1.
How can we preserve electrical energy?
Correct Answer
B. Turning off lights and tvs...... recycling
Explanation
By turning off lights and TVs when they are not in use, we can conserve electrical energy. This is because when these appliances are left on, they continue to consume electricity even if they are not being actively used. Recycling also helps in preserving electrical energy as it reduces the need for manufacturing new products from raw materials, which requires a significant amount of energy.
2.
What is stored energy?
Correct Answer
D. Potential
Explanation
Potential energy is a form of stored energy that an object possesses due to its position or state. It is the energy that an object has the potential to release or use. In the context of the given options, thermal energy refers to the energy associated with heat, radiant energy refers to electromagnetic radiation, and chemical energy refers to the energy stored in chemical bonds. However, potential energy is the most appropriate option as it encompasses the concept of stored energy in a general sense.
3.
What types of energy is in a battery?
Correct Answer
B. Chemical
Explanation
Batteries store and release energy through a chemical reaction. When a battery is charged, a chemical reaction occurs that stores energy. When the battery is used, the stored energy is converted back into electrical energy through another chemical reaction. Therefore, the correct answer is chemical energy. Mechanical, thermal, and magnetic energy are not typically associated with batteries.
4.
If a ball is being throw up in the air what two types of energy is happening.
Correct Answer
C. Kinetic and potentail
Explanation
When a ball is thrown up in the air, it possesses both kinetic energy and potential energy. Kinetic energy is the energy associated with the ball's motion, as it moves upwards. Potential energy is the energy stored in the ball due to its position or height above the ground. As the ball rises, its kinetic energy decreases while its potential energy increases. Therefore, the correct answer is kinetic and potential energy.
5.
What kind of energy do stereos have?
Correct Answer
D. Sound
Explanation
Stereos have sound energy because they are designed to produce and amplify sound. They convert electrical signals into sound waves through speakers, allowing us to hear music or other audio. While stereos may require other forms of energy, such as electrical or mechanical energy, the primary purpose and output of a stereo is sound energy.
6.
What type of energy do flashlights start with?
Correct Answer
B. Electrical
Explanation
Flashlights start with electrical energy because they require a power source, typically batteries, to produce the necessary electrical current to power the light bulb. The batteries convert chemical energy into electrical energy, which is then used to produce light.
7.
What energy do plants have?
Correct Answer
B. Chemical
Explanation
Plants have chemical energy because they undergo photosynthesis, a process that converts sunlight into glucose molecules. These glucose molecules store energy in their chemical bonds, which can be used by the plant for growth, reproduction, and other metabolic activities. Chemical energy is essential for plants to carry out their life processes and is the main source of energy for all living organisms in the food chain.
8.
What energy do you have when you eat?
Correct Answer
A. Chemical
Explanation
When you eat, the energy that you obtain from food is in the form of chemical energy. This energy is stored in the bonds of the molecules present in the food, such as carbohydrates, proteins, and fats. Through the process of digestion and metabolism, these molecules are broken down, releasing the stored chemical energy, which is then used by the body for various functions like growth, movement, and maintaining body temperature. Therefore, the correct answer is chemical energy.
9.
Using the pedals on your bike is what type of energy?
Correct Answer
B. Mechanical
Explanation
When you pedal on your bike, you convert the chemical energy from your body into mechanical energy. This mechanical energy is then used to propel the bike forward. Therefore, the correct answer is mechanical energy.
10.
During the day the sun gives off what?
Correct Answer
C. Thermal
Explanation
During the day, the sun gives off thermal energy. This is because the sun is a massive ball of hot gases that emits heat and light. The thermal energy from the sun is responsible for heating the Earth's surface and atmosphere, causing temperature variations and driving weather patterns.
11.
When an object is in motion what type of energy dose the object have?
Correct Answer
A. Kinetic
Explanation
When an object is in motion, it possesses kinetic energy. Kinetic energy is the energy associated with the motion of an object. It depends on the mass and velocity of the object. The faster an object moves or the heavier it is, the more kinetic energy it possesses. Therefore, in this scenario, the correct answer is kinetic.
12.
Where does most of the earths energy come from?
Correct Answer
D. The sun
Explanation
Most of the earth's energy comes from the sun. The sun is the ultimate source of energy for all life on earth. It provides heat and light, which are essential for various processes such as photosynthesis in plants, which in turn provide food for other organisms. The sun's energy also drives weather patterns, ocean currents, and the water cycle, among other natural phenomena. Without the sun, life on earth would not be possible.
13.
The movement of electric charges is :
Correct Answer
D. Electrical energy
Explanation
The movement of electric charges refers to the flow of electrons or other charged particles through a conductor. This movement generates electrical energy, which can be used to power various devices and perform work. Electrical energy is the form of energy associated with the flow of electric charges and is typically converted into other forms, such as mechanical energy or thermal energy, to perform useful tasks.
14.
Heat is the transfer of energy.
Correct Answer
A. True
Explanation
Heat is the transfer of energy from one object or substance to another due to a temperature difference. It occurs when there is a flow of thermal energy from a region of higher temperature to a region of lower temperature. This transfer of energy can occur through conduction, convection, or radiation. Therefore, it is correct to say that heat is the transfer of energy.
15.
A _________________________ is an example of chemical energy that turns into thermal energy and gives off light and heat.
Correct Answer
A. A candle
Explanation
A candle is an example of chemical energy that turns into thermal energy and gives off light and heat. When a candle burns, the heat is produced through a chemical reaction between the wax and the oxygen in the air. This heat energy is then transferred to the surroundings, resulting in the emission of light and heat.