Class 7 Science Chapter 13 Motion and Time Exercise Solutions
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Questions and Answers

Which type of motion does the motion of your hands while running represent?

  • Random motion
  • Oscillatory motion (correct)
  • Circular motion
  • Straight line motion

    • What type of motion does the horse pulling a cart on a straight road represent?

  • Oscillatory motion
  • Straight line motion (correct)
  • Circular motion
  • Random motion

    • What type of motion does a child in a merry-go-round experience?

  • Random motion
  • Oscillatory motion
  • Straight line motion
  • Circular motion (correct)

    • What type of motion does the hammer of an electric bell exhibit?

    <p>Oscillatory motion</p> Signup and view all the answers

    Which type of motion does the child on a see-saw experience?

    <p>Oscillatory motion</p> Signup and view all the answers

    What type of motion does a train on a straight bridge exhibit?

    <p>Straight line motion</p> Signup and view all the answers

    What is the basic unit of time?

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

    What determines the time period of a pendulum?

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

    What is the speed of a train typically expressed in?

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

    What is the time period of a simple pendulum that takes 32 seconds to complete 20 oscillations?

    <p>$3.2$ s</p> Signup and view all the answers

    What is the speed of a train that takes 4 hours to cover a distance of 240 km?

    <p>$60$ km/h</p> Signup and view all the answers

    If the odometer reading changed from 57321.0 km to 57336.0 km in 20 minutes, what is the speed of the car in km/min during this time?

    <p>$0.6$ km/min</p> Signup and view all the answers

    How far is Salma's school from her house if she takes 15 minutes to reach her school on a bicycle with a speed of 2 m/s?

    <p>$1.8$ km</p> Signup and view all the answers

    What does the distance-time graph look like for a car parked on a side road?

    <p>Horizontal line at y-axis</p> Signup and view all the answers

    What is the purpose of a safety pin in an electrical circuit?

    <p>To represent a switch in the 'OFF' position</p> Signup and view all the answers

    Why is the bulb in the given circuit not glowing?

    <p>The two cells are not connected properly</p> Signup and view all the answers

    In the context of electrical circuits, what does a safety pin symbolize?

    <p>A switch in 'OFF' position</p> Signup and view all the answers

    What component of an electrical circuit does a battery symbolize?

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

    What is the function of connecting wires in an electrical circuit?

    <p>To establish connections between components</p> Signup and view all the answers

    What does a bulb symbolize in an electrical circuit diagram?

    <p>Component that produces light</p> Signup and view all the answers

    Which of the following is a correct statement about making a battery of two cells?

    <p>The negative terminal of one cell is connected to the positive terminal of the other cell.</p> Signup and view all the answers

    What happens when the electric current through the fuse exceeds a certain limit?

    <p>The fuse wire melts and breaks.</p> Signup and view all the answers

    What does an electromagnet do when a piece of iron is brought near it?

    <p>It attracts the iron.</p> Signup and view all the answers

    What component does an electric bell have?

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

    What is the safety device based on the heating effect of electric current called?

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

    Which effect of electric current is utilized in a room heater?

    <p>Heating effect</p> Signup and view all the answers

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