29/03/2020 Electronics(Senior Class Physics Study by Topics) 29/03/2020 0Comments by Gate Academy Welcome to your Electronics(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. An atom that contains 6 protons and 5 electrons has what electrical charge? Neutral Intermediate Positive Negative 2. If a glass plate is placed over a magnet and iron filings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate? The chemical reaction of the magnet and the filings The magnetic field The electrostatic field The piezoelectric effect 3. A pentavalent impurity has ………. Valence electrons 4 6 3 5 4. The most commonly used semiconductor is ……….. Germanium Carbon Silicon Sulphur 5. For the gate in the given figure the output will be ……….. 1 0 A Ā 6. The law of magnetic poles states which of the following relationships? Like poles repel, unlike poles repel Like poles attract, unlike poles repel Like poles attract, unlike poles attract Like poles repel, unlike poles attract 7. The number of electrons in the outermost shell of an atom determines which of the following characteristics of the atom? Atomic weight Valence Atomic number Number of shells 8. When a pentavalent impurity is added to a pure semiconductor, it becomes ……… An intrinsic semiconductor n-type semiconductor p-type semiconductor An insulator 9. The circuit in the given figure is a ………… gate. positive logic AND gate positive logic OR gate negative logic OR gate negative logic AND gate 10. The resistivity of pure germanium under standard conditions is about ………. 6e4 Ωcm 60 Ωcm 3e6 Ωcm 11. When an ammeter is inserted in the circuit, the circuit current will …… Decrease Increase None of the above Remain the same 12. A trivalent impurity has ….. valence electrons 3 5 6 4 13. A semiconductor has generally ……………… valence electrons. 2 4 3 6 14. A forward biased pn junction diode has a resistance of the order of kΩ Ω MΩ None of the above 15. In an unregulated power supply, if input a.c. voltage increases, the output voltage ……. Increases None of the above Decreases Remains the same 16. An n-type semiconductor is ……… Positively charged Electrically neutral Negatively charged None of the above 17. In a semiconductor, current conduction is due to …….. Only free electrons Holes and free electrons Only holes None of the above 18. Two multimeters A and B have sensitivities of 10 kΩ/V and 30 kΩ/V respectively. Then Both are equally sensitive None of the above Multimeter A is more sensitive Multimeter B is more sensitive 19. A semiconductor has ………… temperature coefficient of resistance. Zero Positive Negative None of the above 20. The resolution of an n bit DAC with a maximum input of 5 V is 5 mV. The value of n is ……. 11 8 10 9 21. The universal gate is …… AND gate OR gate NAND gate None of the above 22. The access time of a word in 4 MB main memory is 100 ms. The access time of a word in a 32 kb data cache memory is 10 ns. The average data cache bit ratio is 0.95. The efficiency of memory access time is ……… 95 ns 20 ns 14.5 ns 9.5 ns 23. A semiconductor is formed by ……… bonds. Electrovalent Covalent Co-ordinate None of the above 24. An oscillator produces……………. oscillations Undamped Modulated None of the above Damped 25. The sensitivity of a multimeter is given in .... None of the above kΩ/V Ω amperes 1 out of 25 Time is Up! Time's up