Grade 7 Science Term Review: Methods, Quantities, Force & Motion
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Questions and Answers

Which of the following is an example of a non-contact force?

  • Muscular force
  • Weight
  • Friction
  • Gravity (correct)

    • How can friction be increased?

  • Increase the weight of the objects in contact (correct)
  • Decrease the normal force between surfaces
  • Decrease surface roughness
  • Apply lubricants

    • What is the correct definition of mass?

  • The gravitational pull on an object
  • A measure of the force of gravity on an object
  • The resistance encountered when one body tries to slide over another
  • A measure of the amount of matter in an object (correct)

    • What force takes place when a bullet is fired from a pistol?

    <p>Air resistance</p> Signup and view all the answers

    Which of the following is a base quantity among the 7 base quantities mentioned in the text?

    <p>Electric current</p> Signup and view all the answers

    How does a car moving at a steady speed demonstrate Newton's first law?

    <p>By maintaining constant velocity without any net external force</p> Signup and view all the answers

    What category do quantities like height and depth fall under based on the text?

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

    A derived quantity is expressed using:

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

    What type of quantity does not need other quantities to be expressed according to the text?

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

    Which of the following is an example of a derived quantity mentioned in the text?

    <p>$Area ( l×b )$</p> Signup and view all the answers

    How many fundamental or base quantities are there according to the text?

    <p>7</p> Signup and view all the answers

    What is the purpose of purification methods in science?

    <p>To separate mixtures into pure substances using physical methods</p> Signup and view all the answers

    Which method is suitable for separating an insoluble solid from a liquid?

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

    What is the purpose of a filter paper in the process of filtration?

    <p>To trap the solid particles</p> Signup and view all the answers

    In filtration, what is the pure substance that passes through the filter paper called?

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

    Which of the following is NOT a method of purification according to the text?

    <p>Chemical reactions</p> Signup and view all the answers

    What type of substances can be separated by purification methods?

    <p><strong>Mixtures</strong> into pure substances</p> Signup and view all the answers

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