WorksheetsL2 Scientific Principles Part 3
Total questions: 47
Worksheet time: 24mins
Metals that contain iron are know as?
Pure metals
Ferrous metals
Alloys
Non Ferrous metals
Brass is a mixture of?
Copper and Tin
Copper and Zinc
Copper, tin and Zinc
Iron and Carbon
Gunmetal is a mixture of?
Copper and Tin
Copper and Zinc
Copper, tin and Zinc
Iron and Carbon
Weight is the force of gravity pulling on a mass and is?
1 kg = 10N (9.81N)
10 kg = 10N (9.81N)
100 kg = 10N (9.81N)
0.1 kg = 10N (9.81N)
Weight is a force, it is measured in?
KG
Newtons
Grams
Pounds
To find the density of an object, use the following formula
density = mass / volume
volume = mass / density
density = mass + volume
density = mass - volume
Relative density is when we compare the mass of material. Water has a relative density of?
1
2
0.1
10
Relative density is when we compare the mass of material. Air has a relative density of?
1
2
0.1
10
Tensile strength: how strong is it when it is?
stretched or pulled
crushed
forces are opposing
How much can a material be pulled, pushed or stretched without breaking
Compression strength: how strong is it when it is?
stretched or pulled
crushed
forces are opposing
How much can a material be pulled, pushed or stretched without breaking
Shear strength: how strong is it when it is?
stretched or pulled
crushed
forces are opposing
How much can a material be pulled, pushed or stretched without breaking
Ductile strength: how strong is it when it is?
stretched or pulled
crushed
forces are opposing
How much can a material be pulled, pushed or stretched without breaking
Malleability is how much can a material be?
How much can a material be pulled, pushed or stretched without breaking
compressed without fracturing
This is the resistance of a material to bending, scratching, abrasion or cutting
All of the above
Hardness is how much can a material be?
How much can a material be pulled, pushed or stretched without breaking
compressed without fracturing
This is the resistance of a material to bending, scratching, abrasion or cutting
All of the above
Specific heat capacity is?
It is the amount of heat required to raise 1kg of a substance through 1 0C
It is the amount of heat required to raise 10kg of a substance through 1 0C
It is the amount of heat required to raise 1kg of a substance through 10 0C
It is the amount of heat required to raise 10kg of a substance through 10 0C
The specific heat capacity of water is?
1.486kj/kg
1.086kj/kg
0.996kj/kg
4.186kj/kg
Coefficient of linear expansion is?
How much energy is required to heat something up
How much does a piece of material expand by when heated
The amount and speed of the corrosion
How much can a material be pulled, pushed or stretched without breaking
Coefficient of linear expansion is calculated by?
Length in mm X Temp rise X Coefficient of the material
Length in mm X weight in KG X Coefficient of the material
Length in m X Temp rise X Coefficient of the material
Length in mm - Temp rise - Coefficient of the material
Water is at it's maximum density at what degree c?
0
1
4
100
The freezing point of what is how many Kelvin?
0
-10
273
4
When water freezes it expands by?
10%
4%
1600 times
100 times
When water boils it expands by?
10%
4%
1600 times
100 times
What issue will temporary hard water cause if heated above 65?
Pitting
Limescale
Plumboslvent
Cuprosolvent
What issue may soft water cause?
Pitting
Limescale
Plumboslvent
Cuprosolvent
The term used for water that is aggressive to copper is?
Pitting
Limescale
Plumboslvent
Cuprosolvent
When water can be drawn sideways or upwards between two close-fitting surfaces against gravity
Condensation
Capillary action
Evaporate
Plumboslvent
What is meant by the term Sensible heat?
The heat required to keep it boiling
The heat required to raise the water temperature to 100
Maximum density of water
Boiling point of water
The SI unit for flow rate is?
Litres per second/minute l/s or l/m
Metres per second M/s
Newtons N
Pascal (n/m2) Pa
The SI unit for pressure is?
Litres per second/minute l/s or l/m
Metres per second M/s
Newtons N
Pascal (n/m2) Pa
The rate at which an object changes its position, taking into account speed and direction (m/s) is?
Velocity
Acceleration
Flow rate
Force
The amount of fluid that flows through a pipe at a given time.
Velocity
Acceleration
Flow rate
Force
10 meters head is equal to?
0,1 bar
1 bar
10 bar
100 bar
At sea level, atmospheric pressure is
100 kpa
101.3 kpa
1 kpa
113 kpa
Siphonic action happens due to atmospheric pressure. Where do we use this within plumbing?
Soldering
WC cisterns
Heating
Showers
If a cylinder holds 100 litres of water, the water will weigh?
100 kg
10 kg
1000 kg
100 tons
Which of the following will affect the flow of water?
Pipe size
Construction of pipe
Changes in direction
All of the above
If a cold water cistern is 2 metres above the shower head, what pressure will be at that head?
2 bar
0.2 bar
0.02 bar
1 bar
The definition of Conduction is?
When heat travels through or along a material (one molecule to the next)
When molecules are heated, they heat and rise, and when they cool they fall
Heat transfer via infrared light. It transfers heat from one body to another without heating the space in between
The definition of Convection is?
When heat travels through or along a material (one molecule to the next)
When molecules are heated, they heat and rise, and when they cool they fall
Heat transfer via infrared light. It transfers heat from one body to another without heating the space in between
The definition of Radiated heat is?
When heat travels through or along a material (one molecule to the next)
When molecules are heated, they heat and rise, and when they cool they fall
Heat transfer via infrared light. It transfers heat from one body to another without heating the space in between
The building regulation that covers energy efficiency is?
L
A
H
G
Combustion is a chemical reaction with oxygen
Fuel + Oxygen + Heat = Fire
Fuel + Oxygen + Fire = Heat
Oxygen + Heat + Spark = Fire
Fuel + Oxygen = Fire
Calorific value of natural gas is?
38.5 mj/m3
95.0 mj/m3
121.5 mj/m3
50.1 mj/m3
A unit of power is known as a?
Watt
Current
Voltage
Resistance
The unit for electromotive force (emf).
Watt
Current
Voltage
Resistance
The type of electricity produced by a battery is?
AC
DC
Negative
Positive
The type of electricity produced by the mains is?
AC
DC
Positive
Negative
