NEET PYQs for Capacitors and Capacitance with Solutions: Practice NEET Previous Year Questions

1.

A battery consists of a variable number ‘n’ of identical cells (having internal resistance ‘r’ each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the correct relationship between I and n ?

2.

A parallel plate capacitor is charged by connecting it to a battery through a resistor. If I is the current in the circuit, then in the gap between the plates :

• there is no current.
• displacement current of magnitude equal to 1 flows in the same direction as 1.
• displacement current of magnitude equal to 1 flows in a direction opposite to that of 1.
• displacement current of magnitude greater than 1 flows but can be in any direction.

3.

In the following circuit, the equivalent capacitance between terminal A and terminal B is :

• 2 µF
• 1 µF
• 0.5 µF
• 4 µF

4.

If the charge on a capacitor is doubled, the value of its capacitance $C$ will be

• doubled
• halved
• remain the same
• None of these

5.

The plates of a parallel plate capacitor are separated by d. Two slabs of different dielectric constant \(K_1\) and \(K_2\) with thickness \(d/2\) and \(d/2\) respectively are inserted in the capacitor. Due to this, the capacitance becomes two times larger than when there is nothing between the plates. If \(K_1 = 1.25 K_2\), the value of \(K_2\) is :

• \( 2.33 \)
  
• \( 1.60 \)
  
• \( 1.33 \)
  
• \( 2.66 \)
  

6.

The capacitance of a capacitor with charge q and a potential difference V depends on :

• both q and V
• the geometry of the capacitor
• q only
• V only

7.

The capacitance of a parallel plate capacitor with air as medium is $6\, \mu F$. With the introduction of a dielectric medium, the capacitance becomes 30 $\mu F.$ The permittivity of the medium is : $(\epsilon_0 = 8.85 \times 10^{-12} C^2N^{-1}m^{-2}$)

• $0.44 \times 10^{-13} C^2 N^{-1}m^{-2}$
• $1.77 \times 10^{-12} C^2 N^{-1}m^{-2}$
• $0.44 \times 10^{-10} C^2 N^{-1}m^{-2}$
• $5.00 \,C^2 N^{-1}m^{-2}$

8.

A 10 µF capacitor is connected to a 210 V, 50 Hz source as shown in figure. The peak current in the circuit is nearly (π = 3.14) :
:

• 0.58 A
• 0.93 A
• 1.20 A
• 0.35 A