Mechanics (mass, Force, Acceleration, Work, Energy, Momentum, Velocity) - Category Wise Question And Answer Practice Test With Solutions
MECHANICS (MASS, FORCE, ACCELERATION, WORK, ENERGY, MOMENTUM, VELOCITY) PRACTICE TEST [5 - EXERCISES]
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Question : 6
A balloon filled with CO2 released on earth would (neglect viscosity of air)
a) fall with a constant acceleration 3.4 m/s2
b) fall with an acceleration 9.8 m/s2
c) climb with an acceleration 9.8 m/s2
d) fall with acceleration and then would attain a constant velocity
Answer »Answer: (a)
If B is upthrust of air on balloon, and a is downward acceleration, then
Mg – B = Ma
⇒ a = ${Mg - B}/M = g- {{Vρ}_{air}g}/{{Vρ}_{CO_2}}$
=$(1-{{Vρ}_{air}}/{{Vρ}_{CO_2}})g = (1-{28.8}/{44})×9.8m/{s}^2$
=3.4m/${s}^2$
IMPORTANT GENERAL SCIENCE MCQ EXERCISES
set 2 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