Measurement and Physical Quantities Quiz
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Questions and Answers

What is the resultant force R when combining forces F1 = 4N and F2 = 5N at right angles?

  • 10.5 N
  • 8.2 N
  • 9 N
  • 6.4 N (correct)

    • When measuring the diagonal of the parallelogram drawn for two vectors, what does the diagonal represent?

  • The magnitude and direction of the resultant vector (correct)
  • The largest of the two vectors
  • The angle between the vectors
  • The sum of the two vectors

    • What procedure should be followed after drawing a parallelogram to find the resultant force?

  • Multiply the lengths of the sides
  • Divide the lengths of the sides
  • Add the angles of the vectors
  • Measure the length of the diagonal (correct)

    • What trigonometric method can be used to resolve a force vector into its components?

    <p>Soh Cah Toa</p> Signup and view all the answers

    What is the vertical component of a 20N force exerted at an angle of 30° with the horizontal?

    <p>17.32 N</p> Signup and view all the answers

    In SI units, what is the base unit for mass?

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

    Which of the following is a common prefix used in SI units?

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

    What is the primary advantage of using SI units over the British engineering system?

    <p>Universally adopted and standardized</p> Signup and view all the answers

    What is the primary factor that affects the period of a pendulum?

    <p>Length of the pendulum</p> Signup and view all the answers

    Which of the following statements is NOT true regarding the period of a simple pendulum?

    <p>The mass of the pendulum bob significantly affects the period.</p> Signup and view all the answers

    During the experiment, how many complete oscillations is the timing conducted for?

    <p>20 complete oscillations</p> Signup and view all the answers

    What is the fixed variable in the pendulum experiment?

    <p>Mass of the pendulum bob</p> Signup and view all the answers

    Why is it important to release the pendulum from an angle less than 10 degrees?

    <p>To minimize its effect on the period of oscillation</p> Signup and view all the answers

    What is the relationship between the length of the pendulum and the period of oscillation?

    <p>They are directly proportional</p> Signup and view all the answers

    In the context of the pendulum experiment, what does the manipulated variable represent?

    <p>The length of the pendulum thread</p> Signup and view all the answers

    Which material is NOT mentioned as part of the apparatus for the pendulum experiment?

    <p>Power source</p> Signup and view all the answers

    How many significant figures are in the number 0.004500?

    <p>4</p> Signup and view all the answers

    Which of the following statements about zeros is accurate?

    <p>In a decimal, zeros after non-zero digits are significant.</p> Signup and view all the answers

    When rounding the number 1296 to two significant figures, what is the result?

    <p>1300</p> Signup and view all the answers

    What is the precision of a tape measure according to the provided content?

    <p>0.01 cm</p> Signup and view all the answers

    Which instrument would be most suitable for measuring the diameter of a hair?

    <p>Micrometer screw gauge</p> Signup and view all the answers

    In order to avoid parallax error while taking a measurement, one should:

    <p>Position your eye directly above the marking.</p> Signup and view all the answers

    If an integer includes trailing zeros, such as 1300, how many significant figures does it contain?

    <p>2 or 3</p> Signup and view all the answers

    The main components of a vernier caliper are:

    <p>Main scale and sliding vernier scale</p> Signup and view all the answers

    What is the factor represented by the prefix 'kilo'?

    <p>$10^{3}$</p> Signup and view all the answers

    How would you convert 4567.8 cm to kilometers?

    <p>0.045678 km</p> Signup and view all the answers

    What is the standard form of 12300000 m?

    <p>1.23 x $10^{7}$ m</p> Signup and view all the answers

    What is the result of converting 123.4 km/h to m/s?

    <p>34.3 m/s</p> Signup and view all the answers

    Which of the following prefixes represents a factor of $10^{-6}$?

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

    To convert 345.6 g/cm³ to kg/m³, what is the final result?

    <p>345600 kg/m³</p> Signup and view all the answers

    Which statement about the standard form is correct?

    <p>A must be equal to or greater than 1 and less than 10.</p> Signup and view all the answers

    What equation shows the conversion of 4567.8 km to meters?

    <p>4567.8 km = 4567.8 x $10^{3}$ m</p> Signup and view all the answers

    What is the relationship between the length of a simple pendulum and the square of the period of oscillation?

    <p>Length is directly proportional to T2</p> Signup and view all the answers

    Which factors affect the period of a pendulum?

    <p>Length of pendulum and acceleration due to gravity</p> Signup and view all the answers

    How does the period of a pendulum change with varying length?

    <p>As length increases, period increases</p> Signup and view all the answers

    What is the effect of gravitational field strength on the period of a pendulum?

    <p>Weaker gravity increases the period</p> Signup and view all the answers

    What measurement is NOT needed when using a ticker tape timer?

    <p>Mass of the moving object</p> Signup and view all the answers

    What must be counted to measure time taken using a ticker tape timer?

    <p>The number of spaces between the dots</p> Signup and view all the answers

    What will happen to the time taken for 20 oscillations on the Moon compared to Earth?

    <p>It will be longer on the Moon</p> Signup and view all the answers

    What is the effect of the mass of the pendulum bob on its period?

    <p>The period is independent of the mass</p> Signup and view all the answers

    What is the correct label for the x-axis when plotting Length vs Period squared?

    <p>Length of String (l) in m</p> Signup and view all the answers

    Which method is NOT recommended to improve the accuracy of the pendulum experiment?

    <p>Use a large amplitude for the oscillation</p> Signup and view all the answers

    When drawing the line of best fit on a graph, it should be balanced between points plotted above and below. What does this mean?

    <p>The line should be straight and evenly distribute distance from all points.</p> Signup and view all the answers

    In the experiment, which factor could increase air resistance affecting the results?

    <p>Operating a fan nearby</p> Signup and view all the answers

    What scale should be avoided when plotting a graph?

    <p>1:3 and 1:9</p> Signup and view all the answers

    Which of these is a correct way to plot points on a graph?

    <p>Plot points using a cross (+).</p> Signup and view all the answers

    What is the purpose of ensuring firm support in a pendulum experiment?

    <p>To prevent vibrations that could affect measurements.</p> Signup and view all the answers

    What is the period squared (T²) when the length of the string is 0.80 m?

    <p>3.20 s²</p> Signup and view all the answers

    Study Notes

    Measurement and Physical Quantities

    • Physical quantities have magnitude and unit.
    • Base quantities are fundamental quantities like length, mass, time, etc.
    • Derived quantities are combinations of base quantities.
    • SI units (International System of Units) are used for measurement.
    • Common prefixes are used to express very large or very small quantities.
    • Various instruments are used for measuring different physical quantities like length, time, etc.
    • Parallax error occurs when the observer's eye is not directly above the measurement marking.
    • Zero error in instruments needs to be accounted for in measurements.
    • Trigonometric functions (SohCahToa) can be used to find components of vectors.
    • Vectors have both magnitude and direction, while scalars only have magnitude.
    • Vectors can be added using different methods.
    • Density is mass per unit volume
    • Density is calculated using the mass and volume of an object.
    • Objects float or sink depending on their density relative to the surrounding liquid's density.
    • Various instruments are used to measure different types of physical quantities.
    • Key instruments for measuring length, like Vernier calipers, meter rules, micrometer screw gauges, tape measure, etc.
    • Key instruments for measuring time, like stopwatches, pendulums, and ticker-tape timers.
    • Calculation methods for using different instruments
    • Calculations on density, and use of formulas

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    Measurement and Physical Quantities PDF

    Description

    Test your knowledge on measurement and physical quantities! This quiz covers fundamental concepts such as base and derived quantities, SI units, and the impact of errors in measurements. Dive into the world of vectors, scalars, and density to enhance your understanding.

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