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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set 16
Question : 7 [NDA]
Bats can ascertain distance, directions, nature and size of the obstacles at night. This is possible by reflection of the emitted
a) ultrasonic waves from the distant objects
b) ultrasonic waves from the bat
c) supersonic waves from the bat
d) supersonic waves from the distant objects
Answer »Answer: (b)
Question : 9
Total internal reflection can take place only if
a) the refractive indices of the two media are close to different
b) light goes from optically rarer medium to optically denser medium
c) light goes from optically denser medium to rarer medium
d) the refractive indices of the two media are widely different
Answer »Answer: (c)
According to Snell’s Law,
${sin i}/{sin r} = µ_2/µ_1$
where r = 90° for a particular incidence angle called the critical angle. When the incidence angle is equal to or greater than ic, then total internal reflection occurs.
It takes place when a ray of light travels from an optically denser medium ($µ_1 > µ2$) to an optically rarer medium.
Question : 10
Consider telecommunication through optical fibres. Which of the following statements is not true ?
a) Optical fibres may have homogeneous core with a suitable cladding
b) Optical fibres are subject to electromagnetic interference from outside
c) Optical fibres have extremely low transmission loss
d) Optical fibres can be of graded refractive index
Answer »Answer: (b)
Optical fibres are free from electromagnetic interference from outside.
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set 14 Online Quiz
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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» Some Important Man Made Materials
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» Taxonomy
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» Endocrine Glands, Hormones
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» Physiology Of Plants, Humans And Animals
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