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 2
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set 13
set 14
set 15
set 16
Question : 1 [IAS (Pre) 1993]
Consider the figures of a metal ball and a metal ring given below. The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated
a) The ball gets stuck because of the diameter of the hole decrease on expansion
b) The ball will still pass through because the hole diameter does not change
c) The ball can still pass through the ring as diameter expands on heating
d) The ball will pass through because there is no change in the ring
Answer »Answer: (c)
Question : 2
Some common mediums in which the speed of sound waves is measured are mentioned below?
- Air
- Steel
- Copper
- Water
a) 1 < 4 < 3 < 2
b) 1 < 4 < 2 < 3
c) 4 < 1 < 2 < 3
d) 4 < 1 < 3 < 2
Answer »Answer: (a)
The speed of sound is maximum in solids
Vsolid > Vliquid > Vgas.
Steel is more elastic than copper, hence the speed of sound is greater in steel than in copper.
Question : 4
Which of the following statements is correct ?
a) Frequency of ultrasonic waves is of the same order as that of X-rays
b) Ultrasonic waves can travel in vacuum
c) Wavelength of ultrasonic waves is of the same order as that of microwaves
d) Speed of ultrasonic waves is of the same order as that of light
Answer »Answer: (a)
Question : 5
What is the effect of humidity on sound waves when humidity increases?
a) Speed of sound waves remains same
b) Speed of sound waves is more
c) Speed of sound waves is less
d) Speed of sound waves becomes zero
Answer »Answer: (b)
The velocity of sound = $√{γRT}/M$
When water vapour is present in air average molecular weight of air decreases and hence velocity increases.
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set 6 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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