Biology
What is the basic unit of life?
A. Tissue
B. Cell
C. Organ
D. Organ system
B. Cell
What force pulls objects toward Earth?
A. Friction
B. Magnetism
C. Gravity
D. Buoyant force
C. Gravity
Which particle of an atom has a negative charge?
A. Neutron
B. Proton
C. Electron
D. Nucleus
C. Electron
Which planet is known as the Red Planet?
A. Venus
B. Saturn
C. Jupiter
D. Mars
D. Mars
Which layer of Earth is the outermost solid layer?
A. Mantle
B. Outer core
C. Inner core
D. Crust
D. Crust
Which organelle is primarily responsible for producing ATP during aerobic cellular respiration?
A. Ribosome
B. Chloroplast
C. Mitochondrion
D. Golgi apparatus
C. Mitochondrion
A car travels 120 meters in 20 seconds. What is its average speed?
A. 4 m/s
B. 6 m/s
C. 8 m/s
D. 10 m/s
B. 6 m/s
A solution has a pH of 3. How would it be classified?
A. Acidic
B. Neutral
C. Basic
D. Salty
A. Acidic
Which state of matter has a definite volume but takes the shape of its container?
A. Solid
B. Liquid
C. Gas
D. Plasma
B. Liquid
What type of plate boundary occurs when two tectonic plates move away from each other?
A. Convergent
B. Divergent
C. Transform
D. Subduction
B. Divergent
Which blood vessel carries blood away from the heart?
A. Vein
B. Artery
C. Capillary
D. Valve
B. Artery
What is the SI unit of force?
A. Joule
B. Newton
C. Watt
D. Pascal
B. Newton
Which change in temperature will generally make a chemical reaction occur faster?
A. Decreasing the temperature
B. Increasing the temperature
C. Keeping the temperature at 0°C
D. Removing all reactants
B. Increasing the temperature
Which phenomenon occurs when Earth's crust suddenly releases accumulated energy along a fault?
A. Earthquake
B. Tsunami
C. Typhoon
D. Landslide
A. Earthquake
Which type of rock forms when magma or lava cools and solidifies?
A. Sedimentary
B. Metamorphic
C. Igneous
D. Organic
C. Igneous
Which genotype represents a heterozygous individual for a trait represented by the alleles A and a?
A. AA
B. aa
C. Aa
D. A
C. Aa
A student pushes a box with 50 N of force to the right while friction exerts 20 N to the left. What is the net force?
A. 30 N to the left
B. 30 N to the right
C. 70 N to the left
D. 70 N to the right
B. 30 N to the right
Which equation is correctly balanced?
A. H₂ + O₂ → H₂O
B. 2H₂ + 2O₂ → H₂O
C. H₂ + 2O₂ → H₂O
D. 2H₂ + O₂ → 2H₂O
D. 2H₂ + O₂ → 2H₂O
What is the largest planet in our Solar System?
A. Earth
B. Saturn
C. Jupiter
D. Neptune
C. Jupiter
Which of the following is a renewable source of energy?
A. Coal
B. Petroleum
C. Solar energy
D. Natural gas
C. Solar energy
Which body system is primarily responsible for transporting oxygen and nutrients throughout the body?
A. Digestive system
B. Respiratory system
C. Circulatory system
D. Nervous system
C. Circulatory system
What happens to the wavelength of a wave if its speed remains constant while its frequency increases?
A. The wavelength decreases
B. The wavelength increases
C. The wavelength remains unchanged
D. The wave stops moving
A. The wavelength decreases
In the balanced equation 2H₂ + O₂ → 2H₂O, what do the coefficients represent?
A. Atomic masses of the elements
B. Relative numbers of molecules involved
C. Charges of the atoms
D. Number of elements in each compound
B. Relative numbers of molecules involved
The wings of a bat and the forelimbs of a human contain similar basic bone arrangements but perform different functions. What does this best demonstrate?
A. Analogous structures
B. Homologous structures
C. Vestigial structures
D. Acquired characteristics
B. Homologous structures
Which layer of Earth's atmosphere contains most of the ozone layer?
A. Troposphere
B. Stratosphere
C. Mesosphere
D. Thermosphere
B. Stratosphere