XSEED Summative Assessment Test 1. Science, Test 1. XSEED Education Science Grade 8 1

Transcription

1 8 Science, Test 1 1

2 NAME: GRADE: SECTION: PART I Short Answer Questions 30 Marks 1. Look at the pictures and answer the questions. A. Which type of irrigation method is shown in the pictures? Choose answers from the box. sprinkler basin pulley furrow drip 2 Picture 1 Picture 2 Picture 1: Picture 2: B. Write 1 difference between the two methods of irrigation. 2. Read the chart and fill in the table. 4 Static friction Example: A box kept at rest on the floor Types of Friction Sliding friction Example: A chair being pushed on the floor Rolling friction Example: A ball rolling on the floor 2

3 Activity Type of friction A. Rubbing hands together B. A boy sitting at the edge of a slide C. Dragging a trolley bag with wheels D. Mopping the floor with a cloth E. A girl skating on the floor F. A stone kept on an incline G. A person skiing on ice H. Rotating ball bearings of a wheel 3. Number the steps of cultivation in the correct order. 3 The seeds are sowed manually or by using a seed drill. The crops are irrigated at regular intervals of time. The soil is ploughed manually or by using a cultivator to loosen it. Weeding or removal of unwanted plants is done. Manure or fertilizers are added to the soil to increase its fertility. The crops are harvested manually or by using a machine called harvester. 3

4 4. Explain two ways in which biotechnology has helped to improve crops. Give one example to support each explanation. 4 4

5 5. Complete the flowchart by writing the features of leaves belonging to different classes of gymnosperms. One example has been done for you Look at the pictures and fill in the table. 4 A. Microorganism Any 1 feature of its body structure B. Algae Bacteria 5

6 C. D. Virus Protozoa 7. Complete the table about methods used to increase crop yield. 5 Method to increase crop yield A. Name of the method (Mixed cropping/crop rotation) B. 1 feature of this method 6

7 C. 1 advantage of using this method 8. Use the chart and answer the questions. 5 Elements Symbol Valency Oxygen O 2 Sodium Na 1 Hydrogen H 1 Chlorine Cl 1 Potassium K 1 A. Write the rule that is followed in deriving symbols of oxygen and hydrogen from their names. B. Why is the symbol of Potassium K and not P? C. Criss-cross method is used to derive the formulae of compounds from the valencies of the combining elements. Derive the formulae of given compounds using this method. Criss-cross method Potassium chloride Sodium oxide K Cl Na O Final formula 7

8 PART II Long Answer Questions 9. Read the text and answer the questions. 30 Marks 6 Approximately 80 metals and 20 non-metals have been discovered so far. Most metals are solids except mercury. Most metals are strong and hard; conduct heat and electricity; have lustre and are malleable and ductile. Non-metals exist either as solids or gases. Most non-metals are soft except diamond. They are also poor conductors of heat and electricity except graphite. A. Complete the table about uses of metals and non-metals. Use of metal/non-metal Property of the metal/non-metal on which the given use is based Aluminium is used to make foil. Copper is used to make cooking utensils. Gold is used to make jewellery. Diamond is used to cut glass. B. Three electric circuits were made using 3 different materials in each of them. Based on the properties of metals and non-metals, in which circuit or circuits will the bulb light up? Give a reason for your answer. 8

9 10. Look at the pictures and answer the questions. 6 6-year-old girl Reaching Reproductive Maturity (Puberty) 14-year-old girl (after puberty) 6-year-old boy 14-year-old boy (after puberty) A. The bodies of girls and boys change differently during puberty. Give 2 differences. Body changes during the process of puberty Girls Boys B. Write 2 ways in which boys and girls should take care of their health during puberty

10 11. Read the text and answer the questions. 6 Two girls were playing tug of war with a rope. Girl 1 pulled the rope towards herself with a force of 36N while Girl 2 pulled the rope towards herself with a force of 42N. A. Fill in the table. a. Is the type of force exerted on the rope contact or non-contact? b. Are the 2 forces acting on the rope balanced or unbalanced? Type of force Give a reason for your answer. B. Calculate the net force acting on the rope. C. Which girl will win the tug of war? Give a reason for your answer. 10

11 12. Look at the diagrams and answer the questions. 6 Transverse section of dicot root Transverse section of dicot stem A. Write how the given plant tissue systems are different in a dicot root and a dicot stem. Tissue system Dicot root Dicot stem Dermal tissue system (Epidermis) Ground tissue system (Hypodermis and cortex) B. Draw a labelled diagram to show the arrangement of xylem and phloem in a dicot root. 11

12 13. Answer the questions about pressure in solids and liquids. A. Pressure in solids depends upon force applied and area of contact. A lady has 2 types of shoes: Shoe 1 and Shoe 2 with heels that have different areas of contact. 6 If the force exerted by her foot on both the shoes is 72 N, in which case will her heel exert more pressure? Why? B. Look at the picture. Explain how liquid pressure is used to lift the car. END OF QUESTIONS IN TEST PAPER 12

13 Score Report Name: Roll No.: Grade: Section: To be filled in by the teacher: SECTION QUESTION NUMBER/TOPIC MARKS Part I Short Answer Questions TOTAL MARKS 1. Types of Irrigation 2 2. Types of Friction 4 3. Steps of Cultivation 3 4. Food management 4 5. Classification & Features of Gymnosperms 3 6. Types of Microorganisms 4 7. Methods to Increase Crop Yield 5 8. Elements and Compounds 5 PART I SUBTOTAL 30 Part II Long Answer Questions 9. Physical Properties of Metals and Non-metals Puberty Types of Forces Internal Structure of Stem and Root Pressure 6 PART II SUBTOTAL 30 TOTAL MARKS 60 13