Text Book Back Questions and Answers - Chapter 2 Matter and Materials Term 1 4th Science Guide Samacheer Kalvi Solutions - SaraNextGen [2024-2025]

Updated On May 15, 2024

By SaraNextGen

Chapter 2 - Matter and Materials - Term 1 - 4th Science Guide Samacheer Kalvi Solutions

Text Book Back Questions and Answers
I. Pick out the odd one :
Question $1 .$
brick, coir, silk cloth, pine apple
Answer:
Silk cloth

Question $2 .$
stone, rubber band, cycle tube, electric wire
Answer:
Stone

Question $3 .$
sun, candle, torch, pen
Answer:
Pen

Question $4 .$
umbrella, sponge, rain coat, jerkin
Answer:
Sponge

Question $5 .$
glass bottle, exam pad, paper plate, wooden board
Answer:
Glass bottle

II. Fill in the Blanks :
Question $1 .$
Materials which can be compressed or cut easily are called ______.
Answer:
Soft materials

Question $2 .$
Gold and diamond are the examples of ______ materials.
Answer:
Shiny

Question $3 .$
Materials which can be bent or stretched easily are called ______.
Answer:
Flexible

Question $4 .$

______ objects allow all the light to pass through them.
Answer:
Transparent

Question $5 .$
______ is the natural source that stimulates sight and makes things
Answer:
Light

III. Match the following: (Text Book Page No. 101)
Question 1

IV. Say True or False :
Question $1 .$
We cannot compress, cut or bend the rough materials easily.
Answer:
False

Question $2 .$
Dull materials reflect light.
Answer:
False

Question $3 .$
Sand paper is a good example for smooth materials.
Answer:
False

Question $4 .$
Opaque objects do not allow light to pass through them.
Answer:
True

Question $5 .$
Mirrors change the direction of light that fall on them.
Answer:
True

V. Answer the following questions:
Question $1 .$
When can you say a material is waterproof material?
Answer:
Materials that do not allow water to pass through them are called water proof material. Example: raincoat, aluminium foil of tablet strip.

Question $2 .$
What is a light source?
Answer:
The objects that give off light are called light source.
Example: Sun or sources like an electric lamp or a bulb

Question $3 .$
What is the difference between transparent and opaque materials?
Answer:

Question $4 .$
Define reflection.
Answer:
The bouncing of light by any smooth or polished surface is called

Question $5 .$
Classify the objects given below as transparent, translucent or opaque materials.

Answer:
(Air, Rock, Water, Aluminium foil, Mirror, Snow, Wooden board, Polythene bag, CD, Oil soaked paper, Glass tumbler and Coloured glass).

Intext Questions and Answers
Try to Answer :(Text Book Page No. 95)
Question $1 .$
Look at the pictures and identify the materials by which they are made of : (paper, clay, glass, wood, plastic, metal rubber, wax)

Answer:

Try to Answer :(Text Book Page No. 96)
Question $1 .$
Match the objects that are made of same material

Answer:

1. (a) 1 (b) 3 (c) 2
2. (a) 2 (b) 1 (c) 3
3. (a) 3 (b) 2 (c) 1

Try to Answer :(Text Book Page No. 96)
Write whether the given materials are hard or soft.

Question $1 .$

Answer:

Try to Answer :(Text Book Page No. 97) Sort the given objects as rough or smooth.

Question $1 .$

Answer:

Try to Answer :(Text Book Page No. 97)
Text the flexibility.
Give one plastic scale and wooden scale to the students. Ask them to bend. Tabulate their observation (bends, does not bend).

Question $1 .$

Answer:

Try to Answer :(Text Book Page No. 99)
Write whether the objects are transparent, translucent or opaque.

Question $1 .$

Answer:

Additional Questions and Answers
I. pick out the odd one :
Question $1 .$
Rope, Salt paper, Mirror Ball, Wood
Answer:
Mirror Ball

Question $2 .$
glass, raincoat, aluminum foil, tablet strip
Answer:
Glass

Question $3 .$
candle, mirror, silk cloth, tiles
Answer:
Candle

Question $4 .$
stainless steel, foam, gold, diamond
Answer:
Foam

II. Say True or False:
Question $1 .$
A block of wood is opaque.
Answer:
True

Question $2 .$
A clear window is opaque.
Answer:
False

Question $3 .$
Soft materials can be early compressed.
Answer:
True

Question $4 .$
Smooth materials do not have ups and downs
Answer:
True

III. Match the following:
Question $1 .$

Answer:

1. $-b$
2. $-\mathrm{a}$
3. $-d$
4. $-\mathrm{C}$

IV.Choose the correct answer :
Question $1 .$
Soft material
(a) Rope
(b) Soap
(c) Salt paper
(d) Stone
Answer:
(b) Soap

Question $2 .$
Which material is transparent?
(a) Glass
(b) White plastic
(c) Coir
(d) Snow
Answer:
(a) Glass

Question $3 .$
An object that blocks all of the light from passing through is
(a) Transparent
(b) Clear
(c) Opaque
(d) Translucent
Answer:
(c) Opaque

Question $4 .$
Which among the following is an example of dull material?
(a) Stainless steel
(b) Gold
(c) Candle
(d) Diamond
Answer:
(c) Candle

Question $5 .$
Materials which have ups and and downs on their surface are called.
(a) Smooth material
(b) Rough material
(c) Shiny material
(d) Hard material
Answer:
(b) Rough material

Question $6 .$
Rubber band is an example of
(a) Rough material
(b) Flexible material
(c) Rigid material
(d) Smooth material
Answer:
(b) Flexible material

V. Fill in the blanks:
Question $1 .$

______ through which light can pass partially.
Answer:
Translucent

Question $2 .$

______ through which light can pass completely.
Answer:
Transparent

Question $3 .$

______ through which light cannot pass.
Answer:
Opaque

Question $4 .$
Materials which reflect the light well are called ______.
Answer:
Shiny material

VI. Answer the following questions in one or two sentences:
Question $1 .$
Name some examples for shiny materials?
Answer:
Materials which reflect the light well are called shiny materials.
Example: Stainless steel, gold and diamond.

Question $2 .$
What is material?
Answer:
The matter from which a thing is made of is called Material.
For example: Chair is made of wood, Eraser is made of rubber, Candle is made of wax.

Question $3 .$
Differentiate hard and soft materials.
Answer:

Question $4 .$
What happens when light hits a transparent object?
Answer:
- Transparent objects allow the light to pass through them.
- So, we can see other objects clearly through Transparent Objects.
- Examples: Air, glass and pure water.

Question $5 .$
What is Translucent objects? Give an example.
Answer:
- Translucent objects allow some light to pass through them. So, we cannot see objects clearly, but we see them as blurred images through them.
- Examples: Paper soaked in oil, snow and vegetable oil.

Question $6 .$
What is light sources?
Answer:
- Light may come either from the Sun or from other sources like an electric lamp or a bulb.
- The objects that give off light are called light sources.