All practice questions

In 1912, Austrian physicist Victor Hess ascended in a balloon to measure radiation levels at high altitudes, expecting them to decrease. Instead, he discovered that ionizing radiation actually increased with altitude. Hess proved that radiation did not emanate from the Earth itself, which was a hypothesis that had been proposed by earlier scientists, but instead, it came from outer space.

Which choice most effectively and concisely expresses the information in the underlined portion of the sentence?

In 1912, German meteorologist Alfred Wegener proposed the theory of continental drift, but his ideas were initially rejected because he could not explain the mechanism by which the continents actually moved and traveled across the globe. Which of the following choices best replaces the underlined portion of the sentence to make it concise and grammatically correct?

The botanist explained that the rare orchid blooms annually once every year, which is a fascinating event to witness.

Which choice most effectively eliminates redundancy in the underlined portion of the sentence?

Passage Excerpt:

For years, scientists believed the ocean floor was a flat, featureless plain. In the 1950s, geologist Marie Tharp began analyzing echo-sounder profiles of the Atlantic Ocean, meticulously plotting depth measurements by hand. Her work revealed a massive, continuous underwater mountain range, now known as the Mid-Atlantic Ridge, which provided crucial evidence for the theory of continental drift. Although her male colleagues initially dismissed her findings as 'girl talk,' Tharp persisted in her research, [underlined portion].

The writer wants to add a phrase in the underlined portion that emphasizes the painstaking and time-consuming nature of Tharp's mapping process. Which choice best accomplishes this goal?

During the construction of the Brooklyn Bridge, workers faced the threat of caisson disease, commonly known as the bends. At that time, doctors currently did not understand that rapidly changing air pressure caused nitrogen bubbles to form in the bloodstream.

Which of the following choices best eliminates the redundancy in the underlined portion of the sentence?

Although she had never painted before, Elena decided to try her hand at watercoloring. She bought a variety of brushes, several tubes of paint, and a pad of textured paper. She then proceeded to paint a picture of a landscape scene that depicted the mountains.

Which choice is the most concise and grammatically correct replacement for the underlined portion?

Saving the Sounds of the Past

[1]
For over a century, the earliest recordings of human speech and musical performances remained trapped on fragile, rapidly decaying media. Early audio cylinders made of soft wax, discs composed of brittle shellac, and delicate tinfoil sheets held the voices of historical figures, poets, and musicians. However, actually playing these historic recordings meant risking their permanent destruction. The physical contact of a playback stylus, or needle, would inevitably scrape away the microscopic grooves etched into the surface, eroding the precious sound waves with every single listen. For decades, archivists faced a frustrating paradox: to hear the past, they had to destroy it.

[2]
To solve this problem, physicist Carl Haber developed a revolutionary non-contact method using high-resolution digital imaging. By scanning the surfaces of these delicate media, Haber’s system—known as IRENE—creates a detailed, ultra-high-resolution three-dimensional map of the grooves. Software then analyzes this visual map and reconstructs the audio, bypassing the need for any physical contact with the fragile object. _________

[3]
Through this technology, researchers have successfully restored recordings once deemed completely unplayable. For example, a tinfoil recording of inventor Alexander Graham Bell's voice from 1885, previously far too damaged to touch, was played back clearly for the first time in over a century. The voices of the past are no longer silent, thanks to this innovative intersection of particle physics, digital imaging, and historical sound preservation.

The writer wants to add a sentence at the end of Paragraph 2 (after the sentence ending in 'fragile object') to conclude the paragraph and transition to the next paragraph. Which of the following sentences best accomplishes this goal?

Passage

In the damp forests of Brazil, a certain species of bioluminescent mushroom glows with a bright green light that is visible from several yards away. Researchers initially assumed that this constant glow was merely an accidental byproduct of metabolic activity. Instead, a recent study revealed that the mushroom regulates its glow using an internal clock, conserving energy by shining brightest at night to attract spore-dispersing beetles.

Which choice most logically transitions from the researchers' initial assumption to the findings of the recent study?

The following passage is about the whistled language of the Canary Islands.

For centuries, the inhabitants of La Gomera, a rugged volcanic island in the Canary Islands, have used a unique whistled language called Silbo Gomero to communicate across deep ravines and narrow valleys. [1] This whistled speech, which mimics the Spanish language's vowels and consonants with high- and low-pitched whistles, allows messages to travel up to five kilometers. In the late twentieth century, however, the rapid expansion of modern telecommunications and roads threatened to make the language obsolete.

The writer wants to add a sentence at Point [1] that highlights the physical demands and skill required to perform Silbo Gomero. Which choice best achieves this goal?

In 132 CE, the Chinese polymath Zhang Heng presented the imperial court with a vessel designed to register earthquakes from afar. Due to the fact of the device's interior mechanism, which utilized a central pendulum that was suspended and hanging inside, it could detect the direction of a distant tremor. This invention allowed officials to dispatch aid to affected provinces immediately, long before messengers could arrive on foot.

Which choice is the most concise and grammatically correct version of the underlined portion of the sentence?

The following is a passage about the history of the telescope.

[1]
In the early seventeenth century, a spectacle maker named Hans Lippershey filed a patent for a device that could make distant objects appear close. This simple device, consisting of two lenses in a tube, marked the birth of the telescope. Recognizing its potential, the Italian astronomer Galileo Galilei quickly constructed his own version, pointing it toward the night sky. With his telescope, Galileo discovered the four largest moons of Jupiter and observed the phases of Venus, forever altering our understanding of the universe.

[2]
As the centuries progressed, astronomers built increasingly large and complex telescopes. Sir Isaac Newton revolutionized the design by using mirrors instead of glass lenses to focus light, which solved the problem of color distortion. This reflecting telescope layout paved the way for massive modern observatories situated on remote mountaintops, far from the light pollution of cities.

[3]
Today, telescopes are no longer confined to the Earth's surface. In 1990, the Hubble Space Telescope was launched into orbit above the atmosphere, providing humanity with stunningly clear images of distant galaxies. As technology advances, newer instruments like the James Webb Space Telescope continue to push the boundaries of what we can see. ________

Which choice provides the most effective and logical conclusion to the passage?

The following passage contains an underlined portion.

In 1967, astrophysicist Jocelyn Bell Burnell detected a series of anomalous radio signals while analyzing data from a newly constructed radio telescope. These rapid pulses, which recurred every 1.3 seconds, initially baffled researchers who were searching for cosmic sources. The team jokingly dubbed the mysterious source 'Little Green Men 1' before identifying it as a pulsar, a rapidly spinning neutron star.

Which choice best punctuates the underlined portion of the passage?

In 1945, self-taught engineer Percy Spencer was working on active radar sets at the Raytheon corporation. While standing near an operating magnetron, he noticed that a chocolate bar in his pocket had begun to melt. Due to the fact that he was curious and interested in finding out why this happened, Spencer decided to test other foods, including popcorn kernels, which quickly became the world's first microwaved popcorn.

Which choice is the most concise and grammatically correct option for the underlined segment?

During a winter trip to New York City in $1903$, Mary Anderson noticed that the motorman of a streetcar had to keep the front window open to wipe sleet off the glass. This practice made the driver cold and exposed the passengers to the freezing elements. For instance, she returned to her home in Alabama and designed a hand-operated squeegee that could be controlled from inside the vehicle.

Which choice provides the most logical transition between the two sentences?

Marie Tharp was an American geologist and oceanographic cartographer who, in partnership with Bruce Heezen, created the first scientific map of the entire ocean floor. During the 1950s, much of the ocean floor remained a mystery—a vast, unexplored expanse hidden beneath miles of water—which challenged prevailing geological theories. Tharp's work revealed the presence of the Mid-Atlantic Ridge, a discovery that proved essential to the development of the theory of plate tectonics.

Which of the following choices best punctuates the underlined portion of the sentence?

The standard model of particle physics has long been regarded to be the most robust framework for describing the fundamental forces of nature. Which of the following choices best replaces the underlined portion of the sentence?

Anthropologists studying fossilized remains are often able to reconstruct the diets of early human ancestors. By analyzing tooth enamel, researchers search for specific chemical signatures, they are carbon isotope ratios that reveal what types of vegetation were consumed in the region.

Which of the following choices for the underlined portion is grammatically correct?

To create the illusion of depth in his portraits, Leonardo da Vinci employed the *sfumato* technique. This was a method that blends tones and colors together so gradually that they merge imperceptibly without any perceptible lines.

Which option is the most concise and grammatically correct replacement for the underlined portion of the passage?

In 1948, graduate student Bernard Silver overheard a grocery store executive asking for a system that could automatically record product information at checkout. Silver shared this request with his friend Norman Joseph Woodland. Woodland, who was completely fascinated and also deeply intrigued by the request, subsequently decided that he would move to Florida in order to focus on developing a solution.

Which of the following is the most effective and concise choice for the underlined portion of the sentence?

Although the treaty was signed in secret, the details were soon leaked to the press. This public disclosure, which made the confidential information known to the general populace, sparked widespread protests across the nation.

Which choice most effectively replaces the underlined portion of the sentence to eliminate unnecessary redundancy while maintaining grammatical correctness?