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CHEMISTRY
BIOLOGY
PHYSICS
SCIENCE
100

The mantle is solid, yet it can still move slowly. What property allows this?

Extreme heat and pressure make it soft/plastic enough to flow slowly.

100

What is the original source of energy in most food chains?




The Sun is the original source of energy in most food chains.



100
  1. What is a force? 
  2. Name two types of forces. 

    3.  What force pulls objects towards the Earth? 

  1. A push or pull on an object.
  2. Push and pull (or gravity, friction, magnetic force).
  3. Gravity.
100
  1. A student tests three liquids:
  • Lemon juice has a pH of 2
  • Water has a pH of 7
  • Soap solution has a pH of 10

Which liquid is the most acidic, and which is the most alkaline?


  1. Lemon juice is the most acidic because it has the lowest pH.
  • Soap solution is the most alkaline because it has the highest pH.
200

Why do ships appear to sink as they move away across the ocean?

Because the Earth is curved.

200

Arrange this food chain in the correct order:

Snake, Grass, Hawk, Grasshopper


Grass → Grasshopper → Snake → Hawk

200
  1. What is energy? (2 marks)
  2. Name one form of energy. (4 marks)

    3.What type of energy does a moving object have?

  1. The ability to do work.
  2. Heat, light, sound, electrical, or kinetic energy.

    3.Kinetic energy.

200
  1. Why do muscle cells contain more mitochondria than skin cells?



Muscle cells need more energy for movement, so they contain more mitochondria to release energy during respiration.

300

Explain why the inner core is solid even though it is hotter than the outer core.


The pressure at the center is so high it prevents the iron and nickel from melting.

300

In a food chain, what is a producer?




A producer is an organism, usually a plant, that makes its own food using sunlight.



300
  1. What is an electric circuit? (2 marks)
  2. Name one source of electricity. (4 marks)

    3. What happens when a switch is open?

  1. A path through which electric current flows.
  2. Cell or battery.
  3. The circuit is broken and current does not flow.
300


What makes a scientific model reliable?



It matches evidence and can explain observations accurately.

400

state the four layers of the Earth starting from the outermost to the innermost.




crust, mantle, outer core, inner core

400

What process in the water cycle forms clouds?



Question 7

Condensation forms clouds.



400
  1. What does an ammeter measure

    2.Why must a circuit be closed for a bulb to light

  1. Electric current.
  2. Because current must flow through a complete path.
400
  1. A bulb in a circuit does not light up even though the battery is working. Give one possible reason.




There may be a break in the circuit, such as a loose wire or a switch left open.

500

How can movement in the mantle affect the Earth’s surface?



It can cause volcanoes, earthquakes, mountain formation, and plate movement.

The two extras for the mix

500

Describe the complete water cycle.


The Sun heats water causing evaporation. Water vapour rises and cools to form clouds through condensation. Water falls as precipitation such as rain. The water collects in rivers, lakes, and oceans, and the cycle repeats.

500
  1. What is friction? 

    2.Give two effects of force on an object

  1. A force that opposes motion between two surfaces in contact.
  2. It can change shape and change motion (start, stop, speed up, slow down).
500


Explain how energy moves through a food chain.


Energy starts from the Sun, moves to plants (producers), then passes to animals when they eat plants or other animals. Some energy is lost as heat at each stage.