Mock Questions I Got Wrong

Question 1

Give the names of waves in the electromagnetic spectrum (rmivuxg)

Answer 1

Radio waves,microwaves,infrared waves,ultraviolet ,X-rays,gamma rays

Question 2

Give the uses of gamma,infrared and radio waves (3)

Answer 2

Gamma-sterilize surgical equipment
Infrared-night vision devices
Radio-bluetooth

Question 3

What’s the range of wavelengths in the electromagnetic spectrum (1)

Answer 3

10-15 to 10’4 m

Question 4

Explain an advantage of using biodiesel rather than crude oil(2)

Answer 4

Biodiesel is carbon neutral so it doesn’t add extra co2 into the atomosphere therefore it doesn’t contribute to global warming

Question 5

Suggest two reasons why distance that a van travels using biodiesel can vary (2)

Answer 5

The speed of the van and if the AC is turned on or off

Question 6

Describe how to measure the spring constant (6)

Answer 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.

Question 7

How do you calculate distance from a speed time graph

Answer 7

Find the area below it

Question 8

What’s the unit of acceleration

Answer 8

M/s ‘2

Question 9

Give one advantage of using an led instead of a filament lamp

Answer 9

Led wont overheat whereas filament lamps will

Question 10

Explain how potential difference changes in resistors as the,premature of thermistor increase (4)

Answer 10

total resistance of the circuit
decreases
current in the circuit
increases
resistance of resistor is
constant
V = IR therefore potential
difference across resistor
increases

Question 11

Compare the current in thermistors in series and parallel circuits (3)

Answer 11

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

Question 12

Explain how crash barriers can reduce injuries to the passengers on a train. Include ideas about momentum in your answer (4)

Answer 12

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

Question 13

Give 2 advantages of using switch mode transformers rather than basic transformers in phones (2)

Answer 13

More portable and no load is applied when screen is switched off

Question 14

An alternating pd across the coil in wireless charging pad creates an ac inside the mobile phone,explain why (3)

Answer 14

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)

Question 15

Plan an investigation to find the time it took hot water in the cups to cool to 60 degrees

Answer 15

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

Question 16

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 _________

Answer 16

Evaporation,convection

Question 17

Describe 2 differences and 2 similarities between the properties of electromagnetic waves and sound waves

Answer 17

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

Question 18

Give 2 uses of ultrasound waves

Answer 18

Prenatal scanning and removing kidney stones

Question 19

Describe how optical fibers are used to enable images inside an engine to be produced (3)

Answer 19

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

Question 20

Explain how the eye changes to allow light from a distant object to focus on the retina

Answer 20

ciliary muscle relaxes
makes lens thinner
so focal length increases

Question 21

What’s used to correct long sightedness

Answer 21

Converging lenses since they allow light to meet at the retina

Question 22

Give one advantage of a computer fan that has adjustable speed (2)

Answer 22

the fan can run more slowly
(when less cooling is
required)
so
any one from:
• less power / energy
transferred
• quieter
• last longer

Question 23

Explain why a diver with a different masses would take the same time to fall 10m (2)

Answer 23

distance is small so air
resistance can be ignored
so both have the same
acceleration