1 | |
| 6. |
In parallel grouping of cells, we obtain more current. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Calculate the number of dry cells, each of emf 2V and internal resistance 1V that is joined in series with a resistance of 30 ohms so that a current of 0.8A passes through it. |
| A. | 20 |
| B. | 10 |
| C. | 30 |
| D. | 40 |
| Answer» B. 10 | |
| 8. |
Which of the following is correct when one cell is wrongly connected in series circuit? |
| A. | The total emf reduces by e |
| B. | The total emf increases by e |
| C. | The total emf increases by 2e |
| D. | The total emf decreases by 2e |
| Answer» D. The total emf decreases by 2e | |
| 9. |
What will be the grouping of cells when the current in the circuit is ( frac {ne}{(R + nr)} )? |
| A. | Parallel grouping |
| B. | Series grouping |
| C. | Mixed grouping |
| D. | When there is no grouping |
| Answer» C. Mixed grouping | |