Grade 10 Objective 5

1. Grade 10 Objective 5

2. 1 What is the average speed of a jet plane that flies 8000 kilometers in 8.5 hours? A 471 km/h B 941 km/h C 8009 km/h D 68,000 km/h

3. 2 How much force is needed to accelerate a 1,300 kg car at a rate of 1.5 m/s2? F 867 N G 1,950 N H 8,493 N J 16,562 N

4. 3 A car traveled 150 km in 2.5 hours. What was its average speed in km per hour? Record and bubble in your answer on the answer document.

5. 4 The diagram represents the total travel of a teacher on a Saturday. Which part of the trip is made at the greatest average speed? F Q G R H S J T

6. 5 Which bike rider has the greatest momentum? A A 40 kg person riding at 45 km/h B A 50 kg person riding at 35 km/h C A 60 kg person riding at 25 km/h D A 70 kg person riding at 15 km/h

7. 6 An ant crawled from Point A to Point B in 4.0 seconds. To the nearest tenth, what was the ant’s speed in centimeters per second?

8. 7 A driver traveled 270 km in 3 hours. The driver’s destination was still 150 km away. What was the driver’s average speed at this point? A 40 km/h B 90 km/h C 140 km/h D 420 km/h

9. 8 A person pushes a large box across a level floor by applying a horizontal force of 200 N. If the person pushes the box a distance of 5 meters in 10 seconds, how much work does the person do on the box? A 2000 joules B 1000 joules C 400 joules D 100 joules

10. 9 Which graph can represent an object at rest? F H G J

11. 10 Safety restraints in cars help prevent passenger injuries that would otherwise occur as a result of passengers remaining in motion during a car’s abrupt stop. Which of these laws predicts that an unrestrained moving body will continue to move? A Law of inertia B Law of reflection C Law of universal gravitation D Law of conservation of momentum

12. 11 The table shows times required for the same toy car to travel 10 m across an identical section of a floor after it is pushed. The difference in times was probably caused by differences in — A force exerted B surface friction C air resistance D car mass

13. 12 The illustration above shows a student about to throw a ball while standing on a skateboard. Which illustration below correctly shows the skateboard’s direction of motion after the student releases the ball? A B C D

14. 13 What would be the wavelength in centimeters of this wave if its frequency were doubled?

15. 14 At 0°C sound travels through air at a speed of 330 m/s. If a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency? F 0.0033 Hz G 33 Hz H 330 Hz J 3300 Hz

16. 15 Which illustration best demonstrates compression waves?

17. 16 Which label on the model represents a wavelength? F Q G R H S J T

18. 17 What type of energy is stored in a piece of firewood? A Geothermal energy B Kinetic energy C Chemical energy D Radiant energy

19. 18 Fuel cells powered by plankton from the seabed can be used to operate instruments that monitor ocean currents and water temperature. These fuel cells get their energy by converting — F chemical energy to electrical energy G electrical energy to mechanical energy H hydroelectric energy to geothermal energy J mechanical energy to chemical energy

20. 19 Which of these best explains why skin is warmed by radiant energy? A Sunlight absorbed by the skin increases the skin’s thermal energy. B High-frequency radiant energy is composed of waves with short wavelengths. C Uneven heating produces convection currents within the skin. D Atoms with loosely held electrons transmit heat by conduction.

21. 20 The primary way liquids and gases transmit heat is by the process of — F reflection G conduction H radiation J convection

22. 21 A man who was sleeping wakes up because he hears the smoke alarm go off in his house. Before opening the bedroom door, the man feels the door to see whether it is warm. He is assuming that heat would be transferred through the door by — A conduction B convection C radiation D compression

23. 22 In winter the air just above the top bunk of a bunk bed is warmer than the air just above the bottom bunk because warm air rises. Which of the following describes the method of heating that causes this difference in temperature? F Radiation from the room G Heat transfer through the walls H Convection currents in the room J Heat conduction through the bed

24. 23 Which of these is the best example of heat transfer by radiation? A A satellite is warmed by sunlight. B Butter melts on warm bread. C A ceiling fan cools a warm room. D Puddles of water cool a warm tile floor.

25. 24 The circuit above can be made into a closed-series circuit that will light both bulbs by touching the loose wire to Point — A Q B R C S D U

26. 25 Which switch, if opened, will cause the lightbulb to stop glowing? F Q G R H S J T

27. 26 What is the current in a copper wire that has a resistance of 2 ohms and is connected to a 9-volt electrical source? F 0.22 amp G 4.5 amps H 11.0 amps J 18.0 amps

28. 27 How much current is flowing through this circuit? A 0.32 A B 3.1 A C 4.0 A D 12.5 A

29. 28 Which circuit is built so that if one lightbulb goes out, the other three lightbulbs will continue to glow?

30. 29 In this circuit, how much current flows through the lightbulb? A 0.75 amp B 1.50 amps C 2.0 amps D 3.0 amps

31. 30 The bulb will light when a current supplied by at least one 1.5 V battery is available. Which circuit will fail to light the bulb? A C B D

32. Grade 10 Objective 5 Answer Key