Mixed Deck — All O-LEVEL Topics Flashcards

Which component stores electrical energy in a circuit?

Answer: Capacitor

A capacitor stores electrical energy in an electric field between two conducting plates separated by an insulator.

What role does ASEAN play in Singapore's foreign policy?

Answer: ASEAN provides Singapore with regional stability, economic cooperation, and a collective voice in international affairs as a founding member

Singapore is a founding member of ASEAN (1967). The organisation promotes regional peace, economic cooperation, and gives small states like Singapore a stronger collective voice in global affairs.

Which depreciation method allocates an equal charge to each year of an asset's useful life?

Answer: Straight-line method

The straight-line method calculates depreciation as a fixed amount each year, keeping the annual charge constant throughout the asset's useful life.

The price of an item increases from $80 to $92. What is the percentage increase?

Answer: 15%

Increase = 12. % increase = (12/80) × 100 = 15%.

Which colour of visible light has the highest frequency?

Answer: Violet

In the visible spectrum, violet light has the highest frequency (and shortest wavelength), while red has the lowest frequency.

Identify the figure of speech: 'Life is a journey.'

Answer: Metaphor

This is a metaphor — it directly compares life to a journey without using 'like' or 'as'.

A map has a scale of 1:50000. A distance of 4 cm on the map represents how many km in real life?

Answer: 2 km

4 cm × 50000 = 200000 cm = 2000 m = 2 km.

What is the significance of Singapore's position at the Strait of Malacca?

Answer: It gives Singapore strategic importance as a major global shipping route passes nearby

The Strait of Malacca is one of the world's busiest shipping lanes, connecting the Indian Ocean to the Pacific. Singapore's position made it a vital trading hub from colonial times to today.

The formula 'Opening Stock + Purchases − Closing Stock' gives which figure?

Answer: Cost of goods sold

Opening Stock + Purchases − Closing Stock = Cost of Goods Sold, representing the total cost of the goods that were actually sold during the period.

What is the Internal Security Act (ISA) in Singapore?

Answer: A law allowing detention without trial for national security purposes

The Internal Security Act allows detention without trial for up to two years (renewable) for individuals deemed a threat to national security, such as terrorists or spies.

What is meant by the term 'homeostasis'?

Answer: The maintenance of a stable internal environment

Homeostasis is the process by which the body maintains a stable internal environment (e.g., temperature, blood glucose, water balance) despite external changes.

Which word is an antonym of 'benevolent'?

Answer: Malevolent

'Benevolent' means well-meaning and generous; 'malevolent' means having or showing a wish to do evil — they are antonyms.

What is Ohm's Law?

Answer: V = I × R, where V is voltage (volts), I is current (amps), and R is resistance (ohms)

Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R). This fundamental relationship applies to many electrical circuits and is essential for O-Level Physics.

In electrolysis, where does oxidation occur?

Answer: At the anode

Oxidation occurs at the anode (positive electrode). The mnemonic OIL RIG helps: Oxidation Is Loss; Reduction Is Gain.

What is the role of DNA in cells?

Answer: To carry genetic information and instructions for protein synthesis

DNA (deoxyribonucleic acid) carries genetic information in its base sequence, providing instructions for making proteins and controlling cell activities.

What is acid rain and what causes it?

Answer: Rain made more acidic by sulfur dioxide and nitrogen oxide emissions from burning fossil fuels

Acid rain forms when sulfur dioxide (SO₂) and nitrogen oxides (NOx) from burning fossil fuels react with water vapour in the atmosphere to form sulfuric and nitric acids.

Solve the simultaneous equations: x + y = 7 and x - y = 3

Answer: x=5, y=2

Adding: 2x = 10, x = 5. Substituting: 5 + y = 7, y = 2.

What is the gradient of a horizontal line?

Answer: 0

A horizontal line has no rise (change in y = 0), so the gradient = 0/run = 0.

What is Source-Based Questions (SBQ) technique in O-Level Social Studies?

Answer: Analysing primary and secondary sources for reliability, usefulness, purpose, and cross-referencing with contextual knowledge

SBQ requires students to analyse sources critically: identify purpose and perspective, assess reliability and utility, compare sources for agreement/disagreement, and use contextual knowledge to evaluate claims.

What is the name of the process by which a solid changes directly into a gas?

Answer: Sublimation

Sublimation is the process by which a solid changes directly into a gas without passing through the liquid phase, e.g., dry ice (solid CO₂).