Science Quiz / 'U' in Natural Sciences

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Answers to these Natural Sciences questions start with a 'U'

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HintAnswer
Sound pressure wave with frequency above the upper limit of the human hearing range
Dense silvery-white radioactive metal used as a fuel in nuclear reactors
Main nitrogenous breakdown product of protein metabolism, excreted in urine
Sore on the skin or a mucous membrane, accompanied by disintegration of tissue
Principle that more accuracy for momentum of a particle means less accuracy for position
Area of total darkness in the shadow cast by the Moon or other body during an eclipse
Combination of all the elements of two or more sets into one set
Structure that connects the placenta and the embryo in placental mammals
Solution in which more solute can be dissolved at a given temperature
Uncontrolled spread of urban development into neighboring regions
HintAnswer
All of spacetime and everything that exists therein regarded as a whole
A circle with a radius of 1
Radiation with a wavelength shorter than visible light but longer than X-rays
Population shift from rural to urban areas
Constellation containing the Big Dipper
Process in which deep, cold water rises toward the surface
Mountain range in western Russia forming the boundary between Europe and Asia
A variable whose value is to be discovered by solving an equation
A game in which a certain player can always win when he plays properly
A value that is greater than or equal to all other values in the set

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