First Periodical Exam in Science 7 2024-2025 PDF

Republic of the Philippines Department of Education Schools Division Office of Bulacan **STA. LUCIA NATIONAL HIGH SCHOOL** Calumpit, Bulacan S.Y. 2024-2025 **First Periodical Exam in Science 7** **NAME:** **SCORE:** ---------------------- ------------ *...

Republic of the Philippines Department of Education Schools Division Office of Bulacan **STA. LUCIA NATIONAL HIGH SCHOOL** Calumpit, Bulacan S.Y. 2024-2025 **First Periodical Exam in Science 7** **NAME:** **SCORE:** ---------------------- ------------ **GRADE & SECTION:** **DATE:** **DIRECTION:** Read each test item carefully. Write the letter of your answer on your answer sheet. 1\. Why do scientists use models? A. They are exact representations of reality. B. They only exist in computer simulations. C. They are always simple and easy to understand. D. They can be used to test ideas and make predictions. 2. What can be a limitation of scientific model? A. They are never updated or improved. B. They are all based on real-world data. C. They are only used in physics, not other sciences. D. They cannot perfectly capture all the complexities of a system. 3. Which of the following CAN NOT be a scientific model for the atom? A. A song with lyrics full of subatomic particles and their charges. B. A round Styrofoam colored with parts representing electrons and other subatomic particles. C. A computerized interactive game where you can put subatomic particles and guess the correct image for atom. D. An image (picture, concept map, flowchart, etc.) that considers all laws of science 4. What is the characteristic of solid particles as seen in its particle model? A. Moving freely and spread far apart. B. Arranged in a specific pattern but with large gaps. C. Vibrating in place with minimal space between them. D. Flowing around each other and constantly changing positions. 5. What can be seen in the physical model of the Bohr model of the atom? A. A cloud of electrons C. Presence of orbitals B. nucleus at the center D. Nothing, just empty space 6. Which of the following shows how particles behave when heated? A. C. B. D. 7. How did the Kinetic Molecular Theory describe the particles of a solid? A. Only vibrating in place. B. Completely still and packed together. C. Constantly moving with large spaces between them. D. Constantly moving with very small spaces between them. 8. According to Kinetic Molecular Theory, what happens to the particles in a substance as its temperature increases? A. They move faster C. They stop moving B. B. They move slower D. Their arrangement doesn\'t change 9. In which state of matter do particles have the most freedom of movement? A. Gas C. Solid B. B. Liquid D. All states of matter have same freedom of movement. 10. What do you think is happening in Figure 1 below in terms of temperature change? A. The liquid substance was frozen and became solid. B. Temperature dropped and solidified the substance. C. The liquid substance was heated and evaporated as gas. D. Temperature was increased, and the substance was liquified 11. What can you say about the movement (speed) of the particles of solid, liquid, and gas based on this model? A. Gas particles are the fastest among solids and liquids. B. The speed of the particles is not affected by temperature. C. The speed of the particles is the same in all states of matter. D. Solid particles are the fastest to move compared to liquid and gas. 12. Given this particle model of water, what do you think is the state it is in? A. Gas B. Liquid C. Solid D. Cannot be determined 13. What do you call the process of changing a solid into liquid by heating it? A. Condensation B. Freezing C. Evaporation D. Melting 14. What term describes the process of a liquid changing into a gas at its surface? A. Condensation B. Freezing C. Evaporation D. Melting 15. What is the opposite process of freezing? A. Boiling B. Condensation C. Evaporation D. Melting 16. What happens to the particles of a substance during melting? A. Gain energy and move faster B. Lose energy and move slower C. Don\'t change their energy or arrangement D. Change their arrangement but not their speed 17. Which of the following is NOT a factor affecting condensation? A. Pressure C. The color of the surface B. Temperature D. Presence of the water vapor in the air 18. What do you call the series of steps designed to help you solve problems and answer questions? A. A. Experiment B. Hypothesis C. Observation D. Scientific Method 19. Which question would be the best high-level Scientific question? A. How many giraffes live in Africa? B. Who made the first microscope? C. How long ago did dinosaurs live on Earth? D. Does the amount of salt in water affect the temperature at which it boils? 20. In science, an educated guess is called a/an \_\_\_\_\_\_\_\_\_\_\_\_\_. A. Conclusion B. Hypothesis C. Observation D. Question 21. Anything that can change in an experiment is called\_\_\_\_\_\_\_\_\_. A. Conclusion B. Hypothesis D. Experiment D. Variable 22. All good experiments should be \_\_\_\_\_\_\_\_\_\_\_\_\_. A. Explainable B. Testable D. Thoughtful D. Questionable. 23. What is the appropriate unit to measure the volume of a liquid? A. Liters B. Kilograms C. Newtons D. Meters 24. If you want to measure the mass of an object, which unit would you use? A. Celsius B. Centimeters C. Kilograms D. Liters 25. What is needed to accurately represent all physical quantities? A. a base unit and a number B. a unit and a numerical magnitude C. an SI unit and a numerical magnitude D. a unit and a number expressed in standard form (scientific notation) 26. What is the solvent in a cup of milk? A. Sugar B. Water C. Milk powder D. Sugar and milk 27. Which is an example of a solution? A. Blood B. Cooked flour C. Marshmallow D. Seawater 28. The two components of a solution are solute and solvent. Which statement describes the solute? A. It is the solid formed in a solution. B. It is the liquid component of the solution. C. It is the component of a solution in bigger quantity D. It is the component of a solution in smaller quantity. 29. In a solution, what do you call the substance in a larger amount? A. Salt B. Solute C. Solvent D. Sugar 30. Which happens if you mix juice powder with water? A The juice powder will form a layer. B. The juice powder will dissolve in water. C. The juice powder will not dissolve in water D. The juice powder will settle at the bottom of the water. **Page 2 of Page 4** 31\. 1. Which of the following best describes percent by volume? A. The amount of space occupied by matter. B. The amount of matter in an object C. It is the amount of solute in each mass of solution expressed in grams solute per 100 grams\ solution. D. It is the volume of solute in each volume of solution expressed in milliliters solute per 100\ milliliters of solution. 32\. Which of the following best describes percent by mass? A. The amount of space occupied by matter. B. The amount of matter in an object. C. It is the amount of solute in each mass of solvent expressed as grams solute per 100\ milliliters. D. It is the amount of solute in each volume of solution expressed as grams solute per 100\ milliliters. 33\. You are walking along the path of the school, and suddenly found 2-peso coins. The coin is a nickel-plated steel solid solution made by dissolving 2.5 g of nickel in 8.5 g of copper. Solve for the mass percent of nickel. A. 22.73 % B. 23 % C. 24.50 % D. 25.5 % 34\. All the following describes a solution **EXCEPT** A. Clear B. Homogeneous C. Cannot pass through filter paper D. Can be separated by physical means. 35\. Homogeneous and heterogeneous mixtures are different because \_\_\_\_\_\_\_\_. A. Heterogeneous has 2 substances while homogeneous has 3 or more substances. B. Heterogeneous looks the same throughout, with homogeneous you can see the different parts. C. Homogeneous looks the same throughout, with heterogeneous you can see the different parts. D. Both have an equal number of substances. 36\. What type of solution has small amount of solute, and more solute would dissolve if added? A. Concentrated B. Saturated C. Supersaturated D. Unsaturated 37\. How will you prepare an unsaturated solution? A. Freeze the mixture B. Stir the powder in the liquid C. Add a smaller amount of powder to the liquid D. Add more solute in a lower amount of solvent 38\. All the following affects the solubility of a solid in a liquid **EXCEPT:** A. Temperature B. Pressure C. Stirring D. Surface area 39\. What is the maximum amount of solute that can be dissolved in a fixed amount of solvent at a given temperature? A. Dilution B. Dissolution C. Percent by mass D. Solubility 40\. Which method below will not speed up the rate of salt dissolving in water? A Stirring the solute into the solvent. B. Increasing the surface area of the solute C. Decreasing the temperature of the solvent D. Heating the solvent before adding the solute 41\. Which factor would **NOT AFFECT** the solubility of sugar in water? A. Add salt to water C. Heat the water and sugar B. Stir the water and sugar D. Grind the sugar to make it finer 42\. Imagine that you performed an experiment in which you dissolved different samples of sugar (sugar cubes, extra fine sugar ad regular table sugar) into water samples to compare how Long they took to dissolve. What factor would be at least important to the design of this experiment? A. All samples must be tested exactly at the same time. B. All water samples must have the same temperatures. C. The sugar samples must contain sugar and water only. D. The same amount of sugar must be placed in each sample. 43\. Which process or processes affects the speed of dissolving? A. Stirring only\ B. Particle size only\ C. Type of container used\ D. Particle size, temperature, stirring.\ 44. Which of the following word pairs correctly completes the sentence below?\ \_\_\_\_\_\_\_ are corrosive substances characterized as having a strong smell, a sour taste, and a \_\_\_\_\_\_\_.\ A. Acids; Ph less than 7 C. Bases; pH less than 7\ B. Acids; pH greater than 7 D. Bases greater than 7\ 45. What happen to the red litmus paper when dip in salt solution?\ A. Turns blue C. Turns yellow\ B. Turns green D. No change in color\ 46. If an acid is combined with a base of equal strength, the result will most likely be\_\_\_\_\_\_\_.\ A. a neutral solution C. a stronger base\ B. a stronger acid D. impossible to tell without testing the Ph\ 47. A household cleaner has a pH around 10. It would be considered\_\_\_\_\_\_\_\_\_\_\_\_.\ A. a base B. a liquid C. an acid D. neutral **Page 3 of page 4** 48\. Distilled water with a pH of 7 is \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.\ A. a salt B. an alkali C. an acid D. neutral 49\. What is the name of this piece of equipment? A. Beaker\ B. Conical flask\ C. Evaporating basin\ D. Measuring cylinder 50\. What are the science equipment uses for measuring?\ A. Graduated cylinder, funnel, beaker\ B. Graduated cylinder, funnel, test tube\ C. Erlenmeyer flask, graduated cylinder, beaker\ D. Erlenmeyer flask, graduated cylinder, test tube rack **GOODLUCK YOUNG LEARNERS!!!**  PREPARED BY: **[MAILA F. BUTAC]** **[MELINDA E. MANIO]** Science 7 Teachers CHECKED BY: [**ANNALYN R. DOMINGO**] NOTED: **[MELANNIE T. SANGOYO, PhD]** Head Teacher III Principal III **Page 4 of page 4** **ANSWERS KEY\ ** 1. D 2. D 3. A 4. C 5. C 6. B 7. D 8. A 9. A 10. C 11. A 12. A 13. A 14. C 15. A 16. A 17. C 18. D 19. D 20. B 21. D 22. B 23. A 24. C 25. B 26. B 27. D 28. C 29. C 30. B 31. D 32. D 33. A 34. D 35. C 36. D 37. C 38. B 39. D 40. C 41. A 42. A 43. D 44. A 45. D 46. A 47. A 48. D 49. A 50. C **\ **