light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions
light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]
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Question : 23
When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of
a) diffraction and transmission
b) reflection and diffraction
c) reflection and transmission
d) refraction, diffraction and transmission
Answer »Answer: (d)
The reason CDs reflect rainbow colours is because they have a clear plastic coating on top of a mirrored surface.
Light refracts (bends) when it moves from one medium (such as air) to another with a different optical density (such as the clear plastic surface of a CD).
Different wavelengths of light (every colour has a different wavelength) travel at different speeds so that the full spectrum appears when white light passes from the air through the plastic surface of a CD, separating light rays which are then reflected back to us by the mirrored centre surface of a CD.
Here the diffraction and transmission also take place because diffraction of light rays occurs when it strikes the surface of CD and transmission is obvious when light enters from one medium to another.
The thickness of the different optical media, angle of source light, and brightness of source light all affect which rainbow patterns are visible on a CD.
Question : 25 [UPPCS (Mains) 2013]
An astronaut cannot hear his companion at the surface of the Moon because
a) Temperature is too low during night and too high during day
b) There is no medium for sound propagation
c) Produced frequencies are above the audio frequency
d) There are many craters on the surface of the Moon
Answer »Answer: (b)
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Click to Start..general science mcq CATEGORIES
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» Measurement And SI Units
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» Measuring Devices And Scales
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» Mechanics (Mass, Force, Acceleration, Work, Energy, Momentum, Velocity)
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» Force Of Gravity, Solids And Fluids
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» Motion Under Gravity
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» Physical Properties Of Materials
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» Light, Heat, Thermodynamics, Wave Motion, Sound, Optics & Oscillations
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» Electric Current And Magnetism
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» Nuclear Physics And Conductivity
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» Modern And Space Physics, Sources Of Energy
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» General Concepts Of Chemistry
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» Nature Of Matter And Composition
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» Atomic Structure Molecules And Nuclear Chemistry
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» Classification Of Elements, Chemical Bonding, Periodicity In Properties & Physical Transformation
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» Metals, Non Metals, Minerals, Ores, Properties, Uses
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» Alloys, Carbon & Its Various Forms, Hydrogen & Compounds, Sulphur, Nitrogen, Halogen & Inert Gases
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» Acids, Bases, Salts And Metals
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» Hydrocarbon, Alcohol, Polymer, Organic Acid And Explosive Substance
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» Fuel, Food Preservation, Nutrition, Medicine, Detergents And Fertilizers
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» Inorganic Chemistry
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» Organic Chemistry
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» Environmental Chemistry
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» Some Important Man Made Materials
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» Sub Divisions Of Biology
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» Genetics, Evolution Of Life & Ecological Biodiversity
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» Taxonomy
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» Heredity
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» Photosynthesis
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» Vitamins, Nutrition, Health, Disease And Treatment
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» Endocrine Glands, Hormones
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» Physiology Of Plants, Humans And Animals
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» Reproduction
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