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Question 1: In physics, what is the formal definition of energy?
- The capacity to do work
- The speed of an object
- The weight of a substance
- The temperature of matter
Answer: A. The capacity to do work
Explanation: Energy is defined in science as the capacity or ability to perform work. Work itself is the transfer of energy through force and distance.
Question 2: What is the standard unit of energy used in physics?
- Volt
- Watt
- Joule
- Newton
Answer: C. Joule
Explanation: The joule is the standard unit of energy in the International System of Units, defined as the work done by a force of one newton moving an object one meter.
Question 3: What does the law of conservation of energy state?
- Energy can be created
- Energy cannot be created or destroyed
- Energy is always lost as heat
- Energy can be destroyed
Answer: B. Energy cannot be created or destroyed
Explanation: Gravitational potential energy is the energy held by an object because of its vertical position or height relative to a reference point like the Earth's surface.
Question 4: Which of these is a primary form of stored energy?
- Radiant energy
- Kinetic energy
- Thermal energy
- Potential energy
Answer: D. Potential energy
Explanation: The Sun provides radiant energy that drives photosynthesis in plants, which serves as the foundational energy source for nearly all food chains and ecosystems on our planet.
Question 5: What type of energy is stored in the bonds of atoms and molecules?
- Electrical energy
- Chemical energy
- Radiant energy
- Thermal energy
Answer: B. Chemical energy
Explanation: The Law of Conservation of Energy is a fundamental principle in physics stating that the total energy in an isolated system remains constant over time regardless of transformations.
Question 6: Electrical energy is delivered by the movement of which particles?
- Electrons
- Protons
- Neutrons
- Atoms
Answer: A. Electrons
Explanation: Electrical energy is generated and transported through the movement of tiny, negatively charged subatomic particles known as electrons flowing through a conductive material like copper wire.
Question 7: What is another common name for thermal energy?
- Heat
- Light
- Force
- Motion
Answer: A. Heat
Explanation: Thermal energy, often perceived as heat, is the internal energy of an object resulting from the kinetic energy of its vibrating atoms and molecules at the microscopic level.
Question 8: Visible light is an example of which type of energy?
- Potential energy
- Radiant energy
- Electrical energy
- Chemical energy
Answer: B. Radiant energy
Explanation: Kinetic energy is defined as the energy that an object possesses due to its motion, which depends on both the mass and the velocity of the moving object.
Question 9: What happens to an object's kinetic energy as it moves faster?
- It disappears
- It decreases
- It stays the same
- It increases
Answer: D. It increases
Explanation: A flashlight converts the chemical potential energy stored within the battery into electrical energy, which is then transformed into light energy by the bulb or LED.
Question 10: What does a battery primarily do?
- Stores thermal energy only
- Converts chemical to electrical energy
- Destroys kinetic energy
- Creates new energy
Answer: B. Converts chemical to electrical energy
Explanation: A battery functions as a portable storage device by converting the chemical energy stored within its internal chemical components into electrical energy to power various electronic devices.