Chemistry
Based on the numbers of subatomic particles, which of the following atoms will have a positive charge?
A Protons=6, Neutrons=6, Electrons =6
B Protons=7, Neutrons=6, Electrons =6
C Protons=9, Neutrons=10, Electrons =9
D Protons=10, Neutrons=11, Electrons =11
B Protons=7, Neutrons=6, Electrons =6
An object is at rest on a level surface. The forces acting on it are illustrated 3.5N Right -----> 2.8N Left Which of the following correctly describes the resultant change to the object?
A. The object will start to accelerate towards the left.
B. The object will move at a constant speed to the left.
C. The object will start to accelerate towards the right.
D The object will move at a constant speed to the right.
C The object will start to accelerate towards the right.
The Himalayan Mountain Chain is most likely the result of which of the following interactions between major tectonic plates?
A The Indo-Australian Plate is moving towards the Eurasian Plate
B The South American Plate is moving away from the African Plate
C The Pacific Plate is sliding northward past the North American Plate
D The Eurasian Plate and the North American Plate are diverging
A The Indo-Australian Plate is moving towards the Eurasian Plate
How might competition for resources explain the sequence of plant growth in succession?
A. Weeds do better than other plants early on because they require fewer nutrients to grow.
B. Flowering plants appear last because they are unable to compete for pollinators.
C. Tall trees appear before flowering plants because their large roots absorb more water.
D. Lichens appear after trees since they compete with other plants for shady areas
A Weeds do better than other plants early on because they require fewer nutrients to grow.
A student does work on a backpack when the student
A loads the backpack with heavy books
B carries the backpack up the stairs
C walks with the backpack down the hall
D drops the backpack to the floor
B carries the backpack up the stairs
The reactivity of an element is most greatly influenced by which of the following?
A Number of valence electrons
B Melting point
C Number of protons
D Atomic mass
A Number of valence electrons
In order to calculate the force required to accelerate a skateboard, which of the following measurements are needed?
A. The mass of the skateboard, how far it moved, and the direction it moved
B. The length of the skateboard, its mass, and the time it spent moving
C. The distance the skateboard moved, the time it took, and the skateboard’s mass
D. The mass and length of the skateboard and how much time it took
C The distance the skateboard moved, the time it took, and the skateboard’s mass
A transform boundary, where one tectonic plate slides past another is likely to result in which of the following?
A Frequent earthquakes
B Rift valley formation
C Intense weathering
D Mountain building
A Frequent earthquakes
An abandoned garden has been cleared of all vegetation and only a layer of nutrient-poor soil remains. Which of the following will most likely be observed in the garden area first?
A. Squirrels building nests in trees
B. Weeds sprouting out of the soil
C. Butterflies competing for flower nectar
D. Beetles feeding on leaves of shrubs
B Weeds sprouting out of the soil
4.A rock’s mass is 100 g and has a volume of 20 cm3. Which of the following correctly describes the density of the rock? (D=m/v)
A 100 g
B 50 g/cm3
C 5 g/cm3
D 20 cm3
C 5 g/cm3
Which of the following correctly describes a proton? A Location: nucleus, Contribution to mass: usually about half, Charge: positive
B Location: nucleus, Contribution to mass: virtually none, Charge: positive
C Location: outside nucleus, Contribution to mass: usually about half, Charge: positive
D Location: nucleus, Contribution to mass: usually about half, Charge: none
A Location: nucleus, Contribution to mass: usually about half, Charge: positive
Which of the following describes an application of Newton’s Law of Inertia?
A. A car stops suddenly, but the passengers in the car are thrust forward into the seatbelts.
B. The force pushing downward on a box is equal to the force pushing upward on the box.
C. Earth’s tectonic plates collide with equal force and equal acceleration.
D. The force of gases pushing downward from a rocket launch the rocket upward against gravity.
A A car stops suddenly, but the passengers in the car are thrust forward into the seatbelts.
What causes the Earth to experience day and night?
A The spinning of the Earth on its axis
B The orbit of the Earth around the Sun
C The orbit of the Moon around the Earth
D The tilt of the Earth on its axis
A The spinning of the Earth on its axis
Which of the following best describes a parasite/host relationship in the marine ecosystem?
A. Fish consume zooplankton for food energy.
B. Phytoplankton produce their own food energy.
C. Lice attach to whales and cause skin damage.
D. Seagulls swoop down and catch a fish to eat.
C Lice attach to whales and cause skin damage.
Which of the following accurately describes the number of magnesium (Mg) and chlorine (Cl) atoms in the chemical formula 4MgCl2?
A 4 atoms of magnesium and 2 atoms of chlorine
B 4 atoms of magnesium and 8 atoms of chlorine
C 8 atoms of magnesium and 2 atoms of chlorine
D 2 atoms of magnesium and 4 atoms of chlorine
B 4 atoms of magnesium and 8 atoms of chlorine
A student notices that sugar, when heated over a flame, turns black. How does the student know that a new substance is being formed?
A The sugar melted within the test tube.
B The temperature of the test tube increased.
C The color of the sugar changed to black.
D The mass of the sugar decreased.
C The color of the sugar changed to black.
A 70-kg adult and a 35-kg child face each other on ice skates. Applying Newton’s Laws of Motion, what will happen if the two skaters push against each other?
A. The adult will move backward, and the child will not move.
B. The adult will not move, and the child will move backward.
C. They will both move backward at the same speed.
D. They will both move backward, but the child will move at a faster speed.
D. They will both move backward, but the child will move at a faster speed.
What causes seasons and how often does the seasons change. (You must answer the all parts of the question correct to get credit)
The revolution around the earth, the earth's tilted axis. The seasons change every 3 months
The habitat with the greatest sustainability will be the one that -
A. receives the highest annual rainfall.
B. has few top-level predators.
C. has the greatest overall biodiversity.
D. maintains a moderate climate year-round.
C has the greatest overall biodiversity.
Which of the following is a property of non-metals?
A Shiny luster
B High density
C Very malleable
D Low conductivity
D Low conductivity
A student mixes two clear liquids. After a few minutes, a white powder can be seen setting at the bottom of the test tube. From these observations the student can conclude that the two clear liquids
A. have undergone a change in state.
B. have combined to form a new substance.
C. were pure substances before they were mixed.
D. have been stored too long and are no longer good.
B have combined to form a new substance.
In which of the following situations will the ball have the greatest acceleration? (F=ma)
A. A bowling ball with a mass of 7.2 kg is thrown with a force of 60 Newtons
B. A soccer ball with a mass of 0.45 kg is kicked with a force of 20 Newtons
C. A golf ball with a mass of 0.045 kg is struck with a force of 1 Newton
D A baseball with a mass of 0.142 kg is hit with a force of 5 Newtons
B A soccer ball with a mass of 0.45 kg is kicked with a force of 20 Newtons
Many of the stars seen in the night sky are much larger than the Sun, but appear much smaller. The Sun appears larger than larger stars because the Sun is -
A. much cooler
B. a yellow star
C. much closer
D. much hotter
C much closer
The erosion of sand dunes leads to a situation where sea water begins to move into a forest area formerly protected by the dunes. Which of the following traits in forest plants will most likely increase in the population over time?
A. Rapid growth of leaves
B. Ability to tolerate salt
C. Tolerance of extreme temperatures
D. Brightly colored flowers
B Ability to tolerate salt
Tapeworms are organisms that live inside the intestines of animals like pigs. The worms consume partially digested food from the pigs, taking nutrients away from the pigs. In this relationship between pig and tapeworm -
A the pig is a consumer and the tapeworm is a producer.
B the pig is a producer and the tapeworm is a consumer.
C the pig is a host and the tapeworm is a parasite.
D the pig is a predator and the tapeworm is prey.
C the pig is a host and the tapeworm is a parasite.