ESS
Grade-8
Easy
Question
Coal is a __________.
- Renewable resource
- Non-renewable resource
- Artificial resource
- Non- usable resource
Hint:
Coal is a non-renewable natural resource.
The correct answer is: Non-renewable resource
- Coal is formed from layers of plant existent particles and rock-covered plants around million years ago.
- Coal has the energy of the plants that lived millions of years ago in swampy forests.
- They take many years to form and are non-renewable resources.
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The basic needs of human being are________________.
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Rarefactions are the regions where the ____ is low.
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The particles of the medium do not actually move to carry the sound wave from one place to another. They simply vibrate about their equilibrium positions. This statement is ____.
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Propagation of sound can be visualized as the propagation of ____ variations.
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In the options given below, if ‘C’ means compression and ‘R’ means rarefaction figure out which of the patterns represent the pattern of particles of the medium through which sound propagates.
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PhysicsGrade-8
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The particles of the medium move from the origin of sound to the destination to carry it. This statement is ____.
The particles of the medium move from the origin of sound to the destination to carry it. This statement is ____.
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Sound waves are produced from an object which ____.
Sound waves are produced from an object which ____.
PhysicsGrade-8
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Each vibration creates __ compressions and ___ rarefactions.
Each vibration creates __ compressions and ___ rarefactions.
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Sound waves are ________ waves.
Sound waves are ________ waves.
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