Republic of the Philippines Department of Education Region III-Central Luzon Schools Division of Bulacan San Miguel National High School PRE-TEST Science 7 Directions: Read each item carefully and write the correct answer on your answer sheet. 1. Scientific Method is an important process in doing experiments, why is this so? A. It always provides people with correct results. B. It helps the experiment to take longer and be better. C. It ensures that the results can be trusted and repeated. D. It ensures that the people doing the experiments are scientific. 2. What is the correct order of steps in the scientific method? A. Ask a question, make a hypothesis, test the hypothesis, draw conclusions, and analyze results. B. Ask a question, make a hypothesis, test the hypothesis, analyze results, and draw conclusions. C. Ask a question, analyze results, make a hypothesis, test the hypothesis, and draw conclusions. D. Make a hypothesis, test the hypothesis, analyze results, ask a question, and draw conclusions. 3. Not all questions are scientific in character, which of the following questions is best considered as scientific? A. Who invented electricity? B. How long did dinosaurs live on Earth? C. How many koalas are there in Australia? D. Does the amount of salt in water affect the temperature at which it boils? 4. An element is also a substance, which of the following describes an element? A. The simplest substance. B. It can be broken down into other types of substances. C. It can be separated through a chemical process. D. It is composed of two or more types of atoms. 5. Which of the following is correctly matched? A. Fe: Element: Silver. FeS04 B. O: Element: 1120: Compound C. Sugar: Element: Salt: Compound D. Water. Element: Hydrogen: Compound 6. Sugar is made up of what elements? A. Sodium and Chloride B. Sodium arid Chlorine C. Carbon, Hydrogen and Oxygen D. Sodium and Oxide 7. Salt is a substance, while salt and water is a mixture. What is the difference between a substance and a mixture? A. Substance can be separated while mixture cannot be separated. B. Substance has many components while mixture has one only. C. Substance is heterogeneous while mixture is homogeneous. D. Substance is pure while mixture is impure. 8. Coffee and sugar are mixed easily. What substance is made by mixing two elements without being chemically combined? A. Compound B. Element C. Mixture D. Solution 9. When combining solute and solvent, the amount of each may be the same or different. Which of the following refers to the solution that contains as much solute as can dissolve at a given temperature? A. Solubility B. Dilute solution C. Saturated solution D. Unsaturated solution 10. In making our homemade beverage, we are careful not to make it very sweet. In the case of overly sweetened drinks, what can do to dilute it if you think it doesn't taste right? A. Add water B. Add sugar C. Boil the lemonade D. Put it in the refrigerator Address: Scuala St., San Juan, San Miguel, Bulacan Telephone Nos: (044) 240-0171 / (044) 240-0175 Email Address: 300771@deped.gov.ph Republic of the Philippines Department of Education Region III-Central Luzon Schools Division of Bulacan San Miguel National High School 11. In a chemistry class, the teacher prepared a solution by mixing 25 grams (g) of sugar in 80g of water. What are the concentrations of the solute and solvent in percent (%) by mass? A. Solute: 34% ; Solvent: 60% B. Solute: 14% ; Solvent: 86% C. Solute: 24% ; Solvent: 76% D. Solute: 44% ; Solvent: 56% 12. A certain commercial drink contains 3% alcohol which means that: A. The solution contains 3mL of alcohol in 97mL of water. B. The solution contains 30mL of alcohol in 70mL of water. C. The solution contains 300mL of alcohol in 700mL of water. D. The solution contains 100mL of alcohol in 100mL of water. 13. Apparently there are more people who migrate nearby ocean, it causes the decline in the population of sea turtle. Which is most likely the cause of this decrease? A. tropical storms B. habitat loss C. increase in predators D. warmer temperatures 14. Cancer starts from cells that start to grow uncontrollably fast. They destroy tissues and organs. What does this say about the effect of diseased cells on higher levels of organization in an organism? A. Diseased cells do not affect the other parts of an organism B. Cancer involved only certain kinds of cells and does not affect any other kind of cell C. Diseased cells damage the higher levels of organization that make up: tissues, organs, organ systems and eventually the whole organism. D. Diseased cells affect only the next higher levels that they make up the tissues. 15. It was Ana's turn to observe the specimen under the microscope. What do you think is the best way to look under the microscope? A. with both eyes open B. with both eyes closed C. with one eye open D. none of the above 16. The following are considered objective lenses. A. HPO B. LPO C. 0I0 D. A, B, and C 17. This well-known scientist contributed much in the development of cell theory. Who is he? A. Robert Hooke B. Anton Van Leeuwenhoek C. Theodor Schwann D. Matthias Schleiden 18. The chloroplast of a cell contains the green pigment called chlorophyll. If the chloroplast of a plant cell is damaged, which will it be unable to do? A. Protect the cell B. Make food for the cell C. excretes waste materials D. give instruction for cell to reproduce 19. A farmer wants to propagate a good variety of crops in a way which maintained all its desirable traits. Which of the following methods should be used? A. self-pollination B. vegetative propagation C. growing seeds produced from this variety D. cross-pollinating this crop with another good variety and growing the seeds resulting from the cross. 20. Plants, being the ultimate source of food, needs water, radiant energy, minerals, oxygen, and carbon dioxide to live. How are these requirements needed by plants categorized? A. Abiotic components B. Biotic components C. Climate D. Minerals 21. A plant is pollinated by a species of moth. The moths lay their eggs in the flowers of the plant for protection and food. Which of the following best defines the ecological interaction between the plant and the moths? A. Commensalism B. Competition C. Climate D. Parasitism Address: Scuala St., San Juan, San Miguel, Bulacan Telephone Nos: (044) 240-0171 / (044) 240-0175 Email Address: 300771@deped.gov.ph Republic of the Philippines Department of Education Region III-Central Luzon Schools Division of Bulacan San Miguel National High School 22. Not all bacteria are bad. Humans have 'good bacteria' in their digestive tract, which assists in digesting food. The bacteria thrive there. What type of a symbiotic relationship is this? A. Mutualism B. Commensalism C. Parasitism D. Competition 23. A farmer grew only one type of garlic. All of the garlic plants died from the same disease. What can be said on this garlic plant population? A. The garlic plants were genetically identical. B. Only few plants were resistant to the disease. C. All of the garlic plants were resistant to the disease. D. Ihe garlic plants were genetically different from each other. 24. Orchids live and grow on tree trunks. This means that a tree frunk is the of an orchid. A. niche B. community C. ecosystem D. habitat 25. Food producer for the plant cell. It converts the energy of the sun into sugar. A. nucleus B. cell membrane C. chloroplast D. cytoplasm 26. How do you compute the average speed of each vehicle? A. Add the distance travelled and the time of travel B. Multiply distance by the time of travel C. Divide the distance travelled by the time of travel D. Divide time of travel by distanced travelled 27. Which of the following is NOT accelerating? A. a bus moving along a straight path B. a coin whirling around a circular path C. typhoon Yolanda slowing down from 220 km/h to 200 km/h. D. Rui running a 200-m dash from rest to the finish line. 28. A change in position with respect to a reference point is called A. acceleration B. distance C. force D. motion 29. What is the average speed of a jeepney if it travels 100 kilometers in two hours? A. 30 km/h B. 40 km/h C. 50 km/h D. 60 km/h 30. It is the spatial period, or space, of the wave the distance over which the wave's shape repeats like crest to crest. A. Amplitude B. Crest C. Trough D. wavelength 31. It is the height of the wave. A. Amplitude B. Crest C. Trough D. wavelength 32. Which of the following would best transmit sound? A. steel in cabinet B. water in the ocean C. air in your classroom D. water in a swimming pool 33. Which illustration below shows the loudest sound? 34. Which of the following is NOT true about the nature of light? A. Light is an electromagnetic wave. B. Light is a mixture of ROYGBIV colors of light. C. Light is a form of energy that travels in space. D. Light has a constant speed of 3 x 108 m/s in any medium. 35. Which of the following is NOT an electromagnetic wave? A. infrared B. radio wave C. sound wave D. x-ray 36. By which process do visible light rays pass through a window glass? A. absorption B. conduction C. convection D. radiation Address: Scuala St., San Juan, San Miguel, Bulacan Telephone Nos: (044) 240-0171 / (044) 240-0175 Email Address: 300771@deped.gov.ph Republic of the Philippines Department of Education Region III-Central Luzon Schools Division of Bulacan San Miguel National High School 37. Which of the following groups of materials are considered good conductors? A. aluminum, copper, gold, silver B. glass, rubber, aluminum, ceramic, copper C. glass, rubber, ceramic, dry wood D. silver, rubber, aluminum, ceramic, wet wood 38. Which of the following system is a way of locating points by labelling them with numbers? A. Coordinate B. Number C. Solar D. Subordinate 39. Where should you always begin with when measuring the lines of latitude? A. Equator B. Longitude C. North Pole D. Prime Meridian 40. Which of the following uses non-renewable energy? A. Dam in Norzagaray, Bulacan B. Geothermal Power Plant in Negros, Oriental C. Malampaya Gas-to-Power Project in Palawan D. Windmills in Bangui, Ilocos Sur 41. Time and resources are spent mostly at homes during the pandemic. Give the best practice to become healthier, more productive and wiser using energy resources. A. Watch informative programs all day. B. Eat healthy food and play video games with friends. C. Exercise intensely and sleep in an air-conditioned room. D. Help in household chores, eat healthy, and watch TV occasionally. 42. Layers of the earth that surrounds and protects us from dangerous rays from the sun. A. Atmosphere B. Biosphere C. Hydrosphere D. Lithosphere 43. What might happen if the Earth didn't have an atmosphere? A. Everything would go flying off into space. B. The Earth's rotation would stop. C. The season would be longer. D. We wouldn't be able to breathe. 44. The kind of weather you expect at the Intertropical Convergence Zone (ITCZ). A. cold and dry B. cold and wet C. dot and dry D. wet and dry 45. The wind that blows depending on a certain air pressure and temperature is called _________. A. air B. breeze C. monsoon D. thunder 46. Refer to figure below to answer question number 46. Which motion do the arrows in the diagram represent? A. Earth's rotation B. Sun's rotation C. Sun's Revolution D. Earth's Revolution 47. One complete revolution of the Earth around the Sun takes about A. 365 1/4 days B. 365 h days C. 365 % days D. 366 1/4 days 48. What is the imaginary line where the Earth spins? A. axis B. orbit C. rays D. tilt 49. Which part of the earth is experiencing summer in June and winter in December? A. The northern hemisphere since it receives direct rays from the sun in June and lesser in December B. The northern hemisphere because sun is closer at this point. C. The southern hemisphere because it receives more solar energy in June than in December. D. The southern hemisphere because it is closer to the sun. 50. Which of the following scenario happens when the earth is directly positioned between the moon and the sun? A. lunar eclipse B. rotation C. solar eclipse D. tides Address: Scuala St., San Juan, San Miguel, Bulacan Telephone Nos: (044) 240-0171 / (044) 240-0175 Email Address: 300771@deped.gov.ph
