MCQs on Electrostatic Potential & Capacitance -ch 2 Class 12

March 7, 2021
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MCQs on Electrostatic Potential & Capacitance – Chapter 2 – Class 12 CBSE

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A. Electrostatic Force is 

  1. Conservative force
  2. Non-Conservative force
  3. Sometimes conservative and sometimes non-conservative
  4. Neither Conservative nor non-conservative

Answer 1

B. Potential at a point which is at vector position r due to charge Q placed at infinity is proportional to 

  1. Qr
  2. Q/r
  3. R/Q
  4. Q8Q 

Answer 2

C. Charges follow 

  1. Disorientation Principle
  2. Superposition Principle
  3. Neither Disorientation nor Superposition
  4. Both Disorientation and Superposition

Answer 2

D. Electrostatic field E is _____ in the interior of conductor

  1. Infinity
  2. Zero
  3. Postive
  4. Negative

Answer 2 

E. If electric potential of a region or a body is not changing it means that

  1. Electric field is infinite
  2. Electric field is zero 
  3. Electric field is positive
  4. Electric field is negative 

Answer 2

F. Please pick the correct option

  1. C = QV
  2. V = QC
  3. C = Q/V
  4. C = Q*Q*V

Answer 3

G. Please pick the correct statement

  1. A capacitor having low capacitance can store high amount of charge at low voltage
  2. A capacitor having high capacitance can store high amount of charge at high voltage
  3. A capacitor having high capacitance can store low amount of charge at low voltage
  4. A capacitor having high capacitance can store high amount of charge at low voltage

Answer 4

H. Please pick the correct statement

  1. The capacitor charge increases due to lowering of insulation strength of the intervening medium
  2. The capacitor charge fades due to increase  of insulation strength of the intervening medium
  3. The capacitor charge fades due to lowering of insulation strength of the intervening medium
  4. None of the above 

Answer 3

I. What is dielectric strength 

  1. It is electric strength of the insulator
  2. Highest Voltage required to produce a dielectric breakdown through the material
  3. Highest electric field required to produce a dielectric breakdown through the material
  4. All of the above

Answer 4

J. The potential on the surface of a hollow metal sphere is 100 V. Please pick the correct statement

  1. The potential at the center is zero
  2. The potential at the center is 100 V
  3. The potential at the center is 10 V
  4. The potential at the center is infinite

Answer 2

K. A charge is moved around a full circle of radius r. Circle has potential of 10 V 

  1. The work done by the charge is one unit
  2. The work done by the charge is zero
  3. The work done by the charge is 10 V
  4. None of the above

Answer 2 

L. Polarization is

  1. The Induction of net dipole moment in the dielectric due to the electric fields of the  charged plates
  2. Accumulation of positive charge one one plate of capacitor over other
  3. Accumulation of negative charge one one plate of capacitor over other
  4. Not a concept in capacitors 

Answer 1

Current Electricity

A. An accumulator stores 10 A current for 50 hours what is its capacity

  1. 5 Ah
  2. 500 Ah
  3. 50 Ah
  4. 10 Ah

Answer 2

B. What is Ohm’s law

  1. V = RI
  2. V = R/I
  3. R = VI
  4. R = V*V*I

Answer 1

C. The unit of current is

  1. Ampere
  2. Ohm
  3. Resistance
  4. None of the above

Answer 1

D. The resistance of a conductor is 

  1. Inversely proportional to length and inversely proportional to cross sectional area
  2. Directly proportional to length and directly proportional to cross sectional area 
  3. Directly proportional to length and inversely proportional to cross sectional area 
  4. Inversely  proportional to length and Inversely proportional to cross sectional area 

Answer 3

E. The resistivity of a material depends upon

  1. Temperature
  2. Pressure
  3. Temperature and pressure 
  4. Neither Temperature not pressure

Answer 3

F. Current density tells about

  1. Amount of charge flowing per second per unit area normal to flow
  2. Amount of charge flowing per minute per unit area normal to flow
  3. Amount of charge flowing per second per unit area parallel to flow
  4. Amount of charge flowing per minute per unit area parallel to flow

Answer 1

G. Ohm’s law fails when 

  1. V depends on I non-linearly 
  2. V depends on I in a non-unique way
  3. The correlation between V and I relies upon the sign of V for the same absolute value of V
  4. All of the above

Answer 4

H. What is Kirchhoff’s junction rule

  1. At a junction of circuit elements, the sum of the currents entering the junction is always equal to the sum of the currents leaving it
  2. At a junction of circuit elements, the sum of the currents entering the junction is always more than the sum of the currents leaving it
  3. At a junction of circuit elements, the sum of the currents entering the junction is always less than the sum of the currents leaving it
  4. At a junction of circuit elements, the sum of the currents entering the junction is always zero 

Answer 1

I. What is Kirchhoff’s loop rule

  1. The sum of changes in potential in a closed loop is always positive
  2. The sum of changes in potential in a closed loop is always negative
  3. The sum of potential in a closed loop is always negative
  4. The sum of changes in potential in a closed loop is always zero

Answer 4

J. Total resistance of 3 resistors connected in series is given by

R = total resistance

R 1 = resistance of first resistor

R 2 = resistance of second resistor

R 3 = resistance of third resistor

  1. R = R 3 * (R 1 / R 2)
  2. R = R 1 + R 2 + R 3
  3. R = R 3* R 2 * R 1
  4. 1/R = (1/R1 + 1/R2 + 1/R3)

Answer 2

K. Total resistance of 3 resistors connected in parallel is given by

R = total resistance

R 1 = resistance of first resistor

R 2 = resistance of second resistor

R 3 = resistance of third resistor

  1. R = R 3 * (R 1 / R 2)
  2. R = R 1 + R 2 + R 3
  3. R = R 3* R 2 * R 1
  4. 1/R = (1/R1 + 1/R2 + 1/R3)

Answer 4

L. Given in a whetstone bridge there are four resistances R 1, R 2, R 3 and R 4 what is the null point condition

  1. R 1*R2 = R 3 * R4
  2. R1/R2 = R 3 / R 4
  3. R 1 = R 2 / R 3
  4. R 2 = R 1 / R 2

Answer 2

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