PHYSICS [5 Mark Question Answer]

(a) The law of conservation of energy states that the amount of energy is neither created nor destroyed. For example, when you roll a toy car down a ramp and it hits a wall, the energy is transferred from kinetic energy to potential energy.
(b) Energy can neither be created nor destroyed. It can only be transformed from one to another is the law of conservation of energy. For example , object falling from certain height converts its potential energy to kinetic energy and at all instant total mechanical energy remains constant.
(c) A roller coaster operates on the law of conservation of energy. Initially, some work is done to put the roller coaster car at the top position. This work done is stored in the roller coaster car in the form of potential energy. But it’s kinetic energy is zero due to its stationary position.

(a) Chemical energy into light energy – Voltaic cell
(b) Electric energy into heat energy – Electric bulb
(c) Heat energy into Electric energy – Electric generator.
(d) Electric energy into magnetic energy – Electromagnet
(e) Electric energy into light energy – Electric bulb
(f) light energy into electric energy – Photo-voltaic cell
(g) Electric energy into sound energy – Loudspeaker
(h) light energy into chemical energy – Photosynthesis

(a) Light energy: Light energy is a kind of kinetic energy capable of allowing various forms of lights visible to the human eyes. Light is known as a type of electromagnetic radiation produced by hot objects such as lasers, bulbs and sunlight.
A light bulb, the glowing tubes in a toaster, the sun, and even automobile headlights are examples of light energy.
(b) Electric energy: is the energy (both kinetic and potential) in the charged particles of an atom that can be used to apply force and/or do work. That means that electrical energy has the capacity to move an object or cause an action.
Lightning, during a thunderstorm, is an example of electrical energy.
(c) Magnetic energy: A magnet is capable of causing motion in the magnetic substances, it has an energy which may be called magnetic energy.
Example- Magnetic energy is used in electromagnets fixed in the cranes to lift heavy loads of iron or separate iron scrap from the heap of waste material
(d) Chemical energy: It is the energy that is stored in the bonds of chemical compounds such as atoms and molecules. Chemical energy is released when a substance undergoes a chemical reaction and produces heat mostly in the form of a by-product.
Examples of stored chemical energy are biomass, batteries, natural gas, petroleum, and coal.
(e) Nuclear energy: Nuclear energy is a form of energy released from the nucleus, the core of atoms, made up of protons and neutrons.
Medical Diagnosis and Treatment are the examples of nuclear energy.