| 1. | When potential difference is applied across an electrolyte, then Ohm’s law is obeyed at ? | |
|
zero potential
|
||
|
high potential
|
||
|
negative potential
|
||
|
very low potential
|
||
View Answer
Discuss in Forum
Report Question| 2. | Question: Choose the correct option Assertion : A current flows in a conductor only when there is an electric field within the conductor. Reason : The drift velocity of electron in presence of electric field decreases. ? | |
|
Assertion is correct, reason is correct; reason is not a correct explanation for assertion
|
||
|
Assertion is correct, reason is correct; reason is a correct explanation for assertion.
|
||
|
Assertion is incorrect, reason is correct
|
||
|
Assertion is correct, reason is incorrect
|
||
| 3. | To get maximum current in a resistance of 3 ohms, one can use n rows of m cells (connected in series) connected in parallel. If the total number of cells is 24 and the internal resistance of a cell is 0.5 ohms then ? | |
|
m = 6, n = 4
|
||
|
m = 2, n = 12
|
||
|
m = 12, n = 2
|
||
|
m = 8, n = 3
|
||
| 4. | Which of the following statements is false ? | |
|
Wheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude
|
||
|
In a balanced wheat-stone bridge if the cell and the galvanometer are exchanged, the null point is disturbed.
|
||
|
A rheostat can be used as a potential divider
|
||
|
Kirchhoff's second law represents energy conservation
|
||
| 5. | In the series combination of two or more than two resistances ? | |
|
the voltage through each resistance is same
|
||
|
the current through each resistance is same
|
||
|
both current and voltage through each resistance are same
|
||
|
neither current nor voltage through each resistance is same
|
||
| 6. | In conductor when electrons move between two collisions, their paths are ........ when external fields are absent and ......... when external filed is present. ? | |
|
curved lines, curved lines
|
||
|
curved lines, straight lines
|
||
|
straight lines, straight lines
|
||
|
straight lines, curved lines
|
||
| 7. | Constantan wire is used for making standard resistance, because it has ? | |
|
high specific resistance
|
||
|
high melting point
|
||
|
low specific resistance
|
||
|
negligible temperature coefficient of resistance
|
||
| 8. | Which of the following is used for the formation of thermistor ? | |
|
Copper oxide
|
||
|
Iron oxide
|
||
|
Nickel oxide
|
||
|
All of the above
|
||
| 9. | With increase in temperature the conductivity of ? | |
|
in both metal and semiconductor decreases.
|
||
|
in both metals and semiconductors increases.
|
||
|
semi-conductors increases and metals decreases.
|
||
|
metals increases and of semiconductor decreases.
|
||
| 10. | Emf of a cell is ? | |
|
less than terminal potential difference of the cell.
|
||
|
the maximum potential difference between the terminals of a cell when no current is drawn from the cell.
|
||
|
the force required to push the electrons in the circuit.
|
||
|
the potential difference between the positive and negative terminal of a cell in a closed circuit.
|
||