Section II

Questions 7 - 12

Question 7
In a power station electricity is generated at 25,000V. A transformer is used to increase this to 50,000V. Which of the following gives the correct relationship between the number of turns in the primary and secondary coils required to achieve this?

A turns on primary is 2x turns on secondary
B turns on primary is 4x turns on secondary
C turns on secondary is 2x turns on primary
D turns on secondary is 4x turns on primary
E turns on primary and secondary are the same

Question 8
The general formula of the alkanes is given by the formula C_nH_2n+2

In the alcohols the general structure of the compounds is the same as the alkanes, but with the introduction of an OH group.

The general formula of the alcohols can therefore be written as:

A C_nH_2nO

B C_nH_2n+2O

C C_nH_2n+1O

D C_nH_3nO

Question 9
Alf and Bill work together in the same school. They bet that, on a particular day, they will come into work wearing the same coloured tops.

Alf has 8 tops        2 white, 2 blue and 4 grey

Bill has 10 tops      4 white, 3 blue and 3 grey

What is the probability that they both wear the same colour top?

Question 10
The diagram shows the human stomach.

How does the liquid at Y differ from the liquid at X?

A less acidic, less starch, more sugar
B less acidic, more starch, less sugar
C more acidic, less protein, more peptides
D more acidic, more protein, fewer peptides

Question 11
A radio station uses a frequency of 1000 kHz to broadcast. Given that radio waves travel at approximately 3x10⁸ m/s which of the following gives the correct wavelength of these waves?

A 3m
B 30m
C 300m
D 3km
E 30km

Question 12
The following gives the electronic arrangement of a number of elements, represented A to F.

Element A – 2,8,8

Element B – 2,4

Element C – 2,8,1

Element D – 2,8,8,2

Element E – 2,7

Element F – 2,8,7

For each of the following statements suggest the element which is most likely being identified.

1) This element is in group 4 and period 2 of the periodic table
2) This element reacts vigorously with water, releasing hydrogen
3) This element is a highly un-reactive gas
4) This element reacts with water to form an ion of +2 charge

Answers for questions 7-12