| 1. | What is the suitable material for electric fuse ? | |
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Nichrome
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Constantan
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Cu
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Tin-lead alloy
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Report Question| 2. | A cell of internal resistance r is connected to an external resistance R. The current will be maximum in R, if ? | |
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R = r
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R > r
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R = r/2
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R < r
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| 3. | A charge is moving across a junction, then ? | |
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momentum will not be conserved.
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at some places momentum will be conserved and at some other places momentum will not be conserved.
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momentum will be conserved.
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none of these.
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| 4. | For measurement of potential difference, a potentiometer is preferred over voltmeter because ? | |
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potentiometer is cheaper than voltmeter.
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potentiometer does not take current from the circuit.
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the resistance of potentiometer is less than voltmeter.
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potentiometer is more sensitive than voltmeter.
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| 5. | When a metal conductor connected to left gap of a meter bridge is heated, the balancing point ? | |
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remains at zero
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remains unchanged
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shifts towards right
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shifts towards left
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| 6. | A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it ? | |
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decreases, thermal velocity of the electron decreases
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increases, thermal velocity of the electron decreases
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decreases, thermal velocity of the electron increases
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increases, thermal velocity of the electron increases
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| 7. | At temperature 0K, the germanium behaves as a / an ? | |
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insulator
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super-conductor
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conductor
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ferromagnetic
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| 8. | Appliances based on heating effect of current work on ? | |
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only d.c.
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only a.c.
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both a.c. and d.c.
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None of these
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| 9. | In a wheatstone bridge in the battery and galvanometer are interchanged then the deflection in galvanometer will ? | |
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not change
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change in previous direction
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change in opposite direction
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none of these.
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| 10. | The resistivity of alloy manganin is ? | |
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Decreases with increase in temperature
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Increases rapidly with decrease in temperature
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Nearly independent of temperature
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Increases rapidly with increase in temperature
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