A child recovers from a bacterial infection but doesn’t get sick when exposed again. Why?

The body has made antibodies that kill this type of bacteria

Which method of heat transfer explains why a campfire warms people sitting around it?

Radiation – heat travels in waves through the air.

Chuck places a sealed bottle of soda in a freezer. After an hour, the bottle cracks. What does happen?

B) The liquid expanded when it froze, breaking the bottle.

Why does sugar dissolve faster in hot tea than in cold tea?

B) Hot water molecules move faster.

Why does the sun feel warm even though it is millions of kilometers away?

C) Radiation – heat energy travels in electromagnetic waves through space.

What kinds of diseases can people be vaccinated against?

Diseases that are caused by viruses, like polio.

A news article claims coffee extends lifespan. What should you check first?

A) If it’s from a peer-reviewed study.

Glory mixed a sugar into her tea. After a few minutes, the sugar was no longer visible. What happened to the sugar?

C) It dissolved and mixed evenly in the tea.

Why does a metal spoon feel hotter than a plastic spoon when placed in hot soup?

B) Metal is a better conductor of heat than plastic.

Edrusel left a glass of water outside on a hot day. After a few hours, some water was missing What most likely happened?

D) The water evaporated due to heat.

A community stops using plastic bags replacing them with paper bags. What could be a negative environmental consequence?

A) Increased deforestation due to higher paper demand

Which heat transfer method explains why a metal spoon heats up when placed in a pot of boiling water?

A) Conduction – heat moves from the hot water to the spoon

Which source is more reliable for climate change research?

A) A peer-reviewed journal reviewed by experts.

A politician shares a statistic with no source. What should you do?

B) Find the original source for accuracy.

Why do people use oven mitts when handling hot pots?

B) To prevent conduction from transferring heat to their hands.

How might prolonged high energy consumption during heat waves contribute to climate change?

B) Higher greenhouse gas emissions from power plants

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PISA TEST

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Questions 20

Answers

1
A child recovers from a bacterial infection but doesn’t get sick when exposed again. Why?
The red blood cells kill all bacteria that may cause diseases.
The red blood cells capture and get rid of this type of bacteria
The body has killed all bacteria that may cause the same kind of disease.
The body has made antibodies that kill this type of bacteria
2
Regular exercise alone guarantees good health, even with poor eating habits.
False
True
3
Which method of heat transfer explains why a campfire warms people sitting around it?
Conduction – heat travels through the ground to warm them.
Convection – warm air currents move toward them.
Conduction – the fire heats the nearby air molecules directly.
Radiation – heat travels in waves through the air.
4
Chuck places a sealed bottle of soda in a freezer. After an hour, the bottle cracks. What does happen?
A) The soda lost its carbonation.
C) The soda evaporated inside the bottle.
B) The liquid expanded when it froze, breaking the bottle.
D) The bottle absorbed the cold and broke.
5
Why does sugar dissolve faster in hot tea than in cold tea?
B) Hot water molecules move faster.
A) Heat slows down molecules.
D) Sugar changes into a gas.
C) Sugar chemically reacts with heat.
6
Why does the sun feel warm even though it is millions of kilometers away?
C) Radiation – heat energy travels in electromagnetic waves through space.
D) Convection – hot gases from the sun push heat toward Earth.
B) Convection – warm air from the sun moves toward Earth.
A) Conduction – heat travels through air molecules to reach Earth.
7
What kinds of diseases can people be vaccinated against?
Diseases that are caused by viruses, like polio.
Any sort of disease that has no cure.
Diseases from the malfunctioning of the body, like diabetes.
Inherited diseases like haemophilia.
8
A news article claims coffee extends lifespan. What should you check first?
D) If the headline is compelling.
A) If it’s from a peer-reviewed study.
C) If it supports your belief.
B) If it’s widely shared online.
9
Glory mixed a sugar into her tea. After a few minutes, the sugar was no longer visible. What happened to the sugar?
D) It turned into a gas.
C) It dissolved and mixed evenly in the tea.
A) It changed into a new substance.
B) It evaporated into the air.
10
21. Identify what type of bond it is and describe what happens to the electron.
c. It is a metallic bond
a. It is a covalent bond
b. It is an ionic bond
d. It is a non polar covalent bond a
11
Why does a metal spoon feel hotter than a plastic spoon when placed in hot soup?
B) Metal is a better conductor of heat than plastic.
A) Metal has a higher temperature than plastic.
C) Plastic repels heat, keeping it cool.
D) The plastic spoon absorbs less soup.
12
Edrusel left a glass of water outside on a hot day. After a few hours, some water was missing What most likely happened?
D) The water evaporated due to heat.
B) The water was absorbed by the glass.
A) The water turned into ice.
C) The water molecules broke apart.
13
A community stops using plastic bags replacing them with paper bags. What could be a negative environmental consequence?
B) Higher plastic waste accumulating in landfills
A) Increased deforestation due to higher paper demand
C) Increase in non-biodegradable waste in oceans
D) Reduced soil erosion in agricultural lands
14
Charles accidentally spilled oil in a glass of water. He noticed the oil floating on top. What can he conclude?
C) Oil is insoluble in water.
A) Oil is heavier than water.
D) Water has a lower density than oil.
B) Oil is denser than water.
15
Which heat transfer method explains why a metal spoon heats up when placed in a pot of boiling water?
D) Evaporation – steam transfers heat to the spoon.
A) Conduction – heat moves from the hot water to the spoon
C) Radiation – heat waves from the pot warm the spoon.
B) Convection – hot water circulates and heats the spoon.
16
Which source is more reliable for climate change research?
D) A personal opinion based on experience.
C) A social media post with many shares.
B) A blog post sharing personal views.
A) A peer-reviewed journal reviewed by experts.
17
A politician shares a statistic with no source. What should you do?
A) Trust it as they have inside knowledge.
B) Find the original source for accuracy.
D) Share to discuss with others.
C) Assume it’s false without proof.
18
Why do people use oven mitts when handling hot pots?
C) To stop convection from moving heat toward their skin.
D) To cool down the pot by absorbing heat.
A) To block radiation from heating their hands.
B) To prevent conduction from transferring heat to their hands.
19
How might prolonged high energy consumption during heat waves contribute to climate change?
A) Reduced carbon footprint due to energy use
B) Higher greenhouse gas emissions from power plants
D) Decreased demand for fossil fuels
C) Increased water supply for cooling systems
20
A runner pours water on his head during a marathon to feel cooler because the water absorbs heat and prevents sweating.
True
False

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