Physics Measuring Instruments

An autoscope is a medical instrument designed for self-examination, particularly in gynecology, allowing a person to view their own internal organs. The prefix 'auto-' means 'self,' which aligns with this function of self-examination.

A helioscope is an instrument specifically designed for viewing the sun without causing eye injury. The prefix 'helio-' refers to the sun. This instrument allows safe solar observation by filtering or projecting the sun's image.

A seismoscope is an instrument that detects and records the occurrence and timing of earthquakes. The prefix 'seismo-' refers to earthquakes or seismic activity. Unlike a seismograph which records the intensity, a seismoscope primarily indicates when an earthquake occurred.

A stethoscope is a medical instrument used by doctors to listen to internal sounds of the body, primarily the heart and lungs (breathing). The correct answer combines both functions as doctors use it to assess both cardiac and respiratory sounds during physical examinations. Options A and B are incomplete as they mention only one function each.

A hygrometer measures humidity (water vapor content in air). A thermometer measures temperature, a barometer measures atmospheric pressure, and a hydrometer measures liquid density (not to be confused with hygrometer).

Earthquake intensity is measured with a seismograph (not listed). Thermometers measure temperature, barometers measure air pressure, hydrometers measure liquid density. So 'None' is correct.

A lactometer is specifically designed to measure the density and purity of milk by checking its specific gravity. Barometers measure atmospheric pressure, thermometers measure temperature, and alcoholometers measure alcohol concentration in liquids.

A barometer measures atmospheric air pressure. Sphygmomanometers measure blood pressure, hydrometers measure liquid density, and airometers (if referring to air flow) measure flow rate not pressure.

A thermometer is the instrument specifically designed to measure temperature, including human body temperature. The other options are either non-existent (temptometer) or measure completely different physical quantities.

A variometer measures vertical speed - rate of climb or descent. It's alternatively called Vertical Speed Indicator (VSI) or Rate of Climb indicator. It shows whether aircraft is climbing or descending and how quickly. Option A is correct.

A voltmeter is specifically designed to measure electrical potential difference (voltage) between two points in a circuit. Galvanometer detects current, ammeter measures current, and ohmmeter measures resistance.

An ammeter is the instrument used to measure electric current flowing through a circuit. It is connected in series with the circuit element whose current is to be measured.

An ohmmeter measures electrical resistance. Ohm's law states that resistance equals voltage divided by current, and ohmmeters are designed to measure this property directly.

A galvanometer is an instrument that can detect AND measure electric current. Unlike an ammeter which only measures current, a galvanometer is more sensitive and can detect the presence and direction of current, making it the correct answer.

A voltameter measures electric charge (quantity of electricity) through electrolysis, while ammeters measure current flow rate, galvanometers detect current direction, and voltmeters measure potential difference between two points.