2. Revision

3. Q.1: Draw the lines. 1. a curved line 2. a vertical line 3. parallel lines 4. a horizontal line 5. a diagonal line 6. an angle Q.1: Draw the lines. 1. a curved line 2. a vertical line 3. parallel lines 4. a horizontal line 5. a diagonal line 6. an angle

4. Q.2: Which of these letters are described below. Write the correct letters in the boxes. D, M, C, H, F, L, Z, B a) A letter with 2 horizontal lines and 1 diagonal line. b) A letter with 1 curved line and no straight line. c) A letter with 2 curved lines and 1 vertical line. d) A letter with 2 parallel vertical lines, 1 horizontal line and 4 angles. e) A letter with 2 vertical lines and 2 diagonal lines. Q.2: Which of these letters are described below. Write the correct letters in the boxes. D, M, C, H, F, L, Z, B a) A letter with 2 horizontal lines and 1 diagonal line. b) A letter with 1 curved line and no straight line. c) A letter with 2 curved lines and 1 vertical line. d) A letter with 2 parallel vertical lines, 1 horizontal line and 4 angles. e) A letter with 2 vertical lines and 2 diagonal lines.

5. Q.3: Choose the correct. a circle a square a triangle semi circle rectangle square a triangle a circle a square semi circle rectangle square a circle a square a triangle Q.3: Choose the correct. a circle a square a triangle semi circle rectangle square a triangle a circle a square semi circle rectangle square a circle a square a triangle 21 321 321 21 3 3 21 3

6. Q.4: Complete the sentences. 1. A coin is shaped like a ……………………… It is ……………………in shape. 2. A ruler is shaped like a ……………………… It is ……………………in shape. 3. A set square is shaped like a ……………… It is ……………………in shape. 4. A protector is shaped like a ………………… It is ……………………in shape. 5. A chess board is shaped like a …………… It is ……………………in shape. Q.4: Complete the sentences. 1. A coin is shaped like a ……………………… It is ……………………in shape. 2. A ruler is shaped like a ……………………… It is ……………………in shape. 3. A set square is shaped like a ……………… It is ……………………in shape. 4. A protector is shaped like a ………………… It is ……………………in shape. 5. A chess board is shaped like a …………… It is ……………………in shape. square rectangular semi-circle triangle circle

10. Q.5 : Choose the correct. 1- The cross-section of a cylinder is………… a) square b) circular c) cylindrical 2- The sides of a cone are ……………… a) parallel b) tapering c) circular 3- The cross-section of a sphere is………… a) circular b) triangular c) spherical 4- The longitudinal section of a hemisphere is. a) square b) circular c) triangular 5- What shape is the cross-section of a cone? a) triangle b) square c) circle Q.5 : Choose the correct. 1- The cross-section of a cylinder is………… a) square b) circular c) cylindrical 2- The sides of a cone are ……………… a) parallel b) tapering c) circular 3- The cross-section of a sphere is………… a) circular b) triangular c) spherical 4- The longitudinal section of a hemisphere is. a) square b) circular c) triangular 5- What shape is the cross-section of a cone? a) triangle b) square c) circle

11. 1- A ball is spherical because it is shaped like a…………………….……… 2- A test-tube is cylindrical because it is shaped like a…………………… 3- A funnel is conical because it is shaped like a……………………………… 4- A flask is spherical because it is shaped like a……………………………… 5- A salt crystal is cubic because it is shaped like a……………………………… 1- A ball is spherical because it is shaped like a…………………….……… 2- A test-tube is cylindrical because it is shaped like a…………………… 3- A funnel is conical because it is shaped like a……………………………… 4- A flask is spherical because it is shaped like a……………………………… 5- A salt crystal is cubic because it is shaped like a………………………………

12. 1- A potato is…… disc shaped. 2- A piece of cheese is…… kidney shaped. 3- A bean is…… star shaped. 4- A blood cell is …… egg-shaped. 5- A snowflake is …… wedge shaped. 1- A potato is…… disc shaped. 2- A piece of cheese is…… kidney shaped. 3- A bean is…… star shaped. 4- A blood cell is …… egg-shaped. 5- A snowflake is …… wedge shaped.

13. 1- A………material breaks easily. 2- A………material does not break easily. 3- A………material is difficult to scratch. 4- A………material is easy to scratch. 5- A………material bends easily. 6- A………material does not bend easily. 1- A………material breaks easily. 2- A………material does not break easily. 3- A………material is difficult to scratch. 4- A………material is easy to scratch. 5- A………material bends easily. 6- A………material does not bend easily. tough brittle flexible soft rigid hard

14. 1- Smooth surface dissolve easily. 2- Rough surface produce a little friction. 3- Soluble in water do not dissolve. 4- Insoluble in water produce a lot of friction. 5- Transparent objects light cannot pass, you cannot see. 6- Translucent objects burn easily. 7- Opaque objects don not burn easily. 8- Combustible objects you cannot see but light pass. 9- Non-combustible objects you can see through. 1- Smooth surface dissolve easily. 2- Rough surface produce a little friction. 3- Soluble in water do not dissolve. 4- Insoluble in water produce a lot of friction. 5- Transparent objects light cannot pass, you cannot see. 6- Translucent objects burn easily. 7- Opaque objects don not burn easily. 8- Combustible objects you cannot see but light pass. 9- Non-combustible objects you can see through.

15. The Properties of elements compounds and mixtures. P.1- substance…element, compound, mixture element…cannot be broken…eg, nitrogen, iron compound…two or more elements combine P.2- elements combine…chemical reaction …properties change Cl… poisonous gas Na…soft metal, reacts with water Cl & Na combine… form NaCl (salt) …harmless P.3- mixed…without chemical reaction…do not change.. sand + salt … salty & gritty…salt dissolve…sand will not P.4- melting point…temperature…changes from solid to liquid boiling point…temperature…changes from liquid to gas changes of state…sometimes properties change Oxygen below -183 C…gas to bluish liquid…magnetic The Properties of elements compounds and mixtures. P.1- substance…element, compound, mixture element…cannot be broken…eg, nitrogen, iron compound…two or more elements combine P.2- elements combine…chemical reaction …properties change Cl… poisonous gas Na…soft metal, reacts with water Cl & Na combine… form NaCl (salt) …harmless P.3- mixed…without chemical reaction…do not change.. sand + salt … salty & gritty…salt dissolve…sand will not P.4- melting point…temperature…changes from solid to liquid boiling point…temperature…changes from liquid to gas changes of state…sometimes properties change Oxygen below -183 C…gas to bluish liquid…magnetic

16. Description of property. Colourless. In the passage it says that oxygen is a colourless gas. Water is also colourless. Poisonous. ………………………………chlorine ……………………….Bromine……………………. Soluble. ………………………………salt ……………………….Sugar……………………. Silvery-white. …………………………sodium ……………………….Silver…………………….

17. b) An element is a substance that contains one type of atoms such as N & O. A compound is a substance that contains two or more elements such as H2O & CO2. c) Compounds are formed after chemical reaction while mixtures are formed without chemical reaction. In compounds elements change their properties while in mixture they don’t. Compounds cannot be separated into elements but mixtures can be. d) Sodium is a metal that reacts with water violently to produce H and heat. Its large amount can cause fire. Chlorine is a poisonous gas. e) Salt is soluble in water and sand is insoluble. f) The boiling point of oxygen is -183 C. b) An element is a substance that contains one type of atoms such as N & O. A compound is a substance that contains two or more elements such as H2O & CO2. c) Compounds are formed after chemical reaction while mixtures are formed without chemical reaction. In compounds elements change their properties while in mixture they don’t. Compounds cannot be separated into elements but mixtures can be. d) Sodium is a metal that reacts with water violently to produce H and heat. Its large amount can cause fire. Chlorine is a poisonous gas. e) Salt is soluble in water and sand is insoluble. f) The boiling point of oxygen is -183 C.