Grade 8 Science Diagnostic Test.pdf

Grade 8 Science Diagnostic Test Section 1: Multiple Choice Questions 1. What is the main source of energy for the Earth? o A) The Moon o B) The Sun (Correct Answer) o C) The Oceans o D) The Wind 2. Which of the following is a non-renewable energy source?...

Grade 8 Science Diagnostic Test Section 1: Multiple Choice Questions 1. What is the main source of energy for the Earth? o A) The Moon o B) The Sun (Correct Answer) o C) The Oceans o D) The Wind 2. Which of the following is a non-renewable energy source? o A) Solar power o B) Wind power o C) Coal (Correct Answer) o D) Hydroelectric power 3. What is the force that pulls objects toward the Earth's center? o A) Magnetism o B) Gravity (Correct Answer) o C) Friction o D) Electricity 4. What is the primary gas found in the Earth's atmosphere? o A) Oxygen o B) Carbon Dioxide o C) Nitrogen (Correct Answer) o D) Hydrogen 5. Which of the following describes a physical change? o A) Burning wood o B) Rusting iron o C) Melting ice (Correct Answer) o D) Baking bread 6. Which of the following is a chemical change? o A) Melting ice o B) Burning wood (Correct Answer) o C) Dissolving sugar in water o D) Breaking a glass 7. What is the most abundant element in the Earth's crust? o A) Oxygen (Correct Answer) o B) Carbon o C) Hydrogen o D) Nitrogen 8. Which force is responsible for keeping the planets in orbit around the Sun? o A) Magnetic Force o B) Frictional Force o C) Gravitational Force (Correct Answer) o D) Electrical Force 9. Which process is primarily responsible for the formation of clouds?  o A) Condensation (Correct Answer) o B) Evaporation o C) Sublimation o D) Freezing 10. What is the primary function of the roots in a plant? A) To produce flowers B) To absorb water and nutrients from the soil (Correct Answer) C) To carry out photosynthesis D) To release oxygen 11. Which of these best describes the function of chloroplasts in plant cells? A) To store energy B) To produce proteins C) To conduct photosynthesis (Correct Answer) D) To protect the cell 12. What is the function of the respiratory system in the human body? A) To digest food B) To supply oxygen to the blood and remove carbon dioxide (Correct Answer) C) To circulate blood throughout the body D) To support and protect body organs 13. Which state of matter has neither a definite shape nor a definite volume? A) Solid B) Liquid C) Gas (Correct Answer) D) Plasma 14. What type of energy transformation occurs in photosynthesis? A) Kinetic energy to thermal energy B) Chemical energy to light energy C) Light energy to chemical energy (Correct Answer) D) Mechanical energy to electrical energy 15. Which layer of the Earth is made up of molten iron and nickel? A) Crust B) Mantle C) Outer Core (Correct Answer) D) Inner Core Section 2: True or False Questions 6. True or False: Water boils at 100°C at sea level. (Correct Answer: True) 7. True or False: Plants produce their own food through a process called photosynthesis. (Correct Answer: True) 8. True or False: The Earth revolves around the Moon. (Correct Answer: False) 9. True or False: Metals are good conductors of electricity. (Correct Answer: True) 10. True or False: All living things are made up of cells. (Correct Answer: True) Section 3: Short Answer Questions 11. Describe what happens to water when it freezes. 12. Explain why the Moon appears to change shape over the course of a month. 13. List three examples of renewable energy sources. 14. Name the three states of matter and provide an example of each. 15. Explain the difference between a producer and a consumer in an ecosystem. Section 4: Diagram-Based Question 16. Draw and label the parts of a plant cell, including the cell wall, chloroplasts, and nucleus. Section 5: Application Questions 17. If you drop an object, why does it fall to the ground? Explain in terms of gravity. 18. Why is it important for living organisms to have water? Provide at least two reasons. Section 6: Matching Questions 19. Match the term to the correct definition: A) Evaporation B) Photosynthesis C) Condensation D) Erosion 1. The process by which water changes from liquid to gas 2. The process by which plants make their own food using sunlight 3. The change of water vapor into liquid water 4. The wearing away of the Earth's surface by wind or water