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]
set 1
set 2
set 3
set 4
set 5
set 6
set 7
set 8
set 9
set 10
set 11
set 12
set 13
set 14
set 15
set 16
Question : 11
If a liquid is heated in condition of weightlessness, the heat is transmitted through
a) radiation
b) conduction
c) convection
d) None, because the liquid cannot be heated in weightlessness
Answer »Answer: (b)
Convection is not possible in weightlessness. So the liquid will be heated through conduction.
Question : 13
Consider the following statements :
- Bells are made of metal and not of wood because the sound is not conducted by metals but is radiated.
- The rate of transfer of energy in a wave depends directly on the square of the wave amplitude and square of the wave frequency.
a) 1 and 2 both
b) 1 only
c) 2 only
d) None
Answer »Answer: (c)
Metal is a good conductor of sound because it is solid and hence it has atoms are very near, this causes more vibration required for conducting sound.
Question : 15
Material A has a critical angle $i_A$, and material B has a critical angle $i_B$ ($i_B > i_A$). Then which of the following is true?
- Light can be totally internally reflected when it passes from B to A
- Light can be totally internally reflected when it passes from A to B
- Critical angle for total internal reflection is $i_B – i_A$
- Critical angle between A and B is $sin^{-1}({sini_A}/{sini_B})$
a) 2 and 3
b) 1 and 3
c) 1 and 4
d) 2 and 4
Answer »Answer: (d)
iB > iA or sin-1 $(1/{µ_B})$ > sin-1 $(1/{µ_A})$ or µA > µB
Hence medium A is denser and B is rarer.
Total internal Reflection: When the object is placed in an optically denser medium. and if the incident angle is greater than the critical angle then the ray of light gets reflected back to the originating medium.
For critical angle (α) from medium A to B, ${_Bµ_A}$
${_Bµ_A}$ = $1/{sin α}$ or sin α = $1/{_Bµ_A}$ = ${µ_B}/{µ_A}$
⇒ sin α = $1/{sin i_B}$ x ${sin i_A}/1$
⇒ α = sin-1 $[{sin i_A}/{sin i_B}]$
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set 9 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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» 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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» Biofertilizer
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» Biological Classification Cell Tissues And Division
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» Human Anatomy
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» Blood Transport System
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» Digestion And Excretion
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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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» Genetic Engineering And Bio Technology
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