A straight wire carries a current of 10 A.
Which one of the following diagrams best shows the magnetic field associated with this current?
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A straight wire carries a current of 10 A.
Which one of the following diagrams best shows the magnetic field associated with this current?
→ Using the right hand grip rule, the thumb points up and the fingers curl in an anticlockwise direction as seen from above.
In an experimental set-up used to investigate standing waves, a 6.0 m length of string is fixed at both ends, as shown in Figure 12. The string is under constant tension, ensuring that the speed of the wave pulses created is a constant 40 ms
In an initial experiment, a continuous transverse wave of frequency 7.5 Hz is generated along the string.
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a.
b. → A standing wave will not form.
→ A standing wave will form only if the wavelength of the wave is equal to an integer multiple
a.
b. → A standing wave will not form.
→ A standing wave will only form if the length of the string is equal to an integer multiple of
→ Since 6.0 m is not an integer multiple of
The graph below shows when the five major mass extinction events and several other mass extinction events occurred. It also shows the percentage of species that were lost in each event.
According to the graph, to be classified as a major mass extinction event, the percentage of species that are lost has to be at least
→ The lowest % of species lost in a mass extinction event is 74% within this data set.
→ It follows that for an extinction event to be classified as major, at least 74% of species must have been lost.
In a series of experiments, the rate of photosynthesis in plant cells was measured in environments with different concentrations of carbon dioxide. All other variables were kept constant.
Which one of the following graphs reflects the trend that would be shown by the results of these experiments?
→ As carbon dioxide is a reactant in photosynthesis, increasing the concentration will lead to a higher rate of photosynthesis initially.
→ This rate of increase will plateau and eventually stop as all the active sites of involved enzymes are being used.
→ If this relationship was graphed, the shape seen would most accurately resemble that in graph
A 3.1g sample of
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i.
ii. | ||
iii.
In the following reactions, predict whether entropy will increase or decrease, giving reasons. (3 marks)
i. → Decrease
→ 4 moles of gas becomes 2 moles of gas on the product side, causing the reaction to become more ordered and decreasing in entropy.
ii. → Increase
→ A solid decomposes into 2 moles of gas. This reaction becomes more disordered, and the phase change involves an increase in entropy.
iii. → Increase
→ An aqueous and solid reactant becomes an aqueous and gaseous product. The phase changes overall involve an increase in entropy.
i. → Decrease
→ 4 moles of gas becomes 2 moles of gas on the product side, causing the reaction to become more ordered and decreasing in entropy.
ii. → Increase
→ A solid decomposes into 2 moles of gas. This reaction becomes more disordered, and the phase change involves an increase in entropy.
iii. → Increase
→ An aqueous and solid reactant becomes an aqueous and gaseous product. The phase changes overall involve an increase in entropy.
Find the oxidation state of each element in the compound
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The oxidation state of phosphorus in the pyrophosphate ion
Which one of the following will not increase the rate of the above reaction?
In the above reaction, the number of successful collisions per second is a small fraction of the total number of collisions.
The major reason for this is that
→ Options
→ Successful collisions occur only if the particles involved have at least the minimum kinetic energy required and the correct orientation.
A helium balloon is inflated to a volume of 5.65 L and a pressure of 10.2 atm at a temperature of 25°C.
Calculate the amount of helium, in moles, in the balloon. (2 marks)
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A home owner on a large property creates a backyard entertainment area. The entertainment area has a low-voltage lighting system. To operate correctly, the lighting system requires a voltage of 12
Calculate the power drawn by the lighting system. (3 mark)
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→ Using
→ The power drawn from the lighting system is 12
Figure 2 shows two equal positive stationary point charges placed near each other.
Sketch on Figure 2 the shape and direction of the electric field lines. Use at least eight field lines. (2 marks)
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→ Field lines must not touch.
→ Fields will repel one another.
An aerosol can with a volume of 300.0 mL contains 2.80 g of propane gas as a propellant. The warning label says the aerosol may explode at temperatures above 60.0 °C.
What is the pressure in the can at a temperature of 60.0 °C? (2 marks)
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When concentrated sulfuric acid is added to dry sucrose,
An equation for the reaction is
Calculate the mass of carbon residue that could be produced by the reaction of 50.0 g of sucrose with excess concentrated sulfuric acid. (2 marks)
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The electric field between two parallel plates that are 1.0 × 10
Calculate the voltage between the plates? (2 marks)
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A 0.8 m long guitar string is set vibrating at a frequency of 250 Hz. The standing wave envelope created in the guitar string is shown in Figure 12.
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a.
b.
a. |
||
b.
Two blocks of mass 5 kg and 10 kg are placed in contact on a frictionless horizontal surface, as shown in the diagram below. A constant horizontal force,
Which one of the following statements is correct?
If the force
Using Newton’s second Law:
→ The blocks will experience the same acceleration.
→ Both blocks will have the same force to mass ratio. Since the 5 kg block is half the mass of the 10 kg block, it will experience half the magnitude of the net force as the 10 kg block.
A distant fire truck travelling at 20 ms
Chris is standing on the edge of the road. Assume that the fire truck is travelling directly towards him as it approaches and directly away from him as it goes past. The arrangement is shown in Figure 14.
a.
a.
A small sodium lamp, emitting light of wavelength 589 nm, is viewed at night through two windows from across a street. The glass of one window has a fine steel mesh covering it and the other window is open, as shown in Figure 18. Assume that the sodium lamp is a point source at a distance.
A Physics student is surprised to see a pattern formed by the light passing through the steel mesh but no pattern for the light passing through the open window. She takes a photograph of the observed pattern to show her teacher, who assures her that it is a diffraction pattern.
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a. Condition to satisfy:
→ The size of the gaps from the fine steel mesh must be of the same order of magnitude of the wavelengths of the light from the sodium lamp.
b. Open window differences:
→ The width of the window is significantly greater than wavelength of the light from the sodium lamp and the width of the glass molecules that make up the glass window is significantly smaller than the light from the sodium lamp.
→ These widths contrast greatly to the size of the steel mesh and are not of the same order of magnitude of the light from the sodium lamp, hence no diffraction will occur.
a. Condition to satisfy:
→ The size of the gaps from the fine steel mesh must be of the same order of magnitude of the wavelengths of the light from the sodium lamp.
b. Open window differences:
→ The width of the window is significantly greater than wavelength of the light from the sodium lamp and the width of the glass molecules that make up the glass window is significantly smaller than the light from the sodium lamp.
→ These widths contrast greatly to the size of the steel mesh and are not of the same order of magnitude of the light from the sodium lamp, hence no diffraction will occur.
Kym and Kelly are experimenting with trolleys on a ramp inclined at 25°, as shown in Figure 7. They release a trolley with a mass of 2.0 kg from the top of the ramp. The trolley moves down the ramp, through two light gates and onto a horizontal, frictionless surface. Kym and Kelly calculate the acceleration of the trolley to be 3.2 m s
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a.i. See Worked Solutions
a.ii.
b.i.
b.ii. For the collision to be elastic, the kinetic energy must be conserved.
→ As the kinetic energy of the system decreases after the collision, it is not an elastic collision.
a.i. The gravitational force down the slope:
a.ii. | ||
b.i. By the conservation of momentum:
b.ii. For the collision to be elastic, the kinetic energy must be conserved.
→ As the kinetic energy of the system decreases after the collision, it is not an elastic collision.
Which one of the following statements best describes transverse and longitudinal waves?
→ The energy transfer through transverse waves is perpendicular to the direction of vibrations.
→ The energy transfer through longitudinal waves is parallel to the direction of vibrations.
Which one of the following statements best describes an observation of the Doppler effect for sound?
→ As a result of the Doppler effect, when there is relative movement towards a source of sound waves the frequency of the observed sound waves is increased.
A railway truck
After the collision, they are joined together and move off at speed
Which one of the following is closest to the mass of railway truck
Which one of the following best describes the force exerted by the railway truck
→ By the law of conservation of momentum, the momentum before the collision is equal to the momentum after the collision.
→ By Newton’s 3rd law of motion, each action has an equal and opposite reaction.
→ Hence, the force of
Victoria’s fossil emblem Koolasuchus cleelandi, shown on the stamp above, was chosen in January 2022.
K. cleelandi fossils have been found in Boonwurrung country in Gippsland. Studies of K. cleelandi fossils have revealed many interesting findings. Several of these findings are summarised below.
K. cleelandi findings
Part 1
Which combination of findings from the list above is most likely to be associated with an increased chance of formation of K. cleelandi fossils?
Part 2
It is most likely that scientists determined the absolute age of K. cleelandi fossils
→ K. cleelandi has large, dense bones (finding 2) which are less likely to decay overtime and hence have a higher chnace of being fossilised for a long period of time.
→ Because these bones are remaining in a river carrying many sediments (finding 4) the bones are more likely to be fossilised as they are covered quicker, reducing disturbance and hiding them from scavnegers.
→ Radioisotope dating of rocks is extremely accurate and reliable source of dating. Therefore it ios likely that scientists dated K. cleelandi fossils by dating the surrounding rock.
Enzymes are associated with the biochemical pathways of cellular respiration and photosynthesis.
Consider a cell that carries out both cellular respiration and photosynthesis.
Which one of the following is a correct statement about the enzymes associated with these pathways?
By Elimination
→ While the net chemical equations for photosynthesis and cellular respiration appear to be the reverse of each other, each reaction is made up of various processes which require different reaction conditions, including different enzymes (Eliminate A).
→ Enzyme concentrations can increase/decrease the amount of available active sites which can change the rate of reaction rate (Eliminate C).
→ A large increase in temperature would not increase reaction rate but would denature the enzymes (Eliminate D).
→ Changes in various factors, including pH, can denature an enzyme if the change is outside the optimal range for that factor.
The decomposition of ammonia is represented by the following equation.
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a.
b. → Tungsten will cause ammonia to decompose faster.
→ Faster rate due to lower activation energy.
→ Lower activation energy results in a greater proportion of successful collisions.
a.
b. → Tungsten will cause ammonia to decompose faster.
→ Faster rate due to lower activation energy.
→ Lower activation energy results in a greater proportion of successful collisions.
The energy profile diagram below represents a particular reaction. One graph represents the uncatalysed reaction and
the other graph represents the catalysed reaction.
Which of the following best matches the energy profile diagram?
A. | ||
B. | ||
C. | ||
D. |
→ The
→ The
The following energy profile shows the results obtained during an enzyme-catalysed reaction. Each stage of the reaction is labelled: M represents the initial reactants, N represents a stable intermediate and P represents the final products.
Which one of the following statements is correct?
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a. Answers could include one of the following:
→ Heat loss into the surroundings from combustion process.
→ Specific examples of heat loss such as inefficient heating of water caused by proximity of the heat or not using a beaker lid.
b.
a. Answers could include one of the following:
→ Heat loss into the surroundings from combustion process.
→ Specific examples of heat loss such as inefficient heating of water caused by proximity of the heat or not using a beaker lid.
b.
Which statement explains why catalysts are often used in chemical reactions?
→ Catalysts increase the rate of reactions.
Hydrogen peroxide,
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a. → Increasing the temperature will increase the rate of
→ An increase in temperature increases the kinetic energy of all molecules which causes both the frequency of collisions and the energy of each collision to increase.
→ The temperature increase results in more collisions, of which a higher proportion are successful (i.e. occur with greater energy than the activation energy threshold required to react).
b.
a. → Increasing the temperature will increase the rate of
→ An increase in temperature increases the kinetic energy of all molecules which causes both the frequency of collisions and the energy of each collision to increase.
→ The temperature increase results in more collisions, of which a higher proportion are successful (i.e. occur with greater energy than the activation energy threshold required to react).
b.
The correct equation for the incomplete combustion of ethanol is
→ The products of incomplete combustion are
Methane gas,
Write the balanced equation for the complete combustion of
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Bioethanol,
The mass of
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a. Timing of a falling mass.
→ Set up an electronic and automatic timing system with sensors to detect the presence of a small falling metal ball.
→ Heights for the ball should be set up between 0.2 m to 1 m with intervals every 0.2 m. To increase the reliability of the results, multiple trials should be conducted at each height and the average falling time for each height should be calculated which can then be used to graph the data.
→ The results should be plotted on a graph of height vs time
→ After plotting the data, the acceleration due to gravity,
b. → Look up known value on a reliable website (e.g. National Measurement Institute).
→ Ensure the value is for the location of the experiment (it can differ slightly).
→ Compare the known value to the value determined experimentally and the closer they are, the greater the accuracy of the experiment.
c. → Conduct multiple trials at each height.
→ Use the average of the calculations as stated in the method above.
d. → Compare the values obtained at a single height.
→ If there is a large variation in the calculations conducted at the same height, the data collected is less reliable.
a. Timing of a falling mass.
→ Set up an electronic and automatic timing system with sensors to detect the presence of a small falling metal ball.
→ Heights for the ball should be set up between 0.2 m to 1 m with intervals every 0.2 m. To increase the reliability of the results, multiple trials should be conducted at each height and the average falling time for each height should be calculated which can then be used to graph the data.
→ The results should be plotted on a graph of height vs time
→ After plotting the data, the acceleration due to gravity,
b. → Look up known value on a reliable website (e.g. National Measurement Institute).
→ Ensure the value is for the location of the experiment (it can differ slightly).
→ Compare the known value to the value determined experimentally and the closer they are, the greater the accuracy of the experiment.
c. → Conduct multiple trials at each height.
→ Use the average of the calculations as stated in the method above.
d. → Compare the values obtained at a single height.
→ If there is a large variation in the calculations conducted at the same height, the data collected is less reliable.
The diagram represents the electric field around a negative charge.
If the magnitude of the charge were doubled, which diagram would best represent the new electric field?
→ The density of the field lines corresponds to the strength of the electric field surrounding the point charge.
→ Hence a stronger charge produces a stronger field and so the field lines become denser.
The industrial production of ammonia is represented by the Haber process reaction shown.
Factors such as temperature and pressure need to be considered in order to maximise yield.
Which of the following is correct?
→ Increasing the pressure would shift the position of equilibrium to the side of the equation with less moles (as per Le Chatelier’s principle).
→ This would increase the yield of
Sodium chloride dissolves in water according to the following equation.
A saturated solution of
The structural formula of a compound is given.
What is the preferred IUPAC name of this compound?
→ The organic molecule has a 5-Carbon backbone, therefore the prefix will be “Pent”
→ The molecule contains no branches, so the rest of its name will be defined by the triple carbon bond “yne”
→ The rules of nomenclature state that the name must assign the triple carbon bond the lowest carbon number, this is achieved by numbering the carbons from right to left, placing the triple carbon bond at carbon 2
→ Hence the name of the compound is “Pent-2-yne”
Students performed an investigation to determine the initial velocity of a projectile.
Which row correctly identifies a hazard of this investigation and a related precaution?
Hazard | Safety precaution | |
A. | flying projectile | wearing safety glasses |
B. | range of projectile | measuring the range with a tape measure |
C. | enclosed shoes | limiting the range of the projectile |
D. | safety glasses | flying projectile |
→ A hazard is a danger and the only danger in the answer options is the flying projectile.
→ Wearing safety glasses will protect students eyes from being hit from the projectile.
A part of a cathode ray oscilloscope was represented on a website as shown.
Electrons leave the cathode and are accelerated towards the anode.
Calculate the force on an electron due to the electric field between the cathode and the anode. (2 marks)
Using
Why does the electrical resistance of a metal increase as temperature increases?
→ As the temperature of a metal increases, the average kinetic energy of the atoms in the lattice that make up the metal increases.
→ This causes the lattice to vibrate.
→ The vibrating lattice then interferes with the flow of electrons through the metal leading to a greater electrical resistance.
A laser emits light of wavelength 550 nm. (
Calculate the frequency of this light. (2 marks)
Consider the following statement about real numbers.
"Whichever positive number
When this statement is written in the formal language of proof, which of the following is obtained?
→ The electric field lines are defined by the direction of force on a positive charge.
→ A positive charge will experience a repulsive force from the positive plate and attractive force to the negative plate.
Some isomers with the formula
Name ONE pair of functional group isomers and ONE pair of chain isomers from the structures above. (2 marks)
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Functional Group: Butan-2-one and butanal
Chain: Butanal and 2-methylpropanal
Functional Group: Butan-2-one and butanal
Chain: Butanal and 2-methylpropanal
An ideal transformer is connected to a 240 V AC supply. It has 300 turns on the primary coil and 50 turns on the secondary coil.
It is connected in the circuit with two identical light globes,
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a. 40 V
b. Closed switch
→ Once the switch is closed, the total resistance through the circuit is less than when only light globe
→ Since
→ Transformer is ideal, so Power in = Power out (
→ Therefore, the current in the primary coil is greater when the switch is closed.
a. | |||
→ The voltage across light globe
b. Closed switch
→ Once the switch is closed, the total resistance through the circuit is less than when only light globe
→ Since
→ Transformer is ideal, so Power in = Power out (
→ Therefore, the current in the primary coil is greater when the switch is closed.
The diagram represents one type of electric motor.
Describe the function of part
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→ Part
→ This ensures that unidirectional torque is maintained in the DC motor so that it continues to rotate in the same direction.
→ Part
→ This ensures that unidirectional torque is maintained in the DC motor so that it continues to rotate in the same direction.
The James Webb Space Telescope observed an exoplanet emitting a peak wavelength of 1.14
Calculate the temperature of the exoplanet. (2 marks)
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The James Webb Space Telescope (JWST) has a mass of 6.1 × 10³ kg and orbits the Sun at a distance of approximately 1.52 × 10
The Sun has a mass of 1.99 × 10
Calculate the magnitude of gravitational force the Sun exerts on the JWST. (2 marks)
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A spacecraft passes Earth at a speed of 0.9
What is the time between the pulses, as measured by an observer on Earth? (3 marks)
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A Hertzsprung–Russell diagram is shown.
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a. The luminosity of a star can be determined by its size and temperature.
Other variables could include:
→ Mass, colour and the power output of a star.
b. Differences:
→ Star A is a main sequence star and is therefore fusing hydrogen to helium in its core via both the proton-proton chain and CNO cycle whereas Star B is a white dwarf star and therefore has no fusion taking place in its core.
→ Star A has a greater luminosity compared to Star B.
→ Star A is a younger star then Star B which is at the end of its lifecycle.
Other differences could include:
→ Mass
→ Radius or size
a. The luminosity of a star can be determined by its size and temperature.
Other variables could include:
→ Mass, colour and the power output of a star.
b. Differences between stars:
→ Star A is a main sequence star and is therefore fusing hydrogen to helium in its core via both the proton-proton chain and CNO cycle whereas Star B is a white dwarf star and therefore has no fusion taking place in its core.
→ Star A has a greater luminosity compared to Star B.
→ Star A is a younger star then Star B which is at the end of its lifecycle.
Other differences could include:
→ Mass
→ Radius or size
The chart shows part of a nuclear decay series beginning with uranium.
Which option correctly identifies
→ During the decay process producing
→ Alpha decay producing
→ During the decay process producing
→ Beta decay producing
Minamata Disease is caused by regular consumption of contaminated fish and shellfish. The symptoms include numbness in the hands and feet, muscle weakness, and damage to vision, hearing and speech.
Pellagra is a disease which causes delusions or mental confusion, diarrhoea, weakness and loss of appetite caused by insufficient levels of iron and niacin.
Wildervanck Syndrome is a condition that affects the bones in the neck, the eyes and the ears, and occurs primarily in females.
Given the information above, which row in the table correctly identifies the classification of these diseases?
Minamata Disease | Pellagra | Wildervanck Syndrome | |
A. | Genetic | Nutritional | Environmental |
B. | Genetic | Environmental | Nutritional |
C. | Environmental | Genetic | Nutritional |
D. | Environmental | Nutritional | Genetic |
By Elimination:
→ Minamata is caused by consumption of contaminated seafood and is therefore environmental, not genetic (Eliminate A and B).
→ Pellagra is caused by insufficient iron and niacin levels, which are a mineral and a vitamin respectively. It is therefore a nutritional disease and not genetic (Eliminate C).
→ As Wildervanck Syndrome occurs primarily in females, there cannot be 100% certainty it is genetic. However, with all other options eliminated, it can be assumed to be the case here.
An experiment was conducted to investigate the rate of binary fission in E.coli. The results of the experiment are shown.
Time (minutes) | Number of E.coli |
0 | 20 |
20 | 40 |
40 | 80 |
60 | 160 |
80 | 320 |
100 | 640 |
Which graph represents the data in the table?
By Elimination:
→ The independent variable (time) must be on the
→ The number of E. Coli starts at 20, not 0 (Eliminate A).
A Punnett square is shown.
Which of the following options represents heterozygous offspring?
→ A heterozygous genotype is given by Bb, where-as a homozygous genotype is given by BB or bb.
→ Only options 2 and 4 show this.
Which of the following is an advantage of internal fertilisation?
→ Internal fertilisation occurs in a moist environment, decreasing the risk of gamete dehydration.