Question

9. Categorise transparent, translucent and opaque material among the given
materials.
(Tissue paper, kerosene, wooden plece, clear plastic ruler, tap water, thick colour
plastic lid, drinking glass, diluted milk)
10. a) What are galaxies?
b) Which type of galaxies may contain abundant amount of gas and dust?
11. Write any 4 Characteristics of plastics.
12. Match the following for the flame of a candle.
Column C
Column B
Column A
Innermost zone of
unburnt wax vapour
Hottest part
Bl
(0)
1
ВІ
Middle zone of partial
Ti​

Answer 1

Answer:

9.)

Transparent :-

• Clear plastic ruler
• tap water
• drinking glass

Translucent :-

• Tissue Paper
• diluted milk

Opaque :-

• kerosene
• Wooden piece
• thick color plastic lid

10.)

(a) A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity. ... It's a small part of the Milky Way Galaxy. A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity.

(b) Irregular galaxies may contain abundant amounts of gas and dust. This is not necessarily true for dwarf irregulars. Irregular galaxies are commonly small, about one tenth the mass of the Milky Way galaxy.

(11)  Plastics generally have: resistance to corrosion and chemicals, low electrical and thermal conductivity, high strength-to-weight ratio, colors available in a wide variety and transparent, resistance to shock, good durability, low cost, are easy to manufacture, resistant to water and have low toxicity.

(12)

Explanation: