Physics Measuring Instruments

Lichenometry is a technique used to determine the age of exposed rock surfaces based on the size of lichen thalli. 

A seismometer is the scientific instrument used to detect and record the intensity, direction, and duration of seismic waves from earthquakes or explosions. Barometers measure air pressure, hydrometers measure liquid density, and altimeters measure altitude.

Bolometer is a temperature transducer used for the measurement of minute quantities of radiant heat.

An apparatus for use in exposing visual stimuli, as pictures, letters, or words, for an extremely brief period, used chiefly to assess visual perception or to increase reading speed.

Psychrometer is an apparatus to measure both relative humidity and transpiration.

An electric current is a flow of electric charge. Electric charge flows when there is voltage present across a conductor.

A device whose resistance to electric current depends on the position of some mechanical element or control in the device.

An electric current is a flow of electric charge. Voltage is electric potential energy per unit charge. Resistance is a property of a conductor due to which it opposes the flow of current through it.

Hydrometer is an instrument used to measure the relative density of a liquid.

A hygrometer is specifically designed to measure relative humidity - the amount of moisture in air compared to the maximum it can hold at that temperature. A maximum-minimum thermometer measures temperature extremes. A rain gauge measures rainfall amount. A stethoscope is a medical instrument for listening to heart/lung sounds.

A hygrometer is specifically designed to measure the relative humidity of air - the amount of moisture present compared to the maximum possible at that temperature. Maximum-minimum thermometer measures temperature range. Rain gauge measures rainfall. Stethoscope is a medical instrument for listening to body sounds. Hygrometers are essential weather instruments and are also used indoors to monitor humidity levels for comfort and health.

Statement (1) is wrong. Ammeter is an instrument used to measure the electric current.

A thermostat is a temperature-regulating device that maintains a system at a desired temperature by automatically switching heating or cooling equipment on and off. It works by sensing the current temperature and comparing it to a setpoint, then activating or deactivating equipment to maintain the target temperature level.

A thermometer is the specific device designed for measuring temperature. Manometers measure pressure, hydrometers measure liquid density, and barometers measure atmospheric pressure. Thermometers work on principles like thermal expansion of liquids (mercury, alcohol) or electrical resistance changes.

Calorimeter is an instrument, used to measure the heat evolved in a process. The principle behind this instrument is, Heat lost = Heat gained.