. In which of the following scenarios is work done? *

1 point

A weightlifter holds a barbell overhead for 2.5 sec.

A construction worker carries a heavy beam while walking at constant speed along a flat surface.

A car decelerates while travelling on a flat stretch of road.

A student holds a spring in a compressed position.

2. In which of the following scenarios is no net work done? *

1 pointA car accelerates down a hill.

A car travels at constant speed on a flat road.

A car decelerated on a flat road

A car decelerates as it travels up a hill

3. Which of the following energy form is associated with an object in motion? *

1 point

Choose

This is a required question

4. Which of the following energy form is not involved in hitting a tennis ball? *

1 point

Choose

5. The unit for energy is _____. *

1 point

Choose

6. A stationary object may have _______. *

1 point

Choose

7. Which is the best example that something has kinetic energy? *

1 point

Choose

8. Which one is a conductor of electricity? *

1 point

Choose

9. Which part of an electric circuit supplies energy? *

1 point

Choose

10. In which of the following sentences is work used in the scientific sense of the word? *

1 point

Holding a heavy box requires a lot of work

A scientist works on an experiment in the laboratory

Sam and Rachel pushed hard, but they could do no work on the car

John learned that shovelling snow is hard work

11. Sound is caused by ____. *

12. What medium does sound travel fastest? 

13. Why is sound able to travel faster through a solid medium than a gas? 

Gas molecules are packed tightly

Solid molecules are packed tightly

Sound does not travel faster through a solid than gas

Gas molecules move slowly

14. Sound waves can pass through all of these except? *

15. The resistance of an object to any change in its motion is called ____. *

16. Objects with greater __ also have greater inertia. *

17. Inertia is Newton’s law that states that an object will ___. *

18. A book will not move by itself because it has ____. *

19. When a heavy football player and a light one run into other, who exerts more force? *

20. A bus hits a bug and the bug splatters on the windshield, which force is greater? *

21. Newton’s third law states that, two objects has ______ and _______ reaction. *

22. You hit a wall with a stick. The equal but opposite reaction is _______. *

23. Under the third law of motion, the two forces exerted by two objects on each other act along ________. *

24. Define temperature. *

Temperature is how hot or cold an object is

Temperature is how you feel when you touch an object

Temperature is hotness or coldness of an object

Temperature is the measurement of the degree of hotness of an object

25. Which of the following is used to measure body temperature? *
26. What is the unit for temperature?
27. What happens to the temperature and the liquid level of the thermometer when it is placed in cold water? *

The temperature drops, and the liquid level rises

The temperature rises, and the liquid level rises

The temperature rises, and the liquid level drops

The temperature drops, and the liquid level drops

28. What is the name of the flow of electrons in an electric circuit? *
29. What is the basic unit of electric current? *
30. What is the name of the pressure that forces electrons to flow through a circuit? *

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