Physical Quantities in Physics
34 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following physical quantities are considered fundamental quantities, also known as basic quantities?

  • Length, Time, Mass, Temperature, Electrical Current, Luminous Intensity, Area
  • Length, Time, Mass, Acceleration, Electrical Current, Luminous Intensity, Amount of Substance
  • Area, Velocity, Density, Sp. Heat Capacity, Resistance, Luminous Intensity, mole
  • Length, Time, Mass, Temperature, Electrical Current, Luminous Intensity, Amount of Substance (correct)

    • What is the dimensional formula for momentum?

    M1L1T-1

    What are the two supplementary quantities used in physics?

    Plane angle and Solid angle

    What is the dimension of area?

    <p>L2</p> Signup and view all the answers

    What is the name given to the elementary quantities that form the basis of all other quantities in physics?

    <p>Fundamental or Basic Quantities</p> Signup and view all the answers

    Which international organization is responsible for selecting the seven fundamental physical quantities?

    <p>CGPM (General Conference on Weights and Measures)</p> Signup and view all the answers

    Which of the following is NOT a fundamental quantity?

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

    What is the term used to describe physical quantities that can be expressed in terms of basic quantities?

    <p>Derived Quantities</p> Signup and view all the answers

    What is the dimension of volume?

    <p>[L3]</p> Signup and view all the answers

    The dimension of a physical quantity depends on the formula used to calculate it.

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

    What is the dimension of density?

    <p>[M1L-3]</p> Signup and view all the answers

    What is the dimension of acceleration?

    <p>[M0L1T-2]</p> Signup and view all the answers

    The dimension of work is the same as the dimension of energy.

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

    What is the dimension of pressure?

    <p>[M1L-1T-2]</p> Signup and view all the answers

    What is the dimension of angular displacement?

    <p>[M0L0T0]</p> Signup and view all the answers

    What is the dimension of angular velocity?

    <p>[M0L0T-1]</p> Signup and view all the answers

    What is the dimension of angular acceleration?

    <p>[M0L0T-2]</p> Signup and view all the answers

    What is the value of the gravitational constant, G, in SI units?

    <p>6.67 × 10-11 m3/kg s2</p> Signup and view all the answers

    What is the dimension of specific heat capacity?

    <p>[M1L2T-2K-1]</p> Signup and view all the answers

    What is the dimension of the gas constant, R?

    <p>[M1L2T-2 mol-1 K-1]</p> Signup and view all the answers

    What is the dimension of coefficient of viscosity?

    <p>[M1L-1T-1]</p> Signup and view all the answers

    What is the dimension of Planck's constant?

    <p>[M1L2T-1]</p> Signup and view all the answers

    Adding two quantities with different dimensions is a valid operation in physics.

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

    The numerical value of a physical quantity remains constant regardless of the unit used.

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

    If we double the unit of length, how does the numerical value of area change?

    <p>It becomes one-fourth.</p> Signup and view all the answers

    In the SI system, what is the unit of force?

    <p>Newton (N)</p> Signup and view all the answers

    What is the SI unit of energy, work and heat?

    <p>Joule (J)</p> Signup and view all the answers

    What is the SI unit of power?

    <p>Watt (W)</p> Signup and view all the answers

    What is the SI unit of electric charge?

    <p>Coulomb (C)</p> Signup and view all the answers

    What is the SI unit of electric potential?

    <p>Volt (V)</p> Signup and view all the answers

    What is the SI unit of capacitance?

    <p>Farad (F)</p> Signup and view all the answers

    What is the SI unit of electrical resistance?

    <p>Ohm (Ω)</p> Signup and view all the answers

    What is the SI unit of magnetic field?

    <p>Tesla (T)</p> Signup and view all the answers

    What is the SI unit of activity of radioactive material?

    <p>The Becquerel, named after the French physicist Henri Becquerel, is the SI unit of activity of radioactive material, representing the rate of decay of radioactive material.</p> Signup and view all the answers

    Study Notes

    Physical Quantities

    • Physical quantities are measurable quantities used to describe the laws of physics.
    • Examples include length, velocity, acceleration, force, time, pressure, mass, and density.
    • Physical quantities are categorized into three types: fundamental, derived, and supplementary.

    Fundamental (Basic) Quantities

    • These are elementary quantities that are independent from each other.
    • Any other physical quantity can be derived from these basic quantities.
    • Seven fundamental quantities were chosen by the General Conference on Weights and Measures(CGPM): length, mass, time, temperature, electric current, luminous intensity, and amount of substance.

    Derived Quantities

    • Derived quantities are expressed in terms of fundamental quantities.
    • Examples include area, velocity, acceleration, force, momentum, work, energy, power, and pressure.

    Supplementary Quantities

    • There are two supplementary quantities: plane angle and solid angle.

    Dimensions of Physical Quantities

    • The dimension of a physical quantity represents the powers of fundamental quantities.
    • The dimension of length is [L], mass is [M], time is [T], and so on.
    • The dimension of a derived quantity is found by combining the dimensions of the fundamental quantities that define it.

    Dimensions of Physical Constants

    • Physical constants, like the gravitational constant and the speed of light, also have dimensions.
    • Determining the dimensions of physical constants allows for checking the dimensional consistency of equations.

    Limitations of Dimensional Analysis

    • Dimensional analysis is useful for checking if an equation is dimensionally correct but it cannot determine the numerical value of the constant of proportionality.
    • Dimensional analysis is limited to quantities where the relationship between variables is through multiplication and powers as it cannot handle trigonometric, logarithmic, or exponential relationships.
    • It only works if the quantity depends on no more than three independent variables.

    Converting Units

    • Conversion between different units involves multiplying the numerical value by a conversion factor.
    • The magnitude of a physical quantity remains constant when changing units

    SI Derived Units

    • Some SI derived units have names based on scientists who made significant contributions to the field of physics.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Lecture 1 Unit and Dimension PDF

    Description

    Test your knowledge on physical quantities, including fundamental, derived, and supplementary types. Understand key concepts such as length, mass, and velocity, and learn how they relate to the laws of physics. This quiz will reinforce your comprehension of essential physical measurements.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser