Science #3 - Energy Test

Question 1

1. Which material is the best conductor of heat
   and electricity?
   A. Wood B. Metal
   C. Stone D. Plastic

Answer 1

B. Metal

Metals such as alluminum, copper, and steel are good thremal conductors because passes throught them quickly. Metals normally feel cold.

Question 2

2. Energy is transferred from the sun to Earth
   mainly by _______________.
   A. Mechanical Waves
   B. Air Currents
   C. Electromagnetic waves
   D. Conduction

Answer 2

C. Electromagnetic waves

Question 3

3. We see the sky as blue because of:
   A. reflection from the ocean
   B. absorption of ultraviolet rays
   C. scattering of blue light waves
   D. diffraction from water in the clouds

Answer 3

C. scattering of blue light waves

Scattering- an interractionof light with matter that causes lightto change direction. Light scatters in all direction.

Question 4

4. The main method of heat transfer occurring within
   water is called ______________.
   A. Conduction B. Convection
   C. Radiation D. Insulation

Answer 4

B. convection

Convection- heat transferred by the circulation or movment of liquids and gasses(fluids).

Question 5

5.Thermal energy is transferred through a material
by the collision of __________ within the material.
A. waves B. atoms
C. crystals D. light

Answer 5

B.atoms

Thermal Energy transfer- thermal energy is tnasferred through a material by the collision of atoms within a material.

Question 6

6. Which of the following waves is not visible to
   the human eye?
   A. red light B. violet light
   C. ultraviolet light D. blue light

Answer 6

C. ultraviolet light

ultra violet light are shorter wave lengths and carry more energy then visible light.

Question 7

7. What kind of energy does a moving baseball
   have?
   A. electrical B. mechanical
   C. magnetic D. chemical

Answer 7

B. mechanical

Mechanical energy transfer- when an object push or pull on on each other.

Question 8

8. Which of the following is the best insulator?
   A. copper B. aluminum
   C. gold D. wood

Answer 8

D. wood

Question 9

9. What is the primary source of energy on Earth?
   A. The Sun B. The Moon
   C. water D. rocks

Answer 9

A. The Sun

The sun is the primary because powers photosyneisi and the water system.

Question 10

10. What form of energy causes an ice cube to melt?
    A. mechanical B. magnetic
    C. sound D. thermal

Answer 10

D. thermal

Thermal Energy Transfer- when a warmer object is in contact with a cooler one.

Question 11

11. When you are riding a bicycle at night, your bicycle’s
    reflectors help people in cars see your bicycle. How do
    bicycle reflectors work?
    A They are made of a special material that gives off its own light.
    B They are hooked up to batteries that allow them to produce light.
    C They bounce light back from other sources.
    D They are covered with paint that glows in the dark.

Answer 11

C They bounce light back from other sources.

Reflection- when light waves bounce of an object.

Question 12

12.In general, metals are ___________________.
A. poor conductors of heat
B. fragile
C. poor conductors of electricity
D. good conductors of heat

Answer 12

D. good conductors of heat

Metals such as alluminum, copper, and steel are good thremal conductors because passes throught them quickly. Metals normally feel cold.

Question 13

13. Heat flows from warm objects to cooler objects
    until both objects are at ___________.
    A. expansion B. equilibrium
    C.thermal D. conduction

Answer 13

B. equilibrium

Thermal equilibrium is when the two object become hte same tempature

Question 14

14. Sunglasses allow some light to pass through.
    The sunglasses are _________________.
    A.transparent
    B.translucent
    C.opaque
    D.insulators

Answer 14

B.translucent

Question 15

15. The change in the direction of a wave when it
    passes from one medium to another is called
    _________________.
    A.Diffraction B. Reflection
    C. Refraction D. Superposition

Answer 15

C. Refraction

Refraction- occurs when light waves bend as they pass through a different medium

Question 16

16. What form of energy causes an ice cube to
    melt?
    A.mechanical B. magnetic
    C. sound D. heat

Answer 16

D. heat

Heat- the transfer of thermal energy between objects of different tempatures.

Question 17

17. What change of state is shown?
    (a pot with steaming water)

A. Liquid to gas B. Solid to gas
C. Gas to liquid D. Solid to liquid

Answer 17

A. Liquid to gas

Question 18

18. Which of the following causes white light to
    separate into the colors of visible light:
    A. Insulation B. Refraction
    C. Absorption D. Infrared Waves

Answer 18

B. Refraction

Refracted Light
Long wavelengths refracted less (like red)
Short wavelengths refracted more (like violet)

Question 19

19. You can see through a car window because it
    is:
    A. Transitional B. Transverse
    C. Opaque D. Transparent

Answer 19

D. Transparent

Question 20

20. Why does the leaf of a plant look green?
    A. Because it absorbs green light
    B. Because it reflects green light
    C. Because it absorbs yellow and blue light
    D. Because it reflects all colors of light

Answer 20

B. Because it reflects green light

Bananas are yellow because the color yellow is reflected off of the bananas All of the other colors of light are absorbed into the bananas.

Question 21

21. Different wavelengths of light are seen as
    different ______________.
    A. Atoms B. Sounds
    C. Speeds D. Colors

Answer 21

D. Colors

Each color travels at a different wavelengths.
The color red has the longest wavelength.
The colot violet has the shortest wavelength.

Question 22

22. What kind of wave can pass through the vacuum
    of empty space?
    A. Conduction wave
    B. Electromagnetic wave
    C. Mechanical wave
    D. Sound wave

Answer 22

B. Electromagnetic wave

Electromagnetic wave can transmit energy through matter or empty space
eg. sunlight

Question 23

Sound wave
23. Each of the following is an example of light
interaction, except:
A. Compression B. Reflection
C. Transmission D. Absorption

Answer 23

A. Compression

Question 24

24. We can see the moon because:
    A. The moon reflects light from the sun
    B. The moon is a light source
    C. The moon emits and reflects light
    D. The moon reflects light from the earth

Answer 24

A. The moon reflects light from the sun

When do you see light?

The object must be a source of light
eg. the sun

Light must bounce of the object
eg. the moon

Question 25

25. The diagram below shows an incomplete electrical circuit that includes a battery, a bulb, 2 wires labeled A and B. The bulb is not lit. What should be done in order to light the bulb and complete the circuit? A. Change the battery. B. Remove the bulb. C. Connect wire A to the battery. D. Connect wires B to the bulb. ## Footnote The photo has an elctical circut and everything is in place, but wire B is not connected.

Answer 25

D. Connect wires B to the bulb. ## Footnote Electrical Energy Transfer- when an electrical soureis connected in a complete circut to an elcetrical deivice.

Question 26

26. Conduction involves heat transfer through direct contact

Answer 26

True ## Footnote Conduction- heat transfered when two object touch (soilds).

Question 27

27. Rainbows are caused by absorption.

Answer 27

False ## Footnote Refracted Light Long wavelenghts(red) relfected less Short wavelengths(violet) relected more

Question 28

28. Light from the sun provides heat and energy.

Answer 28

True ## Footnote The sun is the primary source of energy for the earth, powering photoseiysis, and the water cycle

Question 29

29. Black objects reflect all colors.

Answer 29

False ## Footnote A black shirt absorbs all wavelengths and turning it into heat. A white shirt reflects all wavelengths.

Question 30

31. Infrared rays are emitted by all warm bodies.

Answer 30

True ## Footnote Infared waves- carry less energy than visible light and are longer wavelengths.

Question 31

32. All colors of light combine to make white.

Answer 31

True ## Footnote A white shirt reflects all wavelengths.

Question 32

33. Violet light waves are longer and so carry less energy than red light waves.

Answer 32

False ## Footnote Each color travels at a different wavelengths. The color red has the longest wavelength. The colot violet has the shortest wavelength.

Question 33

34. Thermal energy is always transferred from colder objects to warmer objects.

Answer 33

False ## Footnote Thermal Energy Transfer Thermal energy is always transferred from warmer objects to cooler objects.

Question 34

35. Heat travels through solids primarily by radiation.

Answer 34

False ## Footnote Conduction workd best in solids ( land and metals)

Question 35

Can light waves travel through empty space? Why is this important? (For full credit, write in complete sentences. Worth up to 5 points)

Answer 35

My Answer Light can travel through empty space through radiation in the form of electromagnetic waves. This is important because without radition we could not live. Since radtion is what heats the earth. Since the way the sun heat reaches the earth is through radiation. Also, raditoin powers photosotheis and the water cycle. *life would not exisit** The Correct Answer Light waves travel through empty space as electromagnetic waves. This is very important because if light could not travel through empty space, light from the sun would never reach earth. Light from the sun is responsible for powering the water cycle as well as photosynthesis. Life would not exist without light.