The standard shipping container mattered chiefly because it did what?

Let cargo pass between ship, train and lorry without being unpacked

Made ships travel appreciably faster

Reduced the weight of the cargo carried

Removed the need for deep-water ports

A printed barcode is read by doing what?

Measuring light reflected from bars of differing width

Detecting a magnetic strip beneath the ink

Sensing a small radio chip inside the label

Photographing the printed digits and reading them

The ballpoint pen solved which problem of the fountain pen?

A body too heavy to hold comfortably

Nibs that wore out within weeks

A need for specially coated paper

The zip fastener took decades to catch on largely because of what?

Early versions jammed and pulled apart

The metal it used was prohibitively expensive

It could not be sewn into cloth

Elisha Otis's public demonstration in 1854 proved what about lifts?

That a safety brake would catch the platform if the rope was cut

That a lift could be driven by electricity

That a lift could carry more than a tonne

That a lift needed no machine room above it

Canning food in sealed containers was developed first for what purpose?

Feeding armies and navies away from supply

Exporting fruit between continents

Supplying hospitals with sterile food

The S-bend or U-bend in a drain works by doing what?

Holding a plug of water that blocks sewer gas

Slowing the flow so the pipe does not burst

Filtering solids out of the waste

The sewing machine worked once the needle had its eye placed where?

At the blunt end, as in hand sewing

In a separate carrier behind the needle

A vacuum flask keeps liquids hot mainly by doing what?

Removing the air between two walls so heat cannot conduct across

Sealing the lid with a thick rubber gasket

Surrounding the contents with plastic foam

Reflecting heat with a dark coating

Inventions & Engineering Medium ⚡ 10 Questions ⏱️ ~7 Mins +100 XP

Small Inventions, Large Consequences

None of these were glamorous. Several reshaped whole industries, and one of them made tall buildings possible.

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The inventions that change most are rarely the ones that look impressive. A steel box with standard corner fittings did more to reshape world trade than any ship design, because it removed the labour of unpacking and repacking cargo at every stage of a journey. A water-filled bend in a drainpipe did more for urban health than most nineteenth-century medicine. What these ten have in common is that each removed a bottleneck nobody had identified as one. The explanations give the date and, where it is interesting, the reason for the delay: several of these ideas existed for decades before a version arrived that actually worked in daily use.

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Small Inventions, Large Consequences: all 10 questions and answers

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1The standard shipping container mattered chiefly because it did what?
- A Removed the need for deep-water ports
- B Let cargo pass between ship, train and lorry without being unpacked Correct
- C Made ships travel appreciably faster
- D Reduced the weight of the cargo carried
Answer: B. Let cargo pass between ship, train and lorry without being unpacked

Why: Malcom McLean ran a trucking firm and converted a tanker to carry loaded trailers in 1956. Loading costs fell so far that it became sensible to split manufacturing across continents.
2A printed barcode is read by doing what?
- A Measuring light reflected from bars of differing width Correct
- B Detecting a magnetic strip beneath the ink
- C Sensing a small radio chip inside the label
- D Photographing the printed digits and reading them
Answer: A. Measuring light reflected from bars of differing width

Why: The first commercial scan, in 1974, was on a packet of chewing gum. The number identifies the product only; the price lives in the shop's own database.
3The ballpoint pen solved which problem of the fountain pen?
- A A body too heavy to hold comfortably
- B Nibs that wore out within weeks
- C A need for specially coated paper
- D Ink that leaked and smudged Correct
Answer: D. Ink that leaked and smudged

Why: Laszlo Biro, a newspaper editor, noticed that printing ink dried far faster than writing ink. Thicker ink needed a rolling ball to feed it onto the page at all.
4The zip fastener took decades to catch on largely because of what?
- A It could not be sewn into cloth
- B A government held the patent
- C Early versions jammed and pulled apart Correct
- D The metal it used was prohibitively expensive
Answer: C. Early versions jammed and pulled apart

Why: A reliable design arrived in 1913, and the name "zipper" came from a boot company in 1923. Clothing designers only adopted it properly in the 1930s.
5Elisha Otis's public demonstration in 1854 proved what about lifts?
- A That a lift needed no machine room above it
- B That a safety brake would catch the platform if the rope was cut Correct
- C That a lift could be driven by electricity
- D That a lift could carry more than a tonne
Answer: B. That a safety brake would catch the platform if the rope was cut

Why: He had the rope cut while standing on the platform at a New York exhibition. Passenger lifts, and so tall buildings, depended on persuading people they were survivable.
6Canning food in sealed containers was developed first for what purpose?
- A Feeding armies and navies away from supply Correct
- B Exporting fruit between continents
- C Storing grain against famine
- D Supplying hospitals with sterile food
Answer: A. Feeding armies and navies away from supply

Why: The French government offered a prize, which Nicolas Appert won in 1810 using sealed glass jars. The tin can appeared the same year, decades ahead of any decent opener.
7The S-bend or U-bend in a drain works by doing what?
- A Slowing the flow so the pipe does not burst
- B Filtering solids out of the waste
- C Separating hot water from cold
- D Holding a plug of water that blocks sewer gas Correct
Answer: D. Holding a plug of water that blocks sewer gas

Why: Alexander Cumming patented it in 1775. It is among the cheapest public health devices ever designed and the shape has barely changed since.
8Air conditioning was first installed in order to control what?
- A Heat on a hospital ward
- B Dust in a textile mill
- C Humidity in a printing plant Correct
- D Temperature in a cinema
Answer: C. Humidity in a printing plant

Why: Willis Carrier's 1902 system was meant to stop paper swelling and colour printing going out of register. Cooling for human comfort came later, and cinemas were among the first buildings to advertise it.
9The sewing machine worked once the needle had its eye placed where?
- A In a separate carrier behind the needle
- B At the point Correct
- C At the blunt end, as in hand sewing
- D Halfway along the shaft
Answer: B. At the point

Why: Putting the eye at the tip let a second thread lock the stitch from underneath. Elias Howe patented a version in 1846 and spent years in court against Isaac Singer.
10A vacuum flask keeps liquids hot mainly by doing what?
- A Removing the air between two walls so heat cannot conduct across Correct
- B Sealing the lid with a thick rubber gasket
- C Surrounding the contents with plastic foam
- D Reflecting heat with a dark coating
Answer: A. Removing the air between two walls so heat cannot conduct across

Why: James Dewar built it in 1892 to hold liquefied gases, not tea. The silvered surface deals with radiation while the vacuum handles conduction and convection.

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Small Inventions, Large Consequences has 10 questions and takes about 7 minutes to finish. It is rated Medium and sits in our Inventions & Engineering category.

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Yes. All 10 questions carry a written explanation of why the correct answer is right, so the quiz works as a study sheet as well as a test.

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Small Inventions, Large Consequences

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Small Inventions, Large Consequences: all 10 questions and answers

1The standard shipping container mattered chiefly because it did what?

2A printed barcode is read by doing what?

3The ballpoint pen solved which problem of the fountain pen?

4The zip fastener took decades to catch on largely because of what?

5Elisha Otis's public demonstration in 1854 proved what about lifts?

6Canning food in sealed containers was developed first for what purpose?

7The S-bend or U-bend in a drain works by doing what?

8Air conditioning was first installed in order to control what?

9The sewing machine worked once the needle had its eye placed where?

10A vacuum flask keeps liquids hot mainly by doing what?

Frequently asked questions about Small Inventions, Large Consequences

How many questions are in Small Inventions, Large Consequences?

How is Small Inventions, Large Consequences scored?

Are the answers to Small Inventions, Large Consequences explained?

Can I replay Small Inventions, Large Consequences?

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