8th Grade Mathematics: Geometry Concepts Quiz
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Questions and Answers

What is the name of the point where the three medians of a triangle intersect?

  • Orthocenter
  • Circumcenter
  • Centroid (correct)
  • Incenter
  • Which theorem states that in a right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides?

  • Pythagorean Theorem (correct)
  • Converse of Pythagoras Theorem
  • Fermat's Last Theorem
  • Euclidean Theorem
  • What is the process of creating a trapezium from scratch known as?

  • Construction of a Parallelogram
  • Construction of Trapeziums (correct)
  • Construction of Special Quadrilaterals
  • Construction of a Rectangle
  • In statistics, what is used to represent the distribution of values of a variable?

    <p>Frequency Distribution Table</p> Signup and view all the answers

    Which mathematical concept deals with principles of counting and arrangements?

    <p>Set - Game</p> Signup and view all the answers

    What do we call a number that can be expressed as a fraction, where both the numerator and denominator are integers?

    <p>Rational Number</p> Signup and view all the answers

    What is the formula for the area of a circle with radius $r$?

    <p>$\pi r^2$</p> Signup and view all the answers

    If $x^2 + 5x + 6 = 0$, what is the value of $x$?

    <p>$x = -2, -3$</p> Signup and view all the answers

    What is the value of $\frac{2}{3} \div \frac{1}{6}$?

    <p>12</p> Signup and view all the answers

    If a coin is tossed twice, what is the probability of getting at least one head?

    <p>$\frac{3}{4}$</p> Signup and view all the answers

    What is the mean of the data set: {2, 4, 6, 8, 10}?

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

    Expand the expression $(x + 2)(x - 3)$.

    <p>$x^2 - 5x + 6$</p> Signup and view all the answers

    What is the scientific notation for the number 0.000456?

    <p>4.56 x 10^-4</p> Signup and view all the answers

    Express the number 67,900,000 in scientific notation.

    <p>6.79 x 10^7</p> Signup and view all the answers

    Which of the following is the smallest number when written in standard form?

    <p>1.28 x 10^-7</p> Signup and view all the answers

    If the radius of an atom is approximately $2.5 \times 10^{-10}$ meters, what is its diameter in scientific notation?

    <p>$5 \times 10^{-10}$ meters</p> Signup and view all the answers

    The mass of an electron is approximately $9.11 \times 10^{-31}$ kg. Express this in standard form.

    <p>0.000000000000000000000000000911 kg</p> Signup and view all the answers

    If $2.7 \times 10^8$ bacteria were present initially, and the population tripled every hour, how many bacteria would be present after 5 hours?

    <p>$1.215 \times 10^{11}$ bacteria</p> Signup and view all the answers

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