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Grade 6: Science subject test

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Subject practice test

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1. A sealed drawing contains separate nitrogen molecules and oxygen molecules. Neither reacts. What follows? Which inference or prediction is best supported?Only one substance exists because the container is sealed.It remains a mixture of two substances.Every molecule must become a new compound.Oxygen loses its element identity.

2. Supplied case 6: mass (g)=84; volume (cm³)=14, using the explicitly named quantities. Density equals mass in grams divided by volume in cubic centimeters. What result follows?6 g/cm³1176 g/cm³7 g/cm³5 g/cm³

3. Supplied case 6: density (g/cm³)=2.5; volume (cm³)=12, using the explicitly named quantities. Mass equals density in grams per cubic centimeter multiplied by volume in cubic centimeters. What result follows?0.20833333 g31 g29 g30 g

4. Only iron responds to the supplied magnet; the mixture also has sand and dissolved salt. What is warranted after the magnetic step? Which inference or prediction is best supported?All sand is removed with certainty.Every remaining substance becomes pure.Iron is removed; sand and dissolved salt remain.Salt is recovered as a pure solid.

5. A fungal cell has a nucleus but no chloroplast. Which inference is warranted? Which inference or prediction is best supported?It is eukaryotic; chloroplast absence does not prove an animal identity.It must be prokaryotic.It must be an animal because chloroplasts are absent.It cannot contain genetic information.

6. A green-cell model retains mitochondria but loses chloroplast light capture. What is supported? Which inference or prediction is best supported?Mitochondria automatically replace light capture.All respiration must stop in darkness.DNA disappears when chloroplasts fail.Photosynthesis is directly impaired; respiration may continue under suitable inputs.

7. A stomach diagram shows several tissue types contributing to one digestive role. What follows? Which inference or prediction is best supported?Each tissue is a complete digestive system.Multiple tissues cannot cooperate.The stomach is an organ containing multiple tissues.It is one tissue because it has one main role.

8. Two drawings share a 10 μm labeled reference bar, printed at different lengths. What comparison is justified? Which inference or prediction is best supported?The bars prove every cell is the same size.Use each bar’s ratio rather than comparing printed sizes alone.The larger printed bar represents more than 10 μm.Every drawing has identical magnification.

9. Two contacting bodies reach equal temperature in an isolated thermal model. What changes? Which inference or prediction is best supported?All particle motion stops.Both bodies must have equal masses.Every form of energy becomes zero.Net thermal transfer can balance while microscopic motion continues.

10. Energy from a warm surface reaches a detector across an ideal vacuum gap. What follows? Which inference or prediction is best supported?Conduction requires no interactions or medium.Vacuum blocks every energy transfer.Radiation can cross the gap without a material medium.Convection carries a fluid across the empty gap.

11. Supplied case 6: warmer temperature (°C)=45; cooler temperature (°C)=21, using the explicitly named quantities. Temperature difference equals warmer Celsius reading minus cooler Celsius reading. What result follows?23 °C24 °C66 °C25 °C

12. A matched wrapped cup cools less than its unwrapped control. Which explanation fits? Which inference or prediction is best supported?The wrap reduced net transfer in that setup, without creating energy.The wrap produced unlimited thermal energy.The experiment proves zero heat transfer.Temperature differences measure energy without mass or material information.

13. An oceanic plate approaches a trench and bends beneath another plate in the model. What follows? Which inference or prediction is best supported?A trench proves a transform-only boundary.No material can cross a boundary.Convergence can recycle crust into the deeper Earth.Both plates necessarily move apart.

14. A buried rock changes minerals under heat and pressure but never melts. What is warranted? Which inference or prediction is best supported?It becomes sediment only because pressure rose.Metamorphic change occurred in the solid-state model.It must be crystallization from magma.No rock change is possible without melting.

15. Supplied case 6: model rate (cm/year)=2.5; elapsed years=40, using the explicitly named quantities. Displacement in centimeters equals centimeters per year multiplied by years. What result follows?100 cm0.0625 cm101 cm99 cm

16. Seafloor ages increase from 2 to 8 to 20 million years away from a ridge. What mechanism fits? Which inference or prediction is best supported?Old crust must be created farthest away first.Age increases because the ridge moves no crust.The pattern alone fixes every plate’s exact history.New ridge crust moves outward and ages with time.

17. A radio transmitter sends a signal through ideal empty space. Which explanation fits? Which inference or prediction is best supported?Radio has a different vacuum speed solely because it is lower frequency.Electromagnetic waves can propagate without a material medium.A sound-like air vibration must carry it.Space needs water for every wave.

18. Supplied case 6: complete cycles=84; duration (s)=7, using the explicitly named quantities. Frequency equals complete cycles divided by seconds. What result follows?12 Hz588 Hz13 Hz11 Hz

19. A ray passes through clear glass; a small component also returns at its surface. What follows? Which inference or prediction is best supported?Transparency means absolutely no reflection.The passing component must be sound.All incident energy must be absorbed.Transmission and reflection can coexist.

20. A receiver knows that short-long-short means HELP; the sender changes it to short-short-short. What follows? Which inference or prediction is best supported?Every pulse pattern has the same meaning.Frequency measures all semantic content automatically.The message interpretation can change even if wave speed is unchanged.Wave speed alone restores HELP.

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