Physical Science: Ch 6-8 Multiple Choice

A moving observer approaches a stationary sound source. What does the observe hear? a) an increase in frequency b) a decrease in frequency c) the same frequency as the source

a) an increase in frequency

In refraction, which of the following wave properties is unchanged? a) frequency b) wavelength c) speed d) both a and b

a) frequency

If a piece of ribbon were tied to a stretched string carrying a transverse wave, then how is the ribbon observed to oscillate? a) perpendicular to wave direction b) parallel to wave direction

a) perpendicular to wave direction

The greatest equivalent resistance occurs when resistance are connected in which type of arrangement? a) series b) parallel c) series-parallel

a) series

When does total constructive interference occur? a) when waves are in phase b) at the same time as total destructive interference c) when the waves are equal in amplitude and are completely out of phase d) when total internal reflection occurs

a) when waves are in phase

In a dc circuit, how do electrons move? a) with a slow drift velocity b) in alternate directions c) near the speed of light d) none of the preceding

a) with a slow drift velocity

Which is true for a real image? a) It is always magnified b) It is formed by converging light rays c) It is formed behind a mirror d) It occurs only for Di = Do

b) It is formed by converging light rays

A transformer with more windings on the primary coil than on the secondary coil does which of the following? a) Steps up the voltage b) Steps up the current c) Steps up both current and voltage d) Will operate off dc current

b) Steps up the current

What is the case when the angle of refraction is smaller than the angle of incidence? a) The critical angle is exceeded b) The first medium is less dense c) The second medium has a smaller index of refraction d) The speed of light is greater in the second medium

b) The first medium is less dense

What is a unit of voltage? a) joule b) joule/coulomb c) amp-coulomb d) amp/coulomb

b) joule/coulomb

A wave with particle oscillation parallel to the direction of propagation is a(n): a) transverse wave b) longitudinal wave c) light wave

b) longitudinal wave

What type of energy conversion does a generator perform? a) chemical energy into mechanical energy b) mechanical energy into electrical energy c) electrical energy into mechanical energy d) mechanical energy int chemical energy

b) mechanical energy into electrical energy

What is the unit of the index of refraction? a) m b) none; it is unitless c) m/s d) l/s

b) none; it is unitless

Given three resistances, the greatest current occurs in a battery circuit when the resistances are connected in what type of arrangement? a) series b) parallel c) series-parallel

b) parallel

Which of the following properties does not change in the Doppler effect? a) wavelength b) speed c) frequency d) period

b) speed

Which is true of a convex mirror? a) It has a radius of curvature equal to f b) It is converging mirror c) It forms only virtual images d) It forms magnified and reduced images

c) It forms only virtual images

Which of the following is true of a step-up transformer? a) It has an equal number of windings on the primary and secondary coils b) It has fewer windings on the secondary coil c) It has fewer windings on the primary coil d) None of the preceding statements is true

c) It has fewer windings on the primary

Which is true of a virtual image? a) It is always formed by a convex b) It can be formed on a screen c) It is formed on the object side of a lens d) It cannot be formed by a concave lens

c) It is formed on the object side of a lens

Which of the following is true of a concave lens? a) It is a converging lens b) It is thicker at the center than at the edge c) It is lens that forms virtual images for Do>f d) It is a lens that forms real images for Do>f

c) It is lens that forms virtual images for Do>f

Two equal positive charges are placed equidistant on either side of another positive charge. What would the middle positive charge experience? a) a net force to the right b) a net force to the left c) a zero net force

c) a zero net force

What type of energy conversion does a motor perform? a) chemical energy into mechanical energy b) mechanical energy into electrical energy c) electrical energy into mechanical energy d) mechanical energy into chemical energy

c) electrical energy into mechanical energy

The speed of sound is generally greatest in _______. a) gases b) liquids c) solids d) vacuum

c) solids

A sound with an intensity level of 30 dB is how many times louder than the threshold of hearing? a) 10 b) 3000 c) 100 d) 1000

d) 1000

For ray reflections from a surface, which statement is true? a) The angle of reflection is equal to the angle of incidence b) The reflection angle is measured from a line perpendicular to the reflecting surface c) The rays lie in the same plane. d) All the preceding are true.

d) All the preceding are true

Which of all the following is true for electromagnetic waves? a) They have different speeds in vacuum for different frequencies b) They are longitudinal waves c) They require a medium for propagation d) None of the above

d) None of the above

Which of the following occur(s) when a stretched string is shaken at one of its natural frequencies? a) standing waves b) resonance c) maximum energy transfer d) all of the preceding

d) all of the preceding

To what does the law of reflection apply? a) regular reflection b) specular reflection c) diffuse reflection d) all the preceding

d) all the preceding

In electrical terms, power has what units? a) joule/coulomb b) amp/ohm c) amp-coulomb d) amp-volt

d) amp-volt

When two bar magnets are near each other, the north pole of one of the magnets experiences what type of force from the other magnet? a) an attractive force b) a repulsive force c) a Coulomb force d) both a and b

d) both a and b (an attractive force and a repulsive force)

Which one of the following regions has frequencies just slightly less than the visible region in the electromagnetic frequency spectrum? a) radio wave b) ultraviolet c) microwave c) infrared

d) infrared

What can be said about the electric force between two charged particles? a) it is repulsive for unlike charges b) it varies as l/r c) it depends only on the magnitudes of the charges d) it is much, much greater than the attractive gravitational force

d) it is much, much greater than the attractive gravitational force

What is the variation in the location of the Earth's magnetic north pole from true north given by? a) the law of poles b) the magnetic field c) magnetic domains d) the magnetic declination

d) the magnetic declination

Which of the following sound frequencies would not be heard by the human ear? a) 25 Hz b) 900 Hz c) 20 kHz d) 25kHz

a) 25 Hz

How fast do electromagnetic waves travel in vacuum? a) 3.00 X 10^8 m/s b) 9.8 m/s^2 c) 344 m/s d) 3.44 X 10^6 m/s

a) 3.00 X 10^8 m/s

Which is true of diffraction? a) It occurs best when the slit width is less than the wavelength of a wave b) It depends on refraction c) It is caused by interface d) It does not occur for light

a) It occurs best when the slit width is less than the wavelength of a wave

What happens when the polarization directions of two polarizing sheets are at an angle of 90 degrees to each other? a) No light gets through b) There is maximum transmission c) Maximum transmission is reduced by 50% d) None of the preceding

a) No light gets through

If an astronomical light source were moving toward us, then what would be observed? a) a blueshift b) a shift toward longer wavelengths c) a shift toward lower frequencies d) a sonic boom

a) a blueshift

Appliances with heating elements require which of the following? a) a large current b) a large resistance c) a low joule heat

a) a large current

The energy of a wave is related to the square of which of the following? a) amplitude b) frequency c) wavelength d) period

a) amplitude