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physics 15 electroncs
Pg.No.
1
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Page 1
Q.1. Which branch of physics and technology concerned with the behaviour and movement of electrons?
Q.2. Who designed diode valve?
Q.3. What is the arrangment of two electrodes,a cathode heated by a filament and an anode ,placed inside a evacuated glass envelope,producing electric current called as?
Q.4. What is the cathode made of in diode valve?
Q.5. Which electrode emits electrons in diode valve?
Q.6. Diode valve acts as?
Q.7. Which device converts alternating current into direct current?
Q.8. Who designed triode valve?
Q.9. What is the modified form of usual diode ,consisting usual anode -cathode pair and one other electrode,control grid called as?
Q.10. What is used as amplifier,oscillator,transmitter and detector?
Q.11. Which materials have electrical conductivity lies between that of insulator and conductor at room temperature?
Q.12. Germanium and Silicon are examples of?
Q.13. Which is the extremely purest form of semi conductor?
Q.14. If a small amount of chemical impurity is added to intrinsic semi-conductor, it is known as?
Q.15. Extrinsic semi-conductor is also known as?
Q.16. What is the effect on conductivity of semi-conductor when it is doped with impurity?
Q.17. Extrinsic semi-conductor in which electrons are majority charge carriers is known as?
Q.18. Which type of impurity is added to semi-conductor to make it N type semi-conductor?
Q.19. Extrinsic semi-conductor in which holes are majority charge carriers is known as?
Q.20. Which type of impurity is added to semi-conductor to make it P type semi-conductor?
Q.21. Adding a chemical impurity to pure semi conductor is known as?
Q.22. Which impurities are know as donors?
Q.23. Which impurities are know as acceptors?
Q.24. With the increase in temperature the conductivity of semi conductor?
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