Name the principle used in the mercury thermometer.

Name the organism Englemann used in his experiment.

Name the' principle of which nuclear reactor works.

Name the principle on which an optical fibre works.

Explain the principle on which the metal detector is used in airport for security reason works.

Name the reagent used to detect sugar in the urine.

A constnat volume gas thermometer shows pressure reading of 50 cm and 90 cm of merucry at 0^@C and 100^@C respecetively. When the pressure reading is 60 cm of mercury the temperature is

Name the gas commonly used in refrigerators.