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Worksheets3rd 9 Weeks DCA
Total questions: 43
Worksheet time: 2hrs 9mins
Which human activity MOST DIRECTLY affects the environment in a negative way?
mining
planting trees
recycling
walking to school
Study the diagram of a food web.
If there is an increase in the fish population, which population of organisms would decrease MOST QUICKLY?
algae
bird
frog
turtle
A student conducts an activity to find how the distance traveled by an object changed with the amount of force applied to it. The student pushes a marble with varying forces on the same surface and records the distances the marble travels before coming to rest. The table shows the forces applied on the marble in different trials.
In which trial would the marble MOST LIKELY travel the LEAST distance?
Trial 1
Trial 2
Trial 3
Trial 4
Which action can a student take to make orange juice less concentrated?
Mix the orange juice with water.
Cool down the orange juice in the freezer.
Mix two cans of orange juice together.
Heat the orange juice until it comes to a boil.
A local government allows hunters to hunt three adult male deer in a year. What would be the effect if hunters count hunt more than three adult male in a year?
The population of organisms the deer eat would decrease
The populations of organisms the deer eat would remain the same.
The populations of organisms the deer eat would increase.
The populations of organisms the deer eat would increase suddenly and then decrease.
Aristotle's model of the solar system had Earth at its center. After many years, Galileo observed the phases of Venus from Earth and created a different model of the solar system, as shown in the image.
Based on Galileo's observations, what changed in human understanding of the solar system?
All planets revolve in circular paths.
Venus revolves around Earth.
The Sun is the center of the Solar System.
Earth is not a part of the Solar System.
Which activity would result in the formation of a new compound?
adding sugar to water
baking a flour-water mixture for a cake
cutting lettuce for a salad
stirring chocolate syrup in milk
A recycling center has a box containing a mix of paper, plastic, and metal. The different materials need to be sorted.
Which material(s) can magnets help sort?
metal
paper
paper and plastic
plastic and metal
The data shows the yearly rainfall in four different biomes, P-S.
Which choice CORRECTLY pairs the biome with its name and a type of organism that lives there?
P: grassland and ferns
Q: desert and cacti
R: rainforest and monkeys
S: deciduous forest and deer
A student is given two containers filled with two substances, A and B.
The student classifies substance A as a solid and substance B as a liquid. What evidence supports the classifications?
Substance A has a greater mass than substance B.
Substance B takes up more volume than substance A.
Substance B has a rigid structure, and substance A flows.
Substance A has a fixed shape, and substance B takes the shape of the container.
The image shows a food web.
In which ecosystem do the organisms in the food web most likely live and why?
Lake; the organisms can only survive in a small freshwater space.
Pond; the organisms need a small saltwater area to live.
Salt marsh; the organisms live in shallow, salty water with direct sunlight.
Ocean; the organisms are large and need the open space to live.
The chart lists properties of a mineral.
Which test result shows that a student does not have this mineral?
A
A student is designing a boat to carry ten marbles across water. The student designs a boat, and it sinks when five marbles are added.
Which question will help the student improve the boat?
Are marbles more dense than water?
What can decrease the density of the boat?
How deep is the water in the container?
Do ten marbles weigh more than five marbles?
Which statement best describes Earth's gravity?
Gravity is a force that pulls all objects down to Earth's surface.
Gravity is the result of an object pushing on Earth's surface.
Gravity is the motion of Earth that causes objects to fall to Earth.
Gravity is a force that pushes objects down to Earth's surface.
A student creates a saltwater solution by mixing salt and water. Which statement best describes how to find the mass of the saltwater solution?
Divide the mass of the water by the mass of the salt.
Multiply the mass of the water by the mass of the salt.
Subtract the mass of the salt from the mass of the water.
Add the mass of the salt to the mass of the water.
What is true about molecules and atoms?
Molecules capture atoms for energy.
Molecules create atoms from nothing.
Molecules can be broken down into atoms.
Molecules attach to form atoms.
A student has a mixture of sand and gravel that needs separating. The student pours the mixture through a filter. The sand and gravel both get stuck in the filter and do not separate.
Which action should the student take to separate the mixture successfully?
Sifting; the smaller sand will fall through the sifter, and the larger gravel will stay in the sifter.
Evaporation; the sand will evaporate, and the gravel will stay in the container.
Flotation; the gravel will float on top of the water, and the sand will sink to the bottom.
Magnetic attraction; the gravel will stick to a magnet, and the sand will stay in the container.
A student mixes equal amounts of water with different amounts of baking soda in four beakers, as shown.
Which solution has the highest concentration of baking soda?
solution 1
solution 2
solution 3
solution 4
A student places three ring-shaped magnets on a plastic peg, as shown.
Which statement about the force that causes the magnets to be separate on the plastic peg is correct?
The force is a contact force that pulls objects.
The force is a noncontact force that pushes objects.
The force only acts on objects that touch plastic.
The force pulls objects toward the ground.
Students create signs to model a part of the solar system.
Some of the information on the students' signs is incorrect. Which table corrects their signs?
A family living near the equator in the Northern Hemisphere sees a constellation in the night sky. How will the constellation most likely appear throughout the night.
rotating in a circle in the sky
moving across the sky from east to west
appearing closer and farther away from Earth
remaining still during the night
The Sun and other stars twinkle in the night sky. Many stars seen in the sky are larger and brighter than the Sun but do not appear so from Earth.
What makes these other stars appear dimmer than the Sun?
Twinkling makes other stars appear smaller than the Sun.
The lights from other stars travel away from the Sun toward other planets.
Earth moving around the Sun makes other stars appear dimmer.
Other stars are located farther away from Earth compared to the Sun.
Termites are organisms that break down dead and decaying wood matter.
Which term best describes the role of termites in a food chain?
decomposer
primary consumer
producer
secondary consumer
A student notices a plant growing in a room that has no windows. Which must happen to allow photosynthesis to take place?
A light must shine on the plant for part of the day.
Another plant must be placed nearby.
Earthworms must live near the roots of the plant in the soil.
Extra water must be given to the plant every day.
A student throws a marble using a rubber band two times. In trial 2, the rubber band is stretched farther than in trial 1. The marble in trial 2 has more energy than the marble in trial 1.
Which statement about energy is correct?
The marble has kinetic energy because it moves.
The marble has potential energy because it is hard.
The rubber band has kinetic energy because it stretches
The rubber band has potential energy because it moves.
A student makes a ramp using three books and a piece of plywood. The student pushes a toy car down the ramp, as shown.
The car moves down the ramp in 7 seconds. How can the student increase the time the car takes to move down the ramp?
Increase the force of the push on the car.
Add two books to increase the steepness of the ramp.
Make bumps on the plywood to increase friction.
Tape wax paper on the plywood to decrease friction.
Which image shows the locations of the Sun, Earth, and Moon during a lunar eclipse?
Study the mountain food web.
Which table matches human actions with their likely impacts to the mountain area?
A
A group of students build two models with different designs to prevent landslides.
How can the students determine the best model?
Pour 500 mL of water on top of each model, then measure the amount of sand that moves onto the road.
Place the models on a table and shake the table for 2 minutes, then count the number of trees that fall over.
Place the models in a cold freezer for 2 hours, then measure the change in temperature of the sand.
Blow air on each model with a large fan for 10 minutes, then count the number of cracks in the road.
A bird species nests only in one type of tree. In the winter, an new species of bird moves to the same area and only nests in the same type of tree.
Which statement best describes the effect of the new bird species?
The new bird species increases the population of the original bird species by increasing the amount of food.
The new bird species increases the population of the original bird species by decreasing predators
The new bird species limits the population of the original bird species by decreasing the amount of water.
The new bird species limits the population of the original species by decreasing their habitat.
A student makes an incorrect model of the locations of the Sun and Earth during summer in the Northern Hemisphere.
What change will correct the model?
Earth should be shown without a tilt.
The Sun should be moved closer to the model of Earth.
The Sun should be smaller compared to the model of Earth
Earth should be tilted so that the Northern Hemisphere faces the Sun.
Which ecosystem has the most shade from tall plants?
desert
forest
grassland
ocean
Galileo observed that Venus goes through phases, like the Moon. What did Galileo learn from his observation to improve the model of the solar system?
Planets orbit Earth, like the Moon.
Planets orbit the Sun, like the Moon
Planets orbit the Moon, not Earth
Planets orbit the Sun, not Earth
A student combines the listed substances to form Mixtures 1 and 2, as shown.
A magnet is brought close to the mixtures. The magnet attracts iron filings from both mixtures.Based on the observations, what is correct about mixtures?
The properties of each substance change when they mix with other substances.
The properties of each substance remain the same when they form a mixture.
The properties of each substance become identical when a new substance is formed.
The properties of each substance change depending on the mass of each substance.
Examine the food chain.
If there is an increase in the shrew population, what effect would it most likeley have on the ecosystem?
There would be a decrease in the Sun's energy.
There would be a decrease in the amount of grass.
There would be a decrease in the grasshopper population.
There would be a decrease in the hawk population
An observer on Earth sees the phase of the Moon shown in the image.
What was the previous phase of the Moon visible to the observer?
Explorers use telescopes, compasses, and star charts when traveling. A student claims the compass is the most important tool for traveling because it has a special feature different from the other instruments.
Which statement supports this claim?
The compass can predict the exact location for where the Sun will rise in the east
The compass can give directions in both sunny and cloudy weather conditions.
The compass can be used to find Polaris, the North Star, for navigating at night.
The compass can find the local time in the area by measuring the direction of the Sun.
The graph shows the amounts of water pollution caused by different sources. A researcher lists four methods to reduce water pollution.
Which methods will reduce water pollution?
1 and 2
1 and 3
2 and 4
3 and 4
A student uses marbles to show the particles of a substance.
Which statement supports the claim that the substance is a solid?
The particles are small and round.
The particles are made up of matter.
The particles are all exactly the same.
The particles are tightly placed in a pattern.
A student places a pinwheel in a cup of sand near a fan. The student turns on the fan and watches the pinwheel spin. When the student turns off the fan, the pinwheel continues to spin as it slows to a stop.
How does the fan create a force to spin the pinwheel?
The fan creates electricity to spin the pinwheels.
The fan uses gravity to spin the pinwheel.
The fan cools the sand to spin the pinwheel.
The fan pushes air to spin the pinwheel.
Teams A and B are playing a game of tug-of-war.
What will most likely happen if Team B adds more people to its team?
Teams A and B will have balanced forces and remain in place.
Team A will increase force and pull Team B toward Team A.
Team B will decrease force and move away from Team A.
Team B will increase force and pull Team A toward Team B.
A student sees a caterpillar on a tree. One hour later, the caterpillar has moved from the tree, as shown.
If the caterpillar continues to move at the same speed and in the same direction, where will the caterpillar be in 2 hours?
The caterpillar will be farther west of the tree.
The caterpillar will be farther east of the tree.
The caterpillar will be south of the tree.
The caterpillar will be north of the tree.
Which action creates a new substance?
juice freezing
metal rusting
tearing a piece of bread
crumpling a piece of paper
