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Physics

Physics
Red light has a wavelength of 70 A°. In "nm" it is

70 nm
700 nm
7 nm
0.07 nm

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Physics
The first law of thermodynamics is simply the case of

The law of heat exchange
Charle's law
Newton's law of cooling
The law of conservation of energy

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Physics
If a body moves with a constant speed in a circle

No force acts on it
No work is done on it
Its velocity remains constant
No acceleration is produced in it

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Physics
Which one of the following is a non-dimensional quantity?

Plank's constant
Strain
Co-efficient of viscocity
Gas constant

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Physics
Which of the following principle is used to produce ''low-temperatures' ?

Adiabatic demagnetisation
Joule-Kelvin effect
Thermo-electric effect
Super conductivity

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Physics
A boat will submerge when it displaces water equal to its own:

Surface area
Volume
Weight
Density

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