The City School Science Exam Paper 2020-2021 PDF

The City School Unified End of Year Examination 2020-21 BRANCH NAME EXAMINATION ROLL NUMBER EXAMINATION ROOM NUMBER SCIENCE CLASS 7 June 2021 2 hours READ THESE INSTRUCTIONS FIRST --- For Examiner’s use only ---  Write your School/Branch Name, Examination Question No. 1     Roll Number and Exam...

The City School Unified End of Year Examination 2020-21 BRANCH NAME EXAMINATION ROLL NUMBER EXAMINATION ROOM NUMBER SCIENCE CLASS 7 June 2021 2 hours READ THESE INSTRUCTIONS FIRST --- For Examiner’s use only ---  Write your School/Branch Name, Examination Question No. 1     Roll Number and Examination Room Number in the boxes at the top of the page. Read and follow the instructions given for each question. Answer all questions in the space provided. Check your answer paper before you hand it to the invigilator. Marks for each question are mentioned with the question. Max. Marks Marks Obtained 20 2 10 3 10 4 10 5 5 6 4 7 6 8 5 9 5 10 6 11 5 12 5 13 9 Total 100 Invigilated by: ______________________________ Marked by: ________________________________ Marks entered by: __________________________ The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Percentage Page 1 of 14 Section A Objective Marks 50 Q.1 Multiple choice questions: [_____/20] For every statement there are four options A, B, C and D given, encircle the best suitable option. i. Living things are placed into ____ taxonomic groups. A 6 B 5 C 9 D 8 ii. Ferns are vascular plants without _______. A seeds B Flowers C Fruits D Vascular tissues iii. Which of the following groups contain mammals that lay eggs? A Marsupial B Monotremes C Chiroptera D Rodentia iv. Arthropods include all of the following except __________. A centipedes B lobster C fluke D scorpion v. Which of the following is not a property of matter? A The particles of matter are extremely small B The particles of matter have spaces between them C The particles of matter are in stationary state D The particles of matter attract each other The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 2 of 14 vi. A gas has ___________. A definite volume and no definite shape. B no definite volume no definite shape. C definite shape and volume. D definite shape but no definite volume. vii. A neutral carbon atom has ______ protons. A 7 B 4 C 6 D 5 viii. Oxygen gas is made up of many oxygen __________. A atoms B molecules C particles D sub atomic particles ix. Which of the following could have the formula XY2? x. When 2 or more substances combine to form a new substance, the chemical reaction is called _________________. A decomposition B respiration C combination D substitution The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 3 of 14 xi. During a chemical reaction, mass is _________. A conserved B lost C gained D doubled xii. Gas given off when calcium carbonate reacts with dilute hydrochloric acid is ________. A hydrogen B oxygen C carbon dioxide D carbon monoxide xiii. Contrast the way natural gas and oil are formed to the way coal is formed. A Natural gas and oil are formed by decomposed plant and animal matter; coal is formed by decomposed plant matter only. B Natural gas and oil are formed by decomposed animal matter only; coal is formed by decomposed plant and animal matter. C Natural gas and oil are formed by decomposed plant matter only; coal is formed by decomposed animal matter only. D Natural gas and oil are formed by decomposed animal matter only; coal is formed by decomposed plant matter only. xiv. Biogas produced when plants and animals rot in the absence of air contains _____________. A nitrogen B carbon dioxide C methane D ethane xv. What makes renewable energy different from non-renewable energy? A Renewable energy can be made over and over again. B Renewable energy cannot be made again. C Renewable energy can’t be replaced. D Renewable energy can’t be replaced by nature. The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 4 of 14 xvi. The heat energy trapped inside the Earth is called ____________ energy. A geothermal B thermal C potential D kinetic xvii. Ali wants to measure the current in the circuit. Identify what is wrong with this circuit diagram? A There is only one cell B The ammeter should be connected in parallel to the switch C The ammeter should be connected in series in the circuit D There should be a voltmeter connected to measure current xviii. Current flowing through the filament in a lighted electric bulb is caused by the flow of ___________. A protons B electrons C neutrons D atoms xix. Identify a role of the given circuit component? A It is used to open or close the circuit. B It prevents large flow of current through a circuit. C It is a source of electricity. D It connects the circuit components. xx. The SI unit for electric current is _________. A milli ampere B micro ampere C ampere D volt The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 5 of 14 Q.2 Identify the following statements as True or False. Correct the false statements. [__/10] i. Angiosperms are non-vascular plants bearing flowers. __________________________________________________________________ ii. Nematodes have round, segmented bodies. __________________________________________________________________ iii. Diffusion is observed when pollen grains float on water. __________________________________________________________________ iv. In a neutral atom, there are equal number of protons and neutrons. __________________________________________________________________ v. The chemical formula of ozone is O3. __________________________________________________________________ vi. Magnesium burns in air to form magnesium oxide. __________________________________________________________________ vii. Coal, petroleum and natural gas are examples of renewable energy resources. __________________________________________________________________ viii. Natural gas mainly consists of propane. __________________________________________________________________ ix. Adding a light bulb to a series circuit will increase total resistance. __________________________________________________________________ x. Rheostats have variable resistance. __________________________________________________________________ The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 6 of 14 Q.3 Match the word/phrase in column A with the correct description in column B and write your answer in column C. [_____/10] Q.4 Column A i. Cedar tree a. ii. Kapok tree b. iii. John Dalton c. iv. Robert Brown d. v. Non luminous flame e. vi. Dimmer switch f. vii. Thermal decomposition g. viii. Luminous flame h. Column B hotter, soot is not produced Column C i. sugar breaks into carbon and water soot is produced ii. iii. atom has a nucleus surrounded by iv. electrons. nucleus is made up of protons and v. neutrons. matter is composed of small vi. discrete particles gymnosperm vii. ix. Rutherford Model i. dead pollen grains suspended in water are constantly moving variable resistor x. Quantum Model j. angiosperm viii. ix. x. Fill in the blanks. [___/10] i. ______________ attack their prey with stinging threads or tentacles. ii. Scientific names of a specie has_________ parts. iii. Process of _____________ occurs at a range of temperatures at the surface of a liquid. iv. The number of protons in an atom is called ____________. v. When an atom gains or loses an electron, it forms a/an _____. vi. When hydrogen molecule is broken down into its atoms, energy is __________. vii. Energy from waves is harnessed by using _____________. viii. Hydroelectric power stations use energy from __________ to produce electricity. ix. In parallel circuits, resistance ___________ as more resistors are added. x. The current flowing through each branch in a parallel circuit is _____ than the current flowing out from the source. The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 7 of 14 Section B Subjective Q.5 Animals are divided as vertebrates and invertebrates. (a) Identify the above invertebrate. Marks 50 [___/5] _____________________________________________________________________ (b) Which class of invertebrates does it belong to? _____________________________________________________________________ (c) Write two characteristics of this class. _____________________________________________________________________ _____________________________________________________________________ (d) Give another example of this class. _____________________________________________________________________ Q.6 Arthropod is a class of invertebrates. (a) What are the three characteristic features of arthropods? [___/4] _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ (b) Give one example of an arthropods? _____________________________________________________________________ The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 8 of 14 Q.7 Use the particle model of matter to explain the following: [___/6] (a) Solids cannot diffuse _____________________________________________________________________ _____________________________________________________________________ (b) Gases have lower densities than liquids _____________________________________________________________________ _____________________________________________________________________ (c) When a liquid is cooled, it changes to ice _____________________________________________________________________ _____________________________________________________________________ Q.8 Answer the following questions [___/5] (a) Name the element whose chemical symbol is given in the box below: 16S ______________ (b) Identify its atomic number. _____________________________________________________________________ (c) State the number of protons and electrons which a neutral atom of this element has. _____________________________________________________________________ (d) An atom of the element given above gains two electrons in a chemical reaction. Write down the symbol for the ion formed. _____________________________________________________________________ The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 9 of 14 Q.9 Answer the following questions [___/5] (a) Identify whether the following is a molecule of elements or a compound and state the number and types of atoms present in it. Molecules of elements or molecules of compound? Number of atoms Type of atoms (b) The given circles present possible electron shells of an atom. Nitrogen atom has 7 electrons. Fill its electrons in the shells below. (You may not have to use all the shells) Q.10 (a) When lithium metal is added to water, a vigorous reaction occurs to form lithium hydroxide and a colourless gas. [___/6] i. Identify the gas produced during this chemical reaction. _______________________________________________________________ ii. How can you prove your choice in part “a”? _______________________________________________________________ iii. Express this reaction in the form of a word equation. The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 10 of 14 (b) Read the given scenario. Write whether a physical or a chemical change has occurred and give evidence for your decision. Scenario Type of change Evidence You forgot to dry the bread knife when you washed it and reddish brown spots appeared on it. Q.11 One advantage of using the wind and solar energy to generate electricity is that it is a renewable energy source. [___/5] (a) Give 1 other advantage of using the wind to generate electricity. ___________________________________________________________________ (b) Give 1 disadvantage of using a wind generator to charge a battery. ___________________________________________________________________ (c) Give 1 disadvantage of using solar energy to generate electricity. ___________________________________________________________________ (d) Write 2 disadvantages of burning fossil fuels? ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ Q.12 Answer the following questions (a) Differentiate between renewable and non-renewable energy resources. [___/5] _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 11 of 14 (b) i. From where does ethanol come from and what is process of obtaining ethanol called? _____________________________________________________________________ _____________________________________________________________________ ii. Why is ethanol a renewable energy resource? ____________________________________________________________________ Q.13 The following figure shows an electric circuit. [___/9] (a) Name the component X. ___________________ (b) Suggest one reason why component X may be useful in the electrical circuit. _____________________________________________________________________ (c) On Figure, indicate the direction of flow of electrons. (d) What is the function of component Y? _____________________________________________________________________ (e) State the energy changes taking place in the component Y? _____________________________________________________________________ (f) Some students set up a circuit and decided to measure the current at different points around the series circuit. A diagram their circuit is shown below. Ammeter 1 measured a current of 6 A. What was the current reading shown on: i. Ammeter 2: _______________ ii. Ammeter 3: ______________ iii. What do you conclude from the ammeter reading in series circuit? ________________________________________________________________ The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 12 of 14 (g) What is wrong with the ammeter in electric circuit shown below? _____________________________________________________________________ The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 13 of 14 BLANK PAGE The City School / Unified End of Year Examination, June 2021 / Science / Class 7 Page 14 of 14