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Physics

Physics
Minimum number of unequal vectors which can give zero resultant are

more than four
two
three
four

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Physics
Red light is used for signals because it has

Long wavelength
High frequency
Low refraction in the medium
High intensity

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Physics
Find the current (in A) when a charge of 500 Coulomb flows in 25 seconds.

6250
12500
20
40

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Physics
The wave like properties of electrons are useful in

All of these
Weather reports
Lasers
Magnifying objects

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Physics
In mirrors the back surface is coated with a thin layer of :

Red oxide
Mercury
Silver nitrate
Silver

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Physics
A circular plate, a cube and a sphere, all made up of same material and having the samemass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?

Sphere
All will cool at the same rate
Cube
Circular plate

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