Process Control and Instrumentation
A bolometer is

Neither A nor B Here
Used for the measurement of thermal radiation
An element which senses optical input and delivers thermal output
Both A & B Here

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Process Control and Instrumentation
Thermodynamic celcius scale of temperature measurement is

Having an interval of 100° between ice point to steam point
Both A&B Here
Defined on the basis of melting point of ice and evaporation temperature of water vapor
Having an interval of 100° between ice point to steam point

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