# Practice Test

Q1) The capacitance of a capacitor depends on Show Answer

Q2) 1 F equals Show Answer

Q3) A 900 p F capacitor is charged by 100 V battery. The electrostatic energy stored by the capacitor is Show Answer

Q4) A 900 p F capacitor connected to a 100 V battery is disconnected from the battery and connected to another 900 pF capacitor. The electrostatic energy stored by the system is Show Answer

Q5) A parallel plate capacitor with air between the plates has a capacitance of 8 pF. What will be the capacitance if the distance between the plates is reduced by half and the space between them is filled with a space substance of dielectric constant 6. Show Answer

Q6) Three capacitors each of capacitance 9 pF are connected in series, across a 120 V supply. The total capacitance of the combination and the potential difference across each capacitor are respecitvely : Show Answer

Q7) Three capacitors of capacitances 2 pF, 3 pF and 4 pF are connected in parallel across a 100 V supply. The total capacitance of combination and the charge on 3 pF capacitor are respectively : Show Answer

Q8) The area of the plates of a 2 F parallel plate capacitor, given that the separation is 0.5 cm is: Show Answer

Q9) The dimensions of capacitance are Show Answer

Q10) The equivalent capacitance of the network is Show Answer

Q11) If this capacitor is connected to a 100 V supply, what is the charge on the capacitor? Show Answer

Q12) A 3 mm mica sheet (of dielectric constant = 6) was inserted between the plates while the voltage supply remained connected, the charge on the capacitor Show Answer

Q13) If the mica sheet is inserted after the supply is disconnected then the voltage across the capacitor Show Answer

Q14) The subsequent charges on the 600 pF and 200 pF capacitor are respectively. Show Answer

Q15) The electrostatic energy lost is Show Answer

Q16) A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor. Show Answer

Q17) A parallel plate condenser with oil between the plates (dielectric constant of oil K = 2) has a capacitance C . If the oil is removed, then capacitance of the capacitor becomes Show Answer

Q18) In a parallel-plate capacitor, the region between the plates is completely filled by a dielectric slab. The capacitor is charged from a battery and then disconnected from it. The dielectric slab is now taken out. Which of the following is correct? Show Answer

Q19) The internal and external radii of a cylindrical condenser are both doubled. Its capacity will be Show Answer

Q20) Three identical capacitor are combined differently. For the same voltage to each combination, the one that stores the greatest energy is Show Answer

Q21) The capacity of a parallel plate condenser is 12 pF. If the area of both the plates is doubled and the distance between them is reduced to half, the capacity of the condenser will be Show Answer

Q22) Which one of the following methods will reduce the capacitance of a parallel plate capacitor? Show Answer

Q23) A thin metal plate is inserted between the plates of a parallel plate capacitor of capacitance C in such a way that its edges touch the two plates. The capacitance now becomes Show Answer

Q24) Statement 1 : If a dielectric is placed in external field then field inside dielectric will be less than applied field.
Statement 2 : Electric field will induce dipole moment opposite to field direction. Show Answer

Q25) Statement 1 : Capacitance of a system of two conductors at finite separations, separated by some insulating medium, depends on geometry of the conductors and properties of insulating medium separating the conductors.
Statement 2 : Capacitance of a capacitor does not depend on charge stored by the capacitor.

Q26) In a parallel-plate capacitor, the region between the plates is filled by a dielectric slab. The capacitor is connected to a battery and the slab is taken out. Which of the following is correct? Show Answer

Q27) A parallel plate air capacitor is charged to a potential difference V. After disconnecting the battery, the distance between the plates of the capacitor is increased using an insulating handle. As a result, potential difference between the plates Show Answer

Q28) A parallel plate capacitor is made by stacking n equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is C then the resultant capacitance is Show Answer

Q29) What fraction of the energy drawn from the charging battery is stored in a capacitor? Show Answer

Q30) The area of the plates of a parallel plate condenser is A and the distance between the plates is 10 mm. There are two dielectric sheets in it, one of dielectric constant 10 and thickness 6 mm and the other dielectric constant 5 and thickness 4 mm. The capacity of the condenser is Show Answer

Q31) Statement 1 : Capacitance of a parallel plate capacitor increases if a metallic slab is introduced in between the plates of the capacitor.
Statement 2 : For same charge stored by the plates of capacitor, electrostatic potential energy of the system is more if a metallic slab is introduced in between plates of the capacitor. Show Answer

Q32) Statement 1 : There can be potential difference between two adjacent conductors that carry the same amount of positive charge.
Statement 2 : Capacitance of a conductor depends on the size. Show Answer

Q33) The work done by the battery is Show Answer

Q34) Thermal energy produced in the circuit is Show Answer