Quiz  /  Current Electricity Class 12 MCQ Questions With Answers

  • 1. 
    Electric current that flows in only one direction.

  • Voltage
  • Direct Current
  • Alternating Current
  • Series Circuit

  • 2. 
    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.

  • 3. 
    Kirchhoff's junction rule is a reflection of

  • Conservation of current density vector
  • Conservation of charge and no accumulation of charge at the the junction
  • the momentum with which a charged particle approaches a junction is unchanged as the charged particle leaves the junction
  • Conservation of energy

  • 4. 
    A material in which electrons are not able to move easily

  • Circuit
  • Insulator
  • Resistance
  • Conductor

  • 5. 
    In a meter bridge, the point D is a neutral point (figure

  • (a) The meter bridge can have other neutral point for this set of resistances.
  • (b) When the jockey contacts a point on meter wire left of D, current flows to B from the wire.
  • (c) When the jockey contacts a point on the meter wire to the right of D, current flows from B to the wire through galvanometer.
  • (d) When R is increased, the neutral point shifts to left.

  • 6. 
    N 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.

  • 7. 
    What is the power of a 3V light bulb with 20 A running through it?

  • 0.15W
  • 6W
  • 60W
  • 6.67W

  • 8. 
    ------ is called the increase in resistance per unit original resistance per degree kelvin rise of temperature

  • Thermal velocity
  • temperature coefficient of electrical resistivity
  • temperature coefficient of electrical resistance
  • conducance

  • 9. 
    Drift velocity vd varies with the intensity of electric field as per the relation

  • (vd āˆ E
  • vd āˆ 1/E
  • vd = constant
  • vd āˆ EĀ²

  • 10. 
    15. From the graph between current I and voltage V shown below, identify the portion corresponding to negative resistance

  • (a) AB
  • (b) BC
  • (c) CD
  • (d) DE

  • 11. 
    Which of the following characteristics of electrons determines the current in a conductor?

  • Drift velocity alone
  • Thermal velocity alone
  • Both A and B
  • Neither A nor B

  • 12. 
    The figure below shows currents in a part of electric circuit. The current i is ________ .

  • 2 A
  • 1.3 A
  • 1.7 A
  • 1 A

  • 13. 
    In parallel combination of n cells, we obtain

  • more voltage
  • more current
  • less voltage
  • less current

  • 14. 
    Which of the following I-V graph represents ohmic conductors?

  • A
  • B
  • C
  • D

  • 15. 
    For measurement of potential difference, a potentiometer is preferred over voltmeter because

  • potentiometer is more sensitive than voltmeter.
  • the resistance of potentiometer is less than voltmeter.
  • potentiometer is cheaper than voltmeter.
  • potentiometer does not take current from the circuit.

  • 16. 
    A closed path that electric current follows

  • Voltage
  • Current
  • Resistance
  • Circuit

  • 17. 
    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
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