Q41. What is the primary function of a Microphone?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Convert sound vibrations in the air into electronic signals
Show Answer
Correct Answer: d) Convert sound vibrations in the air into electronic signals
Explanation: A microphone is a device that translates sound vibrations in the air into electronic signals and scribes them to a recording medium or over a loudspeaker. Microphones are used in various applications, such as telephones, hearing aids, public address systems, and recording devices.
Q42. What does a Microscope primarily detect?
a) Electric current
b) Wind speed
c) Altitude
d) Magnify small objects for observation
Show Answer
Correct Answer: d) Magnify small objects for observation
Explanation: A microscope is an instrument used to magnify small objects for observation and study. It uses lenses and a light source to provide an up-close view of samples, such as cells and microorganisms. Microscopes are essential tools in various fields, including biology, medicine, and materials science.
Q43. What is the primary function of an MRI (Magnetic Resonance Imaging)?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Produce detailed images of internal body structures
Show Answer
Correct Answer: d) Produce detailed images of internal body structures
Explanation: Magnetic Resonance Imaging (MRI) is a noninvasive medical imaging technique that uses a magnetic field and computer-generated radio waves to create detailed images of the organs and tissues in the body. MRI is used to diagnose various medical conditions and plan treatments, such as detecting tumors, assessing blood flow, and evaluating brain function.
Q44. What does a Nephelometer primarily measure?
a) Electric current
b) Concentration of suspended particulates in a liquid or gas colloid
c) Altitude
d) Sound intensity
Show Answer
Correct Answer: b) Concentration of suspended particulates in a liquid or gas colloid
Explanation: A nephelometer is an instrument that measures the concentration of suspended particulates in a liquid or gas colloid by employing a light beam and a light detector. Nephelometers are used in various applications, such as monitoring air quality, measuring visibility, and assessing immune function in medicine.
Q45. What is the primary function of an Odometer?
a) Measure electric current
b) Measure wind speed
c) Measure distance traveled by a vehicle
d) Measure sound intensity
Show Answer
Correct Answer: c) Measure distance traveled by a vehicle
Explanation: An odometer is an instrument used to measure the distance traveled by a vehicle. It is typically found in the dashboard of a car, truck, or motorcycle and records the total distance traveled by the vehicle since its manufacture. Odometers are essential for tracking vehicle usage, maintenance schedules, and fuel efficiency.
Q46. What does an Ohmmeter primarily measure?
a) Electric current
b) Wind speed
c) Altitude
d) Electrical resistance
Show Answer
Correct Answer: d) Electrical resistance
Explanation: An ohmmeter is an electrical instrument that measures electrical resistance, which is expressed in ohms. It can be used to measure the resistance of various electrical components and circuits, helping to diagnose and troubleshoot electrical problems
Q47. What is the primary function of a Periscope?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Enable observation over, around, or through obstacles
Show Answer
Correct Answer: d) Enable observation over, around, or through obstacles
Explanation: A periscope is an instrument used for observation over, around, or through obstacles that prevent direct line-of-sight observation. It uses mirrors or prisms to change the direction of light coming from the observed scene, allowing the observer to see their surroundings while remaining hidden or protected. Periscopes are commonly used in submarines and military applications.
Q48. What does a Photometer primarily measure?
a) Strength of electromagnetic radiation
b) Wind speed
c) Altitude
d) Sound intensity
Show Answer
Correct Answer: a) Strength of electromagnetic radiation
Explanation: A photometer is an instrument that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared, including the visible spectrum. Photometers are used in various applications, such as measuring light intensity, analyzing spectral distribution, and determining exposure in photography.
Q49. What is the primary function of a Polygraph?
a) Measure electric current
b) Measure wind speed
c) Measure altitude
d) Detect deception by monitoring physiological responses
Show Answer
Correct Answer: d) Detect deception by monitoring physiological responses
Explanation: A polygraph, also known as a lie detector, is an instrument used to detect deception by monitoring physiological responses, such as heart rate, blood pressure, and skin conductivity. Polygraphs are often used in criminal investigations, security screenings, and other situations where verifying the truthfulness of an individual is essential.
Q50. What does a Pycnometer primarily measure?
a) Electric current
b) Wind speed
c) Altitude
d) Density or specific gravity of liquids
Show Answer
Correct Answer: d) Density or specific gravity of liquids
Explanation: A pycnometer is an instrument used to measure the density or specific gravity of liquids. It consists of a calibrated container with a precise volume and a stopper with a small hole to allow excess liquid to escape. By weighing the pycnometer when empty, filled with a reference liquid, and filled with the sample liquid, the density or specific gravity of the sample can be calculated. Pycnometers are used in various applications, such as determining the concentration of solutes in solutions and assessing the purity of substances.