Q71. What is the primary function of a Telescope?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Magnify and observe distant objects
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Correct Answer: d) Magnify and observe distant objects
Explanation: A telescope is an optical instrument used to magnify and observe distant objects, such as celestial bodies and other objects in space. It works by gathering and focusing light from these objects, allowing astronomers to study their properties and characteristics. Telescopes come in various types, including refracting telescopes that use lenses and reflecting telescopes that use mirrors to focus light.
Q72. What does a Thermometer primarily measure?
a) Temperature
b) Wind speed
c) Altitude
d) Sound intensity
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Correct Answer: a) Temperature
Explanation: A thermometer is an instrument used to measure temperature. It can measure the temperature of solids, liquids, and gases, and is available in various types, such as mercury-in-glass thermometers, alcohol-in-glass thermometers, and digital thermometers. Thermometers are essential tools in various fields, including healthcare, meteorology, and industrial processes.
Q73. What is the primary function of a Thermostat?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Regulate temperature in a system
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Correct Answer: d) Regulate temperature in a system
Explanation: A thermostat is a device used to regulate temperature in a system, such as an engine cooling system or a heating, ventilation, and air conditioning (HVAC) system. It works by sensing the temperature of the system and adjusting the flow of coolant or air to maintain the desired temperature. Thermostats are essential components in various applications, including automotive engines, home heating systems, and refrigeration units.
Q74. What does a Tonometer primarily measure?
a) Electric current
b) Wind speed
c) Altitude
d) Intraocular pressure
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Correct Answer: d) Intraocular pressure
Explanation: A tonometer is an instrument used to measure intraocular pressure (IOP), which is the pressure inside the eye. It is commonly used to screen for and monitor glaucoma, as elevated IOP can be a risk factor for the development of the disease. Tonometers are available in various types, such as applanation tonometers and non-contact tonometers, and are used by healthcare professionals during routine eye exams.
Q75. What is the primary function of a Transponder?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Receive and transmit signals in response to an interrogation
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Correct Answer: d) Receive and transmit signals in response to an interrogation
Explanation: A transponder is an electronic device that receives a signal and automatically transmits a different signal in response. Transponders are used in various applications, including aircraft identification, satellite communication, and vehicle key systems. In aviation, transponders help air traffic controllers identify and track aircraft on radar screens, while in satellite communication, they receive and transmit signals between ground stations and satellites.
Q76. What does a Udometer primarily measure?
a) Electric current
b) Amount of rainfall or precipitation
c) Altitude
d) Sound intensity
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Correct Answer: b) Amount of rainfall or precipitation
Explanation: A udometer, also known as a rain gauge or pluviometer, is an instrument used to measure the amount of rainfall or precipitation over a set period. It typically consists of a cylindrical container with a funnel-like lid that collects rainwater, which is then measured to determine the amount of precipitation. Udometers are used by meteorologists and hydrologists to gather data on precipitation for weather forecasting and monitoring purposes.
Q77. What is the primary function of a Venturi meter?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Measure the flow rate of fluids in a pipe
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Correct Answer: d) Measure the flow rate of fluids in a pipe
Explanation: A Venturi meter is an instrument used to measure the flow rate of fluids in a pipe. It works based on the Venturi effect, which states that the pressure of a fluid decreases as its velocity increases when flowing through a constricted section of a pipe. By measuring the pressure difference between the constricted and unconstricted sections of the pipe, the flow rate can be calculated. Venturi meters are used in various applications, such as water distribution systems, chemical processing plants, and oil and gas pipelines.
Q78. What does a Vernier primarily measure?
a) Electric current
b) Wind speed
c) Altitude
d) Small linear dimensions with high precision
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Correct Answer: d) Small linear dimensions with high precision
Explanation: A vernier is a measuring instrument used to measure small linear dimensions with high precision. It consists of a main scale and a sliding secondary scale, which allows for more accurate measurements than a standard ruler. Verniers are commonly used in various applications, such as mechanical engineering, manufacturing, and quality control, to measure the dimensions of objects and ensure their accuracy.
Q79. What is the primary function of a Viscometer?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Measure the viscosity of fluids
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Correct Answer: d) Measure the viscosity of fluids
Explanation: A viscometer, also known as a rheometer, is an instrument used to measure the viscosity of fluids, which is a measure of their resistance to flow. Viscometers are available in various types, such as capillary viscometers, rotational viscometers, and falling ball viscometers, and are used in various applications, such as determining the flow properties of liquids, quality control, and research and development.
Q80. What does a Voltmeter primarily measure?
a) Electric potential difference (voltage)
b) Wind speed
c) Altitude
d) Sound intensity
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Correct Answer: a) Electric potential difference (voltage)
Explanation: A voltmeter is an electrical instrument used to measure the electric potential difference (voltage) between two points in an electric circuit. It is typically connected in parallel with the circuit, allowing the voltage across the circuit elements to be measured. Voltmeters are available in various forms, including analog and digital devices, and are used in various applications, such as diagnosing and troubleshooting electrical problems and monitoring the performance of electrical systems.
Q81. What is the primary function of a Wattmeter?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Measure the power of an electric circuit
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Correct Answer: d) Measure the power of an electric circuit
Explanation: A wattmeter is an instrument used to measure the electric active power (or the average of the rate of flow of electrical energy) in watts of any given circuit. It works by measuring both voltage and current and determining the resultant power. Wattmeters are used in various applications, such as monitoring power consumption, managing energy savings, and comparing the efficiency of electrical systems.
Q82. What does a Wavemeter primarily measure?
a) Electric current
b) Wind speed
c) Altitude
d) Wavelength of a radio wave or light beam
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Correct Answer: d) Wavelength of a radio wave or light beam
Explanation: A wavemeter, also known as a wavelength meter, is an instrument used for precise wavelength measurements of light beams, such as laser beams, or the frequency of electromagnetic signals or radio signals. Wavemeters are typically based on interferometric effects and can be used in various applications, such as measuring the frequency of radio signals or determining the wavelength of light sources.