Science Class Quiz: Measurements and Units
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Questions and Answers

What is the scientific notation for the number 0.0056?

  • 0.56 × 10^-2
  • 56 × 10^-4
  • 5.6 × 10^-3 (correct)
  • 5.6 × 10^3

    • All non-zero digits in a number are significant figures.

    True

    What is the formula to calculate weight?

    w = mg

    When converting from g/cm³ to kg/m³, you must ______ by 1000.

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

    Match the prefixes with their respective values:

    <p>Kilo = 10^3 Centi = 10^-2 Milli = 10^-3 Nano = 10^-9</p> Signup and view all the answers

    Which unit is used to measure density?

    <p>g/cm³</p> Signup and view all the answers

    What is the displacement method used for?

    <p>Measuring volume</p> Signup and view all the answers

    What is the result of adding two parallel vectors, 2N to the left and 3N to the left?

    <p>-5N to the left</p> Signup and view all the answers

    A systematic error means all measurements of a quantity are wrong by varying amounts.

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

    What does the gradient 'm' represent in the equation of a straight line y = mx + c?

    <p>The change in y divided by the change in x.</p> Signup and view all the answers

    In vector addition, the resultant vector is found by combining the __________ of the vectors.

    <p>magnitudes and directions</p> Signup and view all the answers

    Match the following concepts with their definitions:

    <p>Scalar quantity = Has only magnitude Vector quantity = Has both magnitude and direction Systematic error = Constant error in all measurements Gradient = Change in y divided by change in x</p> Signup and view all the answers

    How many significant figures are in the number 20,007?

    <p>5</p> Signup and view all the answers

    Trailing zeros to the left of the decimal point are significant.

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

    What is the formula to calculate the period of a simple pendulum?

    <p>T = t/n</p> Signup and view all the answers

    The SI unit for measuring length is the ______.

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

    Match the following instruments with their primary usage:

    <p>Ruler = Measuring length Vernier Caliper = Measuring small diameters Tape Measure = Measuring long distances Micrometer Screw Gauge = Measuring very small lengths</p> Signup and view all the answers

    Which of the following factors does NOT affect the period of a pendulum?

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

    Frequency is measured in kilograms.

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

    What is sensitivity in terms of measuring instruments?

    <p>The smallest change an instrument can detect.</p> Signup and view all the answers

    In measuring the length of an object, we can use a ______.

    <p>tape measure</p> Signup and view all the answers

    The smallest division of a micrometre screw gauge is 0.01 cm.

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

    What is the basic formula for calculating the volume of a rectangular solid?

    <p>length × width × height</p> Signup and view all the answers

    The final reading of the micrometre screw gauge is the sum of the main scale reading and the __________ reading.

    <p>circular scale</p> Signup and view all the answers

    Match the measurement method to its description:

    <p>Micrometre Screw Gauge = Measures small lengths accurately Graduated Cylinder = Measures liquid volumes Displacement Method = Calculates volume of irregular solids Density Calculation = Mass per unit volume</p> Signup and view all the answers

    What is the SI unit for density?

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

    For measuring volume using the displacement method, only solids can be used.

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

    How do you calculate the volume of an object using the displacement method?

    <p>Final volume - Initial volume</p> Signup and view all the answers

    To create a proper graph, the __________ should be labeled correctly on each axis.

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

    What measurement is taken first when using a micrometre screw gauge?

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

    What should you put at the top of the graph page?

    <p>A title in ALL CAPS and underlined</p> Signup and view all the answers

    The x-axis should not have any units labeled.

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

    What is the equation representing a linear relationship that does not pass through the origin?

    <p>y = mx + c</p> Signup and view all the answers

    To analyze data using graphs, you need to plot points based on ordered pairs, represented as (x, ______).

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

    Match the following terms related to graphing with their definitions:

    <p>Range = The difference between the maximum and minimum values Proportionality = A linear relationship through the origin Scale = The unit representation on the graph Intercept = The point where the graph crosses an axis</p> Signup and view all the answers

    What is the purpose of calculating the scale for both axes?

    <p>To ensure the graph fits on the graph page</p> Signup and view all the answers

    Using pen for drawing the graph is recommended for neatness.

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

    What happens if the plotted points lie close to a straight line through the origin?

    <p>They show direct proportionality between the two variables.</p> Signup and view all the answers

    When plotting graphs, you should stick to a _____ scale for convenience.

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

    What does the intercept on the temperature axis represent in the graph of gas pressure against temperature?

    <p>Absolute Zero of temperature</p> Signup and view all the answers

    Study Notes

    Measurements

    • Fundamental Quantities: A set of seven quantities used to define other physical quantities. Includes mass (kg), length (m), time (s), current (A), temperature (K), amount of substance (mol), and luminous intensity (cd).
    • Derived Quantities: Quantities calculated from fundamental quantities. Examples include speed (m/s), acceleration (m/s²), force (N), energy (J), etc.
    • SI Units: The International System of Units, which are the standard units used in science and engineering.
    • Prefixes: Units of multiples or sub-multiples of a base unit, used to represent large or small numbers. (e.g., kilo- = 103)

    Measurements- Measuring Time

    • Simple Pendulum: Used for measuring time. Length (l) and acceleration due to gravity (g) affect period (T). The relationship is T = 2π√(l/g).

    Measurements- Measuring Length

    • Instruments: Ruler, tape measure, Vernier caliper, micrometer screw gauge.
    • Sensitivity: The smallest change an instrument can detect. (e.g., micrometers have higher sensitivity than rulers).
    • Precision: How consistent repeated measurements are.
    • Accuracy: How close a measurement is to its true value.

    Measurements- Measuring Volume

    • Displacement Method: Calculating volume through measuring the change in volume of water when the object is submerged.

    Measurements-Measuring Mass & Calculating Density

    • Density: Mass per unit volume (mass/volume). Units are g/cm³ or kg/m³.

    Graphs

    • Graph Construction and Analysis: A detailed guide on how to accurately construct graphs, including labeling axes with correct units, choosing appropriate scale, plotting points and drawing the best-fit line. Key considerations for effective graph construction include using a pencil, keeping it clean/neat and making sure the graph covers most of the graph page

    Vectors

    • Vector vs. Scalar Quantities: Vectors have both magnitude and direction (e.g., displacement, velocity, force), while scalars only have magnitude (e.g., distance, speed, mass).
    • Vector Addition: Combining vectors. Methods include parallelogram law and scale drawing.

    Linear Motion

    • Motion Graphs: Graphs relating distance/displacement to time, used to interpret motion (stationary objects, objects in uniform/non-uniform motion, etc.) as well as velocity/speed versus time, and the relationship between velocity and acceleration.
    • Kinematics: A branch of mechanics describing motion without considering the forces that cause it. Key concepts include speed, velocity, and acceleration. (calculations formulas)

    Significant Figures

    • Rules: All non-zero digits are significant. Zeros between non-zero digits are significant. Leading zeros are not significant. Trailing zeros after a decimal point are significant.
    • Applications: Used for reporting measurements with appropriate precision. Crucial for scientific calculations.

    Index Notation & Conversion

    • Scientific notation: A standardized way of writing numbers that are very large or very small, allowing for better calculation and reducing calculation errors.

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    Description

    Test your understanding of important scientific concepts related to measurements, units, and significant figures. This quiz covers topics such as the scientific notation, density calculation, and vector addition. Perfect for science students looking to strengthen their knowledge!

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