Measurement and Standard Units Quiz
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Questions and Answers

Which of the following is an example of using null methods of measurement?

  • Measuring capacitance directly
  • Comparing temperature with resistance using bridge circuits
  • Measuring weight with a balance (correct)
  • Establishing an empirical relation between temperature and bacteria elimination
  • What is the approach in indirect measurement methods?

  • Measuring directly
  • Establishing empirical relations (correct)
  • Comparing with a known quantity
  • Using calibrated systems
  • What is the purpose of null methods of measurement?

  • To compare the unknown quantity with a known quantity (correct)
  • To calibrate the system
  • To measure the quantity directly
  • To establish an empirical relation between quantities
  • How does indirect measurement work in the context of eliminating bacteria from a fluid?

    <p>By measuring the temperature of the fluid</p> Signup and view all the answers

    In what way do comparison methods differ from null methods in measurement?

    <p>Null methods eliminate the action of unknown quantity by a known counter quantity</p> Signup and view all the answers

    Why are indirect measurement methods preferred for difficult-to-measure parameters?

    <p>They establish an empirical relation with easily measurable related parameters</p> Signup and view all the answers

    What is the primary purpose of measurement?

    <p>To express the value of an unknown quantity in terms of a standard unit</p> Signup and view all the answers

    What is a standard in the context of measurement?

    <p>Both A and B</p> Signup and view all the answers

    What is a measuring instrument?

    <p>A device used to compare an unknown quantity with a standard unit</p> Signup and view all the answers

    In direct measurement methods, how is the unknown quantity measured?

    <p>By directly measuring the unknown quantity itself</p> Signup and view all the answers

    What is the purpose of the deflection method?

    <p>To directly indicate the value of the unknown quantity</p> Signup and view all the answers

    What are the different types of comparison methods mentioned in the text?

    <p>Null methods and differential methods</p> Signup and view all the answers

    Study Notes

    Measurement Basics

    • Measurement is a quantitative comparison between a given quantity and a standard unit of the same kind.
    • The result of measurement is expressed by a pointer deflection over a predefined scale or a number representing the ratio between the unknown quantity and the standard.
    • A standard is defined as the physical personification of the unit of measurement or its submultiple or multiple values.

    Direct Measurement Methods

    • Direct measurement methods involve measuring the unknown quantity directly without comparing it with a standard.
    • Examples include measurement of weight by a balance, measurement of resistance, capacitance, and inductance by bridge circuits.

    Comparison Methods

    • Comparison methods involve direct comparison of the unknown quantity with a standard of the same kind.
    • Examples include measurement of e.m.f by comparison with the e.m.f of a standard cell.

    Null Method

    • In the null method, the action of the unknown quantity upon the instrument is reduced to zero by the counter action of a known quantity of the same kind.

    Differential Method

    • In the differential method, the quantity to be measured is compared with a known quantity and the difference between these two is made zero.

    Indirect Measurement Methods

    • Indirect measurement methods involve comparing the unknown quantity with a standard using a calibrated system.
    • These methods are used when the desired parameter to be measured is difficult to measure directly, but has a relation with another parameter that can be easily measured.
    • Example: measuring bacteria elimination by measuring the temperature of the fluid, as the elimination is directly dependent upon the temperature.

    Deflection Method

    • In the deflection method, the value of the unknown quantity is directly indicated by the deflection of a pointer on a calibrated scale.

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    Description

    Test your knowledge on measurement, standard units, and devices used for comparison. Understand the concept of expressing measurement results via pointer deflection or numerical ratios.

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