\nShoes<\/td>\n | Leather<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n <\/p>\n Question 4. \nState whether the statements given below are True or False: \na. Stone is transparent, while glass is opaque. \nb. A notebook has lustre while eraser does not. \nc. Chalk dissolves in water. \nd. A piece of wood floats on water. \ne. Sugar does not dissolve in water. \nf. Oil mixes with water. \ng. Sand settles down in water. \nh. Vinegar dissolves in water. \nAnswer: \na. False \nb. False \nc. False \nd. True \ne. False \nf. False \ng. True \nh. True<\/p>\n Question 5. \nGiven below are the names of some objects and materials: \nWater, basketball, orange, sugar, globe, apple and earthen pitcher \nGroup them as: \na. Round shaped and other shapes \nb. Eatables and non-eatables \nAnswer: \na. (i) Round shaped: Basketball, apple, orange, globe, earthen pitcher \n(ii) Other shapes: Water, sugar<\/p>\n b. (i) Eatables: Water, orange, sugar and apple \n(ii) Non-eatables: Basketball, globe and earthen pitcher<\/p>\n Question 6. \nList all items known to you that float on water. Check and see if they will float on an oil or kerosene. \nAnswer:<\/p>\n \n- Dried leaves<\/li>\n
- Paper<\/li>\n
- Wax<\/li>\n
- Ice<\/li>\n
- Oil<\/li>\n<\/ul>\n
All these materials float on water and they sink in oil or kerosene.<\/p>\n <\/p>\n Question 7. \nFind the odd one out from the following: \na. Chair, Bed, Table, Baby, Cupboard \nb. Rose, Jasmine, Boat, Marigold, Lotus \nc. Aluminium, Iron, Copper, Silver, Sand \nd. Sugar, Salt, Sand, Milk, Milk powder \nAnswer: \na. Baby \nb. Boat \nc. Sand \nd. Milk<\/p>\n NCERT Extended Learning Activities and Projects<\/span><\/p>\nQuestion 1. \nYou may have played a memory game with your friends. Several objects are placed on a table, you are asked to observe them for a few minutes, go into another room and write down the names of all objects that you can remember. Play this game, with a difference! Ask all the participants in the game to remember objects with some particular property’ while playing this memory game – remember and write down the names of objects that were made of wood or objects that are edible and so on. Have fun! \nHint: \nDo it yourself.<\/p>\n Question 2. \nFrom a large collection of materials, make groups of objects having different properties like transparency, solubility in water and other properties. In later chapters you will also learn about properties of materials related to electricity and magnetism. After making different groups from the collected materials, try and find out if there are any patterns in these groups. For instance, do all materials which have lustre conduct electricity? \nHint: It is not necessary to find a correlation between all properties. For example, mirror has lustre but does not conduct electricity.<\/p>\n Activity 1<\/span><\/p>\nObjective: To study whether the given material is soluble or insoluble in water. \nMaterials Required: Water, sugar, chalk, washing soda, sand, copper sulphate and sulphur. \nProcedure:<\/p>\n \n- Take 6 beakers and fill each of them to half with water.<\/li>\n
- Add a pinch of sugar, chalk powder, washing soda, sand, copper sulphate and sulphur in separate beakers.<\/li>\n
- Stir the contents of each beaker well and allow them to stand for a while.<\/li>\n
- Observe after few minutes.<\/li>\n<\/ul>\n
\nObservations: Particles of sugar, washing soda and copper sulphate have disappeared. Chalk powder, sand particles and sulphur are left as such. \nConclusion: Sugar, washing soda and copper sulphate are soluble in water. Sand, chalk powder and sulphur are insoluble in water.<\/p>\n
<\/p>\n Activity 2<\/span><\/p>\nObjective: To study the solubility of different liquids in water. \nMaterials Required: One spoon each of vinegar, lemon juice, honey, milk, coconut oil, mustard oil, kerosene and seven glass tumblers with water. \nProcedure:<\/p>\n \n- Add a small amount of vinegar to the first glass, lemon-juice to the second and similarly, add small amounts of the other liquids into other glasses containing water.<\/li>\n
- Stir contents of each of them with a spoon. Wait for 5 minutes.<\/li>\n<\/ul>\n
\nObservations: Vinegar, lemon juice, honey and milk have completely dissolved in water. Such liquids are miscible liquids. Liquids like coconut oil, mustard oil and kerosene have not dissolved. Such liquids are immiscible or insoluble liquids.<\/p>\n
\n- Metal: It is a hard, shiny, usually solid material which is able to be shaped and can conduct or allow electricity and heat to pass through it.<\/li>\n
- Transparency: Light can pass through certain objects. Due to this, we are able to see through the objects. This property of materials to allow light to pass through them and enable visibility is called transparency. On this basis, objects can be of three types:<\/li>\n<\/ul>\n
i. Transparent: If almost all the light can pass through an object, it is called transparent. We can see clearly through transparent materials such as air, water and a clear glass. \nii. Opaque: If no light can pass through an object, it is called opaque. We cannot see through an opaque material at all, such as cardboard, milk, stone and metal. \niii. Translucent: If light can pass through an object partially, it is called translucent. We cannot clearly see through a translucent material such as a frosted glass, turbid water and dust-laden air. Such materials allow partial visibility.<\/p>\n Activity 3<\/span><\/p>\nObjective: To distinguish between transparent, opaque and translucent materials. \nMaterials Required: Apiece of a clear glass, a cardboard, oily paper and torch. \nProcedure:<\/p>\n |