List of top Electronics Technology Questions asked in CBSE CLASS XII

What are the possible problems that can occur at different subsections of cable TV?
Explain working, merits, demerits and application of moving coil microphone.
What are the precautions to be taken to prevent electric shock?
Explain the working principle of microwave oven.
With the help of a block diagram, explain the working principle of disc recording system.
Write some general causes of failure of recorder/player.
Explain the working and features of remote control of TV receiver.
What is a loudspeaker? Write names of different types of loudspeakers.
Write a short note on occupational hazards.
What are the faults which may occur in scanners?
What is the function of DC Biasing?
Write a short note on Tweeter.
Explain the process of scrambling.
Write any four steps that green jobs perform to reduce greenhouse gas emissions.
Write any two roles and functions of entrepreneurship.
How do you select a range of cells in a spreadsheet?
Why is self-motivation important?
How can you acquire good listening skills?
______________________________ is referred to as ‘heart’ of the image formation system in a printer.
In a FAX machine if the printed image is dirty, then:
In which year was the telephone invented?
The device used in microwave oven to match power between source and load is called circulator. (True/False)
Scanner is used to transfer images into digital form. (True/False)
A magnetron is used in_____________________.
In TV transmission, aspect ratio is the ratio between: