Light Interview Questions with Answers
Question: 1. What Is Light ?
Answer:
It is some thing we see and use ordinary. Light is a form of energy. Light travels very rapid. Light now and again act as a wave, but not like sound waves or water waves, it is able to travel thru a vacuum.
Question: 2. What Is Difference Between Light Wave And Sound Wave ?
Answer:
Light can travel through a vacuum however sound cannot travel through a vacuum.
Sound Interview Questions
Question: three. Who First Suggested That The Light Is Neither Purely A Wave Nor Purely A Particle, But Has A Combination Of Both Properties ?
Answer:
Max Plank.
Question: four. What Are Light Waves ?
Answer:
The electromagnetic waves in nature are referred to as light waves .
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Question: 5. What Is Diffraction ?
Answer:
It is the bending or spreading of light around tiny opaque items.
Power Electronics Interview Questions
Question: 6. What Is The Velocity Of Light In A Vacuum ?
Answer:
three * 108
Question: 7. What Is Visible Light ?
Answer:
It is the narrowest group in the electromagnetic spectrum.
Physics Interview Questions
Question: 8. Who Discovered The Photoelectric Effect ?
Answer:
Heinrich Hertz
Question: nine. Who Put Forward The Theory Of Electromagnetic Radiation ?
Answer:
Max Well, whose idea become substantiated by way of Heinrich.
Thermodynamics Interview Questions
Question: 10. Which Is The Source Of Electromagnetic Waves ?
Answer:
The sun
Question: eleven. What Depends On The Intensity Of Light ?
Answer:
Amplitude
Dimensions Interview Questions
Question: 12. What Are Gamma Rays ?
Answer:
They are very pentrating. They convey masses of power and harm to living cells as they pass thru.
Sound Interview Questions
Question: 13. Who Proved That The Light Travels Faster Than Sound ?
Answer:
Olas Romer.
Question: 14. Which Gas Always Gives Out A Red Light ?
Answer:
Neon, exclusive gases produce distinctive coloured mild.
Question: 15. The Velocity Of Light Was First Measured By Whom ?
Answer:
Olas Romer.
Unit of Measurement Interview Questions
Question: 16. Colour Of Light Is Determined By?
Answer:
Frequency
Question: 17. Who First Invented Electric Light Bulb ?
Answer:
Thomas Alva Edison in 1879.
Machine Dynamics Interview Questions
Question: 18. The Objects Start To Go Dull Red At About?
Answer:
500 0C
Power Electronics Interview Questions
Question: 19. What Changes Electrical Energy Into Light Energy ?
Answer:
Light – emitting diodes ( LED )
Question: 20. Who First Explained How Light Is Reflected ?
Answer:
The dutch physicist Hendrik Lorentz used James Clerk Maxwell’s concept of electro – magnetic waves to provide an explanation for how mild is pondered.
Gravitational Interview Questions
Question: 21. What Is Used To Collect The Light From Distant Stars ?
Answer:
The optical telescopes.
Question: 22. What Is Refraction ?
Answer:
Light travels in directly lines. But whilst it passes from one transparent material to some other, the mild rays bend. This is known as refraction.
Question: 23. What Is Mirage ?
Answer:
When mild bends, it hints us into seeing matters within the incorrect vicinity. A mirage is because of light mirrored image within the atmosphere.
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Question: 24. What Are The Uses Of Laser Light ?
Answer:
They are utilized in eye surgical treatment, surveying, reducing metallic and so forth.
Physics Interview Questions
Question: 25. What Is Fluorescence ?
Answer:
Some chemicals absorbs extremely violet light and that launch power as visible mild. This is known as fluorescence.
Question: 26. How Are Shadows Formed ?
Answer:
Shadows are shaped because mild rays travel in instantly strains and can’t bend round opaque gadgets of their path.
Solar System Interview Questions
Question: 27. What Is Luminescence ?
Answer:
It is the emission of mild at low temperature. Fluorescence and phosphorescence are examples.
Thermodynamics Interview Questions
Question: 28. Which Is More Readily Seen At A Distance, A Plane Mirror Or A White Blotting Paper ?
Answer:
A white blotting paper. Because the floor of white blotting paper is more diffusive than a aircraft mirror, hence, it scatters mild in all guidelines.
Question: 29. Why Fluorescent Tube Light Is Considered Better Than Tungsten Filament Bulb ?
Answer:
Because, the efficiency of fluorescent tube is ready 50 lumen / watt and whereas the performance of electric bulb is set 12 lumen / watt. Thus for the equal amount of electric energy ate up, the tube offers almost 4 strength fed on, the tube offers almost four times extra mild than the filament bulb.
Question: 30. What Is Known As Coherent Sources ?
Answer:
Two light assets which produces seen interfernce patterns with steady force are called coherent sources.
Question: 31. What Happens To The Rest Of Energy In A Light Bulb Whose Efficiency Is So Low ?
Answer:
The rest of electricity is dissipated as warmth.
Question: 32. Why Are Parabolic Mirrors Used In Search Light And Not Concave Spherical ?
Answer:
Because a parabolic replicate is unfastened from round aberrations. So a source of mild placed at the focal point of parabolic mirror produces a parallel beam of light which easily seen even from an extended distance.
Question: 33. What Type Of Mirror Is Used By A Driver For Observing Traffic At The Back While Driving A Car Or Scooter And Why ?
Answer:
A convex reflect, as it gives a digital picture smaller a length and consequently wider view of visitors on the again.
Dimensions Interview Questions
Question: 34. A Man Holding Alighted Candle In Front Of A Thick Glass Mirror And Viewing It Obliquely Sees A Number Of Images Of The Candles. What Is The Origin Of This Multiple Images ?
Answer:
The the front surface of a tumbler ( thick ) is both reflecting and refracting. The starting place of these photographs is multiple reflection of light with within the glass by using the back and front surfaces.
Question: 35. A Concave Mirror And Convex Lens Are Kept In Water. What Changes, If Any, Do You Except In The Focal Length Of Either ?
Answer:
No change inside the focal period of the concave replicate. It is half of of its radius of curvature, no effect of outside medium.
Question: 36. A Ray Of Light Is Incident Normally On The Glass Slab. What Will Be The Angle Of Refraction ?
Answer:
The perspective of refraction s zero.
Unit of Measurement Interview Questions
Question: 37. The Surface Of The Sun Glasses Are Curved, Yet Their Power May Be Zero, Why ?
Answer:
Both the surfaces of sun glasses are curved however parallel to every other. Therefore R 1 = R1
Question: 38. Who First Demonstrated The Phenomenon Of Interference Of Light With Help Of Double Slit ?
Answer:
Thomas Young in 1801
Question: 39. Does The Apparent Depth Of A Tank Of Water Change If Viewed Obliquely ? If, So Does The Apparent Depth, Increase Or Decrease ?
Answer:
Yes, the apparent depth will increase, when water tank considered obliquely as compared to the intensity while visible close to generally.
Question: forty. A Lens When Immersed In A Transparent Liquid Is Not Visible. Under What Condition Can It Happens ?
Answer:
This can appear when refractive indices of two are same. Under such conditions the lens cloth does not reflect any light and isn’t always visible.
Machine Dynamics Interview Questions
Question: 41. How Are The Three Different Mirrors Used ?
Answer:
The aircraft reflect is used as operating glass. The concave replicate is used for shaving as it offers magnified picture of the face. The Doctors also use it to see the first-class details of ear, nose, throat, and so forth. The convex replicate is utilized in cars. The reflect gives short snap shots of the objects, for this reason enlarges the field of view.
Question: forty two. Why Does Red Cloth Appear Black Under Green Light ?
Answer:
The crimson cloth absorbs all mild except purple. Thus, while inexperienced mild falls upon purple cloth, it absorbs the greenlight and has not anything to reflect and hence, appears black.
Gravitational Interview Questions
Question: 43. Watching The Sunset On A Beach One Can See The Sun For Several Minutes After It Has Actually Set. Explain Why ?
Answer:
This is due to refraction of light.
Question: 44. How Would Blue Light Object Appear Under Sodium Lamp Light ?
Answer:
Light from a sodium lamp is yellow. A blue object absorbs yellow light falling on it from the lamp. Therefore object will seem black.
Question: forty five. What Is Newton’s Corpuscular Theory Of Light ?
Answer:
According to newton debris are emitted by means of a source of mild, and they journey in a straight line until the boundary of a new medium is encountered.
Question: 46. What Is The Nature Of Shaving Mirror ?
Answer:
Concave mirror.
Question: 47. What Is The Nature Of Mirror Used By Dentist To Observe The Cavity In The Tooth Of Patient ?
Answer:
Concave replicate
Question: forty eight. Which Feature Of Light Does Not Change When Light Goes From One Medium To Other ?
Answer:
Frequency
Question: 49. What Type Of Lens Like, Is An Air Bubble Inside Water ?
Answer:
Concave lens, considering water is denser than air.
Question: 50. A Bird Sees A Fish Inside A Pond Of Water. Is The Real Depth Of Fish More Or Less Than Apparent Depth ?
Answer:
Apparent depth of fish in step with chook is much less than the actual depth.
Question: 51. What Is Pure Spectrum ?
Answer:
A spectrum wherein there’s no overlapping of colours.
Question: 52. What Is Impure Spectrum ?
Answer:
A spectrum wherein one-of-a-kind colors overlap each other.
Question: 53. What Is Difference Between Spectroscope, Spectrograph And Spectrometer ?
Answer:
Spectroscope is used for simplest gazing a spectrum. In a spectrograph we will take photograph of the spectrum. In the a spectrometer, there is arrangement for making on measurements at the spectrum.
Question: fifty four. What Kind Of Spectrum Does A Candle Flame Give ?
Answer:
A continuous emission spectrum.
Question: 55. What Is The Essential Condition For Observing A Rainbow ?
Answer:
Back of observer must be closer to sun.
Question: fifty six. Why Do We Prefer A Magnifying Glass Of Smaller Focal Length ?
Answer:
Because magnifying electricity is extra when focal period is short.
Question: fifty seven. Objective Of A Compound Microscope Should Have A Small Focal Length. Why ?
Answer:
To have large magnifying strength.
Question: fifty eight. What Is The Sequuence Of Colours Observed In A Primary Rainbow ?
Answer:
Inner edges violet and outer edges is pink ( VIBGYOR )
Question: fifty nine. What Angle Does The Radius Of Secondary Rainbow Subtend At The Observer’s Eye ?
Answer:
52 0
Question: 60. What Is Total Internal Reflection ?
Answer:
Let light be going from a denser to a rarer medium. If angle to occurrence is more than the important perspective of incidence no light is refracted into the medium. The whole of light is contemplated again into the first medium.
Question: 61. Which Are The Two Conditions For Total Internal Reflection ?
Answer:
Light have to cross from a denser to rare medium
The angle of prevalence need to be more than critical angle of incidence.
Question: sixty two. Vechicles Moving In “ Foggy ” Weather Use Yellow Coloured Headlights. Why ?
Answer:
In foggy weather scattering of mild is large, becausse extra scatters are gift inside the air. Wavelength of yellow mild is huge and severe yellow source are smooth to produce. The yellow light will not undergo huge scattering and could be observable from a protracted distance.
Question: 63. What Is Doppler Effect In Light ?
Answer:
There is a change within the frequency of mild radiation while the supply or the observer move with appreciate to each other. This phenomenon is called doppler impact.
Question: sixty four. What Is Shark Effect ?
Answer:
The wavelength of mild emitted by way of atoms is changed with the aid of the software of as sturdy transverse electric discipline to the supply, the spectrum traces are split up into some of sharply described components. They are symmetrical approximately the position of the undisplaced line, and are proportional line, and are proportional to the sphere strength as much as about 100,000 volts consistent with cm.