List of top Questions asked in CBSE CLASS XII

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:

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: