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1. Which of the following is NOT a basic component of an analytical instrument?

A. Source
B. Sample holder
C. Detector
D. Capacitor
2. The component responsible for converting a physical or chemical property into an
electrical signal is the:
A. Source
B. Transducer
C. Amplifier
D. Display
3. In UV-Visible spectrophotometry, the light source is typically:
A. Laser diode
B. Tungsten or deuterium lamp
C. Mercury vapor lamp
D. Halogen lamp
4. A monochromator is used to:
A. Increase signal strength
B. Filter out noise
C. Isolate a single wavelength of light
D. Cool the system
5. Accuracy refers to:
A. Consistency of repeated measurements
B. Closeness to the true or accepted value
C. Ability to detect low concentrations
D. Stability of the instrument over time
6. The role of the sample holder is to:
A. Detect signals
B. Transmit power
C. Contain the analyte during measurement
D. Amplify current
7. A photomultiplier tube is commonly used as a:
A. Source
B. Detector
C. Filter
D. Wavelength selector
8. Which of the following components helps to improve the signal-to-noise ratio?
A. Attenuator
B. Filter

1 answer

Here are the answers to your questions based on the principles of analytical instruments:

  1. D. Capacitor (A basic component would typically include Source, Sample holder, and Detector, but a capacitor is not fundamental to all analytical instruments.)

  2. B. Transducer (The transducer converts a physical or chemical property into an electrical signal.)

  3. B. Tungsten or deuterium lamp (For UV-Visible spectrophotometry, tungsten lamps are used for visible light and deuterium lamps for UV light.)

  4. C. Isolate a single wavelength of light (Monochromators are designed to select specific wavelengths from a broad spectrum of light.)

  5. B. Closeness to the true or accepted value (Accuracy is about how close a measured value is to the true value.)

  6. C. Contain the analyte during measurement (The sample holder is responsible for securely holding the sample during measurement.)

  7. B. Detector (Photomultiplier tubes are commonly used as detectors in analytical instruments.)

  8. B. Filter (Filters help to improve the signal-to-noise ratio by selectively allowing certain wavelengths to pass while blocking others.)

If you have any further questions, feel free to ask!