Physical Science test 2

the watt, in the unit of power, is equal to the

(volt)(ampere)

molecular motion in a gas is the minimum possible at

0 K

a changing electric field gives rise to

a magnetic field

the image a camera lens forms on the film or sensor is

always real

when a current passes through a resistance, the electric energy that is lost

becomes heat

when a magnetized bar is strongly heated, its magnetic field

becomes weaker

light of which of the following colors has the highest frequency

blue

the freezing point of a substance is always lower than its

boiling point

heat transfer in a vacuum

can take place only by radiation

the nucleus of an atom

contains most of the atoms mass

an object has a positive electric charge whenever

iit has deficiency of electrons

Heat transfer by conduction occurs

in liquids, solids, and gases

relative to its objects, a real image formed by a lens is always

inverted

molecules are, in general, farthest apart from one another in

gases

when a liquid becomes a vapor

it must absorb heat

the temperature of a gas sample in a rigid container is reduced. The pressure the gas exerts on the container walls decreases because

its molecules have lower average speeds and so strike the walls less often with less momentum

When heat is added to a body of matter, the resulting temperature increase does not depend upon

its shape

a compass needle tends to

line up parallel to a magnetic field

the amplitude of a sound wave determines its

loudness

electric charge

occurs only in seperate parcels of 1.6 * 10^-19 C

in a transverse wave, the individual particles of the medium move

perpendicular to the direction of travel

a molecule that has lost an electron becomes a

positive ion

the volt is the unit of electric

potential difference

which of the following statements is not true

protons and electrons have equal masses

a pure musical note causes thin wood panel nearby to vibrate with the same frequency. This is an example of

resonance

a samples of a gas is expanded to twice its original volume while its temperature is held constant. relative to their original average energy, the new average energy of the molecules is

the same

the higher the frequency of a wave

the shorter its wavelength

a molecule is best described as

the smallest particle of a substance that is representative of the substance

sublimation refers to

the vaporization of a solid without first becoming a liquid

the image formed by a diverging lens of a real object is always which of the following?

virtual

relative to the electric force between two protons, the gravitational force between them is

weaker

ultrasound refers to sound whose

frequency is too high for most people to hear

the average pressure of the atmosphere at sea level corresponds to which one or more of the following

101 kpa and 101 * 10^3 N/m^2

a celsius thermometer and an absolute thermometer are used to measure the temperature of the same gas sample. The reading on the thermometers are respectively Tc and Tk. which is correct?

Tc is smaller than Tk

the properties of several different materials are being compared. if the samples all have the same volume, the one with the greatest mass also has the greatest

density

the bending of waves around the edge of an obstacle in their path is an example of

diffraction

atoms and molecules are normally

electrically neutral

when waves go from one place to another, they carry

energy

an example of a purely longitudinal wave is a

sound wave

what wave cannot travel through a vacuum

sound waves

dispersion is the term used to describe the

splitting of white light into its component colors in refraction

when a gas is forced into a smaller volume without a change in temperature, its pressure increases because its molecules

strike the container walls more often