The City School PAF Chapter Comprehensive Worksheet May 2018 Science Class 7 Candidate Name: Index Number: Section: Branch/Campus: Date: Maximum Marks: 50 Time Allowed: 1 hour 30 minutes 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 answer 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 08 printed pages including the cover page. For Examiner s use only Objective(50) Subjective(50) Total Question 1 2 3 4 5 6 7 8 9 9 Max. Marks 20 10 10 10 10 10 10 15 5 100 Marks Obtained Percentage Grade INVIGILATED BY MARKED BY MARKS TALLIED BY The City School / PAF Chapter/ Comprehensive Worksheet/ May 2018/ Science / Class 7 Page 1 of 8
SECTION A: OBJECTIVE Q.1 Encircle the correct answer. [ / 20] 1. Living things are placed into the following eight taxonomic groups. a. Domain, kingdom, phylum, class, order, family, genus and species. b. Kingdom,class, order, domain, family, genus, phylum and species. c. Class, order, kingdom, domain, family, genus, phylum and species. d. Domain, family, genus, phylum, order, phylum, kingdom and species. 2. Modern man belongs to the genus a. Sapiens b. Homo c. Primata d. Hominid 3. Non Vascular plants live in a. Deserts b. Dry places c. Damp places d. Places 4. Sea URchin is an example of a. Echinoderms b. Cnidarians c. Sponges d. Annelids 5. Molecules of elements consists of a a. Fixed number of only one type of atom b. Fixed number of only two type of atom c. Fixed number of only three type of atom d. Fixed number of only four type of atom 6. CH4 is an example of a. Molecule of proton b. Molecule of element c. Molecule of compound d. Molecule of electron 7. In combustion or burning, a substance combines with a. Carbon b. Helium c. Oxygen d. Hydrogen 8. Which gas is produced with oxygen to produce carbon dioxide and water a. Carbon b. Nitrogen c. Neon d. Methane 9. When concentrated sulphuric acid is mixed with sugar in a beaker a. Carbon is formed b. Oxygen is formed c. Argon is formed d. Nitrogen is formed 10. Taj Mahal is affected by acid rain because acid rain consists of a. Dilute sulphuric acid b. Dilute calcium c. Dilute carbon d. Dilute oxygen The City School / PAF Chapter/ Comprehensive Worksheet/ May 2017/ Science/ Class 7 Page 2 of 8
11. Solar cells converts light energy from the sun directly into a. Non renewable energy b. Electrical energy c. Chemical energy d. Hydroelectric energy 12. When animal and plant matter rot in the absence of air a. Bio mass is given off b. Biogas is given off c. Fossil fuel is given off d. None of the above 13. From fermentation of sugar cane a type of alcohol a. Methane is produced b. Butane is produce c. Ethanol is produced d. Propane is produced 14. To control Electrical current a. Ammeter are used b. Electric cell are used c. Bells are used d. Resistors are used 15. The SI unit of ampere is a. Am b. A c. na d. Na 16. Electrons are a. Negative b. Positive c. Neutral d. None of above 17. Electrical component which opposes the flow of current. a. Battery b. Switch c. Resistor d. Ammeter 18. During the hydrolysis of water, an electric current is passed through water to break it down into a. Hydrogen and carbon b. Carbon and nitrogen c. Hydrogen and neon d. Hydrogen and oxygen 19. The energy needed for photosynthesis is a. Heat energy b. Water energy c. Light energy d. Calcium energy 20. A chemical reaction in which a substance burns in oxygen to form an oxide is known as a. Decomposition b. Combustion c. Combination d. Conversation The City School / PAF Chapter/ Comprehensive Worksheet/ May 2017/ Science/ Class 7 Page 3 of 8
Q.2 Fill in the blanks. [ /10] a. Seedless Vascular plants do not produce and seeds. b. Spring anteater is the example of. c. Each sulphur molecule is made up of sulphur atoms. d. The number of each type of atom present is denoted by a. e. The process of breaking down a substance into simpler substance is called. f. No mass is gain or lost during a chemical reaction, which is called. g. When a dilute acid reacts with carbonates, is produced. h. Carbon dioxide can turn milky. i. A bunsen flame has a higher energy output. j. A is made up of a short thin piece of wire. Q.3 State true or false and re-write the false statement. [ /10] a. If a current of 5 A flows through a fuse with a rating of 3A, the fuse will not melt. [ ] b. Crude oil is an example of Non renewable energy. [ ] c. A reason we need to conserve energy is that supplies of solar heater are limited. [ ] d. Solar cells have panels which are painted black to trap heat energy from sun. [ ] e. Electric current flows from the positive terminal to negative terminal. [ ] f. The energy from cells and batteries come from the physical reaction which takes place outside them. [ ] g. Rheostats resistance cannot be changed. [ ] h. Fuses are short thin pieces of wire connected in circuits to prevent large currents from flowing through the circuits. [ ] The City School / PAF Chapter/ Comprehensive Worksheet/ May 2017/ Science/ Class 7 Page 4 of 8
i. In parallel circuit, resistance increases as more resistors are added. [ ] j. The process of breaking down a substance into simpler substances by heating is called electrical hydrolysis. [ ] Q4. Match Column A with Column B and write in Column C. [ /10] Column A Column B Column C a. Have Vascular Tissues and are able to live in dry places a) Birds 1,b b. Are Warm-blooded and lay eggs with hard shells b) Vascular Plants 2,a c. Dead pollen grains move when bombarded with the water particles d. Matter is made up of small discrete particles that are in constant random motion c) Brownian Motion d) Particle Model of Matter 3,d 4,c e. When a solid is heated particles gain energy and vibrate faster until the attractive forces between the particles fail to hold them together e) Molecules 5,f f. Made up of two or more atoms chemically combined together. f) Melting 6,e g. Is an eclectically charged particle formed when atom loses or gains an electron g) Chemical change 7,h h. Changes in state such as melting, freezing and etc. h) Ions 8,i i. Cooking of food i) Is a switch 9,j j. j) Physical Change 10,i The City School / PAF Chapter/ Comprehensive Worksheet/ May 2017/ Science/ Class 7 Page 5 of 8
SECTION B: SUBJECTIVE Q5a. State whether the sources are renewable or non-renewable energy resources. [ /06] a) Solar b) Biomass c) Nuclear d) Thermal e) Crude oil f) Tides Q5b. Draw the atomic structure of the following atoms and ions. [ /04] a) 6 C b) 12 Mg c) 17 Cl -1 d) 19 K Q6a. Complete the following equations. [ /6] a) Magnesium + Oxygen b) Sulphur + Oxygen c) Methane + Oxygen d) Zinc + dilute sulphuric acid e) Oxygen + Hydrogen f) Calcium carbonate + dilute sulphuric acid The City School / PAF Chapter/ Comprehensive Worksheet/ May 2017/ Science/ Class 7 Page 6 of 8
Q6b. What do you understand by electrolysis? Explain it with examples. [ /02] Q6c. Describe ruther fords atomic model. [ /02] Q7a. State the function of the following. [ /04] Switch Battery Fuse Ammeter Q7b. Name and explain the model which is accepted by scientists now a days. [ /03] Q7c. Why wood is not called a fossil fuel? [ /03] The City School / PAF Chapter/ Comprehensive Worksheet/ May 2017/ Science/ Class 7 Page 7 of 8
Q8a. Complete the table. [ /12] Chemical formula Type of atoms Number of atoms Is it a molecule of an element or of a compound? H 2 O CCl 4 NH 3 CaCO 3 Q8b. Write three ways to conserve energy. [ /03] Q9a. Write the importance of classification. [ /04] Q9b. Write the difference between angiosperms and gymnosperms. [ /03] Q9c. How are mammals different from birds? [ /02] The City School / PAF Chapter/ Comprehensive Worksheet/ May 2017/ Science/ Class 7 Page 8 of 8