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 imaginary line used to illustrate a magnetic effect is known as a/an Force field pole Magnetic line of force Magnetic pole Electrostatic line of force 2. If light energy collides with an orbiting electron, what happens to the electron? The electron will jump to an orbit closer to the nucleus The electron will jump to an orbit further from the nucleus The electron will merge with the nucleus The electron will move around the same orbit faster 3. When a pure semiconductor is heated, its resistance ………….. Remains the same Goes up Can't say Goes down 4. 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? 10 kΩ 20 kΩ None of the above 200 kΩ 5. Magnetic materials have which of the following qualities? They are electrical insulators They can be magnetized They are attracted by magnets Both 1 and 2 above 6. A power supply which has voltage regulation of ……….. is unregulated power supply 10% 0% 8% 5% 7. Which of the following is NOT a property of magnetic lines of force? They leave the magnetic material at right angles to the surface They cross each other at right angles They leave the north pole and enter the south pole of the magnet They form closed loops around the magnet 8. The resistivity of a pure silicon is about …………… 6e-8 Ωcm 6000 Ωcm 3e5 Ωcm 100 Ωcm 9. An ammeter is connected in …………….. with the circuit element whose current we wish to measure Parallel None of the above Series or parallel Series 10. What subatomic particle has a negative charge and a small mass? Positron Proton Electron Neutron 11. A material with low reluctance and high permeability such as iron or soft steel is used to make what type of magnet? Residual Temporary Permanent Natural 12. In a semiconductor, current conduction is due to …….. None of the above Only free electrons Holes and free electrons Only holes 13. The materil used to coat inside the face of CRT is ………… Silicon Sulphur Carbon Phosphorous 14. For display of signal pattern ………… voltage is applied to the horizontal plates of a CRO None of the above Sinusoidal Sawtooth Rectangular 15. The application where one would most likely find a crystal oscillator is …………….. AF sweep generator Radio transmitter None of the above Radio receiver 16. A trivalent impurity has ….. valence electrons 6 4 5 3 17. The north indicating pole of a compass needle is attracted to which of the following poles of the earth? The geographic north pole The geographic south pole The magnetic north pole The magnetic south pole 18. Matter can be found in which of the following forms? Gaseous Solid All of the above Liquid 19. The sensitivity of a multimeter is given in .... Ω None of the above amperes kΩ/V 20. If the crystal frequency changes with temperature, we say that crystal has ………….. temperature coefficient Positive Negative None of the above Zero 21. A substance with an excess of electrons is considered to be in what electrical state? Neutral Discharged Negative Positive 22. The resolution of an n bit DAC with a maximum input of 5 V is 5 mV. The value of n is ……. 10 11 9 8 23. A semiconductor has generally ……………… valence electrons. 6 2 4 3 24. A sensing device is also called transducer transistor sensor thermistor 25. An ideal regulated power supply is one which has voltage regulation of …… 5% 0% 10% 1% 1 out of 25 Time is Up! Time's up