Online Access Free Integrated-Physical-Sciences Exam Questions

Why do comets develop tails when they are near the Sun?

• A.The combustion of flammable compounds in its atmosphere
• B.The increasing velocity as the comet approaches the Sun
• C.The evaporation of ice and the release of dust particles
• D.The increasing rate of debris impacts as the comet approaches the Sun

A scientist wants to determine how the speed of flowing water affects the size of sediment particles it can carry. The scientist places a mix of sediment particles in the bottom of a trough and runs water through the trough. The scientist varies the speed of the water and measures the sizes of the particles that the water carries away.
Which type of investigation is the scientist using?

• A.Field study
• B.Observational study
• C.Computational model
• D.Controlled experiment

In 1996, NASA scientists claimed that a Martian meteor contained chemical compounds that indicated life on Mars 3.6 billion years ago. However, further studies showed that the same chemical compounds were found in rocks from the Moon, where no life ever existed.
What is the appropriate scientific approach for dealing with this contradiction?

• A.Conclude that there must have been life on the Moon at some time in the past
• B.Determine that the chemical compounds that were found do not necessarily indicate life
• C.Accept the idea that there has been life on Mars because the scientists worked for NASA
• D.Decide that life could never have existed on Mars because the chemicals are also found on the Moon

A student makes the diagram of the rock cycle that is shown here
Which description should the student place on arrow B?

• A.Heat and pressure
• B.Erosion and deposition
• C.Melting and cooling
• D.Uplift and compression

A water molecule consists of two hydrogen atoms bonded to an oxygen atom.
Which type of substance is water?

• A.Element
• B.Isotope
• C.Compound
• D.Mixture