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 : 6
Timbre is called the quality of sound. One can recognise the voice of a familiar human being or instrument without actually seeing them. This quality is associated with
a) overtones present in the sound
b) material of the body
c) shape of the body
d) all of the above
Answer »Answer: (d)
Question : 7
At a common temperature, a block of wood and a block of metal feel equally cold or hot. The temperatures of block and wood are
a) greater than temperature of the body
b) equal to the temperature of the body
c) less than the temperature of the body
d) either (b) or (c)
Answer »Answer: (b)
The temperatures of the block and wood are equal to the temperature of the body as both feel equally hot or cold.
Question : 9
5g ice at 0ºC is mixed with 5g of steam at 100ºC . What is the final temperature?
a) 80ºC
b) 50ºC
c) 100ºC
d) 150ºC
Answer »Answer: (c)
Heat required by ice to raise its temperature to 100°C,
$Q_1 = m_1L_1 + m_1c_ 1Δϴ_1$ = 5 × 80 + 5 × 1 × 100 = 400 + 500 = 900 cal.
Heat given by steam when condensed,
$Q_2 = m_2L_2$ = 5 × 536 = 2680 cal as $Q_2 > Q_1$.
This means that whole steam is not even condensed.
Hence temperature of mixture will remain at 100°C.
Question : 10
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, separated 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.
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set 15 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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