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## Mock Exam F : BMAT Section 2

*27 Questions, 30 Minutes*

## Question 1

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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*

Question 3

*Evaluate the following expression:*

Question 4

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*

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.*

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Question 9

*Simplify the following expression:*

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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.*

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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.*

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*

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Question 14

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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*

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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 |

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Question 17

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Question 18

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Question 19

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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*

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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*

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Question 22

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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.*

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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

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Question 25

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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.*

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Question 27

*Which of the following ionic equations are correct?*