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Physics

Physics
The surface tension of water on adding detergent to it

Becomes zero
No change
Decreases
Increases

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Physics
Vehicles use ________ to see the objects coming from behind.

Convex mirror
Concave mirror
Concave lens
Convex lens

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Physics
The ordinary and maximum tolerance limit of sound by human being is

50 db to 70 db (decibel)
65 db to 75 db (decibel)
70 db to 85 db (decibel)
60 db to 80 db (decibel)

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Physics
Golden view of sea shell is due to

Diffraction
Polarization
Reflection
Dispersion

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Physics
Radio telescopes are better than optical telescopes because

they can detect faint galaxies which no optical telescope can
All of these
they can work during the day and night
they can work even in cloudy conditions

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Physics
In case of uniform circular motion, the acceleration is

Constant in magnitude and directed radially inwards
Zero
Variable in magnitude but constant in direction
Variable in magnitude but tangential to the circle

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