List of top Electronics Technology Questions asked in CBSE Class Twelve Board Exam

A varactor diode is used in________________________ stage of a TV receiver.
Which of the following is not a feature of HDTV?
In TV transmission, aspect ratio is the ratio between:
Scanner is used to transfer images into digital form. (True/False)
A magnetron is used in_____________________.
The play time of a DVD is:
In a CD recorder, the stage that combines digital data with error control and sync word is:
Optical recording system needs a motor. (True/False)
HF biasing is used in________________________.
(Magnetic tape recording / DVD recording)
As compared to other storage media, a CD has lower signal-to-noise ratio. (True/False)
Ribbon tweeters are often used in place of horn loaded compression tweeters because:
Which of the following is not part of A to D Converter?
What is the frequency range of flute?
The loudspeaker driver used for low frequency range is called_____________________.
A moving coil microphone is also called:
Crystal microphones work based on:
Sound waves produced at the back of a loudspeaker are________________________ degrees out of phase with respect to sound waves produced in front.
Decibel is the unit used to measure sound intensity. (True/False)
Almost all the accidents usually occur due to lack of safety. (True/False)
Identify the picture.
Which of the following is not an occupational disease?
Maintenance and servicing of machines in large manufacturing industries are done:
In three-prong plugs, the third prong works as:
Damaged cables must be repaired or removed from service immediately. (True/False)
The process of identification of hazards in the workplace and their associated effect on health is called evaluation. (True/False)