Physics Quiz on Motion and Laws
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Questions and Answers

Which of the following statements correctly describes Kirchoff's Current Law?

  • The direction of current flow is not important in calculations.
  • The sum of currents entering a junction is greater than the sum of currents leaving.
  • Current can be created or destroyed at junctions.
  • The total incoming current equals the total outgoing current at a junction. (correct)
  • What is the modulus of the charge represented by -3 units?

  • -3 units
  • 0 units
  • Cannot be calculated
  • 3 units (correct)
  • In a situation where an object travels along a path of 150 meters and returns to the starting point, what is the displacement?

  • 100 meters
  • 150 meters
  • 0 meters (correct)
  • 75 meters
  • If an object moves in a straight line from point A to point B and then from point B to point C, with distances of 50 meters and 100 meters respectively, what is the total distance covered?

    <p>150 meters</p> Signup and view all the answers

    Which of the following best defines a vector quantity?

    <p>A measurement that has both magnitude and direction.</p> Signup and view all the answers

    What is the fundamental unit for mass?

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

    Which of the following is an example of a vector quantity?

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

    In the context of units, what does 'MKS' stand for?

    <p>Meter, Kilogram, Second</p> Signup and view all the answers

    What is the derived unit of speed?

    <p>m/sec</p> Signup and view all the answers

    Which of the following statements about tensor quantities is true?

    <p>They have magnitude and direction but do not follow the vector law of triangle addition.</p> Signup and view all the answers

    What is the value of sin(π) in a sine wave?

    <p>0</p> Signup and view all the answers

    In which system of units is 'foot' a fundamental unit?

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

    What can be expressed as a unit vector?

    <p>Any vector with a magnitude of 1.</p> Signup and view all the answers

    Study Notes

    CDS/CAPF 2025 Physics Lecture - Unit and Measurement -2

    • The lecture covers topics related to units and measurements, as part of the CDS/CAPF 2025 physics syllabus.
    • Topics include: quantities (राशियाँ), distance, displacement, velocity, acceleration, dimensional formulas and nomenclature (नामकरण).

    Fundamental Units

    • Length (L) - unit is meter (m)
    • Mass (M) - unit is kilogram (kg)
    • Time (T) - unit is second (s)

    Derived Units

    • Speed - unit is meters per second (m/s)
    • Acceleration - unit is meters per second squared (m/s²)
    • Force - unit is Newton (N) = kg⋅m/s²

    Other Units

    • Angle - unit is degree (°), radian (rad) conversion (180° = π rad), and 1 rad = 180°/π = 57.3°
    • Amount of substance - unit is mole (mol)
    • Luminous intensity - unit is candela (cd)
    • Electric current - unit is ampere (A)
    • Temperature - unit is Kelvin (K)
    • Luminous intensity - unit is candela (cd)

    Systems of Units

    • FPS (Foot, Pound, Second)
    • CGS (Centimeter–gram–second)
    • MKS (Meter, Kilogram, Second)
    • SI (Système International)

    Scalar and Vector Quantities

    • Scalar quantities have only magnitude (e.g., mass, speed, distance).
    • Vector quantities have both magnitude and direction (e.g., velocity, acceleration, displacement).

    Vector Representation

    • Vectors are shown using arrows where the length of the arrow represents the magnitude and the arrowhead indicates the direction.
    • Vector addition follows the triangle law.
    • The resultant of two vectors can be found using the Pythagorean theorem.

    Unit Vectors

    • Unit vectors have a magnitude of 1
    • A vector can be written as the product of its magnitude and unit vector in the direction of the vector.
    • Unit vectors along x, y and z axis are î, ĵ and k̂ respectively.

    Kinematic and Dynamic Quantities

    • Kinematic quantities (like displacement, velocity, acceleration) describe motion without considering the cause of the motion
    • Dynamic quantities (like force, momentum, energy) describe motion and the causes of the motion.

    Kinematic Concepts

    • Distance and displacement
    • Speed and velocity
    • Acceleration
    • Examples related to these concepts are covered

    Other Concepts

    • Topics on different types of quantities include scalar, vector, tensor
    • Different laws are introduced to help calculate the quantities, such as the triangle rule, Kirchhoff's Current Law, Kirchhoff's Voltage Law.
    • Examples of these quantities in physics calculations are included.

    Problems/Calculations

    • Examples and solved problems illustrating the concepts are presented
    • Practical applications and examples on calculations are given.

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    Description

    Test your understanding of fundamental physics concepts, including Kirchoff's Current Law, displacement, distance, and vector quantities. This quiz covers key principles relevant to your physics studies and challenges your analytical skills.

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