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 : 24
A solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperture 120°C , then
a) the sphere cools down faster than the cube
b) both the cube and the sphere cool down at the same rate
c) the cube cools down faster than the sphere
d) whichever is having more mass will cool down faster
Answer »Answer: (c)
Rate of cooling of a body R = ${Δϴ}/t = {Aɛσ(T^4 - {T_O}^4)}/{mc}$
⇒ $R ∝ A/m ∝ \text"Area"/\text"Volume"[m = ρ×V]$
⇒ For the same surface area. $R ∝ 1/\text"Volume"$
Since Volume of cube < Volume of a sphere
⇒ $R_{cube} > R_{Sphere}$
i.e., the cube cools down at a faster rate.
Question : 25
At a given temperature the internal energy of a substance
a) in liquid state is more than that in gaseous state
b) in liquid state is equal to that in gaseous state
c) in liquid state is less than that in gaseous state
d) is equal for the three states of matter
Answer »Answer: (c)
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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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