
BOOK 8 Unit 12:LIGHT
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Science
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8th Grade
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Medium
izatul nadia
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21 Slides • 16 Questions
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BOOK 8 Unit 12:LIGHT
Revision
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Let's Test your understanding
Lesson 1 : Light is travelling in straight line
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Multiple Choice
The visible light is composed of several spectral of colors with different frequencies and wavelength. What is the correct order of arrangement of these colors?
a. VIGBYOR
b. ROYGVIB
C. ROYGBIV
d.ROYBGIV
5
Multiple Choice
A straight glass rod appears to bend when placed in a beaker of water. What is the best explanation for this phenomenon?
a.The water is warmer than the air
b.Light travels faster in water than in air
c.Light is reflected at the air-water interface
d.Light is refracted as it crosses at the air- water interface
6
Multiple Choice
Which color in the visible light has the lowest frequency and the least energy?
a. Red
b. Violet
c. Blue
d. Orange
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Multiple Choice
Which color in the visible light has the highest frequency and the most energy?
a.Violet
b. Red
c. Blue
D. indigo
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Fill in the Blanks
c- When light rays fall on a rough surface, they are
Type answer...
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Multiple Choice
The ray of light that strikes a mirror is called ________
an incident ray
a reflected ray
a normal ray
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Multiple Choice
The Law of reflection states that - The angle of incidence is .................. the angle of reflection
equal to
double
half
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Multiple Choice
4. If the angle of incidence is 45 degree, what is the angle of reflection?
90°
45°
180°
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Multiple Choice
3. The angle between the reflected ray and the normal line is called the:
Angle of incidence
Angle of reflection
angle of convergent
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Multiple Choice
2. The imaginary line perpendicular to the mirror is called the
Incident ray
reflected ray
normal line
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Multiple Choice
A _________ forms when the path of light is blocked.
sun
circle
line
shadow
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Multiple Choice
A copy of an object formed by reflected or refracted rays of light
image
regular reflection
reflection
diffuse reflection
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Multiple Choice
Why can you see most objects?
they emit light
light refracts through them
light reflects off them
They absorb light
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Multiple Choice
a. Objects that give off their own light is called __________
non luminous
Opaque
luminous
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Multiple Choice
a. Objects that do not give off their own light is called __________
opaque
non luminous
luminous
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Multiple Choice
c -Moon is an example of the ________________ objects.
non luminous
None of them
luminous
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Well Done
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BOOK 8 Unit 12:LIGHT
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