Physics Class 9 - Physical Quantities & Kinematics
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Questions and Answers

Which of the following devices are based on the principles of Physics?

  • Television and microwave
  • Fan and light bulb
  • Car and bicycle
  • Computer and smart phone (correct)

    • How has Physics affected our lives?

  • It has made our lives uncomfortable
  • It has no impact on our lives
  • It has made our lives comfortable by developing various technologies (correct)
  • It has made our lives comfortable by developing art and music

    • Why can a screw gauge give more precise length than Vernier calipers?

  • Because it is made of better quality materials
  • Because it uses less energy
  • Because it is larger in size
  • Because it has a smaller least count (correct)

    • What differentiates a mechanical stopwatch from a digital stopwatch?

    <p>Number of buttons/knobs</p> Signup and view all the answers

    What is the primary function of a space shuttle?

    <p>To explore outer space</p> Signup and view all the answers

    What is the purpose of wireless communication?

    <p>To provide internet connectivity in remote areas</p> Signup and view all the answers

    What is the minimum time interval that a digital stopwatch can measure?

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

    Which type of stopwatch is more accurate than the other?

    <p>Digital stopwatch</p> Signup and view all the answers

    When using a measuring cylinder, what precaution must be taken to ensure accurate measurements?

    <p>Keep the eye at the same level as the top of the liquid</p> Signup and view all the answers

    What is the function of balancing screws in a physical balance?

    <p>To balance the pans of the physical balance</p> Signup and view all the answers

    What is the least count of a screw gauge?

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

    What is the range of a paper scale?

    <p>20 cm</p> Signup and view all the answers

    What is the precision level of a ruler, Vernier caliper, and micrometer screw gauge?

    <p>Ruler: 0.1 mm, Vernier caliper: 0.01 mm, Micrometer screw gauge: 0.1 mm</p> Signup and view all the answers

    'Which measurement method is more accurate: measuring with a paper scale or a meter ruler?' What would be a possible misconception that someone may have?

    <p>'The paper scale measurement is more accurate because it can measure in millimeters.'</p> Signup and view all the answers

    What is the pitch of a laboratory screw gauge?

    <p>0.1 mm</p> Signup and view all the answers

    What should be avoided when using a measuring cylinder to measure volume?

    <p>Formation of bubbles inside the cylinder should be completely avoided.</p> Signup and view all the answers

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