29/03/2020Electronics(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Electronics(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. A VTVM is never used to measure ………….. Current Voltage Resistance None of the above2. The following are legs of the transistor except Emitter Base Diode Collector3. A pn junction acts as a ………. Bidirectional switch Controlled switch None of the above Unidirectional switch4. In an unregulated power supply, if input a.c. voltage increases, the output voltage ……. Increases None of the above Decreases Remains the same5. Hartley oscillator is commonly used in …… Radio receivers None of the above Radio transmitters TV receivers6. The battery connections required to forward bias a pn junction are …… +ve terminal tonp and -ve terminal to n -ve terminal to p and –ve terminal to n None of the above -ve terminal to p and +ve terminal to n7. The piezoelectric effect in a crystal is …… A change in frequency because of temperature A change in resistance because of temperature None of the above A voltage developed because of mechanical stress8. A ring counter with 5 flip flops will have ………. states. 32 5 10 Infinite9. A semiconductor has ………… temperature coefficient of resistance. None of the above Zero Positive Negative10. If the crystal frequency changes with temperature, we say that crystal has ………….. temperature coefficient Negative Positive Zero None of the above11. In a phase shift oscillator, the frequency determining elements are R and C L and C R, L and C None of the above12. A material with low reluctance and high permeability such as iron or soft steel is used to make what type of magnet? Natural Permanent Temporary Residual13. Two multimeters A and B have sensitivities of 10 kΩ/V and 30 kΩ/V respectively. Then Multimeter A is more sensitive None of the above Both are equally sensitive Multimeter B is more sensitive14. The number of electrons in the outermost shell of an atom determines which of the following characteristics of the atom? Number of shells Atomic weight Atomic Number Valence15. If a multimeter has a sensitivity of 1000 Ω per volt and reads 50 V full scale, its internal resistance is ………. 50 kΩ 20 kΩ 10 kΩ None of the above16. A hole and electron in close proximity would tend to ………. Repel each other None of the above Attract each other Have no effect on each other17. Addition of trivalent impurity to a semiconductor creates many …….. Free electrons Valence electrons Bound electrons Holes18. The sensitivity of a multimeter is given in .... amperes kΩ/V None of the above Ω19. The random motion of holes and free electrons due to thermal agitation is called ………. Ionisation Pressure Diiffusion None of the above20. When a pure semiconductor is heated, its resistance ………….. Goes down Remains the same Goes up Can't say21. What subatomic particle has a negative charge and a small mass? Positron Neutron Proton Electron22. For the gate in the given figure the output will be ……….. Ā 0 1 A23. An n-type semiconductor is ……… Electrically neutral None of the above Positively charged Negatively charged24. A Zener diode utilises ………… characteristic for voltage regulation None of the above Reverse Forward Both forward and reverse25. A galvanometer in series with a high resistance is called ……… A voltmter An ammmeter None of the above A wattmeter26 out of 25Time is Up!