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 : 16
The reflection of sound is called echo. Which of the following conditions is/ are necessary for the formation of echo?
- The minimum distance between the source of sound and the reflecting body should be 17 m.
- The wavelength of sound should be less than the height of the reflecting body.
a) 1 and 2 both
b) 1 only
c) 2 only
d) None
Answer »Answer: (a)
The minimum distance between source and reflector of sound is given by,
ddim= $vt/2$
Question : 19
Consider the following statements:
- If magenta and yellow coloured circles intersect, the intersected area will have red colour.
- If cyan and magenta coloured circles intersect, the intersected area will have blue colour.
a) 1 and 2 both
b) 1 only
c) 2 only
d) None
Answer »Answer: (a)
A combination of red and blue colours results in the formation of magenta colour.
Where a combination of red and green colour results in the formation of yellow colour.
Thus on a combination of magenta and yellow colour red colour will be highlighted.
On the other side combination of blue and green results in the formation of cyan colour.
A combination of red and blue colours produces a magenta colour.
Therefore, on a combination of cyan and magenta colours, the blue colour will be more highlighted.
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set 16 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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» Human Anatomy
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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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