MDCAT Physics Chapter 7 Light Online Test With Answers

MDCAT Physics Chapter 7 Light Online Test

Sr. # Questions Answers Choice
1 In a spectrometer experiment monochromatic light is incident normally on a diffraction grating having 4.5 x 105 lines per meter.The second order line is seen at an angle of 30 to the normal what is the wavelength of the light? 200 nm 430 nm 500 nm 556 nm
2 In young's slit experiment on interference the ratio of the intensities of a bright band and a dark band is 6 : 1 the ratio of the amplitudes o the interfering waves is 16 5/3 4 1/4
3 Signal from a remote control to the device operated by it travels with the speed of: Sound Light Ultrasonics Supersonics
4 When the light is incident on polarizing angle which of the following is completely polarized? Reflected light Refracted light Both reflected and refracted light Neither reflected nor refracted light
5 In the Young's double slit experiment the separation between the slits is halved and the distance between the slits and the screen is doubled the fringe width is Halved Unchanged Doubled Quadrupled
6 For the sustained interference of light the necessary condition is that the two sources should Have constant phase difference Be narrow Be close to each other Of same amplitude
7 If a source of light is moving away from stationary observer then frequency of light wave appears to change because of Doppler's effect Interference Diffraction None of the above
8 When seen in green light the saffron and green portions of our National Flag will appear to be Black Black and green respectively Green Green and yellow respectively
9 Ray optics is valid,when characteristic dimensions are Of the same order as the wavelength of light Much smaller than the wavelength of length Of the order of one millimeter Much larger than the wavelength or light
10 When light travels from one medium to another which are separated by a sharp boundary the characteristic which does not change is Velocity Wavelength Frequency Amplitude
11 Fraunhofer spectrum is a Line absorption spectrum Band absorption spectrum Line emission spectrum Band emission spectrum
12 The sky appears blue because Red light is absorbed Blue light is scattered the most Blue light is absorbed It is its natural color
13 Huygen's wave theory of light cannot explain Diffraction Interference Polarization Photoelectric effect
14 The contrast in the fringes in any interference pattern depends on Frings width Intensity ratio of the sources Distance between the slits Wavelength
15 Which one of the following phenomena is not explained by Huygen's construction of wavefront? Refraction Reflection Diffraction Origin of spectra
16 Light appears to travels in straight lines since It is not absorbed by the atmosphere It is reflected by the atmosphere Its wavelength is very small Its velocity is very large
17 The twinkling of stars is due to The fact that stars do not emit light continususly The refractive index of the earth's atmosphere fluctuate Intermittent absorption of star light by its own atmosphere None of these
18 A prism splits a beam of white light into its seven constituent colors.This is so because Phase of different colors is diferent Amplitude of different colors is different Energy of different colors is different Velocity of different colors if different
19 A sun rise or sun set the sun looks reddish because The sun is coldest at these times Of the effects of reflection and refraction The sun is hottest at these times Of the scattering of light
20 One cannot see through fog because Fog absorbs light The refractive index of fog is infinity Light suffers total reflection at the droplet in a fog Light is scattered by the droplets in fog
Download This Set

Is this page helpful?