List of top Questions asked in CBSE CLASS XII

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)

Decibel is the unit used to measure sound intensity. (True/False)

A moving coil microphone is also called:

Crystal microphones work based on:

The loudspeaker driver used for low frequency range is called_____________________.

Sound waves produced at the back of a loudspeaker are________________________ degrees out of phase with respect to sound waves produced in front.

What is the frequency range of flute?

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?

The process of identification of hazards in the workplace and their associated effect on health is called evaluation. (True/False)

Damaged cables must be repaired or removed from service immediately. (True/False)

In three-prong plugs, the third prong works as:

Maintenance and servicing of machines in large manufacturing industries are done:

Discuss the costume worn by men and women in ancient Greek civilization.