Which of the following statements is false? Mark as favorite Copy Link 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 Check Answer
In the series combination of two or more than two resistances? Mark as favorite Copy Link 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 Check Answer
In conductor when electrons move between two collisions, their paths are …….. when external fields are absent and ……… when external filed is present.? Mark as favorite Copy Link curved lines, curved lines curved lines, straight lines straight lines, straight lines straight lines, curved lines Check Answer
Constantan wire is used for making standard resistance, because it has? Mark as favorite Copy Link high specific resistance high melting point low specific resistance negligible temperature coefficient of resistance Check Answer
An energy source will supply a constant current into the load if its internal resistance is? Mark as favorite Copy Link zero non-zero but less than the resistance of the load equal to the resistance of the load very large as compared to the load resistance Check Answer
Which of the following is used for the formation of thermistor? Mark as favorite Copy Link Copper oxide Iron oxide Nickel oxide All of the above Check Answer
A current passes through a wire of non-uniform cross-section. Which of the following quantities are independent of the cross-section? Mark as favorite Copy Link Current density Drift velocity Free-electron density The charge crossing Check Answer
With increase in temperature the conductivity of? Mark as favorite Copy Link in both metal and semiconductor decreases. in both metals and semiconductors increases. semi-conductors increases and metals decreases. metals increases and of semiconductor decreases. Check Answer
A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of? Mark as favorite Copy Link each of these decreases each of these increases copper strip decreases and that of germanium increases copper strip increases and that of germanium decreases Check Answer
Emf of a cell is? Mark as favorite Copy Link 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. Check Answer