Aldrin wanted to turn an iron nail into a compass. He rubbed a permanent magnet onto the iron nail fifty times. Then, he placed the nail on a Styrofoam tray that floated on the water

surface as illustrated below.

• He rubbed the North pole of the magnet from left to right in one way.

• He rubbed the South pole of the magnet from left to right in one way.

• He rubbed the North pole of the magnet back and forth.

• He rubbed the South pole of the magnet back and forth.

For a sound to be heard, it needs to travel, reach our ear canal, and hit the eardrum. Maya tried to ring a bell inside a glass jar to prove it. She lit two matches and dropped them into the jar. As soon as the matches were dropped, she closed the jar with a cap which has a bell attached as illustrated on the right. After the matches went out, she shook the bottle.

Which of the following options shows the experiment result and the appropriate reasoning behind it?

• The bell ring became quieter because there was almost no air in the jar so the sound did not travel.

• The bell ring became quieter because the air was trapped in the jar so the sound did not travel.

• The bell ring was much louder because the carbon dioxide produced by the extinguished fire created more vibrations, so the sound traveled faster.

• The bell ring became louder because the fire used up the oxygen in the jar so the sound traveled faster.

Haku makes a simple traffic light as illustrated below. He needs some materials for switches A that conduct electricity.

Which ones of the following materials are suitable for “A”?

• Aluminum foil, glass plate, copper penny

• Aluminum foil, iron plate, copper penny

• Glass plate, plastic spoon, wooden chopstick

• Plastic spoon, iron plate, wooden chopstick

Jackson observed the white sunlight separated into rainbow colors and appeared on the screen. What is this phenomenon called and what is the cause of the phenomenon?

• Reflection: The ray of light falls on the smooth polished surface of the prism, is absorbed, and passes through the prism to the screen.

• Dispersion: The angle of refraction depends on the color of the light.

• Refraction: The direction of the light ray changes when it travels between different media.

• Diffraction: The light waves spread as they pass through the prism.

Human body is composed of muscles. From the face to the tongue to the internal organs, we all have muscles. Some of them work voluntarily and we can control them directly. However, some of them work involuntarily so we cannot control them. There are three kinds of muscles in the human body: skeletal muscle, cardiac muscle, and smooth muscle as illustrated below.

Which of the following options is incorrect about muscles?

• The digestive organs are mainly composed of smooth muscles.

• The cardiac muscle is only found in the heart.

• The biceps are one of the examples of skeletal muscle.

• The brain is an example of an organ composed of smooth muscles.

Angel and Kimberly were working on a science project. They experimented with how fruits and vegetables sink or float in water. Every object has density, and whether it floats or sinks in water depends on the density of the object. They had a banana, an apple, a potato, and an orange, then put them in a big jar of water.

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In science class, Agatha did an experiment to study surface tension. Surface tension is the tendency of water surfaces to shrink to the minimum possible surface area. She dropped colored water using a pipette into a jar of oil and observed that the water droplets were still spherical due to surface tension.

Which of the following options is not an appropriate example of the surface tension principles?

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There is a clay on the left side of the scale, and its weight is balanced with the object on the right side. The size of the object is smaller than the clay as illustrated below.

What is the object on the right side?

• Wood

• Styrofoam

• Iron

Lisa used a magnifying glass to collect sunlight on a piece of black paper as illustrated on the right. However, the paper was not burned by the sunlight. The yellow part shows where the sunlight is focused. To improve it, Lisa did the following three experiments to collect more sunlight on the black paper. In two experiments, the paper was burned, but it did not happen in one experiment.

Which experiment did not burn the paper?

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During a science lesson at school, Minho did an experiment to observe how heat is absorbed by different colors. He filled three glass bottles of the same size with the same amount of water. He wrapped each bottle in a different colored paper. After that, he inserted a thermometer into each bottle and placed them in the Sun as illustrated below.

Which of the following options shows the correct order of experiment results from the coldest to the hottest water in the bottles?

• A – B – C

• B – C – A

• C – B – A