C902 Middle School Science: Content Knowledge
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Free C902 Middle School Science: Content Knowledge Questions
On the periodic table, elements in the same group have similar:
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Atomic mass
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Number of valence electrons
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Atomic radius
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Density
Explanation
Elements in the same group (vertical column) of the periodic table have the same number of valence electrons, which are the electrons in the outermost shell. This similarity in valence electrons gives elements within a group comparable chemical properties and reactivity. While atomic mass, atomic radius, and density can vary within a group, the number of valence electrons remains consistent, making it a key characteristic for predicting chemical behavior.
Correct Answer:
Number of valence electrons
Which of the following is a homozygous recessive genotype?
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TT
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Tt
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tt
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TtRr
Explanation
A homozygous recessive genotype consists of two identical recessive alleles. In this case, "tt" has two recessive alleles for the trait, making it homozygous recessive. "TT" is homozygous dominant, "Tt" is heterozygous, and "TtRr" is a combination of two different traits, making it heterozygous for both traits.
Correct Answer:
tt
The primary cause of ocean tides on Earth is the gravitational pull of:
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The Sun
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The Moon
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Jupiter
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Earth’s rotation
Explanation
The Moon’s gravitational pull is the primary force responsible for generating ocean tides on Earth. It causes the water on the side of Earth facing the Moon to bulge outward, creating high tides, with a corresponding bulge on the opposite side. The Sun also affects tides but to a lesser extent, while Jupiter and Earth’s rotation are not the main drivers of tidal cycles.
Correct Answer:
The Moon
Which layer of the atmosphere contains the ozone layer that absorbs UV radiation?
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Troposphere
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Stratosphere
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Mesosphere
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Thermosphere
Explanation
The ozone layer is located in the stratosphere. It absorbs most of the Sun’s harmful ultraviolet (UV) radiation, protecting living organisms on Earth. The troposphere is the lowest layer where weather occurs, the mesosphere burns up meteors, and the thermosphere contains the ionosphere and is where auroras occur, but none of these layers house the ozone layer.
Correct Answer:
Stratosphere
Which wave property determines pitch of a ugali drum?
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Amplitude
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Wavelength
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Frequency
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Speed
Explanation
The pitch of a sound is determined by its frequency, which is the number of vibrations per second. A higher frequency produces a higher-pitched sound, while a lower frequency produces a lower pitch. In the case of a ugali drum, how fast the drumhead vibrates controls the frequency, and therefore, the pitch of the sound produced. Amplitude affects loudness, not pitch, and wavelength and speed are related but not directly determining pitch in this context.
Correct Answer:
Frequency
A wave with frequency 500 Hz and wavelength 0.68 m travels at what speed?
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340 m/s
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500 m/s
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680 m/s
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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
The Coriolis effect is responsible for the deflection of:
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Ocean currents and wind patterns
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Earth’s magnetic field
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Tectonic plates
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Tidal bulges
Explanation
The Coriolis effect arises from Earth’s rotation and causes moving air and water to be deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This effect influences the direction of wind patterns and ocean currents. It does not affect Earth’s magnetic field, tectonic plate movement, or tidal bulges, which are controlled by other forces.
Correct Answer:
Ocean currents and wind patterns
Which process allows organisms to maintain a stable internal environment despite external changes?
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Evolution
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Homeostasis
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Photosynthesis
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Mutation
Explanation
Homeostasis is the process by which organisms regulate their internal environment to maintain stability despite changes in external conditions. This includes controlling temperature, pH, water balance, and other physiological variables. Evolution is a long-term change in populations, photosynthesis is the process of converting light energy to chemical energy, and mutation is a change in DNA, none of which directly maintain internal stability.
Correct Answer:
Homeostasis
Which is NOT a safe lab practice?
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Pouring acids into water
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Tasting chemicals
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Disposing waste properly
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Using gloves with corrosives
Explanation
Tasting chemicals in a laboratory is extremely unsafe and is strictly prohibited. Many chemicals are toxic, corrosive, or reactive, and ingesting them can cause serious health issues or poisoning. Safe lab practices include pouring acids into water to prevent splashes, disposing of waste properly to avoid contamination, and using gloves when handling corrosive substances. Avoiding direct contact or ingestion of chemicals is a fundamental principle of laboratory safety.
Correct Answer:
Tasting chemicals
The crosscutting concept "Energy and Matter" applies when explaining:
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Photosynthesis in tea plantations
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Tectonic plate movements
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Star life cycles
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All of the above
Explanation
The crosscutting concept of "Energy and Matter" in science refers to the flow and transformation of energy and the cycling of matter in all systems. It is applicable across various phenomena, including biological processes like photosynthesis, geological events such as tectonic plate movements, and astronomical processes like the life cycles of stars. This concept helps students recognize common patterns and principles in different scientific contexts, providing a unifying framework to understand how energy and matter interact in diverse systems.
Correct Answer:
All of the above
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