Exercises.
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Light, Shadows and Reflections
Given below is the notes of Chapters "Sorting Materials".
Fill in blanks.
1. Grouping of substances on the basis of their properties is called classification.
2. Metals like gold and copper have lustre.
3. Metal Sheet is an opaque object while glass is a transparent object.
4. Insoluble substances does not dissolve in water.
5. Liquids that dissolve in water are said to be miscible
6. Transparent materials allow the light to pass through them.
B. Multiple Choice questions.
1. Which of this flats on water?
ans. rubber ball
2. A material through which light cannot pass at all is
ans. Opaque
3. Butter paper is
ans. translucent
4. Which of the following is insoluble in water?
ans. oil
5. Which property does a jeweller consider hile choosing metal for jewellery?
ans. lustre.
C. Very short answer questions (one word)
1. Name one translucent material.
ans. oiled paper.
2. cotton is soft material.
ans. True
3. Name one solid soluble in water.
ans. Salt
4. Name one liquid soluble in water
ans. methanol
5. Name one gas soluble in water.
ans. oxygen.
6. Name one rough material
ans. plywood
7.Name one non-lustrous object
ans. wood
8. Property of an object to float or sink.
ans. Balanced weight force.
D. Short answer questions.
a. Make a list of four materials. Name one thing that is made from each of these.
ans. List of four materials.
Wood- Chair
Plastic- bucket
Metal- Pen
Stainless Steel- Knife.
2. How are soft materials different from hard materials? Give two examples of each.
ans. Soft materials which can be compressed or scratched easily while hard materials cannot be compressed easily. cotton, silk are true example of soft materials while iron, glass are example of hard materials.
3. What are miscible and immiscible liquids? Give two examples of each.
ans. Miscible: Liquids that are soluble in water are said to be miscible in water. Glycerine and ethanol are the examples of miscible liquids
Immiscible: Liquids that are not soluble in water are said to be immiscible in water. For example oil and water.
3. What is importance of classification of materials?
ans. Classification of materials are important for the following reasons:
(i) Classification of materials makes it convenient to study their properties.
(ii) It makes it convenient to locate objects.
5. Define:
(a) Properties of a substance:
ans. Special features of substance or material that distinguish it from other substances. The features include appearance, lustre, hardness, rough or smooth, soluble or insoluble, transparency, gases in water etc.
(b) Classification:
ans. grouping of substances or materials on the basis of similarities and dissimilarities between different materials.
(c) Lustre
It is the shine of materials. Usually metals like gold, silver, copper and aluminium are lustrous.
(d) Floatation
Properties of a substance to float or sink in water. It is called floatation.
E. Long answer questions.
1. Difference between transparent, translucent and opaque materials
ans. Transparent Materials:
Substances through which light can pass or through which things can be seen are called transparent materials. For example glass
Translucent Materials:
Substances through which light can pass but only partially and things are not seen clearly through them. They are called translucent materials. Oiled paper and frosted glass.
Opaque Materials:
Substances through which light cannot pass or through which things cannot be seen. For example metal sheet card board.
2. What happened when common salt, sugar, cooking oil and kerosene oil are added to water? Write it in the form of an activity with proper observations and conclusion.
ans. Salt, sugar, cooking oil and kerosene oil are added to water
If the substances like salt, sugar water and cooking oil and kerosene oil are added to water the following things can be seen
Salt, sugar:- They get dissolved in water. Thus we conclude that they are soluble
Cooking oil and Kerosene: They don't get dissolved in water. Even if we stir them hard in water, they break up with small droplets. This means they are immiscible in water.
The Next Chapter.
The Living Organisms and Their Surroundings
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