29/03/2020 Electronics(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. Which of the following is NOT a property of magnetic lines of force? They leave the north pole and enter the south pole of the magnetThey leave the magnetic material at right angles to the surfaceThey form closed loops around the magnetThey cross each other at right angles2. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ………..Remains the sameIncreasesNone of the aboveDecreases3. An oscillator produces……………. oscillationsModulatedDampedNone of the aboveUndamped4. A voltmeter should have ………. resistanceVery highNone of the aboveZeroVery low5. To limit current in LED, resistor should be connected inseriesparallelionized tubeevacuated flask6. A semiconductor is formed by ……… bonds.None of the aboveCovalentCo-ordinateElectrovalent7. When a pure semiconductor is heated, its resistance …………..Goes downGoes upRemains the sameCan't say8. A VTVM is never used to measure …………..VoltageNone of the aboveResistanceCurrent9. In an unregulated power supply, if input a.c. voltage increases, the output voltage …….DecreasesIncreasesNone of the aboveRemains the same10. A semiconductor has ………… temperature coefficient of resistance.None of the abovePositiveZeroNegative11. 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 ………14.5 ns95 ns20 ns9.5 ns12. An ammeter should have ………….. resistanceVery largeNone of the aboveVery lowInfinite13. 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 filingsThe electrostatic fieldThe piezoelectric effectThe magnetic field14. A voltmeter is connected in a ………….. with the circuit component across which potential difference is to be measuredSeries or parallelParallelNone of the aboveSeries15. Magnetic materials have which of the following qualities?They are electrical insulatorsBoth 1 and 2 aboveThey can be magnetizedThey are attracted by magnets16. In a phase shift oscillator, the frequency determining elements areNone of the aboveR, L and CL and CR and C17. The number of electrons in the outermost shell of an atom determines which of the following characteristics of the atom?Number of shellsAtomic NumberValenceAtomic weight18. The resistivity of pure germanium under standard conditions is about ……….60 Ωcm6e4 Ωcm3e6 Ωcm6e4 Ωcm19. If the full-scale deflection current of a multimeter is 50 μA, its sensitivity is ……..50 kΩ/V20 kΩ/V100 kΩ/V10 kΩ/V20. The battery connections required to forward bias a pn junction are ……None of the above+ve terminal tonp and -ve terminal to n-ve terminal to p and –ve terminal to n-ve terminal to p and +ve terminal to n21. The number of electrons in the outermost shell of an atom determines which of the following characteristics of the atom?Atomic weightNumber of shellsValenceAtomic number22. Output resistance of an actual op-amp is75Ω46Ω45Ω70Ω23. What is the total resistance of a voltmeter on the 10 V range when the meter movement is rated for 50 μA of full-scale current?None of the above20 kΩ200 kΩ10 kΩ24. When an atom gains or loses an electron, which of the following terms applies?UnbalancedIonizedNeutralLightened25. What subatomic particle has a positive charge and a large mass? ProtonPositronNeutronElectron26 out of 25Time is Up!