Convection is the main form of heat transfer in...............?
Solids
Liquids
Gases
The bigger smaller( bigger, smaller ) the temperature difference, the faster the heat transfer.
Which of these surfaces are good at absorbing & emitting IR radiation?
Dark
Matt
Light
Shiny
Conduction is faster in denser solids because the particles are closer together and will collide more often.
Why are metals good conductors?
Because they have free electrons
Because their particles are closer together
Because their particles move faster
Why does water become less dense when it is heated?
Because the particles gain heat energy and spread apart
The heat makes the particles lighter
Because the particles lose heat energy and spread apart
The fastest particles are most likely to evaporate, the average speed of the remaining particles.
The rate of condensation will be faster if.........
Temperature of gas is lower
Temperature of gas is higher
Density is higher
Density is lower
Airflow is less
Airflow is greater
The larger the surface area, the faster slower( faster, slower ) the heat transfer.
Why are the walls of a vacuum flask silvered?
To reduce heat loss by radiation
To reduce heat loss by conduction
To reduce heat loss by convection
How do you work out payback time?
Initial cost / Annual saving
Annual saving / Initial cost
The better the insulator, the lower higher( lower, higher ) the U-value.
What are the units for Specific Heat Capacity?
J/kg°C
J/kg
J/°C
Conservation of Energy Principle: Energy can be transferred, stored or dissipated but it can never be or destroyed.
Energy is most often lost as......
Heat
Sound
Kinetic
What are the standard units for electrical energy?
kWh
Joules
Watts
What effect can access to electricity have on standard of living?
Public health
Communications
Malnutrition
Which of these represents the energy transfer when burning a fossil fuel to generate electricity?
Chemical ---> Heat ---> Kinetic ---> Electrical
Heat ---> Kinetic ---> Chemical ---> Electrical
Chemical ---> Kinetic ---> Heat ---> Electrical
Which of these renewable energy sources cause permanent damage to the landscape?
Wind power
Solar power
Hydroelectric power
Tidal power
Which of these is the main advantage of HEP?
Can store energy
Little environmental impact
Low start up costs
Wave power can be harnessed by using the up and down side to side up( up and down, side to side, up ) motion of the waves to drive a generator.
Which of these is a major disadvantage of geothermal energy?
It can only be done in a few locations
It is difficult to use the energy
It produces a lot of polluting gases
Which of these power stations takes the least amount of time to set up?
Natural gas
Oil
Coal
Nuclear
How do biofuels harm the environment?
They are 'carbon neutral'
They require clearance of large areas of forest
They release a lot of methane when the plants grow
Where is captured carbon dioxide pumped to in CCS?
Empty gas & oil fields
The ocean
The atmosphere
What is the National Grid?
A system of cables and pylons
A system of cables and transformers
A system of cables, transformers and power stations
How can our demand for electricity be reduced?
Consumers using more energy-efficient appliances
Being more careful not to waste energy in the home
Opening more power plants
Frequency is the number of waves produced in one .
Sound waves are an example of a transverse wave.
Angle of incidence angle of reflection.
Which of these describe the image in a plane mirror?
Same size as object
Bigger than object
Virtual
Real
Upright
Upside down
Laterally inverted
In diffraction, the narrower the gap, the more less( more, less ) the wave spreads out.
What happens when a wave travels along the normal?
It will change speed but not be refracted
It will change speed and be refracted
What is the approximate range of wavelengths of electromagnetic waves?
10^−15 metres to 10^4 metres
10^−4 metres to 10^15 metres
10^−6 metres to 10^6 metres
How are long-wave radio waves (1-10 km) transmitted?
They diffract around the curved surface of the Earth
They are reflected from the ionosphere
The higher the frequency of a wave, the the wavelength.
Which of these are uses of Infrared waves?
Satellite communication
Mobile phones
Remote controls
Optical fibres
Photography
The bigger the amplitude, the the sound.
When we look at light from distant galaxies we see the same patterns but at slightly lower higher( lower, higher ) frequencies
The further away a galaxy is, the greater the red-shift.
Which of these describes the Big Bang theory?
All matter & energy compressed into small space which exploded & is still expanding.
Universe has always existed as it is now - expansion can be explained by matter being created.
