Measuring Instruments

What is used to measure temperature?
a) Barometer
b) Hygrometer
c) Thermometer
d) Calorimeter
✅ c) Thermometer
Explanation: A thermometer measures temperature, often using mercury or alcohol.

Instrument used to measure atmospheric pressure:
a) Manometer
b) Barometer
c) Hygrometer
d) Thermometer
✅ b) Barometer
Explanation: Barometers detect changes in air pressure, helping predict weather.

Which instrument is used to measure electric current?
a) Ammeter
b) Voltmeter
c) Galvanometer
d) Ohmmeter
✅ a) Ammeter
Explanation: Ammeters are connected in series and measure current in amperes.

Instrument to measure humidity:
a) Anemometer
b) Barometer
c) Hygrometer
d) Pyrometer
✅ c) Hygrometer
Explanation: Hygrometers measure moisture content in the atmosphere.

Which instrument measures potential difference?
a) Galvanometer
b) Voltmeter
c) Ammeter
d) Ohmmeter
✅ b) Voltmeter
Explanation: Voltmeters are connected in parallel to measure voltage.

Used to measure blood pressure:
a) Thermometer
b) Barometer
c) Sphygmomanometer
d) Hydrometer
✅ c) Sphygmomanometer
Explanation: It measures systolic and diastolic pressure using mercury or digital readings.

Which instrument is used to measure wind speed?
a) Hygrometer
b) Anemometer
c) Wind vane
d) Thermometer
✅ b) Anemometer
Explanation: Anemometers are crucial in meteorology for wind speed data.

Instrument for measuring altitude:
a) Altimeter
b) Calorimeter
c) Barometer
d) Chronometer
✅ a) Altimeter
Explanation: Altimeters use air pressure to estimate height above sea level.

To measure relative density of liquids:
a) Barometer
b) Calorimeter
c) Hydrometer
d) Thermometer
✅ c) Hydrometer
Explanation: Hydrometers float in liquid to indicate density.

Device to measure heat of chemical reactions:
a) Hygrometer
b) Calorimeter
c) Spectrometer
d) Barometer
✅ b) Calorimeter
Explanation: Calorimeters quantify energy changes during physical or chemical reactions.

Which instrument is used to detect and measure radiation?
a) Ammeter
b) Galvanometer
c) Geiger-Müller counter
d) Spectrometer
✅ c) Geiger-Müller counter
Explanation: GM counters detect ionizing radiation like alpha, beta, and gamma rays.

Which device measures seismic waves?
a) Seismograph
b) Oscilloscope
c) Altimeter
d) Anemometer
✅ a) Seismograph
Explanation: Seismographs record Earth tremors and earthquakes.

To measure luminous intensity:
a) Lux meter
b) Colorimeter
c) Spectrometer
d) Thermopile
✅ a) Lux meter
Explanation: Lux meters measure light in terms of lux (lumens/m²).

Instrument to measure angles of elevation/depression:
a) Sextant
b) Barometer
c) Theodolite
d) Chronometer
✅ c) Theodolite
Explanation: Theodolites are used in surveying and construction.

Used to measure depth of ocean:
a) Radar
b) Sonar
c) Altimeter
d) Magnetometer
✅ b) Sonar
Explanation: SONAR uses sound waves to calculate underwater depth.

Device that detects presence of electric current:
a) Voltmeter
b) Galvanometer
c) Ammeter
d) Potentiometer
✅ b) Galvanometer
Explanation: Galvanometers detect current direction and small amounts.

Used to measure frequency of sound:
a) Oscilloscope
b) Stroboscope
c) Hertz meter
d) Sound level meter
✅ c) Hertz meter
Explanation: Hertz meters show the frequency (Hz) of waves or sound.

Instrument used for measuring angles in navigation:
a) Altimeter
b) Sextant
c) Clinometer
d) Barometer
✅ b) Sextant
Explanation: Sextants measure celestial object angles for navigation.

What does a dynamometer measure?
a) Electric charge
b) Force or torque
c) Light intensity
d) Temperature
✅ b) Force or torque
Explanation: Dynamometers test engine power or mechanical force.

Instrument that measures electric resistance:
a) Potentiometer
b) Ohmmeter
c) Ammeter
d) Voltmeter
✅ b) Ohmmeter
Explanation: Ohmmeters are used to find resistance in an electrical circuit.

Used to analyze light spectra:
a) Spectrometer
b) Calorimeter
c) Hygrometer
d) Barometer
✅ a) Spectrometer
Explanation: Spectrometers break light into components to study wavelengths.

What is a tachometer used for?
a) Measuring vehicle distance
b) Measuring engine temperature
c) Measuring rotational speed
d) Measuring time
✅ c) Measuring rotational speed
Explanation: Tachometers display revolutions per minute (RPM).

Which instrument measures sound intensity?
a) Sound level meter
b) Decibel gauge
c) Audiometer
d) Hertz meter
✅ a) Sound level meter
Explanation: It gives sound intensity in decibels (dB).

Instrument for measuring blood oxygen saturation:
a) Sphygmomanometer
b) Oximeter
c) Stethoscope
d) Electrocardiograph
✅ b) Oximeter
Explanation: Oximeters use light to detect oxygen saturation in blood.

What does a barograph do?
a) Records humidity
b) Records air pressure over time
c) Measures wind speed
d) Measures temperature
✅ b) Records air pressure over time
Explanation: Barographs provide a pressure chart used in weather forecasting.

Used to measure rainfall:
a) Hygrometer
b) Rain gauge
c) Barometer
d) Anemometer
✅ b) Rain gauge
Explanation: Rain gauges collect and measure precipitation.

Instrument used to measure electric potential:
a) Electroscope
b) Voltmeter
c) Potentiometer
d) Ammeter
✅ c) Potentiometer
Explanation: Potentiometers compare electric potential in circuits.

Used for precise time measurement:
a) Stopwatch
b) Chronometer
c) Digital watch
d) Timer
✅ b) Chronometer
Explanation: Chronometers offer precise timekeeping, especially for navigation.

To detect electrical charge:
a) Ammeter
b) Voltmeter
c) Electroscope
d) Galvanometer
✅ c) Electroscope
Explanation: Electroscopes show presence of static electricity.

Device for measuring small masses:
a) Spring balance
b) Beam balance
c) Electronic balance
d) Dynamometer
✅ c) Electronic balance
Explanation: Offers precision up to micrograms in lab conditions.

The instrument used to measure leaf area in botany is:
a) Barometer
b) Lux meter
c) Planimeter
d) Altimeter
✅ c) Planimeter
Explanation: Planimeters measure area of irregular leaf surfaces.

An oscilloscope is used for measuring:
a) Voltage only
b) Sound
c) Varying electrical signals
d) Magnetic field
✅ c) Varying electrical signals
Explanation: It visualizes waveforms of electrical currents.

Which instrument is used to observe bacterial growth?
a) Microscope
b) Thermocouple
c) Spectrophotometer
d) Barometer
✅ a) Microscope
Explanation: Microscopes magnify tiny life forms.

Instrument to measure nuclear radiation dose:
a) Lux meter
b) Dosimeter
c) Seismometer
d) Calorimeter
✅ b) Dosimeter
Explanation: Measures radiation exposure over time.

A manometer measures:
a) Blood sugar
b) Atmospheric pressure
c) Pressure of gases/liquids in a closed system
d) Electric field
✅ c) Pressure of gases/liquids in a closed system
Explanation: U-tube manometers detect pressure differences.

Which instrument measures light absorption by solutions?
a) Spectrophotometer
b) Hygrometer
c) Radiometer
d) Lux meter
✅ a) Spectrophotometer
Explanation: Used in biochemistry to analyze concentrations.

Pyrometer is used to measure:
a) Wind pressure
b) High temperature
c) Altitude
d) Electric resistance
✅ b) High temperature
Explanation: Pyrometers are non-contact devices used in kilns and furnaces.

Instrument to detect orientation/direction:
a) Magnetometer
b) Gyroscope
c) Barometer
d) Oscilloscope
✅ b) Gyroscope
Explanation: Maintains direction based on angular momentum.

Which measures magnetic field?
a) Electrometer
b) Thermopile
c) Magnetometer
d) Voltmeter
✅ c) Magnetometer
Explanation: Detects strength and direction of magnetic fields.

Device to measure Earth's gravity:
a) Gravitometer
b) Gravimeter
c) Barometer
d) Seismograph
✅ b) Gravimeter
Explanation: Used in geophysics to detect subsurface density changes.

Radiometer measures:
a) Light intensity
b) Sound
c) Radio waves
d) Thermal radiation
✅ d) Thermal radiation
Explanation: Measures radiant energy from a source.

What does an audiometer test?
a) Light sensitivity
b) Hearing ability
c) Blood pressure
d) Taste sensitivity
✅ b) Hearing ability
Explanation: Audiometers test auditory range and hearing loss.

What is a planimeter used for?
a) Pressure
b) Measuring area
c) Density
d) Elevation
✅ b) Measuring area
Explanation: Traces boundaries to compute enclosed areas.

Which of these measures electric field strength?
a) Galvanometer
b) Voltmeter
c) Electrometer
d) Multimeter
✅ c) Electrometer
Explanation: Measures voltage or charge accurately.

Polarimeter is used to measure:
a) Optical rotation
b) Current flow
c) Altitude
d) pH level
✅ a) Optical rotation
Explanation: Determines optical activity in chemical substances.

Tachometer is used in:
a) Barometers
b) Engine RPM measurement
c) AC voltage monitoring
d) Mass spectrometry
✅ b) Engine RPM measurement
Explanation: Measures speed of rotation in motors/engines.

What does a bolometer measure?
a) Heat radiation
b) Sound
c) Magnetic field
d) Blood glucose
✅ a) Heat radiation
Explanation: Detects electromagnetic radiation via resistance change.

Instrument used to measure breath alcohol content:
a) Sphygmomanometer
b) Alcometer
c) Luxmeter
d) Barometer
✅ b) Alcometer
Explanation: Commonly used in DUI checks.

What is a photometer used for?
a) Speed
b) Electric current
c) Light intensity
d) Chemical purity
✅ c) Light intensity
Explanation: Measures brightness and flux of light.

Thermocouple is used to measure:
a) Air flow
b) Temperature
c) Voltage
d) Pressure
✅ b) Temperature
Explanation: Works by voltage generated due to temperature difference between two metals.