Wednesday, 21 September 2022

Capacitance: MCQ ON CAPACITOR

 

Capacitor is an arrangement of two conductors carrying charges of equal magnitude and opposite sign and separated by an insulating medium.


(i) The net charge on the capacitor as a whole is zero. When we say that acapacitor has a charge Q, we mean that positively charged conductor has a charge +Q and the negatively charged conductor has a charge -Q.

(ii) The positively charged conductor is at a higher potential than negatively charged conductor. The potential difference V between the conductors is proportional to the magnitude of charge Q and the ratio Q/V is known as capacitance C of the capacitor. 

(iii) Unit of capacitance is farad (F). The capacitance is usually measured in microfarad (μF)


Q1 In which form is energy stored in a charged capacitor?

  • Mechanical energy 
  • Kinetic energy
  • Electrical energy 
  • none of these

  • Electrical energy 

 


Q2 Capacitance of a parallel plate capacitor depends upon

  • Surface area of plates
  • distance between plates
  • potential
  • both (a) and (b)

  • both (a) and (b)


Q3 Capacitance is the ratio of

  • `\frac{Q}{V^{2}}`
  • `\frac{Q^{2}}{V}`
  • `\frac{V^{2}}{Q}`
  • `\frac{Q}{V}`

  • `\frac{Q}{V}`

Q4 What happens to the capacitance of a capacitor when dielectric slab is placed inside it?

  • decreases 
  • increases
  • remains same 
  • none of these

  • increases


Q5 Capacity of spherical conductor depends upon

  • Area 
  • Volume
  • Radius 
  • Both (a) and (b)

  • Radius 


Q6 The SI unit of capacitance is 

  • Farad
  • volt 
  • Ampere
  • all of these

  • Farad


Q7 Capacitance is a vector quantity.

  • True
  • False

False


Q8 Capacitor is used to store...... 

  • Neutron
  • Charge
  • Current
  • None of these 

  • Charge

Q9 Total parallel capacitance is less than that of the smallest capacitor in parallel.(True/ False) 

  • True
  • False 

  • False 


Q10 N capacitors having capacitance C are connected in series, calculate the equivalent capacitance

  • C/N
  • CN
  • N/C
  • None of these 

  • C/N


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