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Mock Exam C (1): BMAT Section 2

27 Questions, 30 Minutes

​Question 1
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A detergent is a substance that allows oil and water to mix, commonly used for cleaning.
Which row of the table below correctly identifies the bond nature of the molecule?

Correct Answer: C 
Ionic head which can dissolve in water (hydrophilic), and covalent (hydrophobic) tale which can dissolve in oil.

 
Question 2
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Evaluate the following:
 
Correct Ansswer: A
The candidate must be able to expand the brackets and add the terms to form the expression listed. Surd rules should be used appropriately. This is specific knowledge listed in the Subject Guide.


​Question 3
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Which of the following statements are true?
 
  1. Genes contain chromosomes, and they code for proteins
  2. Alleles are different forms of the same gene
  3. In gametes, chromosomes are found in pairs
  4. DNA is a triple helix made from 4 different nucleotides
 
A. All are correct
B. 2,3
C. 1,3,4
D. 2 only
E. 3 only
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Correct Answer: D
1 can be eliminated using knowledge that chromosomes contain genes, not the other way around. The second clause of 1 is correct though. 3 can be eliminated using knowledge that gametes are haploid, not diploid. 4 can be eliminated using knowledge that DNA is a double helix made from 4 different nucleotides.


Question 4
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A motor of input power 150W raises a mass of 10.0 kg vertically a distance of 6m in 12s. What is the efficiency of the system?

Correct Answer: B


Question 5
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Which of the following correctly identifies the products of respiration?

A. Carbon dioxide and water in aerobic respiration, and lactic acid in anaerobic respiration
B. Lactic acid in aerobic respiration, and carbon dioxide in anaerobic respiration
C. Oxygen and water in aerobic respiration, and lactic acid and water in anaerobic respiration
D. Carbon dioxide and oxygen in aerobic respiration, and lactic acid in anaerobic respiration
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Correct Answer: A
This is specific knowledge listed in the Subject Guide. Anaerobic respiration produces lactic acid as there is no enough oxygen present to fully oxidise the reactants. 


Question 6
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Correct Answer: A
The area must be divided by the length of the side in order to find the length of the other side. This is explained by area being the product of 2 dimensions. Using power rules appropriately gives the value listed.

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Question 7
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Which of the following statements about butene are correct?
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  1. It can be used as monomer to form an addition polymer.
  2. There are three possible positions for carbon-carbon double bond in it.
  3. It can be reduced to form butane.
  4. It is an unsaturated hydrocarbon.
  5. It can react with chlorine only in the presence of light.

A. 1, 2 and 3 only
B. 1, 2 and 5 only
C. 1, 3 and 4 only
D. 1, 3 and 5 only
E. 2, 3 and 5 only
F. 2, 3 and 4 only
G. 2, 4 and 5 only
H. 3, 4 and 5 only
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Correct Answer: C
The candidate must be able to apply knowledge of alkenes, showing 1,3, and 4 are correct. 2 is incorrect since there are two possible positions for carbon-carbon double bond in it. i.e., but-1-ene and but-2-ene. 5 is incorrect since the carbon-carbon double bond can react with chlorine in absence of light.

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Question 8
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Movement across membranes has many applications in biology. The following examples are three of them. Match these examples to the correct process of diffusion, osmosis, or active transport.
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This is called Na+-K+ ATPase that pumps sodium out of cells and potassium into cells against their concentration.
​This is a biological phenomenon: when normal red blood cells are placed in a hypotonic solution -has a low concentration of solute-, they burst because of the water movement into them.
This is called ATP synthase that provides energy for the cell by producing ATP through allowing hydrogen ions to flow back across the membrane from the high H+ concentration to the low H+ concentration space without using any source of energy.
A. Na+-K+ ATPase is an application of osmosis, the red blood cells is an application of diffusion, and the ATP synthase is an application of active transport.
B. Na+-K+ ATPase is an application of active transport, the red blood cells is an application of osmosis, and the ATP synthase is an application of diffusion.
C. Na+-K+ ATPase is an application of diffusion, the red blood cells is an application of active transport, and the ATP synthase is an application of osmosis.
D. Na+-K+ ATPase is an application of diffusion, the red blood cells is an application of osmosis, and the ATP synthase is an application of active transport
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Correct Answer: B
The candidate needs to recall the definition of osmosis, diffusion, and active transport and then apply it to the examples accordingly. Na+-K+ ATPase moves molecules against their concentrations, so it uses energy in an active transport mode. The red blood cells example shows that there is a passive movement of water from an area of low solute concentration to an area of high solute concentration. ATP synthase shows passive movement of hydrogen molecules from an area of high concentration to an area of low concentration, so it is a form of diffusion.

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Question 9
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The graph of  xy = 3 is symmetrical about which lines?

A. y = x, y = -x
B. y = 3x, y = -3x
C. y = x / 3, y = -x / 3
D. -y = x, y = -x
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Correct Answer: A
The equation of the line when rearranged gives a reciprocal graph. The candidate should recall that the graph is symmetrical around the lines listed. This is specific knowledge listed in the Subject Guide, found on page 342. The shape of the graph and its points of intersection should be recalled.


Question 10
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Above the Moon’s surface, an object falls from rest a distance h flawlessly. There is no air resistance since there is no atmosphere on the Moon. Calculate the ratio between the kinetic energy of the object at h/4 and the gravitational potential energy of the object at h, when the object has fallen to a height h/4 above the surface.

A. 4/3
B. 3/4
C. 16/9
D. 9/16
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Correct Answer: B
The candidate should be able to apply gravitational potential energy equation. Initial PE at rest =mgh.  Final PE when the object has fallen to a height h/4 above the surface= mgh/4. Hence, the loss in potential energy = ¾ mgh. This is equal to the gain in kinetic energy at h/4.  

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Question 11
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Which of the following would represent the most likely symptoms of damage to different parts of the blood?

Correct Answer: B
The candidate should recall that platelets aid clotting, white blood cells aid disease defense, and red blood cells allow oxygen transport. Knowledge of this would make the symptoms seen appropriate. This is specific knowledge listed in the Subject Guide.

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Question 12
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Consider the following information about the four metals U, V, W,  and X:
  • An oxide of U will only decompose if heated.
  • W can react with cold water.
  • When X is added to nitrated V, no observable change is noted.
What is the correct order of the reactivity of these four metals?

A. V < X < U < W
B. W < V < X < U
C. U < X < V < W
D. U < V < X < W
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Correct Answer: C
Because an oxide of U will only decompose if heated, it suggests it has the lowest reactivity. Because W can react with cold water, it suggests it has the highest reactivity. Because when X is added to nitrated V no observable change is noted, it suggests that the reactivity of V is higher than X.

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Question 13
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Complete the word equation for aerobic respiration in animals.
A. Glucose, carbon dioxide, water, oxygen, energy
B. Glucose, oxygen, water, carbon dioxide, energy
C. Glucose, energy, carbon dioxide, water, oxygen
D. Oxygen, glucose, lactic acid, water, carbon dioxide
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Correct Answer: B
This is specific knowledge listed in the Subject Guide. The candidates should be able to recall this equation, as well as the one for photosynthesis.
 

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Question 14, 15 and 16
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A constant current flows through a long vertical wire. The current produces a magnetic field. The strength of the magnetic field can be measured by a special instrument called a Hall probe connected to a meter as shown.
 
The Hall probe is placed at different distances r from the wire and the corresponding magnetic field strength B noted from the meter. It is suggested that the magnetic field strength B is inversely proportional to the distance r.
 
Which graph below shows this relationship ?
The mathematical relation between B and r is of the form B = k rⁿ, where k is a constant and n is an integer. If B is inversely proportional to r, what is the value of n?
 
A. -2
B. -1
C. +1
D. +2
 
One set of results is shown in the table below. Use some of the data from the table to check your value of n and to determine the value of k from one of the following options.
A. 12
B. 14
C. 16
D. 18
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Correct Answer: 14C , 15B, 16D

14) The candidate shall recognize the graph of an inverse relationship between two variables. Extra caution should be taken about the variables; if the relationship is between B and r², the right graph would have been E. A and D represent direct relationships, and B shows the magnetic field as a constant.

15) Since it is an inverse relationship, n should be -1 which makes it equivalent to B=k/r
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16) B= kr⁻¹=k/r. So, k=Br. Applying this set of data confirms k to be equal to 18.            

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Question 17
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Which of the following statements about red blood cells are correct?
 
  1. Mature red blood cells have a nucleus, enclosing DNA required to produce haemoglobin
  2. Red blood cells are a concave shape to increase the surface area for oxygen transport
  3. Red blood cells have 2 types of antigens: antigen A and antigen B
  4. Red blood cells have no mitochondria, but they have haemoglobin to aid in oxygen transport

A. 1,2,4
B. 2,3,4
C. 2,4
D. 2 only
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Correct Answer: C
1 can be eliminated since mature red blood cells don’t have any organelles (e.g. nucleus, mitochondria) in order to hold more haemoglobin which aids in the transport of oxygen. 3 can be eliminated since antigens are specific to white blood cells, nor RBCs. 2 is correct, and 4 is also correct. 

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Question 18
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The relative abundance of two isotopes of chlorine and two isotopes of bromine are listed below:
Which of the following species gives the highest peak showing from a mass spectrum of CH₂BrCl? Assume there are no significant isotopes of carbon or hydrogen.

Correct Answer: A

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Question 19
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Which of the following options happens while breathing?

A. The diaphragm relaxes and curves, the intercostal muscles relax, the volume increases, the pressure decreases, and the air flow is directed into the lungs.
B. The diaphragm relaxes and flattens, the intercostal muscles relax, the volume decreases, the pressure increases, and the air flow is directed out of the lungs.
C. The diaphragm contracts and curves, the intercostal muscles contract, the volume increases, the pressure decreases, and the air flow is directed into the lungs.
D. The diaphragm contracts and flattens, the intercostal muscles contract, the volume increases, the pressure decreases, and the air flow is directed into the lungs.
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Correct Answer: D
The candidate shall try the different options to get the right collection of actions. The candidate must recall that upon inhalation, the diaphragm flattens when contracted, along with the intercostal muscles, causing volume to increase and pressure to decrease – this causes air to flow in.

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Question 20
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Which of the following statements about homologous series cycloalkene is incorrect?

A. It can react with hydrogen bromide.
B. The general formula of cycloalkene is CnH₂(n-m)
C. It gives more dark smoke when burning compared to cycloalkane with the same number of carbon atoms.
D. It can change acidified potassium dichromate from orange to green.


Correct Answer: D
The candidate shall have knowledge that the carbon-carbon double bond in cycloalkane cannot reduce acidified potassium dichromate.

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Question 21
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Short dendrites carry impulses from sensory neurons to the cell body of an X neuron. Which structure is this true for? And what is that X neuron?

A. Relay neuron, Motor neuron
B. Motor neuron, Synapse
C. Synapse, Motor neuron
D. Sensory neuron, Relay neuron
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Correct Answer: A
Relay neurons are present in between sensory and motor neuron – when dendrites carry impulses from the axon of the sensory neuron to the cell body of the motor neuron, and then the cell carries them onwards.

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Question 22
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Evaluate the following:

Correct Answer: C
Expansion of the brackets and addition of the terms forms the expression listed. Surd rules should be used appropriately. This is specific knowledge listed in the Subject Guide.

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Question 23
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Correct Answer: B

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Question 24
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Which of the following statements regarding movement across membrane are correct?

  1. Diffusion is the passive movement of molecules from an area of high concentration to an area of low concentration.
  2. Osmosis is the passive movement of water through a semi-permeable membrane, from an area of high solute concentration to an area of low solute concentration.
  3. An example of active transport is in the digestive system, where solutes are uptaken against their concentration gradient.
  4. If respiration was inhibited, active transport would stop.​

A. 1,3,4
B. 1,2,3
C. 2,3,4
D. 1,4
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Correct Answer: A
2 can be eliminated as osmosis is the transport of water from a high ‘water concentration’ or solute dilute, to a low ‘water concentration’ or solute concentrated. The other statements are correct.

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Question 25
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The diagram shows a ray of light passing from air into glass.
 
The ray of light changes direction as it enters the glass. What is this effect?   

A. Reflection where light moves more slowly upon crossing into the glass.
B. Refraction where light moves faster upon crossing into the glass.
C. Interference where light is condensed upon crossing into the glass.
D. Refraction where light moves more slowly upon crossing into the glass.
E. Diffraction where light is scattered upon crossing into the glass.

Correct Answer: D
The candidate must understand the refraction at a boundary and its effect on speed.

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Question 26
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A couple, without a condition carried by a recessive allele, have a child with the condition. Which of the following statements are incorrect?
 
  1. One parent must have two copies of the recessive allele
  2. If the child reproduced with another carrier, the offspring would have the condition indefinitely
  3. Both parents must be carriers

A. 1,2,3
B. 2,3
C. 3 only
D. 1,2
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Correct Answer: D
1 and 2 are incorrect, but 3 (correct) can be eliminated by creating a Punnett square and working retrospectively to find the genotypes of the parents. Both must be carriers, as they don’t have the disease but have passed it down to the offspring.
The genotypes highlighted in bold show the genotypes of the offspring. This means that if they reproduce with another carrier or unaffected individual, their offspring will not indefinitely have the condition.


Question 27
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An organic compound is 52% carbon, 13% hydrogen and the rest is oxygen by mass percent.
9.2 g of a gaseous sample of this compound would have a volume of 4.8 dm³ at room temperature and pressure. Which of the following compounds would this be?
 
(Ar: H=1; C=12; O=16)
(1 mole of any gas occupies 24dm³ at room temperature and pressure)

Correct Answer: E