Maximum allowable concentration of CO2 in air for safe working is ________ ppm (parts per million)?

Plasma is________?

________ is a natural fiber?

Separation of isotopes is generally done using a/an ________ centrifuge?

Solutions which distil without change in composition are called________?

On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the ________ of the input signal?