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## Mock Exam B (1): BMAT Section 2

*27 Questions, 30 Minutes*

## Question 1

*Which of the following statements describes the characteristics of nerves and hormones correctly?*

*A. Nerves are fast, short term, precise, and initiate electrical signals, while hormones are slow, long term, have general target, and initiate chemical signals.*

*B. Nerves are fast, long term, precise, and initiate chemical signals, while hormones are slow, short term, have general target, and initiate electrical signals.*

*C. Nerves are fast, short term, have general target, and initiate electrical signals, while hormones are slow, short term, have precise target, and initiate chemical signals.*

*D. Nerves are slow, short term, have precise target, and initiate electrical signals, while hormones are fast, long term, have general target, and initiate chemical signals.*

The candidate must recall that nerves have a fast action which are short term (discrete) and precise. The nerves initiate electrical signals. This is contrasted by hormones which have slow activity, with long term effects and have a general target. Hormones are chemical messengers. This specific knowledge is listed in the Subject Guide – specification points 9.2a and 9.4.

**Correct Answer:****A**The candidate must recall that nerves have a fast action which are short term (discrete) and precise. The nerves initiate electrical signals. This is contrasted by hormones which have slow activity, with long term effects and have a general target. Hormones are chemical messengers. This specific knowledge is listed in the Subject Guide – specification points 9.2a and 9.4.

##

Question 2 and 3

*2) This garden decoration consists of a full cylinder (including the 2 bases) and a circular disc. The circular disc has a radius of r, each of the cylinders bases has a radius of r/3 , and the cylinder has height of 4r. What is the total area of this decoration?*

*3) If one tin of paint coats an area of 2r*²

*once, how many tins of paint will you need to buy to coat the whole decoration twice?*

*A. 6.1*

*B. 7*

*C. 12.2*

*D. 13*

2) This question requires the candidate to find the area of the shapes individually, and then adds them to form a simplified expression. The candidate must be able to recall the equation for area of a circle, the circumference of a circle, and area of cylinder. These expressions then must be manipulated to produce one expression.

**Correct Answers:****2B, 3D**2) This question requires the candidate to find the area of the shapes individually, and then adds them to form a simplified expression. The candidate must be able to recall the equation for area of a circle, the circumference of a circle, and area of cylinder. These expressions then must be manipulated to produce one expression.

*3) After finding the decoration area, it should be divided by 2r*²

*to find the number of tins of paint required to coat the item once. Since the whole decoration needs to be coated twice, that number should be doubled. The final answer of 12.2 should be rounded up to a whole number as you cannot buy a fraction of a tin of paint.*

Question 4

*Silver iodide reacts with iron (III) carbonate to form iron (III) iodide and silver carbonate.*

*What are the values of*

A. 1, 1, 1, 1

B. 6, 1, 2, 3

C. 2, 1, 2, 1

D. 6, 1, 3, 2

**a**,**b**,**c**and**d**?A. 1, 1, 1, 1

B. 6, 1, 2, 3

C. 2, 1, 2, 1

D. 6, 1, 3, 2

**Correct Answer:****B**

Question 5

*The graph of xy = 3 does not exist for which value of x?*

*A. x = 3*

*B. x = y*

*C. x = 0*

*D. The graph exists for all values of x*

The equation of the line when rearranged gives a reciprocal graph y= 3/x. The candidate should recall that the graph doesn’t exist for x=0. This is specific knowledge listed in the Subject Guide.

**Correct Answer:****C**The equation of the line when rearranged gives a reciprocal graph y= 3/x. The candidate should recall that the graph doesn’t exist for x=0. This is specific knowledge listed in the Subject Guide.

Question 6

*An object, initially at rest, is acted upon by a constant force. Which pair of graphs shows the variation of speed and kinetic energy of the object with time?*

Constant force produces constant acceleration. Hence gradient of speed/velocity – time graph must be constant i.e. straight line. Since the kinetic energy is proportional to speed squared while speed is proportional to time for a constant acceleration and the speed squared is NOT proportional to time, the kinetic energy will NOT be proportional to time. Hence, the graph is not a straight line but a curve.

Correct Answer:Correct Answer:

**B**Constant force produces constant acceleration. Hence gradient of speed/velocity – time graph must be constant i.e. straight line. Since the kinetic energy is proportional to speed squared while speed is proportional to time for a constant acceleration and the speed squared is NOT proportional to time, the kinetic energy will NOT be proportional to time. Hence, the graph is not a straight line but a curve.

##

Question 7

*Which of the following statements describe mitosis and meiosis the best?*

*Both of mitosis and meiosis have interphase.**Daughter cells produced through both mitosis and meiosis are genetically identical to the parent cell.**Both meiosis and mitosis take place in asexual reproduction**Comparing the number of cells produced, 4 rounds of mitosis produce the same number of cells as two events of meiosis.*

*A. 1 and 3*

*B. 2 and 3*

*C. 1 and 4*

*D. 3 and 4*

1 and 4 are correct. 1 is correct; interphase for both meiosis and mitosis is the period when the chromosomes replicate before dividing. 2 is incorrect since only mitosis produces identical daughter cells. 3 is incorrect because asexual reproduction is a form of mitosis by producing clones of the parent cells. 4 is correct; since mitosis produces 2 daughter cells per round, the total after 4 round will be 8 cells. Meiosis givers 4 daughter cells at a round, so that will be 8 cells after 2 events.

**Correct Answer:****C**1 and 4 are correct. 1 is correct; interphase for both meiosis and mitosis is the period when the chromosomes replicate before dividing. 2 is incorrect since only mitosis produces identical daughter cells. 3 is incorrect because asexual reproduction is a form of mitosis by producing clones of the parent cells. 4 is correct; since mitosis produces 2 daughter cells per round, the total after 4 round will be 8 cells. Meiosis givers 4 daughter cells at a round, so that will be 8 cells after 2 events.

##

Question 8

The candidate must use Pythagoras’s theorem here to find the length of the side. Both should be squared, and the smaller side subtracted from the longest one. The square root of the result will be the length of the smaller side.

**Correct Answer:****A**The candidate must use Pythagoras’s theorem here to find the length of the side. Both should be squared, and the smaller side subtracted from the longest one. The square root of the result will be the length of the smaller side.

##

Question 9

*An ore of iron contains 68% FeS₂. Calculate the mass of ore required to produce 100 kg of iron.*

Assume the extraction efficiency is 100%. (Ar: Fe=56; S=32)

A. 68 kg

B. 147 kg

C. 214 kg

D. 315 kg

Assume the extraction efficiency is 100%. (Ar: Fe=56; S=32)

A. 68 kg

B. 147 kg

C. 214 kg

D. 315 kg

*÷*

Percentage by mass of Fe in FeS₂ = (56 / 120)x100% = 46.7%

Mass of ore required = 100kg

**Correct Answer:****D**Percentage by mass of Fe in FeS₂ = (56 / 120)x100% = 46.7%

Mass of ore required = 100kg

*0.68*÷

*0.467 = 315 kg*

Question 10

*Which of the following statements describe the number of cycles that pass a point per second?*

*A. The speed of electromagnetic waves but not sound wave.*

*B. The wavelength of any type of waves, and it is measured in Hertz.*

*C. The frequency of a wave, and it is the reciprocal of period.*

*D. The amplitude of a wave, and it does not have units.*

The candidate must be able to recall the meaning of the terms: amplitude, wavelength, frequency and period, eliminating A, B, and D. Although frequency is measured in Hertz, the first clause of the B sentence is incorrect. The candidate should be able to recall that frequency is the reciprocal of period.

**Correct Answer:****C**The candidate must be able to recall the meaning of the terms: amplitude, wavelength, frequency and period, eliminating A, B, and D. Although frequency is measured in Hertz, the first clause of the B sentence is incorrect. The candidate should be able to recall that frequency is the reciprocal of period.

##

Question 11

*The area of a rectangular patio is 16 squared units. One length is x cm long, and the other is 3x + 8 cm long. Calculate the value of x.*

*A. -4*

*B. -4, 4 / 3*

*C. 4 / 3*

*D. 4*

The candidate must multiply the two expressions for the sides, and equate this to the area. Converting this to a quadratic equation and factorising gives 2 roots. The value cannot be a negative number, and thus the positive root is only taken.

**Correct Answer:****C**The candidate must multiply the two expressions for the sides, and equate this to the area. Converting this to a quadratic equation and factorising gives 2 roots. The value cannot be a negative number, and thus the positive root is only taken.

*16=x ×(3x+8)*

x ×(3x+8)-16=0

3x²+8x-16=0

Factorising this gives (x+4)(3x-4)

Values of x are -4 and 4/3

x cannot be negative,so the positive root is taken

x ×(3x+8)-16=0

3x²+8x-16=0

Factorising this gives (x+4)(3x-4)

Values of x are -4 and 4/3

x cannot be negative,so the positive root is taken

##

Question 12

*The following chemicals are mixed together. In which of the mixtures will a displacement reaction occur?*

*A. 2 only*

*B. 2 and 3 only*

*C. 3 and 4 only*

*D. 1 and 2 only*

*E. 1, 2 and 4 only*

*F. 2, 3 and 4 only*

The candidate must understand how to apply a displacement reaction in terms of the reactivity competition of elements, as follows:

Correct Answer:Correct Answer:

**F**The candidate must understand how to apply a displacement reaction in terms of the reactivity competition of elements, as follows:

##

Question 13

*Which of the following statements is/are correct?*

*Mitosis is cell division for gamete formation, with a haploid number of chromosomes that are genetically different to the parent cells**Mitosis is the cell division for repair and growth, with a diploid number of chromosomes that are identical to the parent cells**Meiosis is the cell division for gamete formation, with a haploid number of chromosomes that are genetically different to the parent cells**Meiosis produces 2 daughter cells**Mitosis produces 2 daughter cells*

*A. 1,2,3*

*B. 3,4,5*

*C. 1,5*

*D. 2,3,5*

The candidate must recall that mitosis produces identical cells for repair and growth – somatic cells, and that meiosis produces gametes – and the characteristics of these must be inferred by their division process. This specific knowledge is listed in the Subject Guide.

Correct Answer:Correct Answer:

**D**The candidate must recall that mitosis produces identical cells for repair and growth – somatic cells, and that meiosis produces gametes – and the characteristics of these must be inferred by their division process. This specific knowledge is listed in the Subject Guide.

##

Question 14

*The area of a rectangular patio is found to be 12x² - 4x - 8 , where x is an arbitrary unit. Which of the following are possible dimensions of the patio?*

A. (3x-2)(4x-4)

B. (4x+2)(3x-4)

C. (3x+2)(4x-4)

D. (6x-2)(2x-4)

A. (3x-2)(4x-4)

B. (4x+2)(3x-4)

C. (3x+2)(4x-4)

D. (6x-2)(2x-4)

The candidate must factorise the expression here in order to find the possible dimensions, as area is the product of length and width.

**Correct Answer:****C**The candidate must factorise the expression here in order to find the possible dimensions, as area is the product of length and width.

*Factors making 12:6,2 or 12,1 or 4,3*

Using 4,3

Both brackets must contain x and a constant

(4x+?)(3x+?)→one constant must be negative

Matching different constants gives (3x+2)(4x-4)

Using 4,3

Both brackets must contain x and a constant

(4x+?)(3x+?)→one constant must be negative

Matching different constants gives (3x+2)(4x-4)

##

Question 15

*Which of the following describes the ultrasound range ?*

*A. They are traverse waves with a frequency of 30 Hz*

*B. They are sound waves with a frequency of 300 Hz*

*C. They have a frequency of 3000 Hz, and humans can hear it.*

*D. They are longitudinal waves with a frequency of 30,000 Hz*

The candidate must recall that ultrasound waves are longitudinal with frequencies greater then 20 kHz. Hence, humans can’t hear them as the range of human hearing is 20 Hz to 20 kHz.

**Correct Answer:****D**The candidate must recall that ultrasound waves are longitudinal with frequencies greater then 20 kHz. Hence, humans can’t hear them as the range of human hearing is 20 Hz to 20 kHz.

##

Question 16

*How many moles of oxygen will be produced if 6 moles of potassium permanganate are decomposed?*

*A. 6*

*B. 2*

*C. 4*

*D. 3*

The candidate should balance the equation first as follows:

**Correct Answer:****D**The candidate should balance the equation first as follows:

*Based on that, the number of moles of oxygen can be calculated = 6 x 1 /2= 3 moles.*

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Question 17

*The candidate must use Pythagoras’s theorem here to find the length of the hypotenuse. The smaller sides should be squared and then added. The square root of the result will be the length of the hypotenuse.*

##

Question 18

*A compound of nitrogen and oxygen contains 36.4g of nitrogen and 20.8g of oxygen. Which of the following would be its formula? (Ar: N = 14, O = 16)*

The candidate shall be able to find the compound formula by calculating the number of moles of its elements and then finding the ration between them, as follows:

**Correct Answer:****B**The candidate shall be able to find the compound formula by calculating the number of moles of its elements and then finding the ration between them, as follows:

##

Question 19

*The area of a rectangular patio is found to be 6x²-13x-63 , where x is an arbitrary unit. Which of the following are possible dimensions of the patio?*

A. (2x+9)(3x-7)

B. (2x-9)(3x+7)

C. (3x-9)(2x+7)

D. (3x+9)(2x-7)

A. (2x+9)(3x-7)

B. (2x-9)(3x+7)

C. (3x-9)(2x+7)

D. (3x+9)(2x-7)

The candidate must factorise the expression here in order to find the possible dimensions, as area is the product of length and width.

**Correct Answer:****B**The candidate must factorise the expression here in order to find the possible dimensions, as area is the product of length and width.

*Factors making 6:6,1 or 2,3*

Using 2,3

Both brackets must contain x and a constant

(2x+?)(3x+?)→one constant must be negative

Matching different constants gives (2x-9)(3x+7)

Using 2,3

Both brackets must contain x and a constant

(2x+?)(3x+?)→one constant must be negative

Matching different constants gives (2x-9)(3x+7)

##

Question 20

*The graph below shows the variation of acceleration with time for an object. What physical quantity can be deduced from this graph and how is this calculated ?*

The candidate must be able to comprehend that change in velocity can be deduced from the graph since acceleration is the velocity over time. To calculate it, candidate must understand that average acceleration is half the final acceleration at a. So, the velocity = average acceleration x time =

1 / 2 a t . This corresponds to the area of triangle under the line.

**Correct Answer:****A**The candidate must be able to comprehend that change in velocity can be deduced from the graph since acceleration is the velocity over time. To calculate it, candidate must understand that average acceleration is half the final acceleration at a. So, the velocity = average acceleration x time =

1 / 2 a t . This corresponds to the area of triangle under the line.

##

Question 21

*1.82 g of butan-1-ol is reacted with excess hydrogen bromide to produce 1.50 g of 1-bromobutane according to the following equation:*

*What is the percentage yield of the reaction?*

(Ar : H=1; C = 12; O = 16; Br = 80)

(Ar : H=1; C = 12; O = 16; Br = 80)

*A. 24.6%*

*B. 44.5%*

*C. 72.5%*

*D. 82.4%*

The candidate must calculate the number of moles of the limiting reagent butan-1-ol to know the theoretical number of moles and yield of 1-bromobutane, as follows:

C4H9OH + HBr ® C4H9Br + H2O

Mass 1.82g

Mole 1.82/74 = 0.0246

Theoretical yield of C4H9Br = 0.0246 x 137 = 3.37g

Percentage yield of C4H9Br = (1.50/3.37) x 100% = 44.5%

**Correct Answer:****B**The candidate must calculate the number of moles of the limiting reagent butan-1-ol to know the theoretical number of moles and yield of 1-bromobutane, as follows:

C4H9OH + HBr ® C4H9Br + H2O

Mass 1.82g

Mole 1.82/74 = 0.0246

Theoretical yield of C4H9Br = 0.0246 x 137 = 3.37g

Percentage yield of C4H9Br = (1.50/3.37) x 100% = 44.5%

##

Question 22

*A linear sequence can be described in terms of n by the following expression:*

9(n+7)+12

What would be the 1th, 3th and 1200th term of this sequence respectively

A. 84, 102, 10875

B. 84, 102, 10868

C. 84, 98, 1207

D. 28, 102, 1075

9(n+7)+12

What would be the 1th, 3th and 1200th term of this sequence respectively

A. 84, 102, 10875

B. 84, 102, 10868

C. 84, 98, 1207

D. 28, 102, 1075

The candidate must substitute the terms into the expression (for n) to give the values. Extra care should be taken when calculating the values, as these are larger numbers.

**Correct Answer:****A**The candidate must substitute the terms into the expression (for n) to give the values. Extra care should be taken when calculating the values, as these are larger numbers.

*1st Term:9(1+7)+12=84*

3rd Term:9(3+7)+12=102

1200th Term:9(1200+7)+12=10875

3rd Term:9(3+7)+12=102

1200th Term:9(1200+7)+12=10875

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Question 23

*Which of the following statements about stem cells are correct?*

*Adult stem cells are more able to differentiate than embryonic stem cells**Stem cells can be found in the bone marrow**Stem cells found in embryos are able to form any type of cell*

*A. 1,2*

*B. 1,3*

*C. 2,3*

*D. All are correct*

The candidate must establish that both types of cell are able to differentiate, but embryonic stem cells are more versatile (totipotent) than adult stem cells (pluripotent) – this eliminates option 1, leaving the other 2 options correct.

**Correct Answer:****C**The candidate must establish that both types of cell are able to differentiate, but embryonic stem cells are more versatile (totipotent) than adult stem cells (pluripotent) – this eliminates option 1, leaving the other 2 options correct.

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Question 24

*Nitrogen monoxide can be prepared from copper and dilute nitric acid.*

*Choose the correct state symbols for the above reaction from the following table.*

*₃*

The candidate must know and be able to use the state symbols: solid (s), liquid (l), gas (g), aqueous solution (aq). The candidate can eliminate C, D, and E since H2O should be liquid, and NO should be gas. The solution Cu(NO

**Correct Answer:****A**The candidate must know and be able to use the state symbols: solid (s), liquid (l), gas (g), aqueous solution (aq). The candidate can eliminate C, D, and E since H2O should be liquid, and NO should be gas. The solution Cu(NO

*)*₂

*should have the aqueous symbol not liquid, so B can be eliminated, as well.*

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Question 25 and 26

*A D.C. supply has to be connected across coil X.**An A.C. supply has to be connected across coil X.**Number of turns in coil Y > number of turns in coil X.**Number of turns in coil Y < number of turns in coil X.**The microammeter will show a steady deflection.**The microammeter will show a changing deflection.*

*A. 2 and 4*

*B. 2, 4 and 6*

*C. 3, 4 and 6*

*D. 3 and 6*

*The transformer is described as 100% efficient. What does this mean?*

A. The current in Y must equal the current in X

A. The current in Y must equal the current in X

*B. The voltage across Y must equal the voltage across X*

*C. The resistance of Y must equal the resistance of X*

*D. There is no magnetic field passing through the soft-iron core*

*E. The power in Y must equal the power in X.*

25) The candidate should understand that step-down transformers are designed to reduce the voltage from primary to secondary. The candidate should also be able to use the relationship between the number of turns on the primary and secondary coils, and the voltage ratio:

Correct Answers:Correct Answers:

**25B, 26E**25) The candidate should understand that step-down transformers are designed to reduce the voltage from primary to secondary. The candidate should also be able to use the relationship between the number of turns on the primary and secondary coils, and the voltage ratio:

*26) The candidate should know that the consequence of 100% efficiency is total transfer of electrical power, where VpIp = VsIs*

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Question 27

*The area of a rectangular patio is 9 squared units. One length is x cm long and the other is 2x + 3 cm long. Calculate the value of x.*

A. 3 / 2

B. -3

C. 3

D. -3, 3 / 2

A. 3 / 2

B. -3

C. 3

D. -3, 3 / 2

The candidate must multiply the two expressions for the sides, and equate this to the area. Converting this to a quadratic equation and factorising gives 2 roots. The value cannot be a negative number, and thus the positive root is taken.

**Correct Answer:****A**The candidate must multiply the two expressions for the sides, and equate this to the area. Converting this to a quadratic equation and factorising gives 2 roots. The value cannot be a negative number, and thus the positive root is taken.

*9=x ×(2x+3)*

x ×(2x+3)-9=0

2x²

x ×(2x+3)-9=0

2x

*+3x-9=0*

Factorising this gives (x+3)(2x-3) Values of x are-3 and 3/2

x cannot be negative,so the positive root is taken

Factorising this gives (x+3)(2x-3) Values of x are-3 and 3/2

x cannot be negative,so the positive root is taken