Physics
Which of the following represents a relation for ''heat lost = heat gained'?

Principle of calorimetry
Principle of colors
Principle of thermal equilibrium
Principle of vaporization

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Physics
X-rays region lies between

Gamma-rays and ultraviolet region
Ultraviolet and visible region
Short radio waves and long radio waves
Visible and infra-red region

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Physics
Pressure Cooker cooks faster because

Higher temperature is attained for cooking
The material of the cooker is a good conductor
It cooks the food at low pressure
Boiling point decreases with rise of pressure

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