Electronics, semiconductors, electrons , Materials, Devices and Simple Circuits.
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1. A potential difference is developed across the depletion region of p-n junction due to ?
- Excess of protonscorrect
- Both A and B
- Negative ions
- Positive ions
- Excess of electrons
2. Crystal of germanium or silicon in its form at absolute zero acts as ?
- Both A and B
- A semiconductor
- An insulator
- Both A and Ccorrect
- A conductor
3. A potential barrier of 0.7V exists across p-n junction made from ?
- Gallium
- Arsenic
- Germanium
- Siliconcorrect
4. All the valence electrons present in a crystal of silicon are bound in the their orbits by ?
- Molecular bond
- Both A and B
- Both B and C
- Ironic bondcorrect
- Covalent bond
5. Computer chips are made from ?
- Strontium
- Aluminnium
- Siliconcorrect
- Helium
- Iron
6. The use of chips in electrons is described in the form of ?
- White boxes
- Orange boxescorrect
- Yellow boxes
- Black boxes
- Red boxes
7. Potential barrier across the p-n junction ?
- Starts further diffusion of electrons into p-regioncorrect
- Stops further diffusion of electrons into p-region
- All of these
- Stop further diffusion of electrons into n-region
8. The impurity in the germanium is usually in the ratio of ?
A = 1 : 10 4
B = 1 : 10 8
C = 1 : 10 12
D = 1 : 10 16
- B
- A
- C
- Dcorrect
9. Majority charge carriers in the break, it creates ?
- Electronscorrect
- Positrons
- Neutrons
- Holes
- None of these
10. In a p-n junction, the current flows due to ?
- Both A and Bcorrect
- Free electrons only
- Positrons only
- Both A and C
- Holes only
11. Whenever a covalent bond breaks, it creates ?
- An electron-hole pair
- An electron
- A positroncorrect
- A hole
12. Atomic number of germanium atom and number of valence electrons in if are respectively ?
- 22, 3
- 4, 32
- 32, 4
- 4,14
- 14, 4correct
13. In a p-n junction, the current flows due to ?
- Arsenic
- Germanium
- Gallium
- Siliconcorrect
14. In the forward biased situation, the current flowing across the p-n junction is a few ?
- Micro amperescorrect
- Pico amperes
- Amperes
- None of these
- Milli amperes
15. Depletion region contains ?
- Positive ions
- Protons
- Negative ions
- Both B and Ccorrect
16. Silicon is one of the most commonly used ?
- Semiconductorcorrect
- Both B and C
- Insulator
- Conductor
- Dielectric
17. The huge advances in electronics over the recent past are due to discovery and use of ?
- Semiconductors
- Heavy water
- Insulatorscorrect
- Iron
- Conductors
18. A p-type crystal is ?
- Pure crystal
- Neutral as a whole
- Impurity added crystalcorrect
- Both A and B
19. As a result of diffusion, a region is formed around the p-n junction which is a ?
- Negatively charged region
- Positively charges region
- Depletion regioncorrect
- Chargeless region
20. At room temperature, crystal of germanium in its pure form, act as ?
- A semiconductorcorrect
- None of these
- A conductor
- Both A and C
- An insulator
21. When phosphorus is added as an impurity in germanium, there is an increase in ?
- Holes in Ge
- Positrons in Ge
- Both A and Bcorrect
- Free electron in Ge
22. The external potential difference applied to p-n junction (made from germanium) in case of forward biased situation must be grater than ?
- 0.7 V
- 300 mV
- 0.3 Vcorrect
- 700 mV
- Both B and C
23. The external potential difference applied to p-n junction for forward biasing, supplies energy to ?
- Holes in n-region
- Both A and B
- Both A and C
- Free electrons in n-region
- Holes in p-regioncorrect
24. The potential barrier across the depletion region in case of silicon and germanium are respectively ?
- 0.3 V , 0.7 V
- 0.3 V , 0.1 Vcorrect
- 0.7 V , 0.3 V
- 0.7 V , 0.01 V
25. An outer most orbit represents stable configuration if it possesses ?
- 8 electrons
- No electron
- 4 electrons
- 16 electronscorrect
- 12 electrons