Physics MCQs

Page No. 11

Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?


aA & B


b B & C


cA & C


dA B & C


View Answer B & C

When X-rays are passed through successive aluminum sheets what happens to their thickness ?


aincreases


b it decreases


c it remains same


dsometimes increases and sometimes decreases


View Answer it remains same

X-rays are similar in nature to_______________?


aCathode rays


bPositive rays


cγ-rays


dBeta rays


View Answer γ-rays

In an electronic transition atom cannot emit______________?


a γ-rays


bInfra red radiation


cVisible light


dUltraviolet rays


View Answer γ-rays

Radiation with wavelength longer than red lights______________?


aultraviolet rays


b X-rays


c infra red radiation


dvisible radiation



Reverse process of photoelectric effect is_______________?


apair production


bCompton effect


cannihilation of matter


dX-rays production


View Answer X-rays production

The penetrating power of X-rays depends on their______________?


aapplied voltage


b frequency


csource


dall of the above


View Answer frequency

Bracket series is obtained when all transition of electron terminate on_______________?


a4th orbit


b5th orbit


c3rd orbit


d2nd orbit


View Answer 4th orbit

The electric P.E of an electron in an orbit at a distance rn from the positive charge_____________?


aKe2/rn


bKe2/rn2


cÀKe2/rn


dÀKe2/rn2


View Answer ÀKe2/rn

Ground state energy of the 4th orbit in a H-atom is_____________?


a13.60 eV


b3.40 eV


c0.85 eV


d 1.51 eV


View Answer 0.85 eV

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