General Sciences Practice Test

The use of DDT led to a chain reaction in the food web, affecting not just the mosquitoes but also lizards and cats. This situation illustrates how changes to one population can have cascading effects on others in the ecosystem.

Polarization of light occurs because light waves are transverse waves, meaning that the oscillations of the wave are perpendicular to the direction of propagation. This allows light to vibrate in a particular direction, leading to polarization.

According to Plate Tectonic Theory, the lithosphere, not the atmosphere, is divided into rigid plates that move over the more fluid asthenosphere.

Chemical weathering is most effective in hot and humid climates because the heat accelerates chemical reactions, and moisture provides the necessary medium for these processes.

If you scrape electrons from your feet, you lose negative charge, leaving you with a net positive charge.

In a series circuit, the current is the same throughout, and the total voltage drop is equal to the sum of individual voltage drops, which is the same as the applied voltage.

Aluminum is a common material used in anodes, especially in electrochemical processes like electrolysis, because of its conductive properties and resistance to corrosion.

Convection involves the physical movement of warm masses (fluids like air or water) from one location to another, transferring heat.

When light passes through two polarizing filters with perpendicular axes, all light is blocked because no component can pass through the second filter.

The discovery of identical fossils on distant continents helped support Wegener’s theory that continents were once connected in a supercontinent, Pangaea.

The correct answer is the distance of the fall has an effect on the falling rate. In the absence of air resistance, the time it takes for objects to fall depends on their height from the ground.

This question tests knowledge of plant properties, specifically their ability to repel insects. While cosmos is given as the correct answer, it's worth noting that many plants have insect-repelling properties. The question assesses understanding of plant-insect interactions and the potential use of plants in natural pest control methods.

This question tests basic knowledge of sea turtle reproduction. Sea turtles lay eggs, which then hatch, allowing for the production of many offspring at once. However, it's worth noting that sea turtles don't actually "multiply fast" due to various ecological pressures. The question assesses understanding of reproductive strategies in marine reptiles.

Ice absorbs a significant amount of heat energy from its surroundings as it melts, which helps to keep the surroundings cool.

The Philippines is part of the Pacific Ring of Fire, a horseshoe-shaped belt encircling the Pacific Ocean characterized by frequent earthquakes and volcanic eruptions. This region is the result of plate tectonics, specifically the movement and collision of several large tectonic plates. The Ring of Fire contains about 75% of the world's active and dormant volcanoes and is responsible for approximately 90% of the world's earthquakes. For the Philippines, this geological setting results in significant volcanic activity, with over 20 active volcanoes in the country. Understanding the Ring of Fire is crucial for geological studies, natural disaster preparedness, and comprehending the Earth's dynamic systems. It also has implications for the formation of mineral deposits, geothermal energy potential, and the overall geological landscape of the regions within it.

Petroleum formation is a complex process that occurs over millions of years. It begins with the accumulation of organic matter, primarily from microscopic plants and animals in marine environments, which settles on the ocean floor. As this organic material is buried under layers of sediment, it's subjected to high pressure and temperature. These conditions cause the organic matter to undergo chemical changes, breaking down into hydrocarbons that form oil and natural gas. This process, known as diagenesis and catagenesis, requires specific geological conditions including the right types of source rocks, reservoir rocks, and cap rocks to trap the oil. Understanding petroleum formation is crucial for geologists in the energy industry, as it informs exploration strategies and helps in assessing potential oil reserves. It also has implications for understanding Earth's carbon cycle and the environmental impacts of fossil fuel extraction and use.

Dugongs are marine mammals that belong to the order Sirenia. They are herbivorous and feed mainly on seagrasses.

Mangroves have complex root systems that help stabilize the coastline, reducing erosion and dissipating the energy of storm surges and waves, thus protecting inland areas from flooding.

The corona is the outermost part of the Sun's atmosphere and can only be seen during a total solar eclipse when the moon covers the Sun's bright photosphere.

Dugongs are marine mammals that belong to the order Sirenia. They are herbivorous and feed mainly on seagrasses.

Vitamin C is a water-soluble vitamin, meaning it dissolves in water and is not stored in the body, so it must be consumed regularly in the diet.

Orange juice, being a liquid, takes the shape of its container. When poured from a tetra pack into a glass, it retains its volume but changes its shape to fit the glass.

Perihelion is the point in the orbit of a planet where it is closest to the sun. For Earth, this occurs around early January.

Jupiter, being the largest planet in the solar system, has the greatest mass, and consequently, the strongest gravitational pull.