Question : Which apparatus is used to measure the intensity of light?
Option 1: Lux Meter
Option 2: Calorimeter
Option 3: Anemometer
Option 4: Altimeter
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Correct Answer: Lux Meter
Solution : The answer is Lux meter.
A lux Meter operates by detecting light—the perceived intensity of brightness to the human eye. It accomplishes this by utilising a photosensitive cell. In the International System of Units (SI), the lux serves as the standard unit for illuminance, quantified in lumens per square metre (lm/m2).
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Question : Which of the following devices is used to measure humidity?
Option 1: Hydrometer
Option 2: Hygrometer
Option 3: Psychrometer
Option 4: Anemometer
Question : The apparatus used to test acidity of aqueous solution is
Option 1: pH meter
Option 2: Ammeter
Option 3: Hygrometer
Option 4: Acidmeter
Question : A non-SI unit called 'nit' is the unit of which of the following photometric quantities is used to measure a multitude of light intensities?
Option 1: Luminous exposure
Option 2: Luminance
Option 3: Luminosity
Option 4: Luminous emittance
Question : Which physical unit is defined as the field intensity that produces one newton (N) of force per ampere (A) per meter of the conductor?
Option 1: Candela
Option 2: Coulomb
Option 3: Tesla
Option 4: Pascal
Question : The instrument used for measuring air pressure is called
Option 1: Anemometer
Option 2: Barometer
Option 4: Thermometer
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