Sheet glass manufacture: the float process- Reading Answers Explanations- CAM Test

Sheet glass manufacture: the float process- Reading Answers Explanations- CAM Test

Here are explanations of the Questions of passage named ‘Sheet glass manufacture: the float process’ which is from the Cambridge IELTS Reading Test Papers. The Questions that have been asked are ‘Table completion’ and ‘True, False, Not Given’. You will find the locations of the Reading Answers, Keywords (highlighted and underlined) and justifications.

Questions 15-22

Complete the table and diagram below.

Choose NO MORE THAN TWO WORDS from the passage for each answer.

Write your answers in boxes 15-22 on your answer sheet.

Early methods of producing flat glass

Method Advantages Disadvantages
15…………………… • Glass remained

16 ……………………

• Slow

• 17 ……………………

Ribbon • Could produce glass sheets

of varying 18…………..

Non-stop process

• Glass was 19………….

20% of glass rubbed away

Machines were expensive

Answer – 15

Location – Paragraph A, 4th Line.

Explanation- Well, if we look at the Question precisely, we come to know that the answer of the 15th question must be ‘a name of the Method’ as it ‘ribbon’ is also the name of the method and both of them are written under the column ‘method’. Keywords around are ‘Glass’ remained which is the advantage of the method and ‘slow’ which is the disadvantage of the method. With the help of the both keywords, the location of the answer is found to be in the Paragraph A. ‘The first successful method for making clear, flat glass involved Spinning, so here it is conspicuous that spinning is a method.’, is the exact line and thus the answer is ‘Spinning’.

Answer- Spinning

Answer- 16

Location – Paragraph A, 2nd line.

Explanation- As, the method is ‘spinning, and the 16th Blanks requires us to find another advantage of the method, though one advantage is given. ‘Glass remained’ is the keyword. The location of it takes us to the A paragraph. The exact lines are ‘the method was very effective as the glass had not touched any surfaces between being soft and becoming hard, so .it stayed perfectly unblemished’. So, the answer is clear because staying unblemished is sort of advantage which our question requires.

Answer- Unblemished perfectly

Answer – 17

Location- Paragraph A, last line.

Explanation- This Question requires us to find another disadvantage which is missing in the question. One disadvantage is there which is ‘Slow’ and that can be taken as keyword to find the location of the answer that we are seeking. Thus, at the end of first paragraph, it can be seen from the line as ‘the process took a long time and was labor intensive’.  Thus, the answer is labor intensive.

Answer- Labor intensive

Answer 18-


Location- B Paragraph, 3rd line

Explanation- As we are to find another advantage of the method which is ‘Ribbon’, that helps us to clear the perspective of the Question. ‘Ribbon’ is the keyword which helps us to locate the answer in the B paragraph. The exact lines are, ’this allowed glass of virtually any thickness to be made non-stop, so the answer is given in a very simple way’. Hence, the answer is Thickness.

Answer- Thickness

Answer- 19

Location – B paragraph, last 3rd line.

Explanation- Since, the question demands from us another disadvantage of the method ‘Ribbon’, it again takes us back to the B Paragraph. ‘Ribbon, Machines, 20%’ are the keywords which help us to weed out the answer. The exact line where the answer is, ‘the rollers would leave both sides of the glass marked’.

Answer- Marked

Answer 20 and 21

Location- D Paragraph 2nd line.

Explanation- Glancing at the diagram precisely, it can be observed that something is pouring in, where arrow of the 20th Question is targeting and something is solid, like a bed where the arrow of the 21st Question is marking. Keywords are ‘Plankinton’s Float Process, melting zone and cooling zone’. They help us to locate the answers in the D Paragraph. Exact lines is, ‘when pouring molten glass onto molten tin, the underside of the glass would be perfectly flat’.

Answer- Molten glass and molten tin


Location- D Paragraph 3rd line.

Explanation-The arrow of the 22nd Question is marking at a pair of something that is rolling. This gives us a sheer hint that answers would be ‘rollers’. Still going to the location again to confirm the answer, with help of keywords like ‘melting zone and cooling zone’, it is clear from the 3rd line as it says ‘transported out of the cooling zone by rollers’. so, the answer is rollers.

Answer- rollers

Sheet glass manufacture: the float process- Reading Answers Explanations- CAM Test

Questions 23-27

Do the following statements agree with the information given in Reading Passage 1?

In boxes 23-27 on your answer sheet, write

TRUE if the statement agrees with the information

FALSE if the statement contradicts the information

NOT GIVEN if there is no information on this

23 The metal used in the float process had to have specific properties.

Location– C Paragraph,  last 3rd  line.

Explanation- The statement states that the metal has to be specific to be used in the process. This is exactly the same in the passage as well. The Keywords are ‘Metal, Float process’ The exact lines are ‘the metal had to melt at a temperature less than the hardening point of glass(about 600° c), but could not boil at a temperature below the temperature of the molten glass (about1500 °c). the best metal for the job was tin.’

Answer- TRUE

24 Pilkington invested some of his own money in his float plant.

Location– E Paragraph.

Explanation- Though there has been a reference to the cost of the company involved as ‘ coasting the company 100,000 pound’ but no reference has been made that whether it was Pilkington’s money or not.


25 Pilkington’s first full-scale plant was an instant commercial success.

location – Eth paragraph, 1st line.

Explanation- From initial line, it is very clear (Pilkington built a point plant in 1953 and by 1955 he had convinced his company to build a full- scale point. However, it took 14 months of nonstop production) if it took 14 months then it means that it was not instant success. So the answer is FALSE

Answer- False

26 The process invented by Pilkington has now been improved.

LOCATION- F Paragraph, 1st line.

Explanation- The question states that the process has improved, which is same in the passage as well. The very first line, it can be seen that, ’float plants today makes glass of near optimal quality’. If it today it makes optimal quality of glass, then it is clear to understand, now it has around been improved.

Answer- True

27 Computers are better than humans at detecting faults in glass.

LOCATION – G paragraph, last lines

EXPLANATION- keywords are ‘computers, humans, glass’ which helps us to locate that the answer is in the G paragraph. Detecting is as inspection.  The answer is clear from the lines as ‘inspection technology allows more than 100 million measurements a second to be made across the ribbon, locating flaws the unaided eye would be unable to see. Secondly, it enables computer downstream to steer cutter around flaws. It means naked eye cannot detect such faults in glass as computer. So, the answer is TRUE

Answer- True.

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