Physics MCQs

Page No. 10

Electron cannot exist in the nucleus it is confirmed by observing that______________?


aIt does emit radiation

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bIts size as compare to proton and neutron is very small

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cNo antiparticle of electron is present

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dThe velocity of electron must be very high according to uncertainty principle

✓



Wave-like characteristic of electron is demonstrated by______________?


a Line spectrum of atoms

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bProduction of x-rays.

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cDiffraction by crystalline solids

✓


dPhotoelectric effect

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UV radiation can be produced by______________?


a Heating the filament

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bElectron excitation in the gas

✓


cIonization of atoms

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dAll the above

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X-rays are diffracted by a crystal but not by a diffraction grating because_____________?


aThe ions in a crystal are well arranged

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bThe lines in a diffraction grating cannot reflect X-rays.

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cThe penetration power of X-rays is high in a diffraction grating

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dhe penetration power of X-rays is high in a diffraction grating D. The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal

✓



Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?


ae______________? 0 A. Number of incident electron i.e. filament current

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bThe kinetic energy of the incident electron i.e. the potential difference through which they are accelerated

✓


cThe soft target which can easily emit electrons

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dAll of above are correct

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The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?


a6.2 x 10-10m

✓


b9.1 x 10-18m

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c3.11 x 10-10m

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d 4 x 10-10m

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View Answer 6.2 x 10-10m

The characteristic X-rays spectrum is due to_____________?


aThe illumination of the target metal by ultra-violet radiation

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bThe bombardment of the target by protons

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cThe bombardment of target by electrons

✓


dThe absorption of radiation by the target metal

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The minimum wavelength of X-rays can further be reduced by _______________?


aReducing the pressure or cooling the target

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bIncreasing the temperature of the filament.

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cUsing a target element of higher atomic number

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dIncreasing the potential difference between the cathode and the target

✓



Radiation produced from TV picture tube is_____________?


aB-rays

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bX-rays

✓


cFar infrared

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dInfrared

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View Answer X-rays

In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?


ahe/ev

✓


bhe/Vc

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ceV/h

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dimpossible to predict

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View Answer he/ev

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