Different scientific instruments are used to measure or observe physical quantities. Questions that match an instrument with its use are common and easy to score in exams.
Measuring Pressure and Weather
- Barometer: measures atmospheric pressure.
- Hygrometer: measures humidity.
- Anemometer: measures wind speed.
- Thermometer: measures temperature.
Electrical Instruments
- Ammeter: measures electric current.
- Voltmeter: measures voltage.
- Galvanometer: detects small current.
Optical and Observing Instruments
- Microscope: views very small objects.
- Telescope: views distant objects like stars.
- Periscope: used in submarines to see above the surface.
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Other Important Instruments
- Seismograph: records earthquakes.
- Sphygmomanometer: measures blood pressure.
- Stethoscope: listens to heart and lung sounds.
- Lactometer: checks the purity of milk.
- Speedometer: shows the speed of a vehicle.
Important Facts
A barometer falling suddenly indicates a storm. The Richter scale measures earthquake magnitude. An odometer measures the distance covered by a vehicle.
Quick Revision Points
- Barometer measures atmospheric pressure.
- Seismograph records earthquakes.
- Ammeter measures current; voltmeter measures voltage.
- Lactometer checks milk purity.
- Hygrometer measures humidity.
- Periscope is used in submarines.
- Anemometer measures wind speed.