2nd Year Physics Chapter 5 Test19. Electric Potential and Capacitor

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Which material should be inserted between the plates of a capacitor in order to increase its capacitance?
   1. mica
   2. copper
   3. ron
   4. tin
2. If charged body is moved against the electric field, it will gain:
   1. P.E
   2. K.E
   3. mechanical energy
   4. electrical potential energy
3. In series combination of capacitors, the reciprocal of the equivalent capacitance is equal to:
   1. Sum of the capacitances
   2. Sum of the reciprocals of the capacitances
   3. Product of capacitances
   4. Difference of capacitances
4. The cell membrane acts like a:
   1. Resistor
   2. Battery
   3. Capacitor
   4. Generator
5. If a dielectric of relative permittivity εr between the plates of a charged capacitor is placed, its capacitance
   1. decreases
   2. increases
   3. remains same
   4. some time increases then decreases
6. Work done in bringing a unit positive charge from infinity to that point in an electric field is called
   1. potential difference
   2. resistance
   3. capacitance
   4. absolute potential
7. When the distance between the plates of a parallel plate capacitor is decreased, the capacity of the capacitor is
   1. increased
   2. decreased
   3. unchanged
   4. vanished
8. The time constant of an RC circuit is given by:
   1. R/C
   2. RC
   3. C/R
   4. 1/RC
9. Will a capacitor store more energy with a dielectric other than air?
   1. yes
   2. no
   3. any of the two
   4. none of these
10. Absolute potential difference, due to a point charge of 1 C at a distance of 1 m is given by
    1. 9 × 10⁶ volts
    2. 9 × 10⁷ volts
    3. 9 × 10⁸ volts
    4. 9 × 10⁹ volts