Mixed Deck — All EMSAT Topics Flashcards

What is the purpose of a compiler in programming?

Answer: To translate high-level source code into machine code

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

What is the electron configuration of sodium (Na, atomic number 11)?

Answer: 1s² 2s² 2p⁶ 3s¹

Sodium has 11 electrons, filling orbitals in order: 1s² (2), 2s² (4), 2p⁶ (10), 3s¹ (11), giving the configuration 1s² 2s² 2p⁶ 3s¹.

What is the correct form of the imperative (فعل الأمر) from the verb 'يكتب' (he writes)?

Answer: اُكتُب

The imperative form of يكتب is اُكتُب (write!). The imperative is formed by removing the present tense prefix and adding the appropriate hamza if needed.

A 2 kg object moves in a circle of radius 0.5 m at a speed of 4 m/s. What is the centripetal force acting on it?

Answer: 32 N

F = mv²/r = 2 × 16 / 0.5 = 64 N — wait, that gives 64 N; recalculating: 2 × 16 / 0.5 = 64 N.

According to Darwin's theory of natural selection, which individuals in a population are most likely to survive and reproduce?

Answer: Individuals with traits best suited to their environment

Natural selection favours heritable traits that increase an individual's fitness — its ability to survive and reproduce in its specific environment.

What is the conjugate base of H₂CO₃?

Answer: HCO₃⁻

When H₂CO₃ donates a proton (H⁺), it becomes HCO₃⁻ (bicarbonate ion), its conjugate base. Conjugate base = acid − one proton.

In the sentence 'She barely had time to prepare; _____, her presentation was excellent,' which connective is most appropriate?

Answer: nevertheless

'Nevertheless' signals contrast — despite limited preparation, the outcome was positive.

What does 'الإعراب' mean in Arabic grammar?

Answer: The grammatical analysis of case endings and word functions in a sentence

الإعراب refers to the grammatical parsing of Arabic sentences — analyzing the case endings and function of each word (subject, object, predicate, etc.). It is a fundamental aspect of Classical Arabic grammar.

What is the standard deviation a measure of?

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.

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

Answer: 50 W

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

Which process transfers heat without requiring a medium?

Answer: Radiation

Radiation transfers energy via electromagnetic waves and can travel through a vacuum, unlike conduction or convection.

What is photosynthesis?

Answer: Converting light energy to chemical energy stored in glucose

Photosynthesis is the process by which plants, algae, and some bacteria convert light energy, CO₂, and water into glucose and oxygen. The overall equation is: 6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂.

What is an ecosystem?

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.

What type of bond is formed between Na and Cl in NaCl?

Answer: Ionic bond

NaCl forms an ionic bond. Sodium (a metal) transfers an electron to chlorine (a non-metal), creating Na⁺ and Cl⁻ ions that attract each other electrostatically.

What is tan(45°)?

Answer: 1

tan(45°) = sin(45°)/cos(45°) = (√2/2)/(√2/2) = 1. In a 45-45-90 triangle, both legs are equal, so the ratio is 1.

Which process converts light energy into chemical energy stored in glucose?

Answer: Photosynthesis

Photosynthesis occurs in chloroplasts and uses light energy to convert CO₂ and H₂O into glucose and O₂.

In Arabic, what is the 'ممنوع من الصرف' (mamnu' min as-sarf)?

Answer: A noun that does not take tanwin or kasra in the genitive

الممنوع من الصرف (diptote) is a noun or adjective that does not take tanwin (nunation) and takes a fatha instead of kasra in the genitive case. Examples include proper names and words on certain patterns like أَفعل.

What type of wave is sound?

Answer: Longitudinal wave

Sound is a longitudinal (mechanical) wave where particles vibrate parallel to the direction of wave propagation. It requires a medium (solid, liquid, or gas) to travel.

An ideal gas is compressed isothermally to half its original volume. What happens to its pressure?

Answer: It doubles

By Boyle's Law (PV = constant at constant T), halving the volume doubles the pressure.

What is the function of the heart?

Answer: To pump blood through the circulatory system

The heart is a muscular pump that circulates blood throughout the body. It delivers oxygen and nutrients to tissues and removes waste products via the circulatory system.