All practice questions

The following paragraph is from a historical report about deep-sea exploration.

In January 1960, Swiss oceanographer Jacques Piccard and US Navy Lieutenant Don Walsh boarded the bathyscaphe *Trieste* to attempt a descent to the deepest known point in the world’s oceans. During the historic 1960 expedition, the team of intrepid explorers, despite facing immense physical pressure, monitored the cabin instruments, recorded depth measurements, and observes the marine life outside the window. They eventually reached the ocean floor at nearly 11,000 meters, proving that life could exist in the absolute darkness of the abyss.

Which choice best maintains a consistent and grammatically correct verb tense throughout the paragraph?

While standing near an active radar magnetron, self-taught engineer Percy Spencer noticed that a peanut butter candy bar in his pocket had completely melted. Realizing that electromagnetic waves could cook food, he then went ahead and invented the microwave oven, a device designed to heat food rapidly.

Which of the following choices is the most clear and concise way to write the underlined portion of the passage?

The local library acquired a rare historical manuscript, researchers immediately requested access to study it.

Which choice is the best version of the underlined portion of the sentence?

### The Origin of Earth's Water

Earth is unique among the terrestrial planets in having vast surface oceans of liquid water. Scientists have proposed different models to explain the source of Earth's water.

#### Model 1 (Late Veneer Model)
During the early stage of Earth's formation, the temperature in the inner Solar System was too high for volatile substances like water to condense. As a result, the protoplanet that became Earth formed dry. Approximately $70$ to $100$ million years after Earth's initial accretion, a period of heavy bombardment occurred. Water-rich carbonaceous chondrites (asteroids from the outer asteroid belt) and comets containing high concentrations of ice collided with the cooled Earth. These impactors delivered water, which vaporized upon impact and later condensed to form the oceans. This model suggests that Earth's water is entirely of extraterrestrial origin, arriving after the planet had reached its final size.

#### Model 2 (Endogenous Source Model)
Earth's water was present from the very beginning of the planet's formation. The planetary building blocks, specifically enstatite chondrite-like materials, contained significant amounts of hydrogen and mineral-bound water, even at high inner-system temperatures. As these materials accreted to form the early Earth, the water was trapped deep within the mantle. Over hundreds of millions of years, intense volcanic activity and planetary degassing released this trapped water as steam into the early atmosphere. As the surface cooled, this atmospheric water vapor condensed and fell as rain, filling the ocean basins. In this model, the source of Earth's water is internal and coeval with the formation of the planet itself.

Based on Model 1 and Model 2, which of the following statements best describes how the two models differ regarding the timing of when water became associated with the planetary material that formed Earth?

To protect themselves from predators, pufferfish can inflate their elastic stomachs with water or air. This unique defense mechanism is a special adaptation that allows them to double in size and appear intimidating to potential threats.

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

Passage

During the mid-twentieth century, geologist Marie Tharp worked to map the ocean floor using sonar data. Her detailed maps eventually revealed a massive, continuous rift valley running down the center of the Mid-Atlantic [1] Ridge. Consequently, her male colleagues dismissed her findings, mockingly attributing the rift to a mathematical error in her data.

Question 1
Which of the following choices best replaces the underlined portion marked [1] to establish a logical and grammatically correct transition between the two sentences?

Two scientists discuss the possible causes of the Permian-Triassic extinction event, which occurred approximately 252 million years ago.

Scientist 1
The extinction was caused by the eruption of the Siberian Traps, a massive volcanic province. These eruptions released large quantities of carbon dioxide ($CO_2$) and sulfur dioxide ($SO_2$) into the atmosphere over a period of approximately 100,000 to 200,000 years. The accumulation of these gases led to severe global warming, acid rain, and ocean acidification. This hypothesis predicts that geological evidence will show a gradual decline in biodiversity coinciding with volcanic emissions, with no evidence of high-pressure impact shock waves.

Scientist 2
The extinction was caused by the impact of a large asteroid or comet. The collision instantly ejected massive amounts of dust, pulverized rock, and sulfur into the stratosphere, blocking sunlight and causing rapid global cooling and a shutdown of photosynthesis within days. This event deposited a distinct, thin layer of impact debris containing shocked quartz (grains with microscopic deformation structures from high pressure) and high levels of iridium globally. The extinction of species was sudden and occurred immediately following the impact.

A researcher analyzed rock layers from the Permian-Triassic boundary and found a 150,000-year-long fossil record showing a progressive decline in marine organisms, accompanied by a steady increase in soil acidity indicators. No shocked quartz or iridium anomalies were detected in any of the layers. This finding is most consistent with the viewpoint of which scientist?

The following sentences are from a paragraph about William Henry Perkin's accidental invention. Arrange the sentences in the most logical order to create a cohesive paragraph that begins with a clear introduction and ends with a strong concluding sentence.

### Origin of the Ancient Lunar Magnetic Field

Although the Moon currently lacks a global magnetic field, analysis of lunar rock samples returned by the Apollo missions indicates that a strong magnetic field existed on the Moon between $4.25$ and $3.56$ billion years ago. Two scientists discuss the potential mechanisms that generated this ancient lunar dynamo.

Scientist 1
The ancient lunar dynamo was driven by thermal convection within the Moon's liquid metallic core. Early in the Moon's history, the core was extremely hot and surrounded by a cooler mantle. This steep temperature gradient caused heat to flow rapidly outward, creating buoyant plumes of hot, liquid iron that rose through the outer core while cooler liquid sank. This thermal convection, combined with the Moon's rotation, generated a global magnetic field. The dynamo ceased approximately $3.5$ billion years ago because the core cooled to a point where the temperature gradient was too low to sustain convection, and the outer core began to solidify.

Scientist 2
The Moon's core is too small to have sustained a thermal convection dynamo. Instead, the dynamo was driven by precession-induced mechanical stirring. Billions of years ago, the Moon was much closer to Earth, and Earth's gravitational tidal forces exerted a powerful torque on the Moon's mantle. This torque caused the mantle to rotate along a slightly different axis than the liquid core (precession). The friction and velocity difference at the boundary between the wobbling mantle and the liquid core mechanically stirred the liquid iron. This mechanical motion, rather than thermal convection, powered the dynamo. The magnetic field shut down as the Moon drifted further from Earth, weakening the gravitational torque and ending the precession-induced stirring.

Based on the passage, Scientist 2 claims that the ancient lunar dynamo was powered by which of the following processes?

Read the passage below:

Deep within the archives of the museum, a team of conservators works tirelessly to protect ancient artifacts. The preservation of these fragile silk scrolls, which requires a highly stable climate-controlled environment, demand meticulous attention to detail. Every fluctuation in humidity could cause irreparable damage.

Which of the following choices represents the correct form of the underlined word to maintain grammatical agreement in the sentence?

The following passage contains an underlined portion:

In the deep ocean, hydrothermal vents support unique ecosystems that thrive without sunlight. Organisms such as giant tube worms and ghost crabs rely on chemosynthesis for energy, consequently, the discovery of these vents in 1977 transformed our understanding of biology and the limits of life on Earth. Before this finding, scientists believed that all ecosystems ultimately depended on solar radiation. Now, researchers explore these abyssal zones to search for clues about early life.

Which of the following options best corrects the underlined portion of the passage?

Based on the grammatical rules of comparison, which words should fill the blanks in the sentence below to make it grammatically correct?

The passage below is about computer pioneer Grace Hopper. Read the passage and determine the correct form of the verb 'reduce' to fill in the blank so that the paragraph maintains consistent verb tense. What is the correct form of the verb?

To ensure that the introductory phrase 'Hoping to capture a rare glimpse of the elusive snow leopard' correctly modifies the logical subject of the sentence, fill in the blank with a logical subject noun phrase (such as 'the photographer' or 'the researcher').

The marine biologist spent three weeks exploring the remote coral reef, and she documented several new species of colorful fish.

Which choice best punctuates the underlined portion of the sentence?

Deep in the temperate rainforests, bioluminescent fungi emit a soft green glow that illuminates the forest floor at night. Researchers believe that this light attracts insects, which then spread the fungal spores throughout the ecosystem. While studying these organisms, scientists documented the chemical reactions that caused the glow and analyze how different temperatures affected the brightness.

Which choice most effectively maintains a consistent grammatical structure and verb tense throughout the final sentence?

A portion of the passage below is underlined.

In 1961, a group of programmers at MIT set out to create a demonstration program for a newly acquired computer. They decided to build an interactive game, which would eventually be named *Spacewar!*. Over several months, they spent hours writing code, aiming to design a simulation that was realistic. In order to achieve a high degree of realistic simulation that was very true to life, they programmed accurate gravitational pull and star fields.

Which of the following choices is the best replacement for the underlined portion of the sentence?

Many architectural conservators argue that while modern synthetic sealants offer immediate protection against moisture, their chemical composition is ultimately not conducive with the long-term preservation of historic sandstone.

Which choice is the most grammatically and idiomatically correct replacement for the underlined portion of the sentence?

During the mid-twentieth century, jazz musicians from different backgrounds would frequently collaborate together with one another. They wanted to create new musical styles.

Which of the following is the best choice for the underlined portion of the sentence?

During the town's annual heritage festival, visitors flocked to see the newly restored landmark. Although the restoration of the historic theater took several years; the dedicated passionate, volunteers completed the project in time for the centennial celebration.

Which of the following options correctly punctuates the underlined portion of the sentence?