skill bulider
Presentation
•
Science
•
3rd Grade
•
Hard
RIMSHA KERKAR
FREE Resource
7 Slides • 4 Questions
1
skill bulider
2
Light and Sound
3
Recap and apply the concept to answer the questions.
4
LIGHT
Sources of light
All sources of light can be classified as Natural sources and Artificial sources of Light.
Natural light
Eg: Sun, Firefly, stars
Artificial light
Eg: Bulb, lamp, candle
Objects can be classified as Luminous and Non-Luminous Objects
5
Transparent , Translucent and Opaque
Objects are classified as transparent, opaque and translucent based on how much light they allow to pass through them.
TRANSPARENT OBJECTS
Eg:- clear glass, clean air, clean water
TRANSLUCENT OBJECTS
Eg:- tissue paper, butter paper, frosted glass
OPAQUE OBJECTS
Eg:- wood, metal, wall
6
SHADOW
Shadows are formed when objects block the path of light.
Shadows are always formed in the opposite direction of the light.
Length of the shadow depends on the position of the source of light.
7
SOUND
The sounds that we make may be pleasant or unpleasant.
Sound is made when an object vibrates
8
Multiple Choice
1.The object shown here, does not cast a clear shadow. It is most likely made of __________________ material.
A. metal
B. Wood
C. clear plastic sheet
D. rubber
9
Multiple Choice
Strings of a guitar are pulled to create vibrations. What do vibrations produce?
Colour
Sound
Light
Force
10
Multiple Select
Look at the picture. Some birds have feet that help to hold on to branches tightly and sit on them. Identify these birds (Select all correct answers)
Pigeon
Penguin
Parrot
a.Pelican
11
Multiple Select
Study the given Venn diagram and select the correct options regarding it.
X is parrot
Y is woodpecker
W is duck
Z is heron
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