O level physics

O level physics Watt - CORRECT ANSWER-The power of a device to convert 1 joule of energy from one form to another in 1 second Power - CORRECT ANSWER-It is the rate of doing work Power (in terms of energy ) - CORRECT ANSWER-It is the rate of transfer of energy Quicker response (thermometry) - CORRECT ANSWER-This measures how quickly the thermometer register changes in temperature Sensitivity (thermometry) - CORRECT ANSWER-This measures the amount of change in thermometric property Linearity (thermometry) - CORRECT ANSWER-When a thermometer changes by equal amounts for same rise in temperature Range (thermometry) - CORRECT ANSWER-Denotes the minimum and maximum temperatures that the thermometer can measure Conduction - CORRECT ANSWER-The flow of heat through matter without movement of matter as a whole Convection - CORRECT ANSWER-The flow of heat through a fluid by movement of the fluid itself Radiation - CORRECT ANSWER-The flow of heat by means of electromagnetic waves Evaporation - CORRECT ANSWER-The process by which liquid molecules which possess sufficient energy overcome the attractive forces between the molecules escape from the surface of the liquid Boyle's Law - CORRECT ANSWER-It states that for a fixed mass of gas at constant temperature, the pressure exerted by the molecules is inversely proportional to the volume occupied by the gas Heat capacity - CORRECT ANSWER-It is the amount of energy required to increase the temperature of the whole substance by 1°C/K Specific heat capacity - CORRECT ANSWER-It is the amount of energy required to increase the temperature of unit mass of that substance by 1°C /K Melting - CORRECT ANSWER-The process during which a solid changes to a liquid without change in temperature Boiling - CORRECT ANSWER-The process during which a liquid changes to a gas without any change in temperaturei Solidification - CORRECT ANSWER-The process during which a liquid changes to a solid without ang change in temperature Condensation - CORRECT ANSWER-The process during which a gas changes to a liquid without any change in temperature Specific latent heat of fusion - CORRECT ANSWER-The amount of heat energy required to convert unit mass of a substance from the solid state to the liquid state without any change in temperature Specific latent heat of vaporisation - CORRECT ANSWER-The amount of heat needed to change unit mass of a substabce from liquid state to gaseous state without any change in temperature Pressure law - CORRECT ANSWER-The pressure of a fixed mass of gas at constant volume is directly proportional to the absolute temperature Phyiscal quantity - CORRECT ANSWER-A quantity which can be measured Scalar quantity - CORRECT ANSWER-A quantity which is fully described bu a magnitude and a unit Vector quantity - CORRECT ANSWER-A quantity which is fully described by a magnitude, a unit and a direction Displacement - CORRECT ANSWER-It is the distance measured from a fixed point Speed - CORRECT ANSWER-It is the distance travelled per unit time Velocity - CORRECT ANSWER-The rate of change of displacement Acceleration - CORRECT ANSWER-The rate of change of velocity Gravitational field - CORRECT ANSWER-A region in space where a body experiences a gravitational force of attraction Gravitational field strength - CORRECT ANSWER-It is the gravitational force acting per unit mass at a point Weight - CORRECT ANSWER-It is the gravitational force of attraction acting on a body Mass - CORRECT ANSWER-A measure in the amount of substance in a body Density - CORRECT ANSWER-Mass per unit volume Newton's 3rd law of motion - CORRECT ANSWER-If body A exerts a force on body B, then body B exerts an equal force of the same nature but in opposite direction on body A Terminal velocity - CORRECT ANSWER-The final constant velocity reached by a falling body when the air resistance force becomes equal but opposite to the weight of the body Thinking distance - CORRECT ANSWER-The distance moved forward by the car during the time interval that the hazard is seem and the driver applies the brake Braking distance - CORRECT ANSWER-The distance covered by a car when the brakes have been applied and the car is at rest Stopping distance - CORRECT ANSWER-Braking distance + thunking distance Centripetal acceleration - CORRECT ANSWER-The constant acceleration directed towards the centre of the circular path possessed by a body moving in a circular path Principle of moment - CORRECT ANSWER-It states that if a body is in rotational equilibrium the sum of the cloclwise moment about a point is equal to the sum of anti-clockwise moment about that same point Centre of gravity - CORRECT ANSWER-The point at which the whole weight of a body may be considered to act Stable equilibrium - CORRECT ANSWER-When a body returns to its original position after being given a small displacement Unstable equilibrium - CORRECT ANSWER-When a body moves firther away from its original position when it is given a small displacement Neutral equilibrium - CORRECT ANSWER-When there is no tendency for a body to return to its original position or to move further away when it is given a small displacememt Elastic material - CORRECT ANSWER-It is a material which returns to its original shape and size when the deforming force is removed Plastic material - CORRECT ANSWER-A material which does not return to its original shape and size when the deforming force is removed; it aquires a permanent deformation Hooke's law - CORRECT ANSWER-It states that when a ductil