Explore topic-wise MCQs in Physics.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

What is the maximum energy that can be stored in a capacitor?

A. Depends on the maximum area of the capacitor
B. Depends on the maximum resistance offered
C. Depends on the maximum electric field
D. Depends on the maximum current passing through the capacitor
Answer» D. Depends on the maximum current passing through the capacitor
Discussion
2.

A 6 F capacitor is charged by a 100V supply. It is then disconnected from the supply and is connected to another uncharged 3 F capacitor. How much electrostatic energy of the first capacitor is dissipated in the form of heat and electromagnetic radiation?

A. 3 x 10<sup>-2</sup> J
B. 2 x 10<sup>-2</sup> J
C. 1 x 10<sup>-2</sup> J
D. 4 x 10<sup>-2</sup> J
Answer» D. 4 x 10<sup>-2</sup> J
Discussion
3.

Initially the potential difference of a 8 F capacitor is 30 V. Then it is changed to 40 V. What is the increase in energy?

A. 28 10<sup>-4</sup> J
B. 18 10<sup>-4</sup> J
C. 8 10<sup>-4</sup> J
D. 24 10<sup>-4</sup> J
Answer» B. 18 10<sup>-4</sup> J
Discussion
4.

In a capacitor, energy is stored in the form of electric field.

A. True
B. False
Answer» B. False
Discussion
5.

A capacitor of capacitance 5 F is charged to 50 V and another capacitor of capacitance 7 F is charged to 42 V. These two are connected together. On doing so, what is the energy lost by the 5 F capacitor?

A. 2.35 mJ
B. 2.45 mJ
C. 2.55 mJ
D. 2.25 mJ
Answer» E.
Discussion
6.

Pick out the expression for energy stored in a capacitor from the following.

A. U = 2CV<sup>2</sup>
B. U = ( frac {1}{2} ) (Q<sup>2</sup>C)
C. U = ( frac {1}{2} ) (QV)
D. U = ( frac {1}{2} ( frac {C}{V^2}) )
Answer» D. U = ( frac {1}{2} ( frac {C}{V^2}) )
Discussion