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## Mock Exam F : BMAT Section 2

*27 Questions, 30 Minutes*

## Question 1

The candidate needs to calculate the force constant from the provided graph in SI units first as follow: k= F/x= 12N/0.06m= 200N/m. Then the new extension distance should be calculated using k and the new force as follows: extension distance= F/k= 5/200= 0.025m= 2.5cm.

**Correct Answer:****D**The candidate needs to calculate the force constant from the provided graph in SI units first as follow: k= F/x= 12N/0.06m= 200N/m. Then the new extension distance should be calculated using k and the new force as follows: extension distance= F/k= 5/200= 0.025m= 2.5cm.

##

Question 2

*Which of the following examples does/do represent natural selection?*

*Scientists modifying corn genetically to resist harmful insects and bacteria.**In an era of floods, lizards that had the genetic variant of long legs were able to survive where this phenotype was then developed to suit their new environment.**In a forest with no low-lying shrubs, giraffes would modify their genes by themselves to long necks so as to get food.*

*A. 1 only*

*B. 2 only*

*C. 1 and 2*

*D. 2 and 3*

*E. All of them*

The candidate should understand that natural selection is different from artificial selection; it happens naturally without the human interventions. So, 1 can be eliminated. The candidate should have the knowledge that individuals within a population are naturally variable where some of the individuals might carry genetic variants that get functional to have traits better suited to the environment than others. It should be clear that organisms themselves can’t control the selection; they can’t modify their genetic make-up. So, 3 is eliminated as well. Hence, 2 only is the correct answer.

**Correct Answer:****B**The candidate should understand that natural selection is different from artificial selection; it happens naturally without the human interventions. So, 1 can be eliminated. The candidate should have the knowledge that individuals within a population are naturally variable where some of the individuals might carry genetic variants that get functional to have traits better suited to the environment than others. It should be clear that organisms themselves can’t control the selection; they can’t modify their genetic make-up. So, 3 is eliminated as well. Hence, 2 only is the correct answer.

Question 3

*Evaluate the following expression:*

Expansion of the brackets and addition of the terms form the expression listed. Surd rules should be used appropriately. This is specific knowledge listed in the Subject Guide.

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

Question 4

Percentage by mass of Cu in each mineral:

**Correct Answer:****B**Percentage by mass of Cu in each mineral:

Question 5, 6 & 7

*A couple are both suffering from polydactyly, a condition affecting the limbs. This is carried on one dominant allele. The couple have 8 children. How many of the children, statistically, should have the disease?*

*A. 2*

*B. 4*

*C. 6*

*D. 8*

Using the information above, how many children will have an affected child indefinitely if they reproduce?

Using the information above, how many children will have an affected child indefinitely if they reproduce?

*A. 4*

*B. 2*

*C. 6*

*D. 8*

Using the information above, give the genotype of the unaffected child. (D=faulty allele, d=normal allele)

Using the information above, give the genotype of the unaffected child. (D=faulty allele, d=normal allele)

*A. Dd*

*B. dD*

*C. DD*

*D. dd*

Correct Answer: 5C,6B,7D5)75% should have the disease, either carriers or homozygous sufferers. A punnet square can be used to identify the genotypes. As 75% are affected by the disease, 75% of the 8 children would be 6 children. 6) Only the homozygous sufferer will indefinitely have an affected child, as the carriers may reproduce with a non-sufferer or carrier to have an unaffected child. One of 4 (25%) was a homogenous sufferer, so 2 of the 8 children will indefinitely have an affected child. 7) A punnet square can be used to find the genotype. As this is an unaffected child, and this is a dominant disease, they must have 2 recessive alleles. The genotype highlighted in bold indicates the unaffected child |

Question 8

*A pulse of sound from the bottom of a boat is used to find fish. The sound travels through the water and is reflected from a shoal of fish directly to the boat. The sound reaches the boat after 1.2s. The speed of sound in water is 1500 m/s.*

Total distance the sound travelled= sound speed x time= 1500 x 1.2= 1800m. Since the sound travels from the boat to the shoal of fish, and it is then reflected from the shoal of fish to the boat, the distance between the boat and the shoal of fish= 1800/2= 900m.

Correct Answer:Correct Answer:

**B**Total distance the sound travelled= sound speed x time= 1500 x 1.2= 1800m. Since the sound travels from the boat to the shoal of fish, and it is then reflected from the shoal of fish to the boat, the distance between the boat and the shoal of fish= 1800/2= 900m.

##

Question 9

*Simplify the following expression:*

The applicant should be able to multiply/dividing factors having the same base by adding/subtracting their exponents as follows

**Correct Answer: A**The applicant should be able to multiply/dividing factors having the same base by adding/subtracting their exponents as follows

##

Question 10

*Which of the following statements about calcium is*

**incorrect**?

*A. Its electronic arrangement is 2,8,8,2.*

*B. When it is put into a trough of water, a brick-red flame is produced.*

*C. The structure of calcium is a giant metallic structure.*

*D. Its chemical reactivity is slower than strontium.*

**

Calcium will only give a brick-red flame when heated. Both of the electronic and physical structures in A and C are correct. The candidate also needs to remember the reactivity series to know that calcium is less reactive than strontium.

**Correct Answer: B**Calcium will only give a brick-red flame when heated. Both of the electronic and physical structures in A and C are correct. The candidate also needs to remember the reactivity series to know that calcium is less reactive than strontium.

##

Question 11 & 12

Find the volume of a cone with height of 10 units and a radius of 2 units.

*Using the measurements above, find the volume of the frustum when a cone with a height of 4 units and radius of 1 unit is removed.*

11) The equation to find the volume of a cone should be used. This is specific knowledge listed in the Subject Guide and should be recalled by the candidate. Extra care should be taken when calculating this as there are fractions present.

**Correct Answer: 11B, 12C**11) The equation to find the volume of a cone should be used. This is specific knowledge listed in the Subject Guide and should be recalled by the candidate. Extra care should be taken when calculating this as there are fractions present.

*12) To calculate the volume of the frustum, the volume of the smaller cone that is removed should be subtracted from the total volume.*

Question 13

*Which of the following are correct reasons why species become extinct?*

*The environment changes too quickly for the species to adapt**A disease kills them all**They cannot compete for food**A predator is introduced, and kills them*

*A. 1,2,3*

*B. 2,3,4*

*C. 2,4*

*D. All are correct*

This is specific knowledge listed in the Subject Guide (page 68) and should be recalled by the candidate.

A species can become extinct when:

**Correct Answer: D**This is specific knowledge listed in the Subject Guide (page 68) and should be recalled by the candidate.

A species can become extinct when:

*The environment changes too quickly**A new predator is introduced**A new disease kills them**They can’t outcompete a species for food**A catastrophic event occurs**Speciation*

##

Question 14

When completely burned in air, carbon changes into carbon dioxide, hydrogen changes into water, and sulphur changes into sulphur dioxide.

**Correct Answer: E**When completely burned in air, carbon changes into carbon dioxide, hydrogen changes into water, and sulphur changes into sulphur dioxide.

##

Question 15

*What is the definition of ‘’Union” sets?*

*A. The probability of only one event happening*

*B. The probability of 2 events happening at the same time*

*C. The intersection between two sets*

*D. The set that contains all elements of the set*

**

This is specific knowledge listed in the Subject Guide and should be recalled by the candidate. This can be represented well by a Venn diagram – in this case, the whole diagram should be shaded.

Correct Answer: DCorrect Answer: D

This is specific knowledge listed in the Subject Guide and should be recalled by the candidate. This can be represented well by a Venn diagram – in this case, the whole diagram should be shaded.

##

Question 16

The following diagrams show a wave on the surface of water in a tank at times 1.0s apart. The wave is produced at P and travels to the right.Which of the following options gives the frequency and the speed of this water wave? A. Frequency of 2Hz and speed of 4cm/sB. Frequency of 2Hz and speed of 8cm/sC. Frequency of 4Hz and speed of 4cm/sD. Frequency of 4Hz and speed of 8cm/s |

*4cm/0.5s*

The candidate should be able to recognize that in one second the wave was able to go from peak to peak twice. So, the frequency is 2Hz. The period is 1/frequency= 0.5s. That means the speed equals to

**Correct Answer: B**The candidate should be able to recognize that in one second the wave was able to go from peak to peak twice. So, the frequency is 2Hz. The period is 1/frequency= 0.5s. That means the speed equals to

*= 8cm/s.*

##

Question 17

A is the only option that does not involve bond breaking, meaning that is does not require energy. So, all the other options can be eliminated. “A” represents a reaction between an oxide of calcium metal with water to form an alkaline solution where heat is produced.

**Correct Answer: A**A is the only option that does not involve bond breaking, meaning that is does not require energy. So, all the other options can be eliminated. “A” represents a reaction between an oxide of calcium metal with water to form an alkaline solution where heat is produced.

##

Question 18

Expansion of the brackets and addition of the terms form the expression listed. Surd rules should be used appropriately. This is specific knowledge listed in the Subject Guide.

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

##

Question 19

*²*

Minimum pressure occurs when the block rests on its largest face i.e. (10x5) = 50 cm

**Correct Answer: D**Minimum pressure occurs when the block rests on its largest face i.e. (10x5) = 50 cm

*(0.005 m*²

*). Pressure = Weight/area = (mass x gravity)/ area= (10N)/50cm*²

*= 0.2N/cm*²

##

Question 20

*A piece of DNA is analysed, and the base sequence is as follows: AATTGCTGA*

What would be the complementary sequence?

What would be the complementary sequence?

*A. UUAACGACU*

*B. AATCGCTAC*

*C. GGCCATCAG*

*D. GGGGTAGTG*

*E. None of the above*

Complementary base pairing should be used in order to find the sequence. A-T, C-G should be used. Nothing of the provided sequences would match. The candidate should be careful while pairing as option A is misleading; it is a matching complement strand but for RNA not DNA.

Correct Answer: ECorrect Answer: E

Complementary base pairing should be used in order to find the sequence. A-T, C-G should be used. Nothing of the provided sequences would match. The candidate should be careful while pairing as option A is misleading; it is a matching complement strand but for RNA not DNA.

##

Question 21

*25 cm*³

*of 0.10 mol.dm–*³

*magnesium chloride solution is mixed with 10 cm*³

*of 0.40 mol.dm–*³

*hydrochloric acid. What is the concentration of chloride ions in the resulting solution?*

*A. 0.186M*

*B. 0.257M*

*C. 0.300M*

*D. 0.371M*

**

Correct Answer: BCorrect Answer: B

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Question 22

5N force produces 4 cm extension. So, 1N produces 0.8cm extension. And hence, 7N force will produce (7 x 0.8) cm extension = 5.6cm.

**Correct Answer: A**5N force produces 4 cm extension. So, 1N produces 0.8cm extension. And hence, 7N force will produce (7 x 0.8) cm extension = 5.6cm.

##

Question 23

*James buys a round football and wants to calculate the volume of air needed to fill it. Calculate the volume of the ball, with a radius of 5 units.*

The equation to find the volume of a sphere should be used here. This is specific knowledge listed in the Subject Guide and should be recalled by the candidate.

**Correct Answer: A**The equation to find the volume of a sphere should be used here. This is specific knowledge listed in the Subject Guide and should be recalled by the candidate.

##

Question 24

*Element*

**X**occurs in nature in two isotopes, 107**X**and 109**X**. The table below lists the relative abundance of each isotope:*What is the relative atomic mass of*

A. 107.50

B. 107.97

C. 108.03

D. 108.50

**X**?A. 107.50

B. 107.97

C. 108.03

D. 108.50

Relative atomic mass of X = (107´0.515) + (109´0.485) = 107.97

Correct Answer: BCorrect Answer: B

Relative atomic mass of X = (107´0.515) + (109´0.485) = 107.97

##

Question 25

**Correct Answer: D**##

Question 26

*Kate and Liz are playing a game, taking it in turns to take counters out of a bag. There are 5 red counters and 7 yellow counters. Calculate the probability when Kate picks a red, Liz picks a red, and then Kate picks another yellow counter. The girls don’t put the counters back in the bag after they have been picked. Then perform another calculation for the same scenario when the girls put the counters back in the bag. Choose the answers in the respective order of not putting the counters in the bag, putting them back.*

A tree diagram should be used here to follow the probabilities. Extra care should be taken with the multiplication as these are large numbers.

For when they don’t put the counters in the bag, the AND rule should be applied:

Kate picks red = 5/12

Liz picks red = 4/11

Kate picks yellow = 7/10

Multiplying these probabilities together gives = 140 / 1320 = 7/ 66

For when they put the counters in the bag,

Kate picks red = 5/12

Liz picks red = 5/12

Kate picks yellow = 7/12

Multiplying these probabilities together gives = 175 / 1728

**Correct Answer: B**A tree diagram should be used here to follow the probabilities. Extra care should be taken with the multiplication as these are large numbers.

For when they don’t put the counters in the bag, the AND rule should be applied:

Kate picks red = 5/12

Liz picks red = 4/11

Kate picks yellow = 7/10

Multiplying these probabilities together gives = 140 / 1320 = 7/ 66

For when they put the counters in the bag,

Kate picks red = 5/12

Liz picks red = 5/12

Kate picks yellow = 7/12

Multiplying these probabilities together gives = 175 / 1728

##

Question 27

*Which of the following ionic equations are correct?*

The candidate should be able to the atom(s) and charge(s) on both sides of the ionic equation.

**Correct Answer: D**The candidate should be able to the atom(s) and charge(s) on both sides of the ionic equation.