🌞 LIGHT, SHADOW & ECLIPSES 🌑
All Exercises Answer - In Easy Language
A. Tick The Correct Option ✓
1. Natural source of light? ✓ i. Sun
2. Light is a form of ✓ ii. energy
3. Translucent object? ✓ i. Tracing paper
4. Rotation causes ✓ iii. day and night
5. Solar eclipse shadow cast on ✓ iii. earth
B. Fill In The Blanks
1. Light travels in a straight line
2. Translucent objects allow light partially
3. Shadows are shortest in the noon
4. A lunar eclipse occurs when earth is between sun and moon
5. Earth takes 24 hours to complete one rotation
C. Match The Following
| Name | Match |
|---|---|
| Transparent | iii. glass |
| Opaque | iv. wood |
| Shadow | v. black |
| Rotation | ii. spins on axis |
| Revolution | i. moves around sun |
D. True / False
1. Sun is artificial source F
2. We can see through opaque F
3. Rotation & Revolution are movements T
4. Position of shadows are different T
5. Rotation causes seasons F
E. Activity - Bigger Shadow
Que: Where to keep ball to get bigger shadow?
Ans: Keep the ball close to the bulb. Near light = Big shadow, Far from light = Small shadow.
F. Long Answers - In Easy Language
1. What is light? Types of light sources?
Light is a form of energy that helps us to see. Two types: Natural - Sun, Stars. Artificial - Bulb, Torch, Candle.
2. Difference: Transparent, Translucent, Opaque
Transparent: Full light passes, clear see. Eg. Glass
Translucent: Little light, blurry see. Eg. Tracing paper
Opaque: No light passes. Eg. Wood, Book
Translucent: Little light, blurry see. Eg. Tracing paper
Opaque: No light passes. Eg. Wood, Book
3. What is shadow & its conditions?
Dark area formed behind opaque object when light falls on it.
Need 3 things: 1) Light source 2) Opaque object 3) Screen/surface.
Need 3 things: 1) Light source 2) Opaque object 3) Screen/surface.
4. Define Rotation. Why important?
Earth spins on its own axis - called Rotation. Takes 24 hours. Important because it causes Day and Night.
5. How Revolution is different from Rotation?
Rotation: Spins on own axis, 24 hrs, causes Day/Night.
Revolution: Moves around sun in fixed orbit, 365 days 6 hrs, causes Seasons.
Revolution: Moves around sun in fixed orbit, 365 days 6 hrs, causes Seasons.
💡 Remember: Shadows longest in morning/evening, shortest at noon! 💡
Light Chapter | Class Science | Blogger Ready Code | Easy Language
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