Republic of the Philippines Department of Education Region I Schools Division of Ilocos Norte District of Sarrat PANDAN INTEGRATED SCHOOL Sarrat 1st Periodical Test in Science 8 S.Y. 2022 - 2023 Name: ________________________________ Grade and Section:____________ Date: __________ Score: _____ Test I. MULTIPLE CHOICE. Choose the letter of the best answer. Write your answer on the space provided before each number. 1. Which is not a unit of force? a. Dyne b. Joules c. Newton d. Pound 2. What refers to how large or strong is the force? a. magnitude b. line of action c. velocity of object d. direction of the force 3. What force is always directed opposite to the motion of an object? a. friction b. gravitational c. magnetic d. tension 4. What force pulls an object back to the Earth? a. applied b. gravitational c. magnetic d. tension 5. Which surface would be easiest for a bicycle to move? a. sand b. grass c. muddy road d. concrete road 6. What type of forces holds between two celestial bodies like the Sun and Earth? a. applied b. gravitational c. magnetic d. tension 7. What force acts perpendicular to the surface of the object in contact with? a. applied b. gravitational c. normal d. tension 8. Two people pull on a rope in a tug – of – war. Each pull with a 300N force. a. 0 N b. 300 N c. 600 N d. 900 N 9. Planet Jupiter has a bigger mass than the Earth. If you were able to travel to Planet Jupiter, what happens to your weight? a. increases b. decreases c. stays the same d. varies with day and night 10. What is the definition of weight? a. the size of an object c. the amount of matter on an object b. the time it takes to get on a ride d. the magnitude of the force of gravity on an object 11. Which law states that forces act with equal magnitude and in opposite direction? a. Law of Inertia c. Law of Acceleration b. Law of Interaction d. Law of Gravitational Force 12. For every ___________ there is an equal and opposite _____________. a. action, action c. action, reaction b. reaction, action d. reaction, reaction 13. What Newton’s Law of motion requires the use of seat belt in cars? a. Law of Inertia c. Law of Acceleration b. Law of Interaction d. Law of Gravitational Force 14. A guava with a mass of 0.200kg has a weight of __________________. a. 0.200N b. 1.96N c. 4.50N d. 10N 15. Which of the following factors does the speed of sound depend? a. density b. elasticity c. temperature d. all of the above 16. What happens to the speed of sound as the temperature increases? a. constant b. decreases c. increases d. cannot be determined 17. Which of the following is true about the effect of air temperature on the speed of sound? a. The lower the temperature, the faster the speed. b. The higher the temperature, the faster the speed. c. The higher the temperature, the slower the speed. d. The temperature does not affect the speed of sound. 18. Sound travels faster through warm materials than cold materials because _____________. a. warm particles move slowly c. warm particles are moving quickly b. gas particles are packed tightly d. sound does not travel faster through a warm substance 19. What is the reason for hearing noises in the distance while standing near a body of water during night time? a. There are fewer noises at night c. Sound bounces off better at night b. Water conducts sound better d. Sound waves are bent towards the cool air over the water. 20. Which is quieter, a room with hanging curtains or one with bare concrete walls? Why? a. Bath rooms have the tendency to be peaceful and to be quiet depending on the location. b. It is quieter in a room with concrete walls because sound travels faster in medium with higher elastic property at the molecular level. c. It is quieter in a room with curtains because the bare concrete wall brings about multiple reflections of sound. d. It is quieter in a room with bare walls because hanging curtains enhance the effect of sound reverberation. 21. Nina sent an arrow beam of light through a prism. As a result, she observed light dispersing into ____________. a. four colors c. five colors b. three colors d. seven colors 22. Which of the following arrangements of visible light colors shows decreasing wavelength? a. red, orange, yellow, green, blue, indigo, violet b. red, yellow, green, orange, violet, blue, indigo c. violet, blue, green, orange, red, indigo, yellow d. violet, indigo, blue, green, orange, yellow, red 23. A ray of light passes through a glass block. When it passes through the glass, it changes direction. Which of the refracted rays A, B, C or D is most likely to leave the glass block? D A B C a. A b. B c. C d. D 24. Why is sand hotter than water at day time but colder at night? a. Sand is solid, while water is liquid. b. Sand and water have equal specific heats. c. Sand has a lower specific heat than water. d. Sand has higher specific heat than water. 25. During warm days, you cool yourself by damping your skin with a wet towel. Which of the following takes place? a. Wet towel has no effect on your body. b. Wet towel releases heat energy to your body. c. Wet towel absorbs heat energy from the body. d. Wet towel has the same temperature as your body. 26. What happens to the current across a circuit when the voltage is doubled while the resistance is held constant? a. tripled b. halved c. doubled d. remains the same 27. Which of the following statements is correct about relationship of voltage and current? a. Current varies directly with voltage and resistance is changing. b. Current varies indirectly with voltage and resistance is changing. c. Current varies directly with voltage when resistance remains constant. d. Current varies indirectly with voltage when resistance remains constant. 28. What type of conducting wire ahs the greatest resistance to the flow of current? a. thin, long wire c. thin, short wire b. thick, long wire d. thick, short wire 29. What is the voltage of a circuit that has a resistance of 6ῼ and a current of 2mA? a. 9V b. 10V c. 11V d. 12V 30. What is the electric current if a circuit has a resistance of 100 ῼ and a voltage of 6.00V? a. 0.0600 A b. 4.50 A c. 6.00 A d. 12.5 A 31. The following are advantages of a series circuit EXCEPT: a. Series circuit do not overheat easily. b. Easy to install and easy to repair and maintain. c. All loads in a series circuit have the same current. d. If one load fails, all loads in the circuit will not function. 32. The following are true about parallel circuit EXCEPT: a. Voltage is constant across the circuit. b. Total resistance is less than the smallest resistance in the circuit. c. Total resistance is greater than the largest resistance in the circuit d. Total current is the sum of current passing through all the loads in the circuit. 33. Which of the following is connected in series with the load at home? a. TV b. switch c. light bulbs d. refrigerator 34. Which of the following is correct, when the resistance of 1.0 ῼ, 2.0 ῼ, and 3.0 ῼ are connected in a series circuit? a. The total resistance is less than 1.0 ῼ. c. The total resistance is less than 3.0 ῼ. b. The total resistance is less than 2.0 ῼ d. The total resistance is greater than 3.0 ῼ. 35. The following are connected in parallel circuit at home EXCEPT: a. TV. b. light bulbs c. refrigerator d. Christmas lights Test II. Write TRUE if the statement is correct and FALSE if not. Write your answer on space provided before each number. ____________ 36. A circuit breaker automatically shuts down if there is overloading in the circuit. ____________ 37. If you happen to touch an uninsulated wires with your bare hands, it is safe if it has low current. ____________ 38. It is safe to consume 35A of a current if the fuse has only 30A capacity. ____________ 39. Short circuit happens when a live wire is in direct contact with the metal casing of the appliances. ____________ 40. Earthing protects the appliance user from the grounded appliances. Test III. State the advantages and disadvantages when the manner of using extension wires at home is the same with what is shown in figure 5. Write your answers on a separate sheet of paper. Advantages: ________________________________________________________________________ __________________________________________________________________________________ __________________________________________________________________________________ Disadvantages: __________________________________________________________________________________ __________________________________________________________________________________ __________________________________________________________________________________ Rubric for Scoring 10 points - Discussions are conceptually complete. 5 points - Discussions are conceptually incomplete. 0 - No discussion
