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
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Correct Answer: Cathode ray tube
Solution : The correct option is a Cathode ray tube.
The sealed glass vacuum tube you are describing is commonly known as a Cathode Ray Tube (CRT). In a CRT, an electron beam is generated at the cathode and is focused using electromagnetic fields as it travels toward the phosphor-coated glass screen. When the electron beam strikes the phosphor coating, it causes the emission of light, which forms the images on the screen.
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Question : Which type of glass is used for making glass reinforced plastic ?
Option 1: Pyrex glass
Option 2: Flint glass
Option 3: Quartz glass
Option 4: Fibre glass
Question : The mercury and sodium street lamps light up because of:
Option 1: Atomic emission
Option 2: Atomic absorption
Option 3: Electron emission
Option 4: Electron absorption
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 : When a strong beam of light is passed through a colloidal solution, the light will
Option 1: be scattered
Option 2: pass unchanged
Option 3: be absorbed
Option 4: be reflected
Question : Lens is made up of:
Option 3: Ordinary glass
Option 4: Cobalt glass
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