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Physics

Physics
What is the minimum distance (in metres) required to hear an echo?

13
17
10
21

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Physics
The Capacity of a communication channel is measured in

Band width
Data flow
Bit capacity
Band rate

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Physics
What is the reason for twinkling of stars ?

Atmospheric reflection
Dispersion of light
Atmospheric refraction
Total internal reflection

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Physics
The colours of stars depend on their

Atmospheric pressure
Temperature
Radius
Distance

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Physics
If ice floating on water in a vessel melts, the water level in the vessel ________ .

Decreases
Increases
Does not change
First increases before decreasing

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Physics
It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because

Centre of gravity and centre of equilibrium fall within the feet
Weights of buckets are balanced
Centre of gravity falls within the body
Resultant weight of buckets is zero

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