Thermionic Emission 1. Mention the parts of cathode ray oscilloscope? Electron gun A system of plates for deflecting the electron beam A fluorescent screen at one end of the glass envelope All of the above Question 1 of 19 2. How is horizontal deflection achieved in an oscilloscope? By discharging the polarity between the horizontal and vertical plates of the anode By charging and changing the polarity between the vertically mounted plates of the anode By charging and changing the polarity between the horizontally mounted plates of the anode.None Question 2 of 19 3. Why is the tube evacuated in the cathode ray tube? To attract and accelerate the electrons To emit more electrons To prevent electrons from interacting with any particles before reaching the screen For safety reason Question 3 of 19 4. Define Thermionic emission The process of receiving electrons due to heat energy The process of emission of electrons due to chemical reaction The process of emission of electrons due to thermal excitation by heat energy None of the mentioned Question 4 of 19 5. Which of the following is NOT among the uses of a cathode ray oscilloscope? Used as a voltmeter Used to detect tumorsUsed as television tube Used to detect metal flawsQuestion 5 of 19 6. Mention the 2 types of deflection in an oscilloscope Vertical Diagonal HorizontalparallelQuestion 6 of 19 7. In the cathode ray tube, which part of it emits electrons by thermionic emission? Anode Cathode Fluorescent screen None of the mentioned Question 7 of 19 8. What causes the electric field between the anodes in a cathode ray oscilloscope? Potentiometer Potential difference Rheostat Capacitor Question 8 of 19 9. Explain how a greater degree of focusing of cathode ray beams is achieved in an oscilloscope? Using a greater potential difference between the anode plates Generating greater electric field intensity between the anode platesA fuse box used all of the aboveQuestion 9 of 19 10. Cathode rays are a stream of fast moving electrons? False True Maybe None Question 10 of 19 11. In a cathode ray oscilloscope which part is used to supply the electrons to be directed towards the screen? Glass envelope A system of plates Fluorescent screen Electron gun Question 11 of 19 12. State the reason why the screen of the cathode ray tube oscilloscope coated with graphite? The conduction of electrons to earth Shielding the beam from external electric fields Accelerating the electrons towards the screenAll of the above Question 12 of 19 13. Which type of current is supplied to the Extra High Tension (EHT) source of the cathode ray oscilloscope? A.C D.C HIGH VOLTAGE NONE Question 13 of 19 14. Name what controls the intensity of the cathode ray beam in an oscilloscope Anodes Cathode The grid The screenQuestion 14 of 19 15. Mention the properties of cathode rays They travel in straight lines They cause certain substances to glow or fluoresce They are charged All of the above Question 15 of 19 16. Which of the following statement is INCORRECT about Cathode rays? They are deflected by both magnetic and electric fieldCathode rays are deflected towards the positive plate of an electric field Cathode rays are negatively charged Cathode rays travel at the speed of lightQuestion 16 of 19 17. How is vertical deflection achieved in an oscilloscope? By charging and changing the polarity between the vertical plates of the anode by charging and changing the polarity between the horizontal plates of the anode By discharging the polarity between the horizontal and vertical plates of the anode. None Question 17 of 19 18. Which part of the cathode ray tube attracts electrons? Cathode Fluorescent screen Anode None Question 18 of 19 19. What is produced when cathode rays are suddenly stopped by a metal target? Gamma rays Infrared raysX-rays All of the aboveQuestion 19 of 19 Loading...
