Motion and Speed Quiz for Class 9

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Questions and Answers

What is the formula to calculate speed?

  • Speed = Time/Distance
  • Speed = Distance - Time
  • Speed = Distance/Time (correct)
  • Speed = Distance x Time

Which of the following is a unit of speed?

  • Kilograms
  • Meters
  • Liters
  • Miles per hour (correct)

What does the speed-time graph of an object moving with constant speed look like?

  • A curve sloping downwards
  • A straight vertical line
  • A curve sloping upwards
  • A straight horizontal line (correct)

What happens to the displacement of an object when its velocity and acceleration are in opposite directions?

<p>The displacement increases (A)</p> Signup and view all the answers

In which scenario can a moving object have a zero acceleration?

<p>Moving with constant speed in a straight line (B)</p> Signup and view all the answers

If an object is in motion and its velocity is decreasing, what can be deduced about its acceleration?

<p>It is positive (A)</p> Signup and view all the answers

What is the relationship between the wind speed and the wind energy in the context of the text?

<p>They are directly proportional (B)</p> Signup and view all the answers

How does the design of a wind turbine affect its efficiency in harnessing wind energy?

<p>The effect of blade size on efficiency varies with wind speed (C)</p> Signup and view all the answers

What is the significance of the tip-speed ratio in wind turbine operation?

<p>Optimal tip-speed ratio is crucial for maximizing power extraction (A)</p> Signup and view all the answers

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