Sheet Glass Manufacture: The Float Process Questions and Answers for IELTS

Did you know? The True/False/Not Given question type used in this passage is considered one of the trickiest in IELTS Reading, often misleading test-takers with subtle word choices.

The passage titled “Sheet Glass Manufacture: The Float Process” is part of Cambridge IELTS 8, Academic Reading Test 1, a widely used resource for IELTS preparation. It focuses on the evolution of sheet glass production, particularly the adoption of the float process, an innovation that now accounts for about 90% of global flat glass production.

This IELTS reading text is factual and technical, making it ideal for assessing a candidate’s ability to handle process-based descriptions and scientific vocabulary. Common question types include Table Completion, True/False/Not Given, and Sentence Completion.

Understanding this passage helps improve both reading accuracy and test strategy. In this guide, you will find a summary of the passage, the question formats it includes, sample answers with explanations, and useful tips to help you prepare effectively for this section of the IELTS Academic exam.

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Overview of the Sheet Glass Manufacture IELTS Reading Passage

The passage titled “Sheet Glass Manufacture: The Float Process” is a factual, process-based text featured in Cambridge IELTS 8, Academic Reading Test 1. It describes how the float process improved flat glass production by replacing older, less efficient methods like grinding and polishing.

This passage is used in the IELTS exam to assess your ability to follow a chronological process, understand technical language, and interpret cause-and-effect relationships. Its structure makes it ideal for evaluating your performance across several common IELTS reading question types.

Key Highlights: 

IELTS Focus Area	Details
Passage Type	Factual, process-based
Reading Skills Tested	Skimming, scanning, detail matching, and paraphrasing
Common Question Types	Table Completion, True/False/Not Given, Sentence Completion
Vocabulary Challenge	Technical terms: molten, unblemished, rollers, float, tin bath
Tip for Test Takers	Read the questions first to guide skimming, and look for process signals

Check out: IELTS Reading Band Score Guide

Sample Answer Key: Sheet Glass Manufacture IELTS Reading Passage

Below is a sample version of the IELTS Academic Reading passage titled “Sheet Glass Manufacture: The Float Process”, which reflects the IELTS test format, followed by typical IELTS question types and their corresponding answers with explanations.  

Passage: Sheet Glass Manufacture: The Float Process (Excerpt)

Until the 1950s, most flat glass was produced using a method that involved rolling the glass into sheets and then grinding and polishing them to improve transparency. This process was time-consuming and expensive.

In the 1950s, Pilkington Brothers in the UK developed the float process, a method by which molten glass is poured onto a bath of molten tin. The glass spreads out, floats on the tin, and forms a flat surface under the influence of gravity and surface tension. The result is a smooth, even sheet of glass without the need for grinding or polishing.

The float process was a breakthrough, and today, it produces about 90% of the world’s flat glass. Key benefits include continuous production, controlled thickness, and high optical quality. Glass moves through the float bath and into an annealing lehr, where it is gradually cooled. Modern inspection technology ensures the finished glass is free from defects.

IELTS Reading Questions

Questions 1–6: Table Completion

Complete the table below.

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

Stage	Process or Description
Early production method	Used (1)_________ and polishing
Limitations of the early method	Required manual finishing
Float process	Uses (2)_________ to shape glass
Production type	(3)_________ manufacturing process
Control element in the float process	Managed using (4)_________
Final inspection	Done using (5)_________

Questions 6–9: True / False / Not Given

Do the following statements agree with the information in the passage?

Write: TRUE / FALSE / NOT GIVEN

1. The float process was introduced in the 1940s.
2. Pilkington’s process eliminated the need for polishing.
3. All flat glass manufacturers use the float process today.
4. The float process produces less optical-quality glass than earlier methods.

Questions 10–12: Sentence Completion

Complete the sentences below.

Choose NO MORE THAN TWO WORDS from the passage.

1. In the float process, glass is floated on a bath of _________.
2. Glass is shaped by gravity and _________.
3. Final cooling takes place in an _________.

Detailed Answer Key with Explanations

Questions 1–5: Table Completion

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

Question	Answer	Explanation
1	grinding	The passage states that early methods required “rolling the glass into sheets and then grinding and polishing them”.
2	molten tin	The float process uses molten tin to form the glass shape: “molten glass is poured onto a bath of molten tin.”
3	continuous	The passage describes the float process as a “continuous production method.”
4	thickness	It states that “controlled thickness” is one benefit of the float process.
5	inspection technology	The final inspection is done using modern inspection technology.

Questions 6–9: True / False / Not Given

Instructions: Do the statements agree with the information in the passage?

Question	Answer	Explanation
6	FALSE	The passage clearly says the float process was developed in the 1950s, not the 1940s.
7	TRUE	It states the float process produces glass with a smooth finish “without the need for grinding or polishing.”
8	NOT GIVEN	Although it mentions that float glass makes up “about 90%” of flat glass production, it never says all manufacturers use it.
9	FALSE	The float process improved quality, not reduced it: “high optical quality” is listed as one of its advantages.

Questions 10–12: Sentence Completion

Instructions: Choose NO MORE THAN TWO WORDS from the passage.

Question	Answer	Explanation
10	molten tin	The passage mentions “molten glass is poured onto a bath of molten tin.”
11	surface tension	The text states that shaping occurs “under the influence of gravity and surface tension.”
12	annealing lehr	Final cooling happens in the “annealing lehr, where it is gradually cooled.”

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Common IELTS Reading Question Types in the Float Process Passage

The Sheet Glass Manufacture: The Float Process passage typically includes question types that assess your ability to identify factual information, understand specific details, and interpret paraphrased content. Below are the common question types used in this passage:

1. Table Completion

This task tests your skill in locating key information and placing it correctly into a structured table. Answers are often short phrases or nouns taken directly from the passage.
Tip: Look for paraphrased information in the passage and pay attention to word limits.

2. True / False / Not Given

These questions require you to determine whether the statement:

• Matches the passage (True)
• Contradicts the passage (False)
• It is not mentioned at all (Not Given)

3. Sentence Completion

You are asked to complete a sentence using specific words from the text. This type tests your vocabulary and grammar recognition.
Tip: Ensure your answer fits grammatically and stays within the given word limit.

Also check out: IELTS Reading Test: How to Prepare for IELTS Reading Section?

 

How to Answer Sheet Glass Float Process Questions in IELTS Reading

Understanding how to approach IELTS Reading passages like Sheet Glass Manufacture: The Float Process can help you save time and improve accuracy. Here are targeted strategies to answer these question types effectively:

1. Skim the Passage First

Start by quickly reading the passage to understand the overall topic and structure. Focus on keywords like “float process,” “molten tin,” and “inspection” to identify the key stages of the manufacturing process.

2. Identify Keywords in the Questions

Underline or note important terms in the question prompt. For example, in table completion, pay attention to terms like material, process, or technology; these are often paraphrased in the passage.

3. Use the Passage Chronology

Since process-based texts follow a logical order, the answers usually appear in sequence. This helps you locate information without re-reading the entire passage multiple times.

4. Be Careful with True/False/Not Given

For these, avoid assuming based on your knowledge. Base your answer strictly on what the passage states. If there’s no clear reference, the correct answer may be Not Given.

5. Follow Word Limits Precisely

If the instruction says "No more than two words," do not exceed the limit. Stick to the exact words or phrases from the text, especially in sentence completion and table completion tasks.

6. Practice Vocabulary Recognition

Many questions paraphrase terms. For example, “polishing” might appear as “finishing”, or “controlled thickness” may be described as “uniform dimensions.” Recognizing synonyms is essential.

Tips to Master the Sheet Glass Float Process Passage in IELTS

Tackling scientific or process-based IELTS Reading passages like Sheet Glass Manufacture: The Float Process requires a focused strategy. Below are practical reading tips to improve both speed and accuracy.

1. Focus on Process Flow: Understand the sequence of steps described in the passage. This helps in answering questions related to procedure, stages, or benefits more efficiently. Diagrams or lists in the passage often reflect this order.

2. Scan for Technical Terms: The passage contains key terms such as molten glass, tin bath, and annealing lehr. These words often guide you to relevant parts of the text when answering completion and sentence-based questions.

3. Learn to Paraphrase: IELTS questions rarely copy exact sentences from the text. Practice identifying paraphrased versions of phrases like “optical quality” or “continuous process.” This improves your chances of matching questions with the right text.

4. Be Cautious with Assumptions: In True/False/Not Given questions, base your answer only on the passage, not general knowledge. Just because something seems logical doesn’t mean it’s stated in the text.

5. Practice Under Timed Conditions: Allocate around 20 minutes for this passage, including reading, scanning, and answering all questions. Timed practice helps simulate real test conditions and improves time management.

6. Use the Instruction Format Strictly: If the instruction says “No more than two words,” writing three words, even if correct, will be marked wrong. Read all instructions carefully.

Conclusion

The Sheet Glass Manufacture: The Float Process passage is a common feature in IELTS Reading, especially in the Academic module. By understanding the passage structure, familiarising yourself with key vocabulary, and practising specific question types like table completion and True/False/Not Given, you can significantly boost your performance.

Use the strategies discussed in this guide to approach such technical texts confidently and improve both speed and accuracy. With consistent practice, even dense scientific passages like this one become manageable and score-friendly.

Ready to experience a smarter, more personalized way to prepare? Schedule a free 1:1 counselling session with upGrad experts and increase your confidence and score.