Please select a subject first
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Nita heard the sound of lightning after 4 seconds of seeing it. What was the distance of the lightning from her?
(The velocity of sound in air is 340 m/s.)
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Sunil is standing between two walls. The wall closest to him is at a distance of 660 m. If he shouts, he hears the first echo after 4 s and another after another 2 seconds.
- What is the velocity of sound in air?
- What is the distance between the two walls?
Concept: undefined >> undefined
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Hydrogen gas is filled in two identical bottles, A and B, at the same temperature. The mass of hydrogen in the two bottles is 12 gm and 48 gm respectively. In which bottle will sound travel faster? How many times be as fast as the other?
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Helium gas is filled in two identical bottles A and B. The mass of the gas in the two bottles is 10 gm and 40 gm respectively. If the speed of sound is the same in both bottles, what conclusions will you draw?
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Write the uses of diamond.
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Write two physical properties.
Diamond
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Which type of mirror is used in the following?
Periscope
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Write the name of microbes found in the following food material.
Bread
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Write the name of microbes found in the following food material.
Root nodules of leguminous plants
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Write the name of microbes found in the following food material.
idli
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Write the name of microbes found in the following food material.
Dosa
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Write the name of microbes found in the following food material.
Spoiled potato curry
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Which type of mirror is used in the following?
Kaleidoscope
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Clarify the difference.
Uniform and non-uniform motion.
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Give scientific reasons.
The velocity of an object at rest is considered to be uniform.
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Explain the need for a reference atom for atomic mass. Give some information about two reference atoms.
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What is meant by Unified Atomic Mass?
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Correct and rewrite the following statement and justify your correction.
Carnivores occupy the second trophic level in the food chain.
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Give reason.
Energy flow through an ecosystem is ‘one way’.
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Explain the following with suitable examples.
What type of changes occur in the amount of energy during its transfer from plants to apex consumers?
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