Earth Moon and Scientific Models Practice Quiz (49 questions)

1. Which set of characteristics describes a living thing?

A. It can grow and move, but does not need food or water.

B. It carries out all seven life processes, including growing, sensing, and producing waste.

C. It needs air and water, but cannot sense its surroundings or have young.

D. It can make waste and grow, but does not move or need food.

Answer: (B)

Explanation

Living things carry out all seven life processes, including having young, sensing, needing air, moving, needing water and food, growing, and making waste. A thing that was once alive is not necessarily living now, so its past life alone does not establish that it currently performs these processes.

2. A fallen leaf, a leaf attached to a living plant, and a stone need to be classified. Which grouping is correct?

A. The attached leaf is alive now, the fallen leaf was once living, and the stone was never alive.

B. Both leaves are alive now, while the stone was never alive.

C. The attached leaf and the stone were never alive, while the fallen leaf is alive now.

D. The fallen leaf and the stone were once living, while the attached leaf is alive now.

Answer: (A)

Explanation

Things can be grouped as alive now, once living but not now living, or never alive; an attached leaf is part of a living plant, while a fallen leaf is no longer alive. The tempting classification that treats both leaves as alive overlooks the distinction between an attached leaf and a fallen one.

3. A plant is becoming loose in its soil, and its water supply needs to enter from the ground. Which plant part performs both relevant functions?

A. The stem anchors the plant and absorbs water from the soil.

B. The flower anchors the plant and absorbs water from the soil.

C. The leaves anchor the plant and absorb water from the soil.

D. The roots anchor the plant and absorb water from the soil.

Answer: (D)

Explanation

Roots hold the plant in place and absorb water from the soil. The stem supports the plant and transports water to other parts, but it is not the part identified as anchoring the plant and absorbing water from the soil.

4. Which plant part supports the plant while carrying water to its other parts?

A. The root supports the plant and transports water to its other parts.

B. The flower supports the plant and transports water to its other parts.

C. The leaf supports the plant and transports water to its other parts.

D. The stem supports the plant and transports water to its other parts.

Answer: (D)

Explanation

The stem supports a plant and transports water to its other parts. Roots absorb water from the soil and anchor the plant, which is a related function but does not match the stem's role stated here.

5. What does each leaf do for a plant when it receives sunlight?

A. It makes seeds for the plant.

B. It makes food for the plant.

C. It transports water to the plant’s other parts.

D. It anchors the plant in the soil.

Answer: (B)

Explanation

In sunlight, each leaf makes food for the plant. Making seeds is the flower's function, while anchoring and transporting water are associated with roots and the stem.

6. Which plant part produces seeds?

A. The leaf makes seeds.

B. The flower makes seeds.

C. The stem makes seeds.

D. The root makes seeds.

Answer: (B)

Explanation

The flower makes seeds. Leaves make food in sunlight, roots anchor the plant and absorb water, and the stem supports the plant and transports water.

7. A plant receives water and air but grows poorly because its surroundings are too cold and dim. What does it need to grow and remain healthy?

A. Extra water and air, with warmth and light held very low.

B. Suitable amounts of warmth, water, light, and air.

C. More warmth and light, with water and air removed.

D. Suitable warmth and water, with light and air not needed.

Answer: (B)

Explanation

Plants need the right amounts of warmth, water, light, and air to grow and remain healthy. Providing more of two conditions while leaving other needed conditions inadequate would not meet the plant's full needs.

8. What happens at germination, the beginning of a seed’s growth?

A. A seed first makes flowers, then develops roots and stems.

B. A seed grows after its small shoots are replaced by mature roots and stems.

C. A seed with a food store and small root and stem shoots begins to grow.

D. A seed uses its food store to make leaves before any shoots form.

Answer: (C)

Explanation

Germination is the start of a seed's growth, and the seed contains a food store along with small root and stem shoots ready to grow. Flowering occurs later in a plant's development, rather than marking the start of germination.

9. Which path does water take through a flowering plant, and what happens to some of the water in its leaves?

A. It moves from the soil into the stem and then into the roots; flowers use it to make food and leaves retain it.

B. It enters through the flowers, travels down the stem, and collects in the roots; the leaves release it into the soil.

C. It moves from the soil into the roots, up the stem, and to the leaves and flowers; leaves use some to make food and release some into the air.

D. It moves from the leaves down the stem to the roots; the leaves store all of it for later growth.

Answer: (C)

Explanation

Water is absorbed from the soil by the roots and travels up the stem to leaves and flowers; leaves use some to make food and lose some to the air. Water does not enter the plant through its flowers and travel downward, as one distractor suggests.

10. What can happen to a plant that does not receive enough water?

A. It may produce more roots and become more resistant to heat.

B. It may wilt and die.

C. It may grow taller while its leaves become wider.

D. It may stop making flowers but remain healthy.

Answer: (B)

Explanation

A plant without enough water wilts and may die. Stopping flower production by itself is not the stated outcome of insufficient water.

11. A plant is moved from a mild environment into a place with extreme temperatures. What is the likely consequence?

A. The plant may adapt to either extreme without risk of dying.

B. The plant may be harmed by extreme cold but protected by extreme heat.

C. The plant may be harmed by extreme heat but protected by extreme cold.

D. The plant may be killed by extreme heat or extreme cold.

Answer: (D)

Explanation

A plant cannot survive extreme heat or extreme cold, and either can kill it. The idea that a plant can survive hot or cold places does not mean it can withstand extreme temperatures.

12. How should an investigation compare the effect of temperature on seeds across warm, room-temperature, and cold locations?

A. Sow five seeds in each of three pots, keep the soil watered, and observe and record the pots at the same time each day.

B. Sow five seeds in each of three pots, vary both temperature and watering, and record only the final results.

C. Sow five seeds in one pot at each temperature, leave the soil unwatered, and compare the pots after different intervals.

D. Sow different numbers of seeds in three pots, water them when they look dry, and record each pot at a different time.

Answer: (A)

Explanation

A fair investigation uses five seeds in each of three pots, keeps the soil watered, places them at the three temperatures, and records observations at the same time each day. Changing watering or observation intervals as well as temperature would make the comparison less controlled.

13. How can water reach leaves in a tree that is more than 80 metres tall?

A. It moves through a single wide channel in the trunk and enters leaves from the air.

B. It is carried from the roots by branches that contain broad open spaces.

C. It rises through the tree’s outer bark and reaches leaves through their surfaces.

D. It travels through many very narrow tubes in the tree’s main stem to every leaf.

Answer: (D)

Explanation

Water reaches every leaf through many very narrow tubes in the tree’s main stem, even in trees over 80 metres tall. The account does not describe a single wide channel as the route.

14. Which sequence describes how water is used in a flowering plant?

A. Water in the soil is absorbed by the leaves, travels down the stem, and is used by the roots and flowers; some roots lose water.

B. Water is absorbed by the roots, moves down the stem, and is used in the soil; flowers and leaves release it.

C. Water enters through the flowers, travels to the leaves, and then moves down to the soil; the stem releases it.

D. Water in the soil is absorbed by the roots, travels up the stem, and is used in the leaves and flowers; some leaves lose water.

Answer: (D)

Explanation

Water moves from the soil into the roots, up the stem, and into the leaves and flowers, with some leaving each leaf. The sequence does not begin with absorption through leaves or flowers.

15. Which comparison correctly describes how solids, liquids, and gases behave?

A. Solids take the shape of their container, liquids keep their shape, and gases gather at the bottom of the surrounding space.

B. Solids tend to keep their shape, liquids take the shape of their container, and gases spread to fill the surrounding space.

C. Solids and liquids keep their shapes, while gases change shape only when placed in a container.

D. Solids spread to fill the surrounding space, liquids keep their shape, and gases take the shape of their container.

Answer: (B)

Explanation

Solids tend to retain their shape, liquids adapt to their container, and gases spread through the space around them. Liquids, unlike solids, do not keep a fixed shape when poured into a container.

16. Why can carbon dioxide produced by mixing bicarbonate of soda and vinegar put out a candle flame?

A. The carbon dioxide can be poured onto the flame, which needs oxygen to burn.

B. The vinegar removes the candle’s fuel, while the bicarbonate increases the oxygen around it.

C. The carbon dioxide supplies extra oxygen, causing the flame to become too hot to continue.

D. The mixture produces nitrogen, which cools the candle until the wax can no longer burn.

Answer: (A)

Explanation

Mixing bicarbonate of soda with vinegar produces carbon dioxide, which can be poured onto a flame that needs oxygen to burn. The gas produced is not nitrogen, and the explanation is not that the mixture removes the candle’s fuel.

17. Two materials are mixed together, but each retains its original properties. What is this combination called?

A. A new compound

B. A mixture

C. A dissolved solid

D. A separated material

Answer: (B)

Explanation

A mixture forms when two or more materials are brought together without changing their properties. A new compound would involve materials combining into a substance with changed properties.

18. A mixture contains small gravel and larger stones. How does a sieve separate these materials?

A. The small gravel passes through the holes while the larger stones remain behind.

B. Both materials pass through because the sieve dissolves them.

C. The larger stones pass through the holes while the small gravel remains behind.

D. The sieve absorbs the small gravel while the larger stones remain behind.

Answer: (A)

Explanation

A sieve allows smaller pieces to pass through its holes while larger pieces are retained. The reversed arrangement is a common mix-up; it is the smaller pieces that pass through.

19. What distinguishes a soluble solid from an insoluble solid when each is added to a liquid?

A. A soluble solid dissolves in the liquid, while an insoluble solid does not.

B. A soluble solid can be filtered out, while an insoluble solid passes through a filter.

C. A soluble solid changes the liquid’s colour, while an insoluble solid does not.

D. A soluble solid sinks in the liquid, while an insoluble solid floats.

Answer: (A)

Explanation

Solubility describes whether a solid dissolves in a liquid: soluble solids dissolve and insoluble solids do not. Sinking or floating does not determine whether a solid is soluble.

20. Which method separates insoluble solid pieces from a liquid by allowing the liquid through while retaining the solid?

A. Smelting, heating the mixture until the liquid passes through

B. Sieving, using holes that are too small for the liquid

C. Filtration, using holes that are too small for the solid pieces

D. Dissolving, allowing the solid to pass through with the liquid

Answer: (C)

Explanation

A filter lets liquid pass through holes too small for the insoluble solid pieces, separating them. A sieve is generally used to sort solid pieces by size rather than to separate an insoluble solid from a liquid.

21. A manufactured material is made from a natural material. Where does the material ultimately come from?

A. From factories, which create materials without natural sources

B. From the atmosphere, which supplies all materials used by people

C. From recycling, which is the original source of manufactured materials

D. From Earth, which is the source of the materials people use

Answer: (D)

Explanation

Earth is the source of the materials people use, including manufactured materials made from natural materials. A factory may process or shape materials, but it is not their ultimate source.

22. Which pairing correctly identifies the sources of most plastic and of metals?

A. Most plastic comes from underground oil, while metals come from ores in rocks.

B. Both most plastic and metals come from underground oil.

C. Both most plastic and metals come from ores in rocks.

D. Most plastic comes from ores in rocks, while metals come from underground oil.

Answer: (A)

Explanation

Most plastic is made from oil found underground, whereas metals are made from ores found in rocks. The reversed pairing is a plausible confusion, but it swaps the sources.

23. How does smelting separate metal from other material in ore?

A. It heats and melts the ore to separate the metal.

B. It filters the ore so that metal pieces pass through a mesh.

C. It crushes the ore so that water carries away the metal.

D. It cools the ore until the metal separates from the other material.

Answer: (A)

Explanation

Smelting separates metal from other material in ore by heating and melting the ore. Crushing may break ore into smaller pieces, but it is not the separation process described here.

24. What happens when a carbon-containing fuel such as natural gas is burned?

A. It produces water vapour, which turns the fuel into an ore.

B. It produces carbon dioxide, which removes the cause of global warming.

C. It produces oxygen, which contributes to global warming.

D. It produces carbon dioxide, which contributes to global warming.

Answer: (D)

Explanation

Burning fuels such as natural gas, crude oil, petrol, and diesel produces carbon dioxide, which contributes to global warming. Burning does not produce oxygen as the stated warming-related product.

25. A cardboard cutout blocks a beam of light. What forms behind it?

A. A coloured image of the cardboard’s details, because it blocks light

B. A clear view of the light source, because the cardboard is opaque

C. A dark shadow, because the cardboard is opaque and blocks light

D. No shadow, because opaque objects let light pass through

Answer: (C)

Explanation

An opaque object blocks light, creating a dark area called a shadow. Transparent materials, unlike opaque cardboard, let light pass through.

26. Through which material can a person see objects clearly because it lets light pass through?

A. A rough material

B. A reflective material

C. A transparent material

D. An opaque material

Answer: (C)

Explanation

A transparent material lets light through and allows objects to be seen clearly. An opaque material blocks light rather than providing a clear view through it.

27. Which procedure would best test whether a material is opaque or transparent?

A. Predict its category, place it near a lamp, observe its color, and record the result.

B. Hold it against a window, compare its thickness, and record whether it bends.

C. Predict its category, shine a flashlight through it, observe whether light passes, and record the result.

D. Shine a flashlight onto it, measure its temperature, and record whether it feels warm.

Answer: (C)

Explanation

The test involves predicting a category, shining a flashlight through the material, observing light transmission, and recording the result. Observing its color near a lamp does not establish whether light passes through it.

28. A sheet of material allows light to pass through it. How should it be classified?

A. Opaque, because it changes the direction of light.

B. Transparent, because light can pass through it.

C. Transparent, because it blocks light from passing through it.

D. Opaque, because light can pass through it.

Answer: (B)

Explanation

Transparent materials let light pass through, while opaque materials do not. The plausible alternative that calls a light-blocking material transparent reverses these definitions.

29. What causes an object to cast a shadow?

A. It reflects light toward the light source.

B. It absorbs heat from the surface behind it.

C. It blocks light coming from a light source.

D. It produces light that reaches a nearby surface.

Answer: (C)

Explanation

A shadow forms when an object blocks light from a light source. Reflecting light toward the source is not the cause described for casting a shadow.

30. Which setup can be used to measure how a star's shadow changes with distance from a flashlight?

A. Make a 2 cm card star on a stick, hold the flashlight 30 cm from a tabletop, position the star 2 cm above it, then trace and measure the shadow.

B. Make a 2 cm card star on a stick, hold the flashlight 30 cm from a tabletop, position the star 30 cm above it, then trace and measure the shadow.

C. Make a 2 cm card star on a stick, hold the flashlight 30 cm from a tabletop, place the star on the table, then measure the star itself.

D. Make a 30 cm card star on a stick, hold the flashlight 2 cm from a tabletop, position the star 2 cm above it, then trace and measure the shadow.

Answer: (A)

Explanation

The investigation uses a 2 cm card star, a flashlight 30 cm from the tabletop, and a star positioned 2 cm above the table; the shadow is traced and measured. Raising the star to 30 cm changes the specified setup and would not follow this procedure.

31. A student moves an object closer to a light source. What happens to its shadow?

A. It gets smaller as the object moves toward the light.

B. It stays the same size as the object moves toward the light.

C. It gets larger as the object moves toward the light.

D. It disappears as the object moves toward the light.

Answer: (C)

Explanation

Moving an object toward a light source makes its shadow larger. The common reversal—that moving it toward the light makes the shadow smaller—confuses this effect with moving it away.

32. A species of animal eats both leaves and other animals. Which description fits its diet?

A. It eats plants but not animals.

B. It makes its own food using sunlight.

C. It eats animals but not plants.

D. It eats both plants and animals.

Answer: (D)

Explanation

Animals can be grouped by whether they eat plants, animals, or both, and this species eats both. Making food using sunlight describes a plant producer, not an animal with this diet.

33. Which description identifies a fossil?

A. A rock pattern formed without any connection to a living thing.

B. A drawing that shows what an ancient animal might have looked like.

C. An impression or remains of something that was once alive.

D. A model of an organism made by scientists.

Answer: (C)

Explanation

A fossil is an impression or remains of something that was once alive. A scientist-made model may represent an organism, but it is not itself a fossil.

34. How can hard parts of a dead animal become a fossil through the mud-and-rock process?

A. They press into mud, the mud copies their shape, and over time the mud turns to rock.

B. They press into rock, the rock copies their shape, and over time the rock turns to mud.

C. They remain on top of mud, the mud covers them without copying their shape, and the mud stays soft.

D. They dissolve in mud, the mud loses their shape, and over time the mud turns to sand.

Answer: (A)

Explanation

The hard parts press into mud, which copies their shape, and the mud eventually turns to rock. In the reversed alternative, rock forms first and then turns into mud, unlike the described process.

35. Which shape do Earth, the Sun, and the Moon all have?

A. A ball-like, spherical shape

B. An elongated, oval shape

C. An irregular, jagged shape

D. A flat, disk-like shape

Answer: (A)

Explanation

Each of these three bodies is spherical, meaning it has the shape of a ball. An oval is close to a sphere in some views, but it does not match the stated shape.

36. What does gravity do to objects near a massive body?

A. It pulls them toward the body's centre

B. It makes them move parallel to the body's surface

C. It pushes them away from the body's centre

D. It holds them at a fixed distance from the body's centre

Answer: (A)

Explanation

Gravity is a force that pulls objects toward the centre of an object. A force that pushes objects outward describes the opposite effect.

37. Two objects have different masses; what can be inferred about their gravity?

A. Only the more massive object has gravity, and the other has none

B. Both have gravity, but the less massive object has stronger gravity

C. Their gravity is equal because both objects have mass

D. Both have gravity, and the more massive object has stronger gravity

Answer: (D)

Explanation

Every object with mass has gravity, and greater mass corresponds to stronger gravity. The less massive object still has gravity, but it is not stronger for that reason.

38. How does gravity help explain why Earth, the Moon, and the Sun are spherical?

A. It pulls each body's material inward toward its centre

B. It pulls each body’s material toward the nearest other body instead of its own centre

C. It pushes each body's material outward into a rounded shell

D. It causes Earth’s material to move inward but leaves the Moon and Sun unchanged

Answer: (A)

Explanation

Gravity pulls matter toward each body's own centre, drawing Earth's material, the Moon's rock, and the Sun's gas inward. The alternative that gravity acts toward another body does not explain how each body is shaped by its own gravity.

39. What is the Moon’s orbit around Earth?

A. The Moon’s rotation around its own centre

B. The distance between the Moon and Earth at one moment

C. The circle along which the Moon moves around Earth

D. The path Earth follows while moving around the Moon

Answer: (C)

Explanation

The Moon's orbit is the circle along which it moves around Earth. Its rotation around its own centre is a different motion.

40. How long does the Moon take to orbit Earth?

A. About 13 days

B. One day

C. About 385 days

D. 29 days

Answer: (D)

Explanation

The Moon takes 29 days to orbit Earth. One day is the time associated with Earth's daily rotation, not the Moon's orbit.

41. Why does the fast-moving Moon remain in orbit around Earth?

A. Earth’s gravity continually pulls it toward Earth as it moves

B. The Moon stops moving whenever it approaches Earth

C. Earth’s rotation carries the Moon around it once each day

D. The Moon’s gravity pushes it away from Earth at a matching rate

Answer: (A)

Explanation

Earth's gravity continually pulls the fast-moving Moon toward Earth, keeping it in orbit. Earth's daily rotation does not carry the Moon around Earth.

42. In a scale model where every 1,000 km is represented by 1 cm, what model distance represents 385,000 km between Earth and the Moon?

A. 385 cm

B. 13 cm

C. 38.5 cm

D. 3.5 cm

Answer: (A)

Explanation

At 1 cm per 1,000 km, 385,000 km is represented by 385 cm. The 13 cm and 3.5 cm measurements represent the model diameters of Earth and the Moon, respectively.

43. What does the term “Moon phase” describe?

A. How the Moon looks from Earth at a particular time

B. The Moon’s surface temperature during its orbit

C. The time the Moon takes to complete an orbit

D. The Moon’s distance from Earth at a particular time

Answer: (A)

Explanation

A Moon phase describes the Moon's appearance as seen from Earth at a particular time. Its orbital duration is a separate characteristic, not its phase.

44. Why does the visible lighted portion of the Moon change as it moves around Earth?

A. The Sun lights half the Moon, and observers see different amounts of its light and dark halves

B. The Sun changes how much of the Moon it lights during each orbit

C. Earth’s shadow gradually covers the Moon as it circles Earth

D. The Moon produces more light as it moves closer to Earth

Answer: (A)

Explanation

The Sun lights the Moon's front half, while observers on Earth see different amounts of the light and dark halves as the Moon moves around Earth. The changing appearance is not explained by Earth's shadow gradually covering the Moon.

45. Which sequence names all eight Moon phases in order?

A. New moon, waning crescent, first quarter, waxing gibbous, full moon, waxing gibbous, last quarter, waning crescent

B. New moon, waxing crescent, first quarter, waning gibbous, full moon, waxing gibbous, last quarter, waning crescent

C. New moon, waxing crescent, last quarter, waxing gibbous, full moon, waning gibbous, first quarter, waning crescent

D. New moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, waning crescent

Answer: (D)

Explanation

The phases progress from new moon through the waxing phases to full moon, then through the waning phases back toward new moon. The alternative that begins with waning crescent disrupts the stated sequence after new moon.

46. A Moon’s visible lighted portion is getting smaller from night to night; what is happening to its phase?

A. It is becoming a gibbous Moon

B. It is waning

C. It is entering a first-quarter phase

D. It is waxing

Answer: (B)

Explanation

The Moon is waning when its visible lighted portion is getting smaller. Waxing describes the opposite change, when the visible lighted portion grows.

47. Why are standard units useful when people compare measurements made in different places?

A. They remove the need to record the unit alongside a measurement.

B. They let each region choose units that suit its local customs.

C. They provide consistent units that are understood across the world.

D. They make measurements more precise by using smaller increments.

Answer: (C)

Explanation

Standard units are understood across the world and do not change, making measurements easier to compare. Locally chosen units would not provide the same shared basis for comparison.

48. When measuring an object with a ruler whose zero mark is not at its end, what should you do to obtain a correct reading?

A. Align the zero mark with one end, then read the scale at eye level beside the object’s top.

B. Align the ruler’s end with one end, then read the scale from above the object.

C. Align the zero mark with the object’s midpoint, then read the scale at eye level.

D. Align the ruler’s end with the object’s top, then subtract the scale reading from its length.

Answer: (A)

Explanation

The ruler’s zero mark should be placed beside one end of the object, and the scale should be read with your eye level with the object’s top. Using the ruler’s physical end as the starting point can give an incorrect measurement when zero is set in from that end.

49. Which arrangement correctly presents measured results in both a results table and a bar chart?

A. Give the table a title and space for each result; give the chart bars and a title but leave its axes unlabelled.

B. Give the table a title and space for each result; give the chart a title, labelled axes with units, and bars for the table’s results.

C. Give the table a title and bars for each result; give the chart labelled axes without units and a results space.

D. Give the table labelled axes and bars; give the chart a title and a separate space for each result.

Answer: (B)

Explanation

A results table needs a title and space to record each result, while a bar chart needs a title, labelled axes with units, and bars representing the table’s results. A chart with unlabelled axes lacks required information for interpreting its values.