A charge is moving across a junction, then
1. momentum will be conserved.
2.momentum will not be conserved.
3.at some places momenturii will be conserved and at some other places momentum will not be conserved.
4.none of these.
Posted Date:-2021-02-02 13:05:08
An electric heater is connected to the voltage supply. After few seconds, current gets its steady value then its initial current will be
1.equal to its steady current
2.slightly higher than its steady current
3.slightly less than its steady current
4. zero
Posted Date:-2021-02-02 13:05:08
 In the series combination of two or more than two resistances
1.the current through each resistance is same.
2.the voltage through each resistance is same.
3.neither current nor voltage through each re-sistance is same.
4.both current and voltage through each resis¬tance are same.
Posted Date:-2021-02-02 13:05:08
Combine three resistors 5 Q, 4.5 Q and 3 Q in such a way that the total resistance of this combination is maximum
1.12.5 Q
2.13.5 Q
3.14.5 Q
4.16.5 Q
Posted Date:-2021-02-02 13:05:08
In a potentiometer of 10 wires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should
1. decrease resistance in the main circuit.
2. increase resistance in the main circuit.
3.decrease resistance in series with the cell whose emf is to be measured.
4. increase resistance in series with the cell whose emf is to be determined.
Posted Date:-2021-02-02 13:05:08
In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will
1.change in previous direction
2.not change
3. change in opposite direction
4.none of these.
Posted Date:-2021-02-02 13:05:08
In parallel combination of n cells, we obtain
1. more voltage
2.more current
3. less voltage
4.less current
Posted Date:-2021-02-02 13:05:08
The resistivity of alloy manganin is
1.Nearly independent of temperature
2.Increases rapidly with increase in temperature
3.Decreases with increase in temperature
4. Increases rapidly with decrease in temperature
Posted Date:-2021-02-02 13:05:08
When a metal conductor connected to left gap of a meter bridge is heated, the balancing point
1.shifts towards right
2. shifts towards left
3.remains unchanged
4.remains at zero
Posted Date:-2021-02-02 13:05:08