12. Sound travels fastest through which of these materials?
B. empty space
C. metal
D. water
A. air
13. What is frequency?
A. the number of vibrations per second
B. how high or low a sound is
C. the loudness or softness of a sound
D. the back and forth movement of matter
14. Sound is a form of
A. pitch
B. energy
C. volume
D. matter
A. gas
15. What medium does sound travel through slowest?
B. solid
C. liquid
D. trees
16. Which of the following is an example of heat conduction?
A. An air vent from a furnace sending hot air into the house.
B. A metal cup heating up when hot water is poured into it.
C. The sun melting the ice formed on a frosty lawn.
D. Cool air sinking to the ground on a cold night.
17. Which is the best activity to help keep a home cool in the summer?
A. Open the refrigerator often.
B. Turn off the television, radios and computers.
C. Open the windows during the day.
D. Close the shades where the sun is shining.
18. What happens to the light particles when light hits an uneven surface.
A. They are reflected off in a straight line.
B. They are scattered in many directions.
C. They are absorbed by the surface.
D. They pass through the surface.
19. Why do you see your image in a mirror?
A. Light is reflected.
C. Light is absorbed.
B. Light is refracted.
D. Light is diffused.
20. Which of the following is an example of a light reflector?
A. the planet Mars B. lightning C. exploding fireworks
D. stars
21. What is a simple machine that uses grooved wheels and a rope to raise, lower, or
move a load?
A. Lever
B. inclined plane C. wheel and axel D. pulley
22. What simple machine uses a wheel with a rod or rods through its center that will help it
lift or move a load? A. inclined plane B. wheel and axle C. screw D. all of the above
23. A fork would be an example of what type of simple machine?
A. Pulley
B. wedge C. lever
D. screw
24. What type of simple machine would be the bottom of a light bulb be?
A. Screw
B. wedge C. lever
D. pulley
25. What type of simple machine is a seesaw on a playground?
A. inclined plane B. pulley C. wedge
D. lever
B. empty space
C. metal
D. water
A. air
13. What is frequency?
A. the number of vibrations per second
B. how high or low a sound is
C. the loudness or softness of a sound
D. the back and forth movement of matter
14. Sound is a form of
A. pitch
B. energy
C. volume
D. matter
A. gas
15. What medium does sound travel through slowest?
B. solid
C. liquid
D. trees
16. Which of the following is an example of heat conduction?
A. An air vent from a furnace sending hot air into the house.
B. A metal cup heating up when hot water is poured into it.
C. The sun melting the ice formed on a frosty lawn.
D. Cool air sinking to the ground on a cold night.
17. Which is the best activity to help keep a home cool in the summer?
A. Open the refrigerator often.
B. Turn off the television, radios and computers.
C. Open the windows during the day.
D. Close the shades where the sun is shining.
18. What happens to the light particles when light hits an uneven surface.
A. They are reflected off in a straight line.
B. They are scattered in many directions.
C. They are absorbed by the surface.
D. They pass through the surface.
19. Why do you see your image in a mirror?
A. Light is reflected.
C. Light is absorbed.
B. Light is refracted.
D. Light is diffused.
20. Which of the following is an example of a light reflector?
A. the planet Mars B. lightning C. exploding fireworks
D. stars
21. What is a simple machine that uses grooved wheels and a rope to raise, lower, or
move a load?
A. Lever
B. inclined plane C. wheel and axel D. pulley
22. What simple machine uses a wheel with a rod or rods through its center that will help it
lift or move a load? A. inclined plane B. wheel and axle C. screw D. all of the above
23. A fork would be an example of what type of simple machine?
A. Pulley
B. wedge C. lever
D. screw
24. What type of simple machine would be the bottom of a light bulb be?
A. Screw
B. wedge C. lever
D. pulley
25. What type of simple machine is a seesaw on a playground?
A. inclined plane B. pulley C. wedge
D. lever
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Answer:
12. C. metal
13. A. the number of vibrations per second
14. B. energy
15. none of the above
16. B. A metal cup heating up when hot water is poured into it.
17. D. Close the shades where the sun is shining.
18. B. They are scattered in many directions.
19. A. Light is reflected.
20. B. lightning
21. D. pulley
22. B. wheel and axle
23. B. wedge
24. A. Screw
25. D. lever
Explanation:
12. The speed of sound depends on the medium in which it is transported. Sound travels fastest through solids, slower through liquids and slowest through gases. metal is solid.
13. the rate at which a vibration occurs that constitutes a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light), usually measured per second.
14.Sound is a form of energy, just like electricity and light. A sound is made when air molecules vibrate and move in a pattern called waves, or sound waves.
15. Of the three mediums (gas, liquid, and solid) sound waves travel the slowest through gases, faster through liquids, and fastest through solids. Temperature also affects the speed of sound.
16. Heat conduction (or thermal conduction) is the movement of heat from one object to another one that has different temperature when they are touching each other.
17. Placing blinds, curtains, or reflective window panels are some of the ways how to keep the sun out of windows. Keeping direct sunlight away from your room will reduce the warmth in the space.
18. For a rough surface, reflected light rays scatter in all directions. This is called diffuse reflection. Diffuse reflection is when light hits an object and reflects in lots of different directions. This happens when the surface is rough.
19. An image can be seen in the mirror because the light reflected from an object falls on the mirror and it is reflected.
21. A pulley is a simple machine that uses grooved wheels and a rope to raise, lower or move a load.
22. The wheel and axle is another simple machine. It uses a wheel with a rod attached in the middle as an axle to help it to lift or move loads.
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