Olete.in – MCQs, Mock Tests & Government Job Prep| CBES Board Class 12 CBES Board(Class 12-Physics)MCQ Questions with Answers(Chapter 3 Current Electricity)

1. An electric heater is connected to the voltage supply. After few seconds, current gets its steady value then its initial current will be
equal to its steady current
slightly higher than its steady current
slightly less than its steady current
zero

2. In the series combination of two or more than two resistances
the current through each resistance is same.
the voltage through each resistance is same.
neither current nor voltage through each re-sistance is same.
both current and voltage through each resis¬tance are same.

3. Combine three resistors 5 Q, 4.5 Q and 3 Q in such a way that the total resistance of this combination is maximum
12.5 Q
13.5 Q
14.5 Q
16.5 Q

4. In parallel combination of n cells, we obtain
more voltage
more current
less voltage
less current

5. In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will
change in previous direction
not change
change in opposite direction
none of these.

6. When a metal conductor connected to left gap of a meter bridge is heated, the balancing point
shifts towards right
shifts towards left
remains unchanged
remains at zero

7. 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
decrease resistance in the main circuit.
increase resistance in the main circuit.
decrease resistance in series with the cell whose emf is to be measured.
increase resistance in series with the cell whose emf is to be determined.

8. A charge is moving across a junction, then
momentum will be conserved.
momentum will not be conserved.
at some places momenturii will be conserved and at some other places momentum will not be conserved.
none of these.

9. The resistivity of alloy manganin is
Nearly independent of temperature
Increases rapidly with increase in temperature
Decreases with increase in temperature
Increases rapidly with decrease in temperature