Which of the following statements best described how sound energy is produced? * It is produced by making vibrations. It is produced from muscles, wind, and machines. It is produced from sunlight, magnets, and dry cell. It is produced using electricity, generators, and batteries An ultrasound produces echo which is an example of sound energy. Why is ultrasound used by hospitals and lying-in clinics? * To prevent premature delivery of the baby To give warmth to the baby inside a mother’s womb To show the developing baby inside a mother’s womb To change the baby’s position inside a mother’s womb Why is sound energy important to all living things? * It makes work easier. It enables us to do work. It can make communication easy. It enables us to understand what is going on around us. How does light energy reach us? * Light travels alone. Light energy moves straight. Light reaches us by converting into sound. Light reaches us in the form of light or radiant energy that travels by electromagnetic (EM) waves. Which form of energy is the main source of light on earth? * fire energy sound energy electrical light energy When a battery is charged, how does electrons move or travel? * It travels in three directions. It travels in many directions. It travels in different directions. It travels in one direction in and out of the battery. Which situation will show heat transfer by radiation? * boiling of water ironing of clothes roasting chicken sunbathing during summer Heat energy released to the environment may __________. * still be recovered spread out indefinitely cause increase in temperature result in the lowering of air temperature Heat energy has many uses. Which of the following is NOT a use of heat energy? * Heat energy is used to warm the surroundings Heat energy is used to generate electricity Heat energy is used for communication. Heat energy is used for cooking. Why is it important for us to spend a while under the sunlight especially early in the morning? * To keep you dry To illuminate your house To see who is outside the house To boost your energy and help keep you calm, positive, and focused
