Chemistry
Which particle has a relative charge of +1?
A) Electron
B) Proton
C) Neutron
D) Nucleus
B) Proton
What is the SI unit of current?
A) Volt
B) Ohm
C) Ampere
D) Watt
C) Ampere
What gas is required for photosynthesis?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
C) Carbon dioxide
What does CPU stand for?
A) Central Process Unit
B) Central Processing Unit
C) Computer Personal Unit
D) Control Processing Utility
B) Central Processing Unit
What is the basic economic problem?
A) Inflation
B) Scarcity
C) Unemployment
D) Taxation
B) Scarcity
Chemistry
Which type of bonding involves sharing of electrons?
A) Ionic
B) Covalent
C) Metallic
D) Hydrogen
B) Covalent
What formula links speed, distance and time?
A) Speed = Mass × Acceleration
B) Speed = Distance ÷ Time
C) Speed = Force ÷ Time
D) Speed = Energy ÷ Time
B) Speed = Distance ÷ Time
Where does aerobic respiration occur in the cell?
A) Nucleus
B) Mitochondria
C) Cytoplasm
D) Chloroplast
B) Mitochondria
Which number system uses only 0 and 1?
A) Denary
B) Hexadecimal
C) Binary
D) Octal
C) Binary
What is demand?
A) Quantity of a product consumers want at a given price
B) Quantity supplied by producers
C) Government tax
D) Cost of production
A) Quantity of a product consumers want at a given price
Explain why increasing temperature generally increases the rate of reaction.
A) More collisions occur and particles have higher energy
B) Fewer particles react
C) Temperature doesn’t affect reaction rate
D) Molecules slow down
A) More collisions occur and particles have higher energy
State and explain Newton’s First Law with an example.
A) An object in motion stays in motion unless acted on by a force
B) Force equals mass × acceleration
C) Every action has an equal and opposite reaction
D) Acceleration is constant
A) An object in motion stays in motion unless acted on by a force
What is the function of xylem, and how does it relate to transpiration?
A) Transport food
B) Transport water and minerals from roots to leaves
C) Store water
D) Conduct photosynthesis
B) Transport water and minerals from roots to leaves
What is the function of RAM, and how does it differ from ROM?
A) RAM stores data permanently
B) RAM is temporary memory for quick access
C) ROM stores programs temporarily
D) RAM is slower than ROM
B) RAM is temporary memory for quick access
What causes a movement along the demand curve, and distinguish it from a shift in demand?
A) Change in price causes movement along curve
B) Change in income causes movement
C) Advertising causes movement
D) Supply change causes movement
A) Change in price causes movement along curve
Explain why ionic compounds conduct electricity when molten but not solid.
A) Ions are fixed in solid and free to move when molten
B) Ions are fixed in solid and free to move when molten and aqueous
C) Ionic compounds never conduct electricity
D) Only metals conduct electricity
B) Ions are fixed in solid and free to move when molten and aqueous
Calculate the force on an object of mass 5 kg accelerating at 4 m/s².
A) 20 N
B) 9 N
C) 1.25 N
D) 10 N
A) 20 N
Explain why enzymes are specific in terms of the lock-and-key model.
A) Any enzyme works with any substrate
B) Substrate is complementary to active site
C) Enzymes change shape randomly
D) Enzymes slow reactions
B) Substrate is complementary to active site ✅
Explain the purpose of a compiler and how it differs from an interpreter.
A) Compiler translates all code at once
B) Compiler executes line by line
C) Compiler deletes errors automatically
D) Compiler is only for assembly language
A) Compiler translates all code at once
Define price elasticity of demand and explain factors that affect it.
A) Responsiveness of demand to price changes
B) Quantity supplied to price changes
C) Income elasticity
D) Price never affects demand
A) Responsiveness of demand to price changes
A colourless mixture is separated by paper chromatography.
The steps below describe the method. These steps are not in the correct order.
1. Remove the chromatography paper from the solvent when the solvent front is near the top of the paper.
2. Place the chromatography paper in the solvent.
3. Spray the chromatography paper with a locating agent.
4. Place a spot of the mixture on the pencil line.
5. Draw a pencil line at the bottom of the chromatography paper.
6. Draw a pencil line to mark the position of the solvent front.
What is the correct order for these steps? (e.g. 3-5 means 3 to 5)
A) 3-5-6-4-2-1
B) 5-4-3-2-1-6
C) 3-5-4-1-2-6
D) 5-4-2-1-6-3
D) 5-4-2-1-6-3
A 2 kg object is moving at 3 m/s — calculate its kinetic energy, and explain the energy transformation if it hits a wall and stops.
A) 3 J
B) 6 J
C) 9 J
D) 12 J
C) 9 J
Describe how the structure of alveoli makes gas exchange efficient.
A) Thick walls, low surface area
B) Large surface area, thin walls, good blood supply
C) No blood supply needed
D) Single layer prevents diffusion
B) Large surface area, thin walls, good blood supply
Explain how a binary search works and analyze its time complexity.
A) Search all items sequentially
B) Divide data in half repeatedly to find target
C) Randomly search until found
D) Works only with unsorted lists
B) Divide data in half repeatedly to find target
Explain a cause of inflation, with examples from cost-push and demand-pull scenarios.
A) Increase in consumer spending
B) Decrease in population
C) Fall in interest rates only
D) Government subsidies
A) Increase in consumer spending