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Physics

Physics
Permissible noise level at Residential area during night time is :

45 dB (A)
75 dB (A)
55 dB (A)
80 dB (A)

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Physics
Lamberts law is related to

Illumination
Interference
Refraction
Reflection

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Physics
Heat flows as a result of difference of ________

Temperature
Volume
Density
Mass

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Physics
The word ''insolation' means

Insoluble matters
Matters which insulate
Incoming solar radiation
None of these

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Physics
At what temperature (in Fahrenheit) pure water freezes?

48
32
37

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Physics
A small gap is left at the joints of rails in a railway track to

Avoid the heating of tracks to high temperature
Avoid the tracks being distorted due to seasonal temperature variation
Keep the rails equidistant
Control the speed of train

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