Test: Capacitors and Capacitance (November 15) - NEET MCQ

# Test: Capacitors and Capacitance (November 15) - NEET MCQ

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## 10 Questions MCQ Test Daily Test for NEET Preparation - Test: Capacitors and Capacitance (November 15)

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Test: Capacitors and Capacitance (November 15) - Question 1

### In a parallel plate capacitor, the capacity increases if

Detailed Solution for Test: Capacitors and Capacitance (November 15) - Question 1

In a parallel plate capacitor the capacity of capacitor.

The capacity of capacitor increases if area of the plate is increased.

Test: Capacitors and Capacitance (November 15) - Question 2

### The distance between the plates of a capacitor is d. What will be the new capacitance if a metal plate of thickness d/2 is introduced between the plates without touching them

Detailed Solution for Test: Capacitors and Capacitance (November 15) - Question 2

Definition based

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Test: Capacitors and Capacitance (November 15) - Question 3

### A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is

Detailed Solution for Test: Capacitors and Capacitance (November 15) - Question 3

Q = CV

Test: Capacitors and Capacitance (November 15) - Question 4

A parallel plate capacitor is connected to a battery as shown in figure. Consider two situations

(i) key KK is kept closed and plates of capacitors are moved apart using insulating handle
(ii) key KK is opened and plates of capacitors are moved apart using insulating handle
Which of the following statements is correct?

Detailed Solution for Test: Capacitors and Capacitance (November 15) - Question 4

When key K is kept closed, condenser C is charged to potential V. When plates of capacitors are moved apart, its capacitance, C = ϵoA/d decreases.
As potential of condenser remains same, charge Q = CV decreases. So option is correct. Once key K is closed, condenser gets charged, Q = CV.
Now, if key K is opened, battery is disconnected, no more charging can occur i.e. Q remains same.
As plates or capacitor are moved apart, its capacity C = ϵoA/d decreases.
Therefore, its potential, V = q/C increases

Test: Capacitors and Capacitance (November 15) - Question 5

Increasing the charge on the plates of a capacitor means

Detailed Solution for Test: Capacitors and Capacitance (November 15) - Question 5

Q = CV, where C is decided only by the geometrical factors

Test: Capacitors and Capacitance (November 15) - Question 6

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

Detailed Solution for Test: Capacitors and Capacitance (November 15) - Question 6

Correct answer is A.

Test: Capacitors and Capacitance (November 15) - Question 7

Work done in charging a capacitor is stored in it in the form of electrostatic energy, given by

Detailed Solution for Test: Capacitors and Capacitance (November 15) - Question 7

W = Energy stored in the capacitor

Test: Capacitors and Capacitance (November 15) - Question 8

What should be the radius of an isolated spherical conductor so that it has a capacity of 2μF?​

Detailed Solution for Test: Capacitors and Capacitance (November 15) - Question 8

Capacitance of an isolated spherical conductor =4π€R , where €=permittivity of vacuum
C=2×10-6F
C=4π€R
4×3.14×8.85×10-12×R=2×10-6
R=2×10-6/4×3.14×8.85×10-12
=1.8×104 m

Test: Capacitors and Capacitance (November 15) - Question 9

Which of the following is a non polar dielectric?

Detailed Solution for Test: Capacitors and Capacitance (November 15) - Question 9

Alcohol and HCl are polar molecules since they have a net dipole moment towards a particular direction. Both water and benzene are non-polar molecules. But water is a conductor of electricity, whereas benzene is a dielectric (insulator).

Test: Capacitors and Capacitance (November 15) - Question 10

Capacitor preferred when there is a high frequency in the circuits is ______

Detailed Solution for Test: Capacitors and Capacitance (November 15) - Question 10

Mica capacitors are preferred for high frequency circuits because they have low ohmic losses and less reactance.

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