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

 

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

Samacheer Kalvi 4th Science Guide  Matter and Materials Text Book Back Questions and Answers

I.Pick out the odd one :

Evaluation

1. brick, coir, silk cloth, pine apple

2. stone, rubber band, cycle tube, electric wire

3. sun, candle, torch, pen

4. umbrella, sponge, rain coat, jerkin

5. glass bottle, exam pad, paper plate, wooden board

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.

1. Light source - Glass 

2. Waterproof - Vegetable oil

3. Transparent - Sun  

4. Translucent - Metal  

5. Opaque - Rain coat

III  Match the following.

1. Light source - Sun

2. Waterproof - Rain coat

3. Transparent - Glass

4. Translucent - Vegetable oil

5. Opaque - Metal

IV Say True or False.

1. We cannot compress, cut or bend the rough materials easily. False

2. Dull materials reflect light. False

3. Sand paper is a good example for smooth materials. False

4. Opaque objects do not allow light to pass through them. True

5. Mirrors change the direction of light  that fall on them. 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 reflection

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

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

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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)

Try to Answer :(Text Book Page No. 96)

Question 1.

Match the objects that are made of same material

Try to Answer :(Text Book Page No. 97)

Sort the given objects as rough or smooth.

Question 1.

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.

Try to Answer :(Text Book Page No. 99)

Write whether the objects are transparent, translucent or opaque.

Question 1.

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