Multiple Choice Flashcards
A man freewheels his bike down a hill. He brakes to stop at the bottom. What is the energy change?
Gravitational ➡️ Kinetic ➡️ Thermal
What is measured to determine atmospheric pressure in the experiment with a Petri dish of water with test tube coming out of it?
Distance between the 2 water levels
Where is the greatest temperature change when light is refracted through a prism?
Above red because it is infra-red. This is because it has the longest wavelength.
When does total internal reflection happen?
When angle of incidence is greater than the critical angle
What is heated to produce cathode rays?
The cathode
Geothermal energy from hot rocks and sunlight on solar panels are…
Renewable sources of energy
Nuclear fission is…
A non-renewable source of energy
If one liquid takes less time to heat than another liquid it has…
A lower thermal capacity
What remains constant when light is refracted?
Frequency
What changes when light is refracted?
Wavelength, speed and direction
Where do you measure from on the meniscus (water level)?
Bottom of the meniscus
Conduction only happens in…
Solids
In longitudinal waves the particles oscillate…
parallel to the wave direction
In transverse wave the particles oscillate…
Perpendicularly to the wave direction
What sort of wires have the most resistance?
Long and thin wires have the most resistance
What happens to LDR’s when brightness increases?
When brighter, resistance is less
What does the magnetic field in a solenoid look like?
Straight lines through solenoid. These lines curl round and attach to make oval shapes above and below solenoid.
Frequency equation
F=1/T
What wave type are radio waves?
Transverse
These 2 energy sources are always available
Geothermal, nuclear fission
Where does a fuse have to be to cut the whole circuit?
In series, on the live side of the circuit and after the switch
What sort of waves are emitted by satellite television?
Microwaves
What sort of waves are emitted by terrestrial TV?
Radio waves
What sort of waves are emitted by a remote control?
Infra-red waves
Radiation ordered by most ionising/least penetrative
Most : Alpha
Beta
Least: Gamma
What sort of circuit is a capacitor used in?
Time-delay circuit
What sort of circuit is a relay used in?
Switching circuit
Nuclear energy (from nuclear fission) is first converted into…
Thermal energy
What happens to the proton number when a beta particle (1 electron) is emitted?
The proton number increases by 1
What wave type are radio waves?
Transverse
How can diffraction be stopped?
Make the gap larger
Why do smoke particles move in the brownian experiment?
Collide with air particles
How is a manometer used?
Measure gap between the 2 liquid levels
What effect does changing the temperature of a y-ray source have?
No effect
What material should the core of a transformer be?
Iron
How to work out the magnetic field on a wire?
Right hand grip rule
What is the pressure of a gas supply in a manometer?
Distance between water +/- atmospheric pressure
What’s a suitable voltage and current for a cathode ray?
600v dc
Formula for a transformer?
Vp/Cp = Vs/Cs
Can you hear noise in space?
No
What effect does gravity have on a ball being thrown upwards?
Constant acceleration downwards
What effect does changing the temperature of a y-ray source have?
Temperature has no effect
What material should the core of a transformer be?
Iron
How do you work out the magnetic field of a wire?
Right hand grip rule
What is the pressure of a gas supply in a manometer?
Distance between water levels +/- atmospheric pressure
Alpha has a ….. ionising effect than beta.
Alpha has a ….. penetrating effect than beta.
Alpha is more ionising than beta
Alpha is less penetrating than beta
In a step-down transformer the biggest coil is the …..
Primary coil
In a step-up transformer the bigger coil is the….
Secondary
What can stop a circuit overheating?
Circuit-breaker or fuse
What does a capacitor do?
Stores charge
Image through a lens is always….
Inverted
Where is the best place to put ice packs?
At the top of bag of food
What is the energy of compressing springs called?
Strain
How should electricity be transmitted?
High voltage, ac current
Name 3 transverse waves?
Light waves, infra-red waves and ultraviolet waves
What type of energy is stored in both matches and batteries?
Chemical
Increasing deflection of radiation
Increase potential difference across plates
When does a capacitor charge?
When connected to a battery. The capacitor discharges when connected to the circuit with no battery supply
Electromagnetic spectrum in order of increasing wavelength
Gamma, X-Rays, UV, Visible, Infra-red, microwaves, radiowaves
Electromagnetic waves in order of increasing frequency
Visible, X-rays, y-rays
What happens when a magnet moves through an ac solenoid?
Demagnetises
