Q31. What is the primary function of a Hygrometer?
a) Measure humidity in the air
b) Detect underwater sounds
c) Measure altitude
d) Record motion or pressure
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Correct Answer: a) Measure humidity in the air
Explanation: A hygrometer is an instrument used to measure the humidity or the amount of water vapor in the air. It is commonly used in meteorological science, as well as in various applications such as humidity control in residential settings, coating industries, and monitoring humidity in pharmaceutical storage and manufacturing systems.
Q32. What does a Hydrophone primarily detect?
a) Electric current
b) Underwater sounds
c) Altitude
d) Motion or pressure
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Correct Answer: b) Underwater sounds
Explanation: A hydrophone is an underwater microphone designed to monitor and record underwater sounds. It works by converting sound waves into electrical signals, which can then be amplified and recorded. Hydrophones are used in various applications, including marine research, underwater communication, and military surveillance.
Q33. What does a Hygroscope primarily detect?
a) Changes in humidity
b) Underwater sounds
c) Altitude
d) Motion or pressure
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Correct Answer: a) Changes in humidity
Explanation: A hygroscope is an instrument that shows changes in humidity, such as in the atmosphere. It is used to monitor variations in humidity levels, which can be important in various applications, including weather forecasting and humidity control in different environments.
Q34. What is the primary function of a Hypsometer?
a) Measure electric current
b) Measure wind speed
c) Measure height or elevation
d) Record motion or pressure
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Correct Answer: c) Measure height or elevation
Explanation: A hypsometer is an instrument used to measure height or elevation. It can operate based on two different principles: trigonometry and atmospheric pressure. Hypsometers are commonly used in surveying, construction, and by arborists to measure the heights of trees.
Q35. What does a Kymograph primarily detect?
a) Electric current
b) Wind speed
c) Altitude
d) Graphically record motion or pressure
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Correct Answer: d) Graphically record motion or pressure
Explanation: A kymograph is a device that graphically records motion or pressure, such as blood pressure. It was initially a mechanical and hydraulic device, invented by German physiologist Carl Ludwig in the 1840s. Kymographs are used in various applications, including medical research and monitoring physiological processes
Q36. What is the primary function of a Lactometer?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Check the purity of milk by measuring its density
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Correct Answer: d) Check the purity of milk by measuring its density
Explanation: A lactometer is a hydrometer instrument used to check the purity of milk by measuring its density. It works on the principle of Archimedes’ principle and is used to determine the water content in milk or test the richness of the milk.
Q37. What does a Machmeter primarily measure?
a) Ratio of true airspeed to the speed of sound
b) Electric current
c) Wind speed
d) Sound intensity
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Correct Answer: a) Ratio of true airspeed to the speed of sound
Explanation: A Machmeter is an aircraft pitot-static system flight instrument that shows the ratio of the true airspeed to the speed of sound, a dimensionless quantity called Mach number. It is essential for high-speed aircraft, as they are often limited to a maximum operating Mach number, also known as MMO.
Q38. What is the primary function of a Magnetometer?
a) Measure magnetic fields
b) Measure electric current
c) Measure wind speed
d) Measure sound intensity
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Correct Answer: a) Measure magnetic fields
Explanation: A magnetometer is an instrument used to measure magnetic fields. It can detect the strength and direction of magnetic fields and is used in various applications, including geophysics, archaeology, and the detection of submarines.
Q39. What does a Manometer primarily measure?
a) Electric current
b) Wind speed
c) Pressure
d) Sound intensity
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Correct Answer: c) Pressure
Explanation: A manometer is an instrument used to measure pressure. It can be used to measure the pressure of gases or liquids and is commonly employed in various applications, such as monitoring pressure in pipes, tanks, and other closed systems
Q40. What is the primary function of a Micrometer?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Measure small distances or thicknesses with high precision
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Correct Answer: d) Measure small distances or thicknesses with high precision
Explanation: A micrometer is a precision measuring instrument used to measure small distances or thicknesses with high accuracy. It typically consists of a calibrated screw and a spindle, which can be adjusted to measure the distance between two opposing faces of an object. Micrometers are commonly used in various applications, such as mechanical engineering, manufacturing, and quality control.