Applied Physics
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Questions and Answers

What are the basic physical quantities in the SI system?

  • Length, mass, time, electric current, temperature, amount of substance, luminous intensity (correct)
  • Area, angle, momentum, displacement, resistance, capacitance, frequency
  • Weight, volume, density, speed, energy, power, pressure
  • Distance, force, velocity, acceleration, work, torque, frequency

    • What is the principle behind the working of Vernier calipers?

  • Measurement by the deflection of a spring
  • Measurement by the relative position of two scales (correct)
  • Measurement by the expansion of a fluid
  • Measurement by the rotation of a wheel

    • What is meant by error in measurements?

  • Variation in measurements due to atmospheric conditions
  • Inaccuracy caused by the instrument's color
  • Difference between measured value and true value (correct)
  • Error introduced by the observer's perspective

    • What is the impulse of force?

    <p>The product of force and time</p> Signup and view all the answers

    How can the relation between newton and dyne be derived?

    <p>1 dyne = 10^-5 newton</p> Signup and view all the answers

    What is the symbol for the unit of force in the SI system?

    <p>N</p> Signup and view all the answers

    In the context of significant figures, which law states that in multiplication or division, the result should have the same number of significant figures as the quantity with the fewest significant figures?

    <p>Law of Division</p> Signup and view all the answers

    Which physical quantity is measured in dyne in the CGS system?

    <p>Force</p> Signup and view all the answers

    What is the SI unit of angular momentum?

    <p>kg m/s</p> Signup and view all the answers

    In the context of circular motion, which physical quantity is defined as the product of an object's mass and its velocity?

    <p>Linear momentum</p> Signup and view all the answers

    Study Notes

    Basic Physical Quantities in the SI System

    • Length (meter, m)
    • Mass (kilogram, kg)
    • Time (second, s)
    • Temperature (kelvin, K)
    • Electric current (ampere, A)
    • Amount of substance (mole, mol)
    • Luminous intensity (candela, cd)

    Vernier Caliper Principle

    • The Vernier caliper works by using a Vernier scale that is divided into smaller units than the main scale.
    • The difference between one division on the main scale and one division on the Vernier scale is called the Vernier constant.
    • When the jaws of the caliper are closed, the zero mark on the Vernier scale aligns with the zero mark on the main scale.
    • To measure a length, the jaws are opened and the position of the zero mark on the Vernier scale is observed.
    • The reading on the main scale is then added to the reading on the Vernier scale, multiplied by the Vernier constant, to obtain the final measurement.

    Error in Measurements

    • Errors in measurements are unavoidable and arise from various sources.
    • Systematic errors are consistently biased, while random errors are unpredictable and vary in each measurement.
    • Errors can be classified as gross errors, instrumental errors, observational errors, or environmental errors.

    Impulse of Force

    • Impulse of force is the product of the force and the time interval for which it acts.
    • It is equal to the change in momentum of the object.

    Relation Between Newton and Dyne

    • 1 newton (N) = 10^5 dyne
    • This can be derived by considering the conversion factors between the SI and CGS systems.

    Unit of Force in SI System

    • The SI unit of force is the newton (N).

    Significant Figures Rule

    • The rule states that the result of a multiplication or division should have the same number of significant figures as the quantity with the fewest significant figures.
    • This rule helps ensure the accuracy of calculations.

    Quantity Measured in Dyne

    • The physical quantity measured in dyne in the CGS system is force.

    SI Unit of Angular Momentum

    • The SI unit of angular momentum is kilogram meter squared per second (kg m²/s).

    Physical Quantity in Circular Motion

    • The physical quantity defined as the product of an object's mass and its velocity in circular motion is linear momentum.

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    Description

    Test your understanding of units and measurements in applied physics with this quiz. Explore questions on the principles, construction, and workings of Vernier calipers and micrometer screws, and label each part with neat diagrams. Ideal for preparing for GTU exams.

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