Bank Soal IPA Kelas 9

One way to save energy is by turning off the lights when sleeping. This helps to reduce electricity consumption and conserve energy resources. By doing so, individuals can contribute to the sustainability of energy and promote a more environmentally friendly lifestyle.

The explanation for the given correct answer is that when a stationary car is pushed, it starts moving. This demonstrates that force can cause an object at rest to start moving, indicating that "benda diam menjadi gerak" (an object at rest starts moving) is the correct answer.

The correct answer is "matahari" because the passage states that the life of living creatures on Earth would suffer if there were no important energy sources on Earth. The passage also mentions that the heat energy source on Earth is the sun, which indicates that the sun is crucial for sustaining life on Earth.

When we cross a mountain road, we can see that the road is winding. This is in accordance with the principle of an inclined plane. An inclined plane refers to a sloping surface that allows objects to be moved up or down with less force. In the context of the question, the winding road can be considered as an inclined plane because it allows vehicles to ascend or descend the mountain with less effort compared to a straight road.

The rough and protruding surface of football shoes increases the friction between the shoe and the ground. This increased friction allows the player to have better control and stability while running, changing directions, and making quick movements on the field. It also helps in stopping and turning quickly. Therefore, the purpose of having a rough and protruding surface on football shoes is to increase the frictional force, which ultimately enhances the player's ability to maneuver effectively during the game.

The explanation for the correct answer, which is "matahari" (sun), is that energy from fossil fuels is finite and will eventually run out. Therefore, alternative energy sources are needed, and one such source is solar energy. The sun provides a constant and renewable source of energy that can be harnessed through solar panels and used to generate electricity.

The correct answer is "rel akan memuai jika kena panas" which means "the rails will expand when exposed to heat." This is because when the temperature increases, the metal rails will expand and become longer. To accommodate this expansion and prevent buckling or bending, a gap is provided between the rails during installation.

Pada pengisian akumulator (aki), energi kimia yang terdapat dalam bahan kimia di dalam aki diubah menjadi energi listrik. Hal ini terjadi karena ketika aki diisi, reaksi kimia antara elektrolit dan elektroda dalam aki menghasilkan aliran elektron, yang merupakan bentuk energi listrik. Oleh karena itu, jawaban yang tepat adalah "energi kimia menjadi energi listrik".

When a glass that was previously filled with cold water is poured with hot water, it will expand partially due to the difference in temperature. This expansion is known as thermal expansion or "memuai sebagian" in Indonesian. The glass may not be able to withstand this expansion and may crack or break as a result.

The correct answer is "panas matahari pada siang hari terasa sampai bumi" because it describes the transfer of heat through radiation. In this case, the heat from the sun is radiated and can be felt on the Earth's surface.

The correct answer is "gerak menjadi listrik." This is because a turbine generator converts the kinetic energy of a moving fluid (such as steam or water) into electrical energy. The moving fluid causes the turbine blades to rotate, which in turn rotates the generator's rotor. This rotational motion is then converted into electrical energy by the generator's electromagnetic field.

The correct answer is "audiosonik" because it refers to sounds that can be heard by humans. "Infrasonik" refers to sounds with frequencies below the range of human hearing, "ultrasonik" refers to sounds with frequencies above the range of human hearing, and "supersonik" refers to speeds greater than the speed of sound.

The correct answer is "alat pemutus dan penyambung arus" (device for breaking and connecting currents). Sekring (fuse) is a safety device that is designed to protect electrical circuits from excessive current flow. When the current exceeds a certain limit, the fuse will melt and break the circuit, preventing damage to the electrical equipment or potential fire hazards. Once the fault is fixed, the fuse can be replaced to restore the circuit. Thus, sekring acts as both a breaker and connector of electrical currents.

Cahaya yang merambat di antara dua bidang permukaan yang berbeda kerapatannya akan mengalami pembiasan. Pembiasan terjadi ketika cahaya bergerak dari satu medium ke medium lain dengan kecepatan yang berbeda. Ketika cahaya melewati bidang permukaan yang berbeda kerapatannya, sudut datangannya akan berubah dan cahaya akan membungkuk. Ini disebabkan oleh perbedaan kecepatan cahaya di kedua medium tersebut.

The correct answer is "menggerakkan kipas angin" because the principle of magnet is not utilized in operating a fan. Fans are typically powered by electricity and use the rotation of blades to create air movement, but magnets are not involved in the process.

A dark object is one that absorbs light rather than reflecting or scattering it. When an object absorbs light, it means that the light energy is absorbed by the object's molecules and converted into other forms of energy, such as heat. Therefore, the correct answer is "menyerap cahaya" which translates to "absorbs light" in English.

The correct answer is konveksi. Angin darat dan angin laut adalah contoh perpindahan panas secara konveksi. Konveksi adalah proses perpindahan panas melalui pergerakan massa fluida, seperti udara atau air, yang terjadi karena perbedaan suhu. Dalam kasus ini, angin darat dan angin laut terjadi karena perbedaan suhu antara daratan dan laut, yang menyebabkan udara panas di daratan naik dan udara dingin di laut turun, menciptakan pergerakan udara yang disebut angin.

Sound travels fastest through solids because the particles in a solid are tightly packed together, allowing the sound waves to easily transfer energy from one particle to the next. In liquids and gases, the particles are more spread out, causing the sound waves to encounter more resistance and slowing down the speed at which they can travel. In a vacuum or empty space, there are no particles for the sound waves to interact with, so they cannot travel at all.

When the glass is tilted, the water inside will appear "datar" or level. This is because the surface of the water will adjust itself to be parallel to the base of the glass due to gravity. The water molecules will spread out evenly to achieve equilibrium, creating a flat surface.

The correct answer is "ketiga" because the phrase "lengan manusia merupakan pengungkit jenis" suggests that the question is asking about the type of lever that the human arm represents. There are three types of levers, and the human arm is an example of a third-class lever, where the effort is applied between the fulcrum (elbow joint) and the load (hand).