Class 5 Basic Science Chapter 03 Celestial Shadow Sights - Questions and Answers | Teaching Manual


Textbooks Solution for Class 5th Basic Science (English Medium) അദ്ധ്യായം 03 മാനത്തെ നിഴൽക്കാഴ്ച്ചകൾ | Text Books Solution Basic Science (English Medium) Chapter 03 Celestial Shadow Sights | ഈ യൂണിറ്റിന്റെ Teaching Manual, Teachers Handbook എന്നിവ താഴെയായി നൽകിയിട്ടുണ്ട്, Download ചെയ്യാം.

Chapter 03: Celestial Shadow Sights
Celestial Shadow Sights - Textual Questions and Answers & Model Questions
1. What are transparent objects?
Answer: Objects which allow light to pass through them completely are transparent objects.
Example: Plain glass, plastic sheets, water, air etc.

2. What are opaque objects?
Answer: Objects which do not allow light to pass through them are opaque objects.
Example: cardboard, books, tiles, wood etc.

3. What are translucent objects?
Answer: Objects which allow light to pass through them partially are translucent objects.
Example: ground glass, tissue, wax paper, oilpaper etc.

4. Are all solid substances opaque?
Answer: No, some solids are opaque and others are transparent. 

5. Aren't their transparent liquids?
Answer: Yes, there are transparent liquids.
Example:- Pure water, pure coconut oil and glycerin.

6. Aren't their opaque liquids?
Answer: Yes, but very few, Most liquids are transparent or translucent.
Example:- milk

7. Aren't their translucent liquids?
Answer: There are translucent liquids.
Example:- Sodas

8. Aren't gases generally transparent?
Answer: Yes, all gases are generally transparent. Such as Oxygen and Nitrogen.

9. How do we make use of the transparency and opacity of objects in daily life?
Answer: Transparent objects are used to make packed mineral water bottles, mirrors, tube lights. Opaque objects are used in objects to keep out the heat, sunlight, and UV rays.

10. If air, glass pieces etc. were opaque.........
Answer: Blurred version

11. What if the earth were transparent?
Answer: Night will not happen on the earth

12. The use and need of opaque substances in daily life.
Answer: Doors, walls, paper, clothes.

13. How the solar eclipse is formed?
Answer: When the moon comes between the earth and the sun in a straight line, the earth comes in the shadow of the moon. Then the shadow of the moon falls on the earth. The sun cannot be seen from the area where the shadow falls. This is the solar eclipse.
14. Is it at night or during the day that the solar eclipse becomes visible?
Answer: Day time

15. How the lunar eclipse is formed?
Answer: When the earth comes between the sun and the moon in a straight line. The moon then comes in the shadow of the earth and will be invisible. This is a lunar eclipse.

16. Does the lunar eclipse occur at night or during the day?
Answer: Nighttime

17. Identify the positions of the Earth, the Sun and the Moon during the Lunar Eclipse?
Answer: Sun, Earth, Moon

18. Gracy and Mujeeb are trying to observe the flame of a burning candle
through pipes. Who will be able to view the flame? Why?
Answer: Mujeeb can see the flame. Because light travels only in a straight line.

19. Classify the following objects into those that cast shadows and those
which do not. Explain why. 
Glasspaper, cardboard, wooden plank, glass sheet, tiles, air.
Answer:
Cast shadows - cardboard, wooden plank, tile
Doesn't cast shadows - Glasspaper, glass sheet, air
Transparent objects allow light to pass through them completely.
Opaque objects do not allow light to pass through them.

20. Deepu is of the opinion that solar and lunar eclipses occur because the
earth and the moon are opaque. Do you agree with this? Explain.
Answer: Yes, Solar eclipse takes place when the shadow of the moon falls on the earth. The lunar eclipse takes place when the shadow of the earth falls on the moon. Opaque objects only form shadows.

21. “Viewing an eclipse is dangerous” This is the title of a news item In a newspaper regarding an eclipse. Which eclipse is this news related to? Can you suggest ways to view the eclipse safely?
Answer:
* Solar eclipse
* It should be viewed only by using solar filters or using the reflection or the transmission method.
* Use eclipse glasses to view the eclipse
* Use hand-held solar viewers to view the eclipse


23. Celestial Shadow Sights  - Teachers Handbook - Click here
 




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