Question : Which one among the following components is used as an. amplifying device?

Option 1: Transformer

Option 2: Diode

Option 3: Capacitor

Option 4: Transistor

Question : Identify the sealed glass vacuum tube containing an electron beam that is focused on a phosphor-coated glass screen when light is emitted.

Option 1: Cathode ray tube

Option 2: Flat array tube

Option 3: Light Emitting Diode tube

Option 4: Liquid Crystal Display tube

Question : Endoscope is an instrument used to detect the ulcers in the stomach has a long narrow tube (with a small glowing bulb at one end) which is inserted in to the stomach through the mouth contains.

Option 1: small current carrying wire

Option 2: a narrow tube containing water

Option 3: optical fibre

Option 4: a narrow tube containing some chemical solution

Question : A non-SI unit called 'nit' is the unit of which of the following photometric quantities is used to measure a multitude of light intensities?

Option 1: Luminous exposure

Option 2: Luminance

Option 3: Luminosity

Option 4: Luminous emittance

Question : What is the name of the device used to convert alternating current into direct current?

Option 1: Ammeter

Option 2: Galvanometer

Option 3: Rectifier

Option 4: Transformer