List of top Questions asked in CBSE CLASS XII

Write two key features of HDTV.
Intermediate Frequency (IF) amplifier in TV receiver is used as
High power linear amplifier is used in the audio section of the TV transmitter. (True/False)
In a magnetic tape recorder, the erase signal is a ________ signal.
On which principle does a moving coil microphone work?
________ is a kind of loudspeaker driver used for low frequency range.
An analog sound recorder contains a sampler. (True/False)
Which of the following is not a part of carbon microphone?
In which of the following loudspeaker there is no diaphragm?
Laser beam is used:
What do you mean by occupational hygiene?
Fire extinguishers used to extinguish electrical fires are labelled as Class ________.
Which of the following is not a safety concern in a manufacturing industry?
Impedance, in general, is the opposition to voltage. (True/False)
Write any two merits of piezoelectric microphone.
Which of the following is not a protective equipment?
Frequency response of a microphone depends on nature of the metal diaphragm and the shape of the case. (True/False)
A ________ is a company that is in the first stage of its operations.
In which sector do green jobs contribute to the development and implementation of renewable energy sources?
Which view in a presentation application allows you to see all your slides at once?
What is self-awareness?
The process of establishing a hazardous location or agent at the workplace is called
Occupational diseases are generally caused by poor work or working conditions. (True/False)
Begin working on electrical equipments only when they are energized. (True/False)
Explain the good handling technique of lifting heavy load manually at workplace.