List of top Electronics Technology Questions asked in CBSE CLASS XII

The process by which the information is modified with the help of locally generated carriers is called ___________.
(Scrambling / Modulation)
Which of the following is not a feature of HDTV?
A varactor diode is used in________________________ stage of a TV receiver.
FM modulator is used in_____________________ section of a TV transmitter.
(Audio / Video)
The picture tube of a TV receiver is known as_____________________.
(Visual tube / Cathode ray tube)
As compared to other storage media, a CD has lower signal-to-noise ratio. (True/False)
HF biasing is used in________________________.
(Magnetic tape recording / DVD recording)
Optical recording system needs a motor. (True/False)
In a CD recorder, the stage that combines digital data with error control and sync word is:
The play time of a DVD is:
Which of the following is not part of A to D Converter?
Ribbon tweeters are often used in place of horn loaded compression tweeters because:
What is the frequency range of flute?
Sound waves produced at the back of a loudspeaker are________________________ degrees out of phase with respect to sound waves produced in front.
The loudspeaker driver used for low frequency range is called_____________________.
Crystal microphones work based on:
A moving coil microphone is also called:
Decibel is the unit used to measure sound intensity. (True/False)
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)
Which of the following is not an occupational disease?
Identify the picture.
Almost all the accidents usually occur due to lack of safety. (True/False)