EmSAT Achieve Exam — Questions and Answers

Question 1: Which data structure follows the Last-In, First-Out (LIFO) principle?

Queue
Binary Tree
Stack (Correct answer)
Linked List

Correct answer: Stack

A stack operates on the LIFO principle — the last element pushed onto the stack is the first one to be popped off. A queue uses FIFO (First-In, First-Out) instead.

Question 2: What does Archimedes' principle state?

Pressure increases with depth linearly
An object floats if its density is greater than the fluid
Fluids exert equal pressure in all directions
The buoyant force equals the weight of fluid displaced (Correct answer)

Correct answer: The buoyant force equals the weight of fluid displaced

Archimedes' principle states that the buoyant force on an object equals the weight of the fluid displaced by that object. This explains why objects float or sink.

Question 3: Which rhetorical device is used in the phrase 'أسدٌ يحمي الوطن' (A lion protects the homeland)?

Metaphor (استعارة) (Correct answer)
Simile (تشبيه)
Metonymy (كناية)
Hyperbole (مبالغة)

Correct answer: Metaphor (استعارة)

This is a metaphor (استعارة) because a person is directly described as a lion without using a comparison particle.

Question 4: If f(x) = 3x² − 2x + 1, what is f(−2)?

9
13
17 (Correct answer)
−3

Correct answer: 17

f(−2) = 3(4) − 2(−2) + 1 = 12 + 4 + 1 = 17.

Question 5: What is the SI unit of electrical resistance?

Ohm (Correct answer)
Ampere
Volt
Watt

Correct answer: Ohm

The ohm (Ω) is the SI unit of electrical resistance, named after Georg Simon Ohm. It is defined as the resistance between two points when one volt produces one ampere of current.

Question 6: In Arabic poetry, what is the term for the second hemistich (half) of a poetic line?

العجز (Correct answer)
القافية
الصدر
التفعيلة

Correct answer: العجز

العجز is the second hemistich of a poetic line, while الصدر refers to the first half.

Question 7: Which of the following is a 'حرف جر' (preposition) in Arabic?

ذهابٌ
مِنْ (Correct answer)
الكتابُ
كتبَ

Correct answer: مِنْ

'مِنْ' (from) is a حرف جر (preposition). Prepositions in Arabic govern the genitive case on the following noun. Other prepositions include: إلى، على، في، عن، بـ، لـ، كـ.

Question 8: Which of the following correctly describes the lock-and-key model of enzyme action?

The enzyme changes shape to fit any substrate
Multiple enzymes share a single active site
Only a specific substrate fits the active site of an enzyme (Correct answer)
Enzymes are permanently altered after each reaction

Correct answer: Only a specific substrate fits the active site of an enzyme

The lock-and-key model proposes that only a substrate with a complementary shape can bind to the enzyme's specific active site.

Question 9: In EmSAT Arabic, what is the correct grammatical term for the subject of a verbal sentence (الجملة الفعلية)?

المفعول به
المبتدأ
الفاعل (Correct answer)
الخبر

Correct answer: الفاعل

In a verbal sentence (الجملة الفعلية), the doer of the action is called الفاعل (the subject/agent), which comes after the verb and is in the nominative case (مرفوع).

Question 10: What is translation in protein synthesis?

DNA → RNA
Protein → Amino acids
RNA → Protein (Correct answer)
DNA → Protein directly

Correct answer: RNA → Protein

Translation is the process by which ribosomes read the mRNA sequence and assemble amino acids into a protein, following the genetic code.

Question 11: What type of energy transformation occurs in a solar panel?

Light (radiant) to electrical (Correct answer)
Chemical to kinetic
Nuclear to thermal
Kinetic to thermal

Correct answer: Light (radiant) to electrical

Solar panels (photovoltaic cells) convert light energy (electromagnetic radiation from the sun) into electrical energy through the photovoltaic effect.

Question 12: Identify the subordinate clause in: 'Although it was raining, we went outside.'

went outside
Although it was raining (Correct answer)
we went outside
it was raining

Correct answer: Although it was raining

'Although it was raining' is the subordinate clause — it begins with a subordinating conjunction and cannot stand alone as a complete sentence.

Question 13: Identify the correct use of a semicolon.

I; like coffee and tea.
I like coffee; and tea.
I like coffee; I dislike tea. (Correct answer)
I like; coffee and tea.

Correct answer: I like coffee; I dislike tea.

A semicolon connects two independent clauses that are related in thought. 'I like coffee; I dislike tea' correctly joins two complete sentences.

Question 14: What does the cosine rule state?

c² = a² + b²
c² = a² + b² − 2ab·cos(C) (Correct answer)
sin(A)/a = sin(B)/b
c = a·cos(C)

Correct answer: c² = a² + b² − 2ab·cos(C)

The cosine rule is c² = a² + b² − 2ab·cos(C). It generalizes the Pythagorean theorem to non-right triangles.

Question 15: The equation of a circle with centre (3, −1) and radius 5 is:

(x+3)² + (y+1)² = 25
(x−3)² + (y+1)² = 5
(x+3)² + (y−1)² = 25
(x−3)² + (y+1)² = 25 (Correct answer)

Correct answer: (x−3)² + (y+1)² = 25

Standard form is (x−h)² + (y−k)² = r², giving (x−3)² + (y+1)² = 25.

Question 16: What is the relationship between wavelength and frequency for electromagnetic waves?

They are directly proportional
They are inversely proportional (wavelength × frequency = speed of light) (Correct answer)
There is no relationship
They are equal

Correct answer: They are inversely proportional (wavelength × frequency = speed of light)

For electromagnetic waves, c = λf, where c is the speed of light (constant). As frequency increases, wavelength decreases proportionally, making them inversely proportional.

Question 17: Which word is correctly written with Hamzat al-Qat' (همزة القطع)?

انطلق
اسم
أكل (Correct answer)
ابن

Correct answer: أكل

'أكل' carries همزة القطع because it is the hamza of the verb root itself, always pronounced and written with a hamza mark.

Question 18: What functional group characterizes alcohols?

−OH (Correct answer)
−COOH
−CHO
−NH₂

Correct answer: −OH

Alcohols contain the hydroxyl functional group (−OH) attached to a carbon atom. Examples include ethanol (C₂H₅OH) and methanol (CH₃OH).

Question 19: Which data structure uses LIFO (Last In, First Out) ordering?

Stack (Correct answer)
Binary Tree
Linked List
Queue

Correct answer: Stack

A stack follows LIFO order, meaning the last element added is the first to be removed.

Question 20: What is the molar mass of water (H₂O)?

18 g/mol (Correct answer)
16 g/mol
20 g/mol
14 g/mol

Correct answer: 18 g/mol

Molar mass of H₂O = 2(1) + 16 = 18 g/mol. Hydrogen has a molar mass of 1 g/mol and oxygen has 16 g/mol.

Question 21: What is an ecosystem?

A single population of animals
A community of living organisms interacting with their non-living environment (Correct answer)
The total number of genes in a species
A group of organisms of the same species

Correct answer: A community of living organisms interacting with their non-living environment

An ecosystem consists of all the living organisms (biotic components) in an area, together with the non-living (abiotic) components (such as water, soil, and climate) with which they interact.

Question 22: What is 'الاستعارة' (isti'aara) in Arabic literature?

A type of repetition
A direct quote
A metaphor (implied comparison without like/as) (Correct answer)
A simile using كـ

Correct answer: A metaphor (implied comparison without like/as)

الاستعارة is a metaphor in Arabic rhetoric — an implied comparison where one thing is described as if it actually is another, without using كـ or كأن. It is a more direct and stronger comparison than simile.

Question 23: What is the electron configuration of oxygen (atomic number 8)?

1s² 2s² 2p⁴ (Correct answer)
1s² 2s² 2p⁶
1s² 2s² 2p² 3s²
1s² 2s⁴ 2p²

Correct answer: 1s² 2s² 2p⁴

Oxygen has 8 electrons. The configuration is 1s² 2s² 2p⁴ — 2 in the first shell and 6 in the second shell (2 in 2s and 4 in 2p).

Question 24: What does 'context clues' mean in reading?

Clues found in a dictionary
The title of the passage
The author's biography
Surrounding words and sentences that help define an unfamiliar word (Correct answer)

Correct answer: Surrounding words and sentences that help define an unfamiliar word

Context clues are hints found in the surrounding text that help readers determine the meaning of unfamiliar words without using a dictionary.

Question 25: Two charges of +3 μC and –3 μC are placed 0.3 m apart. The electrostatic force between them is best described as:

Attractive (Correct answer)
Attractive and small
Repulsive and large
Zero, because they cancel

Correct answer: Attractive

Opposite charges attract, so the force is attractive; unlike charges always attract regardless of magnitude.

Question 26: Which sorting algorithm has a best-case time complexity of O(n)?

Bubble Sort (Correct answer)
Quick Sort
Selection Sort
Merge Sort

Correct answer: Bubble Sort

Bubble Sort has a best-case complexity of O(n) when the list is already sorted and no swaps are needed.

Question 27: An object is in free fall. What is its acceleration? (ignore air resistance)

10.8 m/s²
0 m/s²
9.8 m/s² (Correct answer)
5 m/s²

Correct answer: 9.8 m/s²

On Earth, the acceleration due to gravity is approximately 9.8 m/s² downward. All objects in free fall (ignoring air resistance) accelerate at this rate.

Question 28: What is the function of a DNS server?

Translates domain names into IP addresses (Correct answer)
Assigns IP addresses to devices dynamically
Encrypts data transmitted over the internet
Filters web traffic for security

Correct answer: Translates domain names into IP addresses

A DNS (Domain Name System) server translates human-readable domain names into numerical IP addresses.

Question 29: What is the value of log₁₀(1000)?

10
2
4
3 (Correct answer)

Correct answer: 3

log₁₀(1000) = 3 because 10³ = 1000.

Question 30: Choose the word closest in meaning to 'eloquent'.

Silent
Articulate (Correct answer)
Confused
Aggressive

Correct answer: Articulate

'Eloquent' means fluent and persuasive in speech or writing. 'Articulate' is the closest synonym, meaning able to express ideas clearly.

Question 31: Which of the following correctly identifies the type of 'ما' in 'ما أجملَ السماءَ!'?

Relative pronoun (ما الموصولة)
Exclamatory particle (ما التعجبية) (Correct answer)
Negation particle (ما النافية)
Conditional particle (ما الشرطية)

Correct answer: Exclamatory particle (ما التعجبية)

'ما أجملَ' is an exclamatory construction (التعجب) using ما التعجبية followed by a verb in the past tense form.

Question 32: If f(x) = 2x² − 3, what is f(3)?

12
15 (Correct answer)
21
9

Correct answer: 15

f(3) = 2(3)² − 3 = 2(9) − 3 = 18 − 3 = 15.

Question 33: What is 'الفعل الناقص' in Arabic?

A verb with only two letters
A verb with a weak letter (و or ي) as its last root letter (Correct answer)
A defective irregular verb with no pattern
A verb that lacks a past tense

Correct answer: A verb with a weak letter (و or ي) as its last root letter

الفعل الناقص (defective verb) is a verb whose third root letter is a weak letter (و or ي), such as 'دعا' (to call) or 'مشى' (to walk). These verbs undergo spelling changes in conjugation.

Question 34: Choose the correct article: '___ honest man is hard to find.'

An (Correct answer)
A
The
No article

Correct answer: An

'An' is used before words that begin with a vowel sound. Although 'honest' starts with 'h', the 'h' is silent, so it sounds like 'onest' — requiring 'an'.

Question 35: What is the purpose of a compiler in programming?

To translate high-level source code into machine code (Correct answer)
To manage memory allocation
To debug runtime errors automatically
To execute code line by line

Correct answer: To translate high-level source code into machine code

A compiler translates an entire high-level language program into machine code before execution.

Question 36: What does E = mc² represent?

Momentum conservation
Kinetic energy formula
Mass-energy equivalence (Correct answer)
Electric field formula

Correct answer: Mass-energy equivalence

Einstein's famous equation E = mc² expresses mass-energy equivalence: mass (m) can be converted to energy (E), and vice versa. c is the speed of light, making even small masses equivalent to enormous energy.

Question 37: In a persuasive essay, what is a 'counterargument'?

An argument against your position that you then refute (Correct answer)
The conclusion of your essay
A list of evidence
Your strongest argument

Correct answer: An argument against your position that you then refute

A counterargument presents an opposing viewpoint to the writer's position. Acknowledging and refuting it strengthens the overall persuasive essay.

Question 38: Which of the following is the factored form of x² - 9?

(x - 3)²
(x - 9)(x + 1)
(x + 3)(x - 3) (Correct answer)
(x + 9)(x - 1)

Correct answer: (x + 3)(x - 3)

x² - 9 is a difference of two squares: a² - b² = (a + b)(a - b), where a = x and b = 3, giving (x + 3)(x - 3).

Question 39: What is Dalton's Law of Partial Pressures?

Pressure of a gas is inversely proportional to its molar mass
Each gas exerts pressure based on all molecules present
Total pressure of a gas mixture equals the sum of partial pressures of each gas (Correct answer)
Gas pressure depends only on temperature

Correct answer: Total pressure of a gas mixture equals the sum of partial pressures of each gas

Dalton's Law states that the total pressure exerted by a mixture of gases equals the sum of the partial pressures of each individual gas: P_total = P₁ + P₂ + P₃ + ...

Question 40: At what point does f(x) = x² − 4x + 4 have a minimum?

x = 0
x = −2
x = 4
x = 2 (Correct answer)

Correct answer: x = 2

Set f'(x) = 2x − 4 = 0, giving x = 2. Since f''(x) = 2 > 0, this is a minimum.

Question 41: How does vaccination work?

It directly kills viruses
It introduces a weakened/inactivated pathogen to stimulate immune memory without causing disease (Correct answer)
It suppresses the immune system
It kills all bacteria in the body

Correct answer: It introduces a weakened/inactivated pathogen to stimulate immune memory without causing disease

Vaccination introduces a weakened, inactivated, or partial pathogen (or its antigens) into the body, stimulating the immune system to produce antibodies and memory cells without causing the actual disease.

Question 42: What type of reaction is: 2Na + Cl₂ → 2NaCl?

Decomposition
Double replacement
Synthesis (combination) (Correct answer)
Single replacement

Correct answer: Synthesis (combination)

This is a synthesis (combination) reaction where two reactants (sodium and chlorine) combine to form a single product (sodium chloride).

Question 43: What is the discriminant of x² + 4x + 5 = 0?

−4 (Correct answer)
4
36
−36

Correct answer: −4

Discriminant = b² − 4ac = 4² − 4(1)(5) = 16 − 20 = −4. A negative discriminant means no real roots.

Question 44: What does the prefix 'مُـ' on a verb root typically indicate?

Active participle (اسم الفاعل) (Correct answer)
Verbal noun (مصدر)
Past tense
Imperative mood

Correct answer: Active participle (اسم الفاعل)

The prefix مُـ combined with specific vowel patterns forms اسم الفاعل (active participle), e.g., مُكتِب (one who writes).

Question 45: Which sentence contains a dangling modifier?

After finishing the exam, the students left quietly.
Exhausted from the hike, the team rested at the camp.
Running along the beach, she spotted a dolphin.
Having read the instructions, the device was assembled correctly. (Correct answer)

Correct answer: Having read the instructions, the device was assembled correctly.

The phrase 'Having read the instructions' has no logical subject — the device cannot read instructions.

Question 46: In Python, what will print(type(3.14)) output?

<class 'float'> (Correct answer)
<class 'str'>
<class 'double'>
<class 'int'>

Correct answer: <class 'float'>

3.14 is a floating-point number, so Python identifies its type as 'float'.

Question 47: What is the function of ribosomes?

Protein synthesis (Correct answer)
DNA replication
Energy production
Lipid storage

Correct answer: Protein synthesis

Ribosomes are the sites of protein synthesis. They read mRNA sequences and assemble amino acids into proteins following the genetic code.

Question 48: What is the law of reflection?

Light bends toward the normal when entering a denser medium
The angle of incidence equals the angle of reflection (Correct answer)
The angle of incidence equals the angle of refraction
Reflected waves change speed

Correct answer: The angle of incidence equals the angle of reflection

The law of reflection states that the angle of incidence equals the angle of reflection, both measured from the normal to the reflecting surface.

Question 49: If P(A) = 0.4 and P(B) = 0.3 and A and B are independent, what is P(A and B)?

0.1
0.34
0.12 (Correct answer)
0.7

Correct answer: 0.12

For independent events, P(A and B) = P(A) × P(B) = 0.4 × 0.3 = 0.12.

Question 50: A UAE university's IT department assigns the network address 192.168.10.0/24 to a campus lab. How many usable host IP addresses are available on this subnet?

256
255
128
254 (Correct answer)

Correct answer: 254

A /24 subnet contains 2^8 = 256 addresses. Two are reserved: one for the network address (192.168.10.0) and one for the broadcast address (192.168.10.255). That leaves 256 − 2 = 254 usable host addresses.

Question 51: What is the standard deviation a measure of?

Central tendency
The most frequent value
The middle value
Spread or variability in data (Correct answer)

Correct answer: Spread or variability in data

Standard deviation measures the spread or dispersion of data around the mean. A larger standard deviation indicates more variability in the data set.

Question 52: What is the Doppler effect?

Wave energy decreasing with distance
Wave reflection from a surface
Light bending around obstacles
Change in observed frequency due to relative motion (Correct answer)

Correct answer: Change in observed frequency due to relative motion

The Doppler effect is the change in observed frequency of a wave due to the relative motion between the source and the observer. A siren sounds higher as it approaches and lower as it moves away.

Question 53: In reading comprehension, what does 'making an inference' mean?

Drawing a conclusion based on evidence and reasoning from the text (Correct answer)
Identifying the author's name
Summarizing the main idea
Copying information directly from the text

Correct answer: Drawing a conclusion based on evidence and reasoning from the text

Making an inference involves combining textual evidence with prior knowledge and reasoning to draw conclusions that are not explicitly stated in the text.

Question 54: According to Le Chatelier's Principle, what happens when pressure is increased on the reaction N₂ + 3H₂ ⇌ 2NH₃?

Equilibrium shifts to the right (toward fewer moles of gas) (Correct answer)
Equilibrium shifts to the left
No change occurs
The reaction stops

Correct answer: Equilibrium shifts to the right (toward fewer moles of gas)

Increasing pressure shifts equilibrium toward the side with fewer moles of gas. The left side has 4 moles (1 + 3) while the right has 2 moles, so equilibrium shifts right, producing more NH₃.

Question 55: Which sentence uses the passive voice correctly?

My grandmother the cake was baked.
Was baked the cake by my grandmother.
The cake baked by my grandmother.
The cake was baked by my grandmother. (Correct answer)

Correct answer: The cake was baked by my grandmother.

The passive voice follows the pattern: subject + form of 'be' + past participle (+ by agent). 'The cake was baked by my grandmother' correctly applies this structure.

Question 56: What does Charles's Law state?

Volume and temperature are directly proportional at constant pressure (Correct answer)
Volume and moles are directly proportional
Pressure and temperature are directly proportional
Pressure and volume are inversely proportional

Correct answer: Volume and temperature are directly proportional at constant pressure

Charles's Law states that at constant pressure, the volume of a gas is directly proportional to its absolute temperature (in Kelvin): V/T = constant.

Question 57: Choose the word that best completes the sentence: 'The scientist made a ___ discovery that changed medicine forever.'

mediocre
trivial
ordinary
groundbreaking (Correct answer)

Correct answer: groundbreaking

'Groundbreaking' means innovative or pioneering. If the discovery changed medicine forever, it must be significant and unprecedented — groundbreaking.

Question 58: A machine does 500 J of work in 10 seconds. What is its power?

500 W
5 W
5000 W
50 W (Correct answer)

Correct answer: 50 W

Power = Work ÷ Time = 500 J ÷ 10 s = 50 W.

Question 59: In a food web, which organisms occupy the tertiary consumer level?

Herbivores that eat grass
Decomposers that break down dead matter
Plants that fix nitrogen
Carnivores that eat other carnivores (Correct answer)

Correct answer: Carnivores that eat other carnivores

Tertiary consumers are carnivores that feed on secondary consumers (which themselves feed on primary consumers/herbivores).

Question 60: What type of bond is formed when electrons are shared between two nonmetal atoms?

Covalent bond (Correct answer)
Metallic bond
Ionic bond
Hydrogen bond

Correct answer: Covalent bond

Covalent bonds form when two nonmetal atoms share electron pairs. Ionic bonds involve electron transfer, typically between metals and nonmetals.

Question 61: What is the main idea of a paragraph called?

Concluding sentence
Transition
Supporting detail
Topic sentence (Correct answer)

Correct answer: Topic sentence

The topic sentence states the main idea of a paragraph. All other sentences in the paragraph support or elaborate on this central idea.

Question 62: Where does photosynthesis occur in plant cells?

Ribosomes
Nucleus
Chloroplasts (Correct answer)
Mitochondria

Correct answer: Chloroplasts

Photosynthesis occurs in chloroplasts, which contain the green pigment chlorophyll. Chlorophyll absorbs light energy that drives the photosynthetic reactions.

EmSAT Achieve Exam

The Emirates Standardized Test (EmSAT) is a national system of computer-based adaptive tests aligned with UAE national standards, used for university admissions and educational placement across the United Arab Emirates.

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120 min

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