The City School PAF Chapter Comprehensive Worksheet DEC 2018 Science Class 8 Candidate Name: Index Number: Section: Branch/Campus: Date: INSTRUCTIONS: Write your name, index number, section, branch/campus and date clearly in the space provided. Read and follow the instructions of the given questions. Answer all the questions in the space provided. Select only one answers when made to choose, otherwise no marks will be given. Check your answers before handing your paper in. Marks for each section are shown below. This paper consists of 09 printed pages including the cover page. For Examiner s use only Sections Section A Section B Total Question 1 2 3 4 5 1 2 3 4 5 6 7 8 9 10 11 Max. Marks 15 10 10 10 5 10 1 5 5 4 10 4 6 1 2 2 100 Marks Obtained Percentage Grade INVIGILATED BY MARKED BY MARKS TALLIED BY The City School / PAF Chapter/ Comprehensive Worksheet/ December 2018/ Science / Class 8 Page 1 of 8
SECTION: A OBJECTIVE Q1: Choose the best answer. [ / 15] 1. Which of the following types of medicines can be used to prevent infectious diseases? (a) Antibiotics (b) Antiviral (c) Painkillers (d) Vaccines 2. Which of the following are the microorganisms? (a) Yeasts (b) Bacteria (c) Amoeba (d) Virus 3. The speed of light is (a) 30 000 m/s (b) 300 000 000 m/s (c) 3000 m/s (d) 300 000 000 000 m/s 4. When light rays enter a glass block it: (a) Absorbs (b) Reflects (c) Refracts (d) Radiates 5. Which of these is not a part of alimentary canal? (a) Mouth (c)kidneys (b) Stomach (d) rectum 6. Milk is a rich source of the following nutrients except (a)iron (b) Calcium (c) Protein (d) Carbohydrate 7. Which of the following basic nutrient is needed for building and repair of tissue in the body, found in beef, eggs and nuts? (a) Fiber (c)mineral (b) protein (d) Carbohydrates 8. An image formed with a lens that can be projected onto a screen is called a (a) Objective (b) Imaginary (c) Real (d) Virtual The City School / PAF Chapter/ Comprehensive Worksheet/ December 2018/ Science / Class 8 Page 2 of 8
9. The process of bending light is called (a) Reflection (b) Refraction (c ) dispersion (d) Convection 10. The primary colors of light are: (a) Red, green, blue (b) Pink, purple, white (c) Blue, red, yellow (d) Blue, yellow, red 11. The involuntary wave like contraction by which food is moved through alimentary canal is called: a) Breakdown b) Peristalsis c) Excretion d) Digestion 12. Animals that are able to digest cellulose are called: a) Rodents b) Predators c) Ruminants d) Prey 13. Function of large intestine is to absorb: a) Vitamins and Minerals b) Fats and Proteins c) Carbohydrates and Proteins d) Water and Minerals 14. Convex lens a) produce upright image b) produces magnified image c) used as cosmetic mirrors d) used as dentist s mirror 15. Light year is the distance light travels in a) One year b) Two years c) Three years d) Four years Q2. : Answer the following questions briefly. [ /10] 1. What are digestive enzymes? 2. What is the end product of protein digestion? 3. Which bacteria is used in making yogurt? 4. What happens to the length of metals as temperature rises? 5. Why does bread rises when baked? 6. Why does a swimming pool appear shallower than it actually is? 7. What is the speed of light in the vacuum? The City School / PAF Chapter/ Comprehensive Worksheet/ December 2018/ Science / Class 8 Page 3 of 8
8. What kind of an image does a dentist s mirror produce? 9. Write the mirror image of the word AMBULANCE. 10. In general, what will happen to solid, liquids and gases when they gain heat? Q3: Match Column A with Column B and write the correct alphabet in Column C. [ / 10] Q.4 Complete these sentences. [ /10] 1. On entering a denser medium, the light bends the normal. 2. are proteins produced by the body to fight germs. 3. Hot food cools down because the temperature of the food is higher than room temperature, as a result flows from the food to the surroundings. 4. When a metal rod is heated, it. This is because the particles faster and so move each other further apart. 5. is the transfer of heat from one part of a fluid to another part by the circulating movement of the fluid itself. 6. Chickenpox is a infectious disease. 7. Carbohydrates are divided in to two major groups; simple carbohydrates and carbohydrates. 8. The micro-organisms which cause infectious diseases are called. 9. Apparent depth and dispersion of white light are the effects of. Q.5 State whether True or False. [ /5] 1. Temperature is a measure of degree of coldness. 2. The angle of incidence is always equal to the angle of reflection. 3. Bile is produced by the pancreas and is stored in the liver. 4. Digestion of excess water and minerals takes place in the small intestine. 5. Concave mirrors produce a magnified image if the object is near to the mirror. The City School / PAF Chapter/ Comprehensive Worksheet/ December 2018/ Science / Class 8 Page 4 of 8
SECTION: B SUBJECTIVE Q.1 This diagram shows the digestive system in the human body. ( /10) (a)name the following parts: A. C. E. B. D. F. (b) X is a gland below the mouth. What substance does X secrete? (c) Y is connected to the liver. Which substance is stored in Y? (d) D contains a strong acid. What is the purpose of this acid? (e) What process takes place in B? (f) What is the function of C? (g) Name at least two enzymes found in the juice secreted by E? The City School / PAF Chapter/ Comprehensive Worksheet/ December 2018/ Science / Class 8 Page 5 of 8
Q.2 The diagram below shows cups of hot drinks at different temperatures. (_/1) Which one will lose heat fastest? Q3. The diagrams P, Q and R show a ray of light passing through a rectangular glass block. ( /5) a) What is the process of bending light like this called? Why causes this process to happen? b) Which diagram, P, Q or R, shows the correct path of the light? Q.4 Sunlight is split up into a spectrum of colours by a triangular prism, as shown below. ( /5) The City School / PAF Chapter/ Comprehensive Worksheet/ December 2018/ Science / Class 8 Page 6 of 8
1. What name is given to the splitting up of sunlight in this way? 2. What colour is the light at X? 3. How does the prism split white light up into a spectrum? 4. White light is shone at a green filter. What colour is the light transmitted by the green filter? 5. Grass looks green in white light because it reflects green light and absorbs all the other colours. Explain why a blue flower looks blue in white light. Q.5 Distinguish between physical and chemical digestion. ( /4) Physical digestion Chemical digestion Q6. Explain why? ( /10) 1. Can malaria be treated with antibiotics? 2. Fiber is not digested by human beings yet it is an essential part of a balanced diet. 3. Convection cannot take place in solids. 4. A swimming pole appears to be shallower than it actually is. 5. Frequent washing of hands can prevent the spread of infectious diseases. The City School / PAF Chapter/ Comprehensive Worksheet/ December 2018/ Science / Class 8 Page 7 of 8
Q7. A balanced diet includes carbohydrates, proteins and fats. ( /4) (a) Name two natural (not processed) sources of dietary carbohydrate. (b) Give two uses of proteins in the body. Q.8. Match the column A with column B. ( /6) Column A Column B 1. Micro-organisms a. The smallest living organism on Earth. One type can cause hepatitis A if they get into food. 2.Pathogens b. Microorganisms that allow bread to rise but can cause other foods to spoil. 3.Bacteria c. Tiny single-celled organisms that can be seen only with a microscope. Examples are bacteria, moulds, yeasts. 4.Viruses d. Harmful microorganisms that can make people sick. 5.Parasites e. Microorganisms that can be either helpful or harmful in foods. 6.Yeasts f. Tiny, microscopic animals such as amoebas. Can cause amoebic dysentery. Q.9 Ali has been given a vaccine for measles. What do you think is there in the vaccine? ( /1) Q.10 White blood cells are the part of human immune system. ( /2) How do they help us resist and prevent infectious diseases? Q.11 Look at the diagram below. Identify and write down two of its characteristic. ( /2) The City School / PAF Chapter/ Comprehensive Worksheet/ December 2018/ Science / Class 8 Page 8 of 8