Physics

Question 1

Absolute humidity

Answer 1

Mass of water vapour present in a volume of gas at a given temperature (kg m-3)

Question 2

Relative humidity

Answer 2

Ratio of water vapour present in the gas relative to the max amount of water vapour the gas could contain (%)

Question 3

Absolute zero

Answer 3

Lowest possible T and all thermal motion stops = 0K and -273C

Question 4

Ampere

Answer 4

Amount of electric charge passing a given point per unit time (1 coulomb per second)

Question 5

Coulomb

Answer 5

Amount of charge passing a given point per second when 1A of current is flowing

Question 6

Boiling point

Answer 6

Temperature at which vapour pressure of a liquid equals surrounding ambient pressure and the liquid changes to vapour

Question 7

Calorie

Answer 7

Amount of energy required to increase the temperature of 1g of water by 1C
1 calorie = 4.16J

Question 8

Candela

Answer 8

Luminous intensity of light in a given direction of a source that emits monochromatic radiation of frequency 540x10 to the 12 hertz and radiant intensity of 1/683 watts per second

Question 9

Critical temperature

Answer 9

Temperature at which a gas cannot be liquefied by pressure alone

Question 10

Freezing point

Answer 10

Temperate at which liquid and solid are in equilibrium at a given pressure

Question 11

Force

Answer 11

Mass x acceleration
Change state of motion
1N is force required to accelerate 1kg at a rate of 1 m per second squared

Question 12

Gas

Answer 12

Substance above critical T

Question 13

Heat capacity

Answer 13

Amount of heat required to raise the T of an object by 1C

Question 14

Hertz

Answer 14

1 cycle per second

Question 15

Joule

Answer 15

Work done to an object when applying a force of 1N through a distance of 1m

Question 16

Kelvin

Answer 16

1/273 of the thermodynamic scale temperature of the triple point of water

Question 17

Kilogram

Answer 17

Piece of platinum alloy in Sevres

Question 18

Kinetic energy

Answer 18

Energy a body processes because of motion

Question 19

Latent heat

Answer 19

Energy released or absorbed by a substance when it changes phase at a given temperature

Question 20

Latent heat of fusion

Answer 20

Amount of heat required to convert a unit mass of solid at its melting point into a liquid without an increase in temperature

Question 21

Latent heat of vaporisation

Answer 21

Amount of heat required to convert a unit mass of a liquid at its boiling point into a vapour without an increase in temperature

Question 22

Mass

Answer 22

Amount of matter contained in a body
Kg

Question 23

Metre

Answer 23

Length of the path travelled by light in a vacuum during the time interval of 1/300,000,000 of a second

Question 24

Mole

Answer 24

Quantity containing the same number of particles as there are atoms in 12g of carbon 12. 6.022x10 to 23

Question 25

Momentum

Answer 25

Mass x velocity

Question 26

Ohm

Answer 26

Resistance between two points of a conductor when a PD of 1 volt is applied to produce a current of 1amp

Question 27

Pascal

Answer 27

1Pa = 1N over 1m3

Question 28

pH

Answer 28

Negative logarithm to the base 10 of hydrogen ion concentration in a solution

Question 29

Potential energy

Answer 29

Energy of a body or a system to do work

Question 30

Power

Answer 30

1J per second Rate or doing work

Question 31

Resistance

Answer 31

Property of a conductor to oppose flow

Question 32

SVP

Answer 32

Pressure exerted by a vapour when in equilibrium with its liquid phase within a closed system at a given temperature

Question 33

Second

Answer 33

Frequency of radiation emitted by caesium-133 in its ground state

Question 34

Specific heat capacity

Answer 34

Amount of energy required to raise the temperature of 1kg of a substance by 1C

Question 35

Specific latent heat of vaporisation

Answer 35

Amount of heat required to convert a unit mass of liquid at its boiling point into a gas without an increase in temperature at a given pressure

Question 36

Triple point of water

Answer 36

Temperate and pressure at which water exists as liquid, solid and gas

Question 37

Vapour

Answer 37

Substance in the gas phase below its critical temperature

Question 38

Volt

Answer 38

PD between two points of a conducting wire when 1 joule of work is done to move 1 coulomb between two points of the conducting wire 1 volt will push a current of 1amp through a resistance of 1 ohm

Question 39

Weight

Answer 39

Gravitational force acting on an object Mass x gravitational acceleration (9.81ms-2)

Question 40

Critical temperature

Answer 40

Temperature above which a substance cannot be liquefied no matter how much pressure is applied

Question 41

Critical pressue

Answer 41

Pressure required to liquefy a gas at its critical temperature

Question 42

Pseudo critical temperature

Answer 42

Mixture of gases in which individual gases may separate out in to constituents

Question 43

Poynting effect

Answer 43

Gases dissolved with each other behave different than would be expected from their individual properties

Question 44

Fluid

Answer 44

Substance capable of changing its shape when acted on by an external force

Question 45

Density

Answer 45

Mass of a substance occupying a unit volume

Question 46

Viscosity

Answer 46

Fluid property that causes it to resist flow