Physics ICS Part 2 Online MCQ's Test With Answers

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Physics ICS Part 2 Online MCQ's Test

Sr. # Questions Answers Choice
1 The Balmer series is obtained when all the transition of electrons terminate on 1<sup>st</sup> orbit 2nd orbit 3rd orbit 4th orbit
2 For an atom of hydrogen atom the radius of the first orbit is given by: H/me<sup>2</sup> me/4h<sup>2</sup> h2/4<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">π<sup>2</sup> kme<sup style="">2</sup></span> h<sup>2</sup> me<sup>2</sup>
3 If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is: 10.2 eV 0 eV 3.4 eV 6.8 eV
4 An electron miroscope emplys which to one of the following particles? Electron ahve a wave nature Electrons can be focused by an electric field Electrons can be focused by a magnetic field All of the above
5 We can never accurately describes all aspects of sbatomic particles simulatanously. It is correct according to: Uncertainity Priciple De-broglie Theory Einstin Theory Photo electric effect
6 The position has charge which is in magnitude equal to the charge on Electron Proton <span style="font-weight: bold; color: rgb(106, 106, 106); font-family: arial, sans-serif; font-size: small;">β particle</span> All
7 Pair production cannto take place in vacuum because : Mass in not conserved Momentum is not conserved Energy is not conserved Charge is not conserved
8 Pair production occurs only when energy of photon is at least equal in: 1.02keV 1.02 eV 1.02 MeV 1.02 GeV
9 A perfect absorber must also be perfect Cavity Sources of radiation Radiator None of these
10 De-Broglie waves are associated with Moving charged particles only Moving neutral particles only All moving particles All parties whether in motion or at rest
11 Eintein's Photoelectric equation is Ek= hf -∅ in this equation E1, refers to: K.E of al the emited electrons Mean K.E of emited electrons Maximum K.E of emited electrons Minimum K.E of emited electrons
12 If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor. <b style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">√</b><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">2</span> 1/<b style="font-family: arial, sans-serif; font-size: 16px; color: rgb(34, 34, 34);">√</b><span style="font-family: arial, sans-serif; font-size: 16px; color: rgb(34, 34, 34);">2</span> 2 1/2
13 In a transistor, collector current is controlled by: Collector voltage Base current Collector resistance All of the above
14 In a transistor, collector current is controlled by: Collector voltage Base current Collector resistance All of the above
15 Most of the electrons in the base of an NPN transistor flow: Out of the base lead Into the collector Into the emit Into the base supply
16 When transistor are used in digital circuits they usually operate in the : Active region Break down region Saturation &amp; cutoff regions Linear region
17 Improper bisting of a transistor circiut produces: Heavy loading of emitter current Distortion in the output output signal Excessive heat at collector terminal Faculty location of load line
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