List of top Questions asked in CBSE CLASS XII

Write a short note on occupational hazards.
What is a loudspeaker? Write names of different types of loudspeakers.
Explain the working and features of remote control of TV receiver.
The device used in microwave oven to match power between source and load is called circulator. (True/False)
In which year was the telephone invented?
In a FAX machine if the printed image is dirty, then:
______________________________ is referred to as ‘heart’ of the image formation system in a printer.
How can you acquire good listening skills?
Why is self-motivation important?
How do you select a range of cells in a spreadsheet?
The picture tube of a TV receiver is known as_____________________.
(Visual tube / Cathode ray tube)
FM modulator is used in_____________________ section of a TV transmitter.
(Audio / Video)
A varactor diode is used in________________________ stage of a TV receiver.
Which of the following is not a feature of HDTV?
The process by which the information is modified with the help of locally generated carriers is called ___________.
(Scrambling / Modulation)
In TV transmission, aspect ratio is the ratio between:
A magnetron is used in_____________________.
Scanner is used to transfer images into digital form. (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?
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)