InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In a potentiometer experiment it is found that no current passes through the galvanometer when the terminals of the cell are connected across `0.52 m` of the potentiometer wire. If the cell is shunted by a resistance of `5Omega` balance is obtained when the cell connected across` 0.4m` of the wire. Find the internal resistance of the cell. |
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Answer» Correct Answer - 1.5 `Omega` |
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| 2. |
A potentiometer , with a wire of length 10 m, is connected to an accululator of steady voltage. A lenchlanche cell gives a null point at 7.5 m If the length of the potentiometer wire is increaseed by 1 m, find the new posistion of the null point. |
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Answer» Correct Answer - 8.25 m |
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| 3. |
A metre bridge wire of resistance 3 `Omega` is connected to a cell of emf 2 V and internal rsistance 1 `Omega` Claculate the p.d cm of the wire What length of this wire will balace a fesh dry cell of emf 1.5 V? |
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Answer» Correct Answer - 0.015V//cm,full length of it |
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| 4. |
In a ten-wire potentiometer the first five wires are of radius r and the next five wires are of radius 2r.The wire is cnneceted to battery of steady voltage 2 V and negligible internal resistance What lenghts of this potentiometric arrangement will balacne the emf of (a) a dainell cell (emf=1.0 volt),(b) a Lenhlanche cell (emf=1.5 V) (c) an unknown cell of emf 1.8 V? |
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Answer» Correct Answer - (a) 312.5 cm,(b) 468.75 cm,(c) 750cm |
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| 5. |
A potentiometer having a wire of 4 m lengths is connected to the terminals of a battery with steady voltage. A leclanche cell has a null point at 1m. If the length of the potentiometer wire is increased by 1 m, the position of the null points is |
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Answer» Correct Answer - 1.25 m |
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| 6. |
A 10 wire potentiometer has a resistance of 10` Omega` and is connected to fan accumulator of 2 V and negligible internal resistance.There are two resistance boxes `R_(1)` and `R_(2)` in series with the accumulator and one can have any intergral values of resistance from resistance boxes . A standard-cell of 1.018 V with a sensitive galvanometer in series with it is connected across `R_(1)`.How would you proceed with the above arrangement to obtain potential drop of 1 `mu` V per mm of the potentiometer wire? Calculate the vlue3s of `R_(1)` and `R_(2)` requried. What length of this potentiometer will balance the thermo emf of and copper couple at `300^(@)C` which develops 17`muV//^(0)C?` |
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Answer» Correct Answer - Put `R_(1)` =1018 `Omega`(1000 times emf of Cd-cell),adust `R_(2)` till no deflection ocurs in the galvanometer , `R_(2)`=972 `Omega`;5.1 m |
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| 7. |
A five- wire potentiometer is connected to an accumulator emf 2.2 V and internal resistance 1 `Omega` The potentiometer wire has resistance of 1 `Omega` per metre. What is the maximum voltage that you can measure with this particular arrangement of the potentiometer? What length of this potentiometer will balance the emf of a Daniell cell(emf=1.18)? What resistance in series with the accumulatro will be required to balce this cell exactly at the centre of the last wire? |
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Answer» Correct Answer - 1.833 V, 3.218 m, 2.39 `Omega` |
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