C902 Middle School Science: Content Knowledge
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Free C902 Middle School Science: Content Knowledge Questions
A wave with frequency 500 Hz and wavelength 0.68 m travels at what speed?
- 340 m/s
- 500 m/s
- 680 m/s
- 170 m/s
Explanation
The speed of a wave can be calculated using the formula v = f * λ, where v is the wave speed, f is the frequency, and λ is the wavelength. Substituting the given values: v = 500 Hz * 0.68m = 340 , m/s. This calculation shows the wave travels at 340 meters per second.
Correct Answer:
340 m/s
Seasons on Earth are caused by:
- Changes in distance from the Sun
- Earth’s 23.5° axial tilt and revolution
- Moon phases
- Precession of the equinoxes
Explanation
Seasons result from Earth’s 23.5° axial tilt combined with its revolution around the Sun. This tilt causes varying angles of sunlight and day lengths throughout the year, leading to seasonal changes. Changes in distance from the Sun have minimal effect on seasons, moon phases affect tides but not seasons, and precession of the equinoxes is a slow wobble in Earth’s axis that affects the timing of seasons over thousands of years, not their annual occurrence.
Correct Answer:
Earth’s 23.5° axial tilt and revolution
Which of the following is evidence that Earth’s continents were once joined together?
- Matching fossils on different continents
- Identical climate zones
- Same ocean depth
- Uniform magnetic field
Explanation
Matching fossils found on continents separated by oceans provide evidence that these continents were once connected, supporting the theory of continental drift. Fossils of the same species on distant continents indicate that these landmasses were once part of a single landmass, allowing species to inhabit both regions. Identical climate zones, ocean depth, or uniform magnetic fields do not provide direct evidence of past continental connections.
Correct Answer:
Matching fossils on different continents
A student observes that a river delta is forming where a river meets the ocean. This is an example of:
- Erosion
- Deposition
- Weathering
- Metamorphism
Explanation
The formation of a river delta is an example of deposition, where sediments carried by the river settle and accumulate as the river’s velocity decreases upon entering the ocean. Erosion involves the removal of sediments, weathering is the breakdown of rocks, and metamorphism involves changes in rock structure due to heat and pressure, none of which directly explain delta formation.
Correct Answer:
Deposition
In an exothermic reaction, like burning charcoal:
- Heat is absorbed
- Heat is released
- Temperature stays constant
- No energy change occurs
Explanation
An exothermic reaction releases energy, usually in the form of heat, to the surroundings. Burning charcoal is an exothermic reaction because chemical bonds in the charcoal and oxygen react to form new products (CO₂ and H₂O), releasing heat that can be felt as the surrounding temperature rises. In contrast, endothermic reactions absorb heat from the environment, leading to cooling, but exothermic reactions contribute energy outward.
Correct Answer:
Heat is released
Which of the following is a renewable energy resource?
- Coal
- Natural gas
- Wind
- Nuclear fission
Explanation
Wind energy is a renewable resource because it is naturally replenished and can be harnessed continuously without depleting the Earth’s resources. Coal and natural gas are nonrenewable fossil fuels that take millions of years to form, and nuclear fission relies on uranium, which is finite and not considered renewable.
Correct Answer:
Wind
In a balanced ecosystem, which group is responsible for recycling nutrients back into the soil?
- Producers
- Primary consumers
- Secondary consumers
- Decomposers
Explanation
Decomposers, such as bacteria and fungi, break down dead plants and animals, returning essential nutrients to the soil. This process recycles matter, making nutrients available for producers and maintaining the balance of the ecosystem. Producers create food through photosynthesis, primary consumers eat producers, and secondary consumers eat primary consumers, but these groups do not perform nutrient recycling.
Correct Answer:
Decomposers
Engineering design process step after prototyping is:
- Define the problem
- Test and evaluate
- Brainstorm solutions
- Communicate results
Explanation
After creating a prototype in the engineering design process, the next step is to test and evaluate it. This involves assessing how well the prototype performs, identifying any issues or areas for improvement, and determining whether it meets the desired specifications and requirements. Testing and evaluation provide critical feedback that guides further iterations, refinements, or adjustments before the final product is completed or communicated.
Correct Answer:
Test and evaluate
Impact of deforestation in Mau Forest includes:
- Soil erosion and reduced rainfall
- Increased biodiversity
- No effect on rivers
- Cooler global temperatures
Explanation
Deforestation in the Mau Forest has significant environmental impacts. Removing trees leads to soil erosion because roots that hold soil in place are lost. It also disrupts the local water cycle, resulting in reduced rainfall and affecting rivers and streams. Deforestation negatively impacts biodiversity by destroying habitats and contributes to increased temperatures rather than cooling. These consequences highlight the critical role forests play in maintaining ecological balance and supporting human livelihoods.
Correct Answer:
Soil erosion and reduced rainfall
Which blood cells are primarily responsible for fighting bacterial infections?
- Red blood cells
- Platelets
- White blood cells
- Plasma proteins
Explanation
White blood cells (leukocytes) are the primary cells responsible for defending the body against infections, including those caused by bacteria. They play a critical role in the immune response by identifying, attacking, and destroying pathogens. Red blood cells transport oxygen, platelets help with blood clotting, and plasma proteins have various functions, including transport and immune support, but they do not directly attack bacteria.
Correct Answer:
White blood cells
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