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Question 1 VERY SHORT TYPE OF QUESTIONS: [1-2 marks]
(i).Name one material that float on kerosene?
(ii).Give one example of shining object.
(iii).Name two gases which are soluble in water.
(iv).Name two materials which are soft.
(v).List the materials which make a pen.
(vi).Define non-metal. Answers
i. Match stick
ii. Silver spoon
iii. Oxygen and carbon dioxide
iv. Cotton and sponge
v. Plastics, metal
vi. Elements that lack the properties of metal such as hardness, conducting heat & electricity, lusture. They are generally not solid in room temperature.
Question 2 SHORT TYPE OF QUESTIONS: [2-3 marks]
i.What do you understand by the term miscible liquids? Give one example of it.
ii.Why water is called universal solvent? Name a gas that is insoluble in water.
iii.List any two properties of materials.
iv.What kind of materials are said to be opaque? Give on example.
v.Define the term diffusion.
vi.List three general characteristics of metal.
vii.What is homogeneous mixture? Give one example Answers
i. The liquids which dissolve in water are called miscible liquids. Example milk.
ii. Water can dissolve large number of materials and hence it is called universal solvent. Nitrogen gas is insoluble in water.
iii. Hardness and soluble or insoluble.
iv. The materials through light does not pass and we are unable to see through it. Example wood.
v. Diffusion is the movement of molecules from a region of high concentration to a region of low concentration.
vi.
a.Metals are generally good conductors of heat and electricity.
b.solid in room temperature.
c.shine brightly when polished.
vii.A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample. Eg: Sugar syrup
Question 3 SHORT ANSWER TYPE QUESTION [2-3 MARKS]
i.There are thousands of items in a grocery shop. Yet how the shopkeepers deliver the items so quickly.
ii.Differentiate between naturally occurring and man-made materials.
iii.How do aquatic plants and animals survive in water? What do you understand by the term solubility?
iv.Define matter. Name the three states of matter.
v.Classify the following as transparent, translucent and opaque.
Wood, air, oil on sheet of paper, spectacles, plastic spoon, butter paper, wall, velvet curtain, sun glass, magnifying glass Answers
i. He keeps the similar items together after sorting them. For example, packed foods are kept together, unpacked food are kept together. And also keep certain items in transparent containers to locate it easily.
ii.
Naturally occurring materials
Man-made materials
The materials which occur naturally are called naturally occurring materials.
The materials which does occur naturally but are created by man by combining various materials.
Eg : wood, cotton
Eg: plastic, detergent
iii.
The aquatic plants and animals use oxygen dissolved in water.
The property of substance due to which it dissolves in water is called solubility.
iv.Anything that occupies space and has mass is called matter. There are three states of matter- solid, liquid and gas. For example: solid- ice, liquid-water, gas- steam
v.Transparent- air, spectacles, magnifying glass
Translucent- oil on sheet of paper, butter paper, sunglass
Opaque- wood, plastic spoon, wall, velvet curtain
Question 4 GIVE REASONS FOR THE FOLLOWING: [1-2 marks]
Tumbler is used to hold water, so if it is made with cloth, it cannot hold water as the cloth will get wet and the water will leak.
Plastic and wood are bad conductor of heat, so it will prevent the hand from burning while cooking.
It is important to locate the object easily and quickly, dividing materials in groups help to study their properties and observe any patterns in these properties.
Sponge is a soft material so it can be easily scratched.
Glass is a transparent material, so if we hide behind it then it becomes easy for the other person to locate.
LONG ANSWER TYPE OF QUESTIONS/ HOTS/ SKILL BASED [3-5 marks]
Question 5
Study the diagram below and answer the following questions:
Out of fig a and b which one will form a solution?
Justify your answer.
Why the colour of water in fig a is different from fig b?
Fig a contains salt of copper which easily dissolves in water unlike the metal copper in fig b which is insoluble in water.
Fig a contains soluble salt of copper which is blue in colour and hence after dissolving it forms a blue solution.
Question 6
On what basis do we classify objects? Give some examples. Answers
Object are grouped on the basis of their physical properties like their shapes, the material they are made up and the properties like lustre, hardness or softness, solubility, floatation, transparency, conducting nature of heat and electricity and magnetic property. Metals like silver is shining (lustrous), iron is hard in comparison to cotton (hardness) copper wire is good conductor of electricity while wood is an insulator.
Question 7
Why some shining materials eventually loose their shine and appear dull in due course of time? Is the loss of shine permanent? Answers
Shining materials which can react with oxygen and moisture in the air forms a coating of dull layer on their surface.
No, it’s not permanent. It can be reversed by polishing the surface.
Question 8
Study the diagram below and answer the following questions:
Why the dry leaf float and not the stone?
Give one example each of material that will float and sink in water other than the above two.
What will happen to honey if it is dropped in water?
Fig b will form a solution as sugar will dissolve completely in water because it is miscible in water.
After sometime the sand will sink at the bottom as it does not mix with water.
Oil would float and not mix with water as it is immiscible in water.
Question 10
Ramesh has three glass windows in his study room. He painted one of his glass window pane with yellow colour, the other one with black and he left the third one as it is.
Through which window pane can he see the outside clearly?
Through which window he will not be able to see at all?
What will happen when he views outside through the yellow window pane.
Question 12
“Some substances may float in water but sink in oil” do you agree with this statement? Justify your answer with at least three examples. Answers
Yes, I agree with this statement.
For example, dried leaves, ice, wax, float in water but will sink in oil.
Question 13
Given below is a table consisting of some items. Please tick the appropriate materials with which it can be made. Answers
Question 14
Given below is list of pair of substances that may or may not float in water kept in a tumbler. Put the tick in appropriate box. Answers
Question 15
Given below is a list of objects. Write down all the materials with which those objects can be made. Answers
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