Explore topic-wise MCQs in Physics.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

Find the wrong statement.

A. An electron gun is to create electrons and then accelerate them to a very high speed
B. Thermionic emissions and photoelectric emissions are the same
C. The kinetic energy of photoelectrons vary
D. Vacuum tubes are thermionic devices
Answer» C. The kinetic energy of photoelectrons vary
Discussion
2.

Thermionic emission is dependent on temperature.

A. True
B. False
Answer» B. False
Discussion
3.

Which of the following are quick electron emissions?

A. Photoelectric emission
B. Field emission
C. Secondary emission
D. Thermionic emission
Answer» C. Secondary emission
Discussion
4.

How many types of electron emissions exist?

A. 2
B. 3
C. 4
D. 1
Answer» D. 1
Discussion
5.

Identify the process in which an electron escapes from the metal surface.

A. Electron emission
B. Electron displacement
C. Electron transgression
D. Electron movement
Answer» B. Electron displacement
Discussion