Physics
Danger signals are generally red as red light

Undergoes least deviation
Gives comfort to eye
Is least bright
Has lowest velocity

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Physics
Which one of the following is the correct sequence of passage of light in a compound microscope?

Eyepiece -Objective lens -Body tube -Mirror
Condenser -Objective lens -Eye -piece -Body tube
Condenser -Objective lens -Body tube -Eyepiece
Objective lens -Condenser -Body tube -Eye piece

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Physics
A balloon filled with hydrogen will

Reach a particular height and remain floating
Continue going upwards uninterrupted
Reach a particular height and start coming down
Burst after reaching some height

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Physics
Stars twinkle because

None of these
the intensity of light emitted by them changes with time.
the distance of the stars from the earth changes with time.
the refractive index of the different layers of the earth's atmosphere ch

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

The density of salt solution exceeds the density of eggs
Egg absorbs salt from the solution and expands
Water has high surface tension
Albumin dissolves in salt solution and egg becomes lighter

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