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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Science | 36.8% | - Health Concepts
|
| Topic 2: Verbal Ability | 35.6% | - Word Knowledge
|
| Topic 3: Mathematics | 27.6% | - Algebra
|
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NEW QUESTION # 104
Milk, pure water, lemon juice, and gastric juice were tested using a pH meter. Results are summarized in the chart below.
Substance | pH
Milk | 6.8
Pure water | 7
Lemon juice | 2
Gastric juice | 1
Which substance is the most acidic?
Answer: D
Explanation:
The pH scale measures acidity and alkalinity, ranging from 0 to 14. Lower pH values indicate higher acidity, while higher pH values indicate greater alkalinity. A pH of 7 is considered neutral. In the chart provided, gastric juice has a pH of 1, which is the lowest value listed, making it the most acidic substance. Lemon juice, with a pH of 2, is also acidic but less so than gastric juice. Milk is slightly acidic, and pure water is neutral.
Gastric juice contains hydrochloric acid, which aids digestion and destroys harmful microorganisms in the stomach. The NEX Science exam frequently tests understanding of the pH scale and its physiological relevance, particularly in digestive processes.
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NEW QUESTION # 105
You are staining bacterial samples for identification and viewing them under a microscope.
Which bacterial shape do you observe in the sample?
Answer: D
Explanation:
This question tests knowledge of bacterial morphology, which is commonly assessed on the NEX Science exam. Bacteria are often classified based on their shape, which helps in identification and diagnosis. The image shows elongated, rod-shaped bacteria. This shape is characteristic ofbacilli. Bacilli are cylindrical or rod-like and are commonly found in many bacterial species, includingEscherichia coliandBacillus anthracis.
Cocci are spherical in shape, spirochetes are long and spiral-shaped, and vibrios have a curved, comma-like appearance. None of these shapes match the straight rod-like structures shown in the image. Identifying bacterial shape is an important first step in microbiology before further tests such as Gram staining or biochemical analysis are performed. The NEX exam frequently uses images or descriptions to assess whether students can correctly distinguish between cocci, bacilli, spirilla/spirochetes, and vibrios based on visual characteristics. Recognizing bacilli as rod-shaped bacteria is a key foundational concept.
NEW QUESTION # 106
Review the table of undisturbed sedimentary rock strata below.
According to the table, which of these fossils is the oldest?
Answer: A
Explanation:
This question tests understanding of the law of superposition, a fundamental principle in geology that is frequently tested on the NEX Science exam. The law of superposition states that in undisturbed sedimentary rock layers, the oldest layers are found at the bottom, while the youngest layers are found at the top. In the table shown, the soil surface is at the top, followed by Fossil D, Fossil C, Fossil B, and Fossil A at the bottom.
Because Fossil A is located in the lowest rock layer, it must be the oldest fossil. Fossils found in higher layers were deposited more recently. The key word in the question is "undisturbed," which means the layers have not been mixed or overturned by geological processes. The NEX exam often emphasizes recognizing this clue to correctly apply the law of superposition. Therefore, Fossil A is the correct answer because it represents the earliest life form preserved in the rock strata.
NEW QUESTION # 107
A car travels 15.6 miles on
3
4
4
3
of a gallon of gas. How many miles can the car travel on 5 gallons of gas?
Answer: B
Explanation:
This is a rate and proportion problem. First, determine how many miles the car travels per gallon. Since the car travels 15.6 miles on
3
4
4
3
of a gallon, divide: 15.6 ÷ 0.75 = 20.8 miles per gallon. Next, multiply this rate by the total number of gallons:
20.8 × 5 = 104 miles. Therefore, option C is correct. Option A represents miles per gallon, not total distance.
Option B is a partial multiplication error. Option D results from multiplying before finding the correct rate.
NEX questions frequently assess whether students can correctly identify unit rates before scaling up.
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NEW QUESTION # 108
Reading Comprehension
Passage:
Sleep plays a critical role in memory consolidation. During certain stages of sleep, the brain processes and stores information learned throughout the day. Lack of sleep has been linked to impaired judgment, slower reaction times, and decreased academic performance.
Which conclusion is best supported by the passage?
Answer: A
Explanation:
The correct answer must be directly supported by the information in the passage. The passage clearly explains that sleep helps the brain process and store information, which is essential for memory consolidation. It also states that lack of sleep negatively affects cognitive abilities such as judgment and reaction time. Therefore, the conclusion that memory formation is affected by sleep is well supported. Option A is incorrect because the passage emphasizes mental and cognitive effects, not just physical health. Option C is directly contradicted by the passage's mention of impaired functioning due to lack of sleep. Option D exaggerates the information; while sleep affects academic performance, the passage does not claim it is the sole factor. On the NEX exam, supported-conclusion questions require selecting an answer that is neither too extreme nor unsupported by the passage.
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NEW QUESTION # 109
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