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]
set 1
set 2
set 3
set 4
set 5
Question : 17
A coin is placed on a rotating disc and is stationary w.r.t. the disc, then the direction of friction is
a) towards the centre of the disc
b) opposite to the direction of motion of the coin w.r.t. ground
c) along the direction of motion of the coin w.r.t. ground
d) away from the centre of the disc
Answer »Answer: (a)
Friction provides centripetal force to the coin, hence acts towards the centre of the disc.
Question : 18
If a running boy jumps on a rotating table, which of the following is conserved?
a) Angular momentum
b) K.E
c) Linear momentum
d) None of these
Answer »Answer: (a)
The boy does not exert a torque to rotating table by jumping, so angular momentum is conserved i.e., ${d{L}↖{→}}/{dt} = 0 ⇒ L ↖{→} $ = constant.
Question : 20
A composite disc is to be made using equal masses of aluminium and iron so that it has as high a moment of inertia as possible. This is possible when
a) the whole of the iron is kept in the core and the aluminium at the outer rim of the disc
b) the whole of aluminium is kept in the core and the iron at the outer rim of the disc
c) the surfaces of the disc are made of iron with aluminium inside
d) the whole disc is made with thin alternate sheets of iron and aluminium
Answer »Answer: (b)
IMPORTANT general science mcq EXERCISES
set 4 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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