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9 Questions

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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?

The displacement increases Signup and view all the answers

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

Moving with constant speed in a straight line Signup and view all the answers

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

It is positive Signup and view all the answers

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

They are directly proportional Signup and view all the answers

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

The effect of blade size on efficiency varies with wind speed Signup and view all the answers

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

Optimal tip-speed ratio is crucial for maximizing power extraction Signup and view all the answers