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 : 3 [IAS (Pre) 2001]
Cloudy nights are warmer compared to clear cloudless nights, because clouds
a) Reflect back the heat given off by Earth
b) Produce heat and radiate it towards Earth
c) Prevent cold waves from the sky from descending on Earth
d) Absorb heat from the atmosphere and send it toward Earth
Answer »Answer: (a)
Question : 4
Triple point is the temperature at which
a) matter may simultaneously exist in solid and gaseous state.
b) matter may simultaneously exist in liquid and gaseous state.
c) matter may simultaneously exist in liquid and solid state.
d) matter may simultaneously exist in all the three forms.
Answer »Answer: (d)
Triple point is the temperature where three states of matter can exist simultaneously.
Question : 5
Consider the following statements:
- The sun looks red at sunset because most of the blue light in sunrays is scattered leaving behind red and yellow lights.
- Clouds look white because water droplets of clouds scatter all colours of light equally.
a) 1 and 2 both
b) 1 only
c) 2 only
d) None
Answer »Answer: (a)
According to the Raleigh scattering formula Scattering α$1/{λ^4}$
Short waves (violet) are scattered about ten times as the longer waves of red light. At sunrise and seen set, the sun’s rays have to pass through a larger distance in the atmosphere. Most of the blue and other shorter wavelengths are removed by scattering.
The least scattered light reaches our eye, therefore the sun looks reddish. Water droplets of clouds scatter all colours of light, thus object (cloud) appears white because all the colours recompose to give white light.
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set 10 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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