ECAT Pre General Science Chapter 9 online mcq test with answers for Physics chapter 9 (Physical Optics)

ECAT Pre General Science Physics Chapter 9 Physical Optics Online Test

Sr. #	Questions	Answers Choice
1	Light waves are:	Transverse wave Longitudinal wave Compressional wave None of them
2	Light has:	Wave nature Particle nature Dual nature None of these
3	In order to get interference using two light rays	The sources should be monochromatic and coherent The sources should have the same frequency Superposition should be linear All of these
4	The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called	Diffraction Interference Polarization Dispersion
5	The locus of all points in a medium having same phase of vibration is called	Crest Trough Wavelength Wave-front
6	According to Huygen's principle	light travels in straight line Light is a transvers wave Light has dual nature All points on the primary wave-front are the sources of secondary wavelets
7	The cause of mirage observed in deserts in bright sunlight is due to	Refraction of light Reflection of light Scattering of light Total internal reflection of light
8	The velocity of light in vacuum can be changed by changing	Frequency Amplitude Wavelength None of these
9	The image of the tip of a needle is never sharp because of	Polarization of light Interference of light Diffraction of light Reflection of light
10	Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?	Gamma rays, micro waves, visible light Radio waves, ultraviolet waves, X-rays Ultraviolet rays, infrared rays, micro waves Visible light, gamma rays, radio waves
11	Huygen's theory cannot explain	Diffraction Interference Polarization Photoelectric effect
12	The contrast in the fringes in an interference pattern depends upon	Fringe width Relative difference intensities of the two sources Distance between the slits Wavelength
13	If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity	Fringe width will decrease Fringe width will increase Fringe width will remain unchanged Fringe will become less intense
14	Which one of the following phenomenon cannot be explained on the bases of Huygen's theory	Refraction Reflection Diffraction Formation of spectrum
15	Light appears to travel in straight line because	It is not absorbed by the atmosphere It is refracted by the atmosphere Its wavelength is very small Its velocity is very large

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