Mock Questions I Got Wrong Flashcards
Give the names of waves in the electromagnetic spectrum (rmivuxg)
Radio waves,microwaves,infrared waves,ultraviolet ,X-rays,gamma rays
Give the uses of gamma,infrared and radio waves (3)
Gamma-sterilize surgical equipment
Infrared-night vision devices
Radio-bluetooth
What’s the range of wavelengths in the electromagnetic spectrum (1)
10-15 to 10’4 m
Explain an advantage of using biodiesel rather than crude oil(2)
Biodiesel is carbon neutral so it doesn’t add extra co2 into the atomosphere therefore it doesn’t contribute to global warming
Suggest two reasons why distance that a van travels using biodiesel can vary (2)
The speed of the van and if the AC is turned on or off
Describe how to measure the spring constant (6)
hang the spring from the retort stand
• measure the original length of the spring with a metre
rule
• attach a pointer to the end of the spring
• add 100 g mass to the spring
• measure the length of the spring
• repeat for different masses
• calculate the extension of the spring
• length of spring – original length
• or use a pointer and start with pointer at zero on the ruler
to measure extension directly
• calculate the force applied to the spring
• use w = mg
Some of the indicative content may be gained by a
correctly labelled diagram.
How do you calculate distance from a speed time graph
Find the area below it
What’s the unit of acceleration
M/s ‘2
Give one advantage of using an led instead of a filament lamp
Led wont overheat whereas filament lamps will
Explain how potential difference changes in resistors as the,premature of thermistor increase (4)
total resistance of the circuit
decreases
current in the circuit
increases
resistance of resistor is
constant
V = IR therefore potential
difference across resistor
increases
Compare the current in thermistors in series and parallel circuits (3)
potential difference across
the thermistor connected in
parallel is higher
resistance of the thermistor
is the same in each circuit
therefore, the current is
higher in the thermistor
connected in parallel
Explain how crash barriers can reduce injuries to the passengers on a train. Include ideas about momentum in your answer (4)
the foam compresses
time taken for train to stop
increases (compared to
hitting the wall)
therefore, rate of change of
momentum decreases
therefore, reduces force on
passengers
Give 2 advantages of using switch mode transformers rather than basic transformers in phones (2)
More portable and no load is applied when screen is switched off
An alternating pd across the coil in wireless charging pad creates an ac inside the mobile phone,explain why (3)
there is an alternating
current in the coil in the
charging pad
causes an alternating
magnetic field across the
coil in the mobile phone
which induces an alternating
potential difference across
the coil in the mobile phone
(which creates an
alternating current)
Plan an investigation to find the time it took hot water in the cups to cool to 60 degrees
Measure initial water temperature and make sure they all have the same starting temperature,boil hot water with kettle and make sure all cups are the same size.use beaker to put same amt of hot water in each cup then leave ups in the same room then measure the final temperature using the thermometer and record time every ten secs using the stopwatch tilll it reaches 60 degrees
The most energetic particles leave the surface of drinks by a process called _______ hotter liquid rises from the bottom of the cup by a process called _________
Evaporation,convection
Describe 2 differences and 2 similarities between the properties of electromagnetic waves and sound waves
Differences: sound is longitudinal while electromagnetic is transverse,sound waves recuire a medium to travel through while electromagnetic waves don’t,em waves travel faster than sound
Similarities- they both transfer energy not matter,some em waves are also used for communication
Give 2 uses of ultrasound waves
Prenatal scanning and removing kidney stones
Describe how optical fibers are used to enable images inside an engine to be produced (3)
light is reflected off the
inside of the engine
the image / light /
information / is transferred
to the phone through the
fibre optic cable by
total internal reflection
Explain how the eye changes to allow light from a distant object to focus on the retina
ciliary muscle relaxes
makes lens thinner
so focal length increases
What’s used to correct long sightedness
Converging lenses since they allow light to meet at the retina
Give one advantage of a computer fan that has adjustable speed (2)
the fan can run more slowly
(when less cooling is
required)
so
any one from:
• less power / energy
transferred
• quieter
• last longer
Explain why a diver with a different masses would take the same time to fall 10m (2)
distance is small so air
resistance can be ignored
so both have the same
acceleration
