PHY for ENG 1

Question 1

One slug is equivalent to how many kg?

A. 13.2 kg
B. 15.5 kg
C. 12.8 kg
D. 14.6 kg

Answer 1

D. 14.6 kg

1 slug = 14.6 kg
1 kg =1000 grams
1 kg = 2.2046 pounds 1 ounce = 28.35 grams 1 pound = 16 ounces
1 ton = 2000 pounds
1 ton = 907.19 kg
1 metric ton = 1000 kg

Question 2

When the sound wave goes from air into
water, the quantity that remains
unchanged is its_.

A. speed
B. frequency
C. wavelength
D. amplitude

Answer 2

B. frequency

When the sound wave goes from air into
water, the quantity that remains
unchanged is its frequency.

Question 3

An object closer to converging lens than its focal point always has an image that is

A. the same in size
B. smaller in size
C. virtual
D. inverted

Answer 3

C. virtual

(P4Eng1 FIGURE)

Question 4

Doubling the distance between the
center of an orbiting satellite and the
center of the earth will result in what
change in the gravitational attraction of
the earth for the satellite?

A. one-half as much
B. twice as much
C. one-fourth as much
D. four times as much

Answer 4

C. one-fourth as much

(P4Eng1 FIGURE)

Question 5

In calculating the upward force required to lift an object, it is necessary to use g if the mass is given in kg. The quantity of g is not needed if the weight is given in Ib because:

A. a kilogram is a unit of weight
B. a pound is defined as a measure of
force, a kilogram is not
C. the rules of measurement are different in
English system
D. the symbol for metric mass has the letter
“g” in it and the symbol for pound does not

Answer 5

B. a pound is defined as a measure of
force, a kilogram is not

In calculating the upward force required to lift an object, it is necessary to use g if the mass is given in kg. The quantity of g is not needed if the weight is given in Ib because a pound is defined as a
measure of force, a kilogram is not.
1 lbf = 4.4482 Newtons
1 Newton = 10,000 dynes

Question 6

The work done by all forces except the
gravitational force is always equal to the
_____ of the system.

A. total mechanical energy
B. total momentum
C. total kinetic energy
D. total potential energy

Answer 6

C. total kinetic energy

The work-energy theorem states that
the work done on an object by the net
force is equal to the change in its kinetic
energy. Wnet = ∆K. E.

Question 7

According to this law, “The force
between two charges varies directly as
the magnitude of each charge and
inversely as the square of the distance
between them.”

A. Law of Universal Gravitation
B. Coulomb’s Law
C. Newton’s Law
D. Kepler’s Law

Answer 7

B. Coulomb’s Law

“The force between two charges varies directly as the magnitude of each charge and inversely as the square of the distance between them.”
This is known as Coulomb’s Law.

Ohm’s Law states that the current
flowing in an electrical circuit is
directly proportional to the applied
voltage (V) and inversely proportional to the equivalent resistance (R).

Kirchoff’s Current Law (KCL) states
that the Algebraic Sum of the
currents entering and leaving any
node or junction is equal to zero.

Kirchoff’s Voltage Law (KVL) states
that the Algebraic Sum of the
voltage drops and the supply voltage in a closed path or loop is zero.

Ampere’s law states that the sum
over elements of the component of
the magnetic field along the direction of the element, times the element length, is proportional to the current I that passes through the loop.

Question 8

It describes the luminous flux incidence per unit area and is expressed in lumens per square meter.

A. Radiance
B. Candela
C. Illuminance
D. Luminous Intensity

Answer 8

C. Illuminance

Illuminance is defined as the luminous
flux per unit area that reaches it. The
more luminous flux that reaches the
surface, the brighter it is lit.
Candela is the unit of luminous
intensity.
Luminous intensity is the candle power
of a source in any given direction. It is
equal to the luminous flux radiated per
unit solid angle in a direction.

Question 9

The energy stored in s stretched elastic
material such as spring is

A. kinetic energy
B. internal energy
C. mechanical energy
D. elastic potential energy

Answer 9

D. elastic potential energy

(P4Eng1 FIGURE)

Question 10

When the pitch of a note is raised,

A. its frequency decreases
B. its wavelength is increased
C. its frequency increases
D. None of these choices

Answer 10

C. its frequency increases

When the pitch of a note is raised its
frequency increases. Pitch is the
attribute of auditory sensation in terms
of which sound may be ordered on a
scale primarily related to frequency.

Question 11

Which of the following is not true about
sound waves?

A. they travel faster in air than in solids
B. they produce interference
C. they are propagated as series if
compressions and rarefactions
D. they transmit energy

Answer 11

A. they travel faster in air than in solids

Molecules of in solids are packed
together tighter than in liquids and
gases, hence sound travels faster in
solids than in air.

Question 12

Modern physics theories state that the
proton and neutron are made up of
these fundamental particles.

A. Quarks
B. Neutrinos
C. Muons
D. Photons

Answer 12

A. Quarks

Modern physics theories state that the
proton and neutron are made up of
quarks. All matter is made up of
fermions, classified into six kinds of
leptons and six kinds of quarks.

Question 13

Sound waves in air are

A. either longitudinal or transverse
B. longitudinal
C. stationary
D. transverse

Answer 13

B. longitudinal

Sound waves are disturbances or
vibration whose energy must be
communicated into a medium. It is an
example of a longitudinal mechanical
wave that can travel through solid, liquid
or gas.

Question 14

Normal range of the frequency of sound,
which the human beings can hear

A. less than 20 Hz
B. 20 Hz to 20 kHz
C. all of these choices
D. more than 25 kHz

Answer 14

B. 20 Hz to 20 kHz

Sonic waves are waves that can be
heard by human ear. These are waves
with frequencies from 20 Hz 20,000 Hz.

Question 15

A wave in which the particles of the
material move up and down as the wave
goes from left to right is called:

A. longitudinal wave
B. standing wave
C. transverse wave
D. none of these choices

Answer 15

C. transverse wave

A wave in which the particles of the
material move up and down as the wave
goes from left to right is called
transverse wave.
Transverse waves are waves in which the vibration direction is perpendicular to the direction of the wave
propagation. Examples are wave on
string, water waves and
electromagnetic waves (light and radio
waves).

Question 16

When waves go from one place to
another, they transport

A. energy only
B. frequency only
C. wavelength and matter
D. energy and matter

Answer 16

A. energy only

When waves go from one place to
another, they transport energy only.
Waves such as sound or light cannot
are not capable of transporting matter.

Question 17

Echo is formed as a result of

A. refraction of sound
B. interference of sound
C. reflection of sound
D. diffraction of sound

Answer 17

C. reflection of sound

Echo is a reflected sound. Sound, like
light waves, can be reflected back when
it strikes a surface.

Question 18

A decibel is a

A. measure of intensity level
B. musical instrument
C. measure of clarity of sound
D. highest frequency emitted by a tuning fork

Answer 18

A. measure of intensity level

A decibel is a measure of intensity
level.

Where:
SIL = sound intensity level in dB
I= sound intensity in W/m?
lo = minimum intensity for hearing

(P4Eng1 FIGURE)

Question 19

What is another term for vector product
of two vectors?

A. Plus product
B. Vector product
C. Cross product
D. Dot product

Answer 19

C. Cross product

The vector product or cross product
of two vectors à and E is written Ã
× E and has magnitude equal to
the scalar quantity

(P4Eng1 FIGURE)

Question 20

The scalar product of two perpendicular
vector is always _____

A. Equal to 1
B. Greater than 1
C. Equal to 0
D. Less than 1

Answer 20

C. Equal to 0

The
scalar product of two perpendicular vector is always equal to 0.
For perpendicular vectors, the angle
between them θ=90°.

(P4Eng1 FIGURE)

Question 21

lron is what type of magnetic material?

A. diamagnetic
B. ferromagnetic
C. paramagnetic
D. non-magnetic

Answer 21

B. ferromagnetic

Ferromagnetic materials have relative permeability very much greater than 1.Common materials: iron, nickel, cobalt,ALNICO, permalloys, ferrites, and
magnetic oxides.

Question 22

For a parallel-plate capacitor with plate
area “A” and plate separation “d”, the
capacitance is proportional to which of
the following?

A. A divided by d
B. d divided by A
C. A times d
D. A divided by d squared

Answer 22

A. A divided by d

Where:
C = Capacitance in Farad
A = area of each plate in sq. meters
d = distance between plates
k = permittivity of the material

(P4Eng1 FIGURE)

Question 23

A standing wave is formed on a tightly stretched string. The distance between a node and an antinode is:

A. 1/2 wavelength
B. 1/8 wavelength
C. 1/4 wavelength
D. 1 wavelength

Answer 23

C. 1/4 wavelength

(P4Eng1 FIGURE)

Question 24

When a physical property such as
charge exists in discrete “packets”
rather than in continuous amounts, the
property is said to be:

A. abrupt
B. non-continuous
C. quantized
D. discontinuous

Answer 24

C. quantized

When a physical property such as
charge exists in discrete “packets”
rather than in continuous amounts, the
property is said to be quantized.

Question 25

A virtual image can be formed by one or more of the following single mirrors? Identify them. A. plane mirror B. concave spherical mirror C. all of these choices D. convex spherical mirror

Answer 25

C. all of these choices Virtual images occur where light rays only appear to have originated. A virtual image can be formed by plane mirror or spherical mirror.

Question 26

The wave nature of light is demonstrated by which of the following? A. the photoelectric effect B. color C. diffraction D. the speed of light

Answer 26

C. diffraction The wave nature of light is demonstrated by diffraction. Diffraction is the scattering or spreading of light waves as they pass around the edge or a small opening.

Question 27

The collision between a photon and a free electron was first explained by which of the following scientists? A. Heisenberg B. Compton C. Bohr D. Einstein

Answer 27

B. Compton The American physicist Arthur Holly Compton explained (1922; published 1923) the wavelength increase by considering X-rays as composed of discrete pulses, or quanta, of electromagnetic energy.

Question 28

The Tesla and the Gauss are units of measure of: A. magnetic flux B. conductance C. magnetic field strength D. electrical current

Answer 28

C. magnetic field strength The Tesla and the Gauss are units of measure of magnetic flux density B. One Tesla (T) corresponds to 10 Gauss.

Question 29

G, the universal gravitational constant, was measured experimentally by: A. Cavendish B. Copernicus C. Newton D. Kepler

Answer 29

A. Cavendish The value of G was experimentally determined by Lord Henry Cavendish using a torsion balance. G = 6.673 x 10 N-m/kg.

Question 30

The unit for the spring constant is A. J B. NS C. Nm D. N/m

Answer 30

D. N/m Hooke's Law in spring Where: F = external force k = spring constant in N/m x = elongation in m

Question 31

The unit for the period is A. T B. s C. m*s D. /s

Answer 31

B. s Period is the time it takes for one complete cycle. Second (s) is the Sl unit for time.

Question 32

As a longitudinal wave moves through a medium, the particles of the medium: A. vibrate in a path perpendicular to the path of the wave B. vibrate in a path parallel to the path of the wave C. follow the wave along its entire path D. do not move

Answer 32

B. vibrate in a path parallel to the path of the wave Longitudinal waves are waves in which the vibration direction is parallel to the direction of propagation.

Question 33

Two vibrating particles that are "out of phase" differ in the phase of their vibration by: A. 1/4 cycle B. 1/2 cycle C. 3/4 cycle D. 1 cycle

Answer 33

B. 1/2 cycle (P4Eng1 FIGURE)

Question 34

An electroscope charged without contacting a charged body is charged by: A. insulation B. convection C. induction D. conduction

Answer 34

C. induction An electroscope charged without contacting a charged body is charged by induction. Electromagnetic or magnetic induction is the production of an electromotive force across an electrical conductor in a changing magnetic field. Michael Faraday is generally credited with the discovery of induction in 1831, and James Clerk Maxwell mathematically described it as Faradays law of induction.

Question 35

The potential drop between the terminals of a battery is equal to the battery's EMF when: A. no current is drawn from the battery B. the internal resistance of the battery is very large C. a very large current is drawn from the battery D. the resistance in the external circuit is small

Answer 35

A. no current is drawn from the battery The potential drop betweenthe terminals of a battery is equal to the battery's EMF when no current is drawn from the battery. Take for example the circuit shown: (P4Eng1 FIGURE) The total voltage drop across the external circuit equals the battery voltage as the charge moves from the positive terminal back to 0 volts at the negative terminal.

Question 36

Two light rays will interfere constructively with maximum amplitude if the path difference between them is: A. one-half wavelength B. one-quarter wavelength C. one-eighth wavelength D. one wavelength

Answer 36

D. one wavelength Pure constructive interference is obtained when identical waves are in phase. Pure destructive interference occurs when identical waves are exactly out of phase, or shifted by half a wavelength.

Question 37

An interferometer constructed using a half-silvered mirror inclined at a 45- degree angle to the incoming beam A. Michelson Interferometer B. Spectrometer C. Multiple Reflection Interferometer D. Beam Splitter

Answer 37

A. Michelson Interferometer The Michelson interferometer (invented by the American physicist Albert A. Michelson,1852-1931) is a precision instrument that produces interference fringes by splitting a light beam into two parts and then recombining them after they have traveled different optical paths. (P4Eng1 FIGURE)

Question 38

The Michelson interferometer was designed to study the nature of: A. sound waves B. sunlight C. water waves D. ether

Answer 38

D. ether The Michelson interferometer is employed in many scientific experiments and became well known for its use by Albert Michelson and Edward Morley in the famous Michelson-Morley experiment (1887) in a configuration which would have detected the earth's motion through the supposed ether that most physicists at the time believed was the medium in which light waves propagated. The null result of that experiment essentially disproved the existence of such an ether.

Question 39

The Millikan experiment showed that electric charge was: A. positive B. immeasurable C. negative D. quantized

Answer 39

D. quantized In 1923 Millikan received the prestigious Nobel Prize for Physics for his work with the quantization of charge and Plank's constant. Millikan's experiment showed that electrical charge is quantized, meaning that charge exists only in little "pieces" of definite size.

Question 40

When a metal becomes a superconductor, there is a tremendous decrease in its: A. density B. electrical resistance C. total volume D. length

Answer 40

B. electrical resistance A superconductor is a substance that conducts electricity without resistance when it becomes colder than a "critical temperature."

Question 41

An x-ray photon collides with a free electron, and the photon is scattered. During this collision there is conservation of: A. momentum but not energy B. both momentum and energy C. energy but not momentum D. neither momentum nor energy

Answer 41

B. both momentum and energy An x-ray photon collides with a free electron, and the photon is scattered. During this collision there is conservation of both momentum and energy. Law of conservation of momentum states that when two bodies collide, the total momentum before impact is equal to the total momentum after impact. Law of conservation of energy states that energy can neither be created nor destroyed but it can be transformed.

Question 42

Alpha particles are nuclei of: A. oxygen B. helium C. nitrogen D. hydrogen

Answer 42

B. helium Alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together, thus having a mass of four units and a positive charge of two.

Question 43

The unit for frequency is A. s B. /m C. s D. Hz

Answer 43

D. Hz Frequency is the number of times an event occurs in a period of time. The SI unit of frequency is Hertz (Hz), named after the physicist Heinrich Hertz who demonstrated that the electromagnetic waves predicted by James Clerk Maxwell actually exist.

Question 44

Which of the answers listed below best completes the statement: The rate at which any part of a wave travels from one place to another determines the wave's: A. period B. propagation velocity C. frequency D. amplitude

Answer 44

B. propagation velocity The rate at which any part of a wave travels from one place to another determines the wave's propagation velocity. Frequency is the number of times an event occurs in a period of time. Period is the time it takes for one complete cycle in seconds. Amplitude is the height as depicted on a graph of a wave over time. An amplitude measurement can take the form of peak, peak-to-peak, average, or RMS quantity.

Question 45

When a charge moves through an electric circuit in the direction of an electric force it does which one of the following four things? A. lose potential energy and gain kinetic energy B. gain potential energy and lose kinetic energy C. gain both potential and kinetic energy D. lose both potential and kinetic energy

Answer 45

A. lose potential energy and gain kinetic energy

Question 46

Two waves of equal wavelength will interfere destructively most effectively under one of the following conditions.Will the interference be most effective when the waves are: A. in phase and have equal amplitudes B. 180 degrees out of phase and have equal amplitudes C. 180 degrees out of phase and have unequal amplitudes D. in phase and have unequal amplitudes

Answer 46

B. 180 degrees out of phase and have equal amplitudes Pure constructive interference is obtained when identical waves are in phase. Pure destructive interference occurs when identical waves are exactly out of phase, or shifted by half a wavelength.

Question 47

A solid conducting sphere is given a positive charge Q. How is the charge Q distributed in or on the sphere? A. It is concentrated at the center of the sphere B. Its density decreases radially outward from the center C. It is uniformly distributed on the surface of the sphere only D. It is uniformly distributed throughout the sphere

Answer 47

C. It is uniformly distributed on the surface of the sphere only The charge Q in sa solid conducting spher is uniformly distributed on its surface.

Question 48

One joule of work is needed to move one coulomb of charge from one point to another with no change in velocity.Which of the following is true between the two points? A. The resistance is one ohm B. The potential difference is one volt C. The electric field strength is one newton D. The current is one ampere

Answer 48

B. The potential difference is one volt A potential of one volt has the capacity to do one joule of work in moving one coulomb of charge.

Question 49

What law describes the force between two stationary electrically charged objects? A. Ampere's law B. Ohm's law C. Coulomb's law D. Kirchhoff's Rules

Answer 49

D. Kirchhoff's Rules

Question 50

The unit for wavelength is A. /m B. m/s C. m*s D. m

Answer 50

D. m Wavelength is the distance (in meters) traveled by an electromagnetic wave during the time of one cycle.

Question 51

The energy associated with a photon depends upon the photon's: A. velocity B. amplitude C. the brightness of the source from which it comes D. frequency

Answer 51

D. frequency When making the transition from one energy level to another, the atom absorbs or emits a packet of energy called a photon. (P4Eng1 FIGURE)

Question 52

When a fast charged particle traverses a dielectric medium at a velocity exceeding the velocity of light in that medium, radiation is emitted. This radiation is known as: A. Synchrotron radiation B. point radiation C. Cherenkov radiation D. Bremsstrahlung

Answer 52

C. Cherenkov radiation Cherenkov radiation is electromagnetic radiation emitted when a charged particle passes through a dielectric medium at a speed greater than the phase velocity of light in that medium.

Question 53

If viewed on an oscilloscope, the loudness of a sound wave would be associated with the wave's: A. velocity B. frequency C. wavelength D. amplitude

Answer 53

D. amplitude If viewed on an oscilloscope, the loudness of a sound wave would be associated with the wave's amplitude. The higher the amplitude, the louder the sound.

Question 54

The kinetic energy of a stone falling near the earth's surface through a vacuum increases with the: A. square root of its velocity B. cube of its velocity C. square of its velocity D. cube root of its velocity

Answer 54

C. square of its velocity Kinetic energy is the energy possessed by an object because of its motion. (P4Eng1 FIGURE)

Question 55

Which of the following does not travel in a vacuum? A. radio waves B. gamma rays C. sound waves D. magnetic waves

Answer 55

C. sound waves Sound waves are disturbances or vibration whose energy must be communicated into a medium. It is an example of a longitudinal mechanical wave that can travel through solid, liquid or gas.

Question 56

An incident ray comes in parallel to the principle axis of a concave mirror. It is reflected: A. through the center of curvature B. back along the incident ray C. through the focal point D. at 30 degrees to incident ray

Answer 56

C. through the focal point In concave mirrors, light rays parallel to the principal axis will be reflected through the focus. In reverse, light rays passing through the focus will be reflected parallel to the principal axis. (P4Eng1 FIGURE)

Question 57

charges "positive" and "negative"? A. James Chadwick B. J. J. Thompson C. Benjamin Franklin D. Ernest Rutherford

Answer 57

C. Benjamin Franklin It was Benjamin Franklin who named the two kinds of electricity 'positive' and negative'. He even collected electric charges from thunderstorm clouds through wet string from a kite.

Question 58

What SI prefix is used to represent 10^-18? A. zepto B. exa C. atto D. zetta

Answer 58

C. atto (P4Eng1 Table)

Question 59

Sound waves are an example of what type of wave? A. compressional and longitudinal B. transverse C. compressional D. longitudinal

Answer 59

A. compressional and longitudinal Sound waves are disturbances or vibration whose energy must be communicated into a medium. It is an example of a longitudinal mechanical wave that can travel through solid, liquid or gas.

Question 60

Two parallel wires carrying currents in opposite directions will: A. attract each other B. not affect each other C. cause an electric arc to form D. repel each other

Answer 60

D. repel each other The direction is obtained from the right hand rule. Note that two wires carrying current in the same direction attract each other, and they repel if the currents are opposite in direction.

Question 61

What are the units for intensity? A. W/m B. J C. decibels D. J/m

Answer 61

A. W/m Intensity is the power carried by the wave through a unit area perpendicular to the direction of propagation of the vibrating body. It has a unit of W/m.

Question 62

The four underlying equations in electromagnetic theory are called: A. Newton's Equations B. Maxwell's Equations C. Faraday's Law D. Einstein's Equations

Answer 62

B. Maxwell's Equations Maxwell's equations are a set of coupled partial differential equations that, together with the Lorentz force law, form the foundation of classical electromagnetism, classical optics, and electric circuits.

Question 63

Which of the following phenomena suggest that light may be a transverse wave? A. diffraction B. polarization C. reflection D. photoelectric effect

Answer 63

B. polarization Polarization is a property applying to transverse waves that specifies the geometrical orientation of the oscillations. In a transverse wave, the direction of the oscillation is perpendicular to the direction of motion of the wave.

Question 64

When light is traveling through a vacuum, what is the product of the light's wavelength and frequency equal to? A. Plank's constant B. wave number C. momentum D. speed of light

Answer 64

D. speed of light (P4Eng1 FIGURE)

Question 65

The inverse of wavelength is referred to as: A. wave number B. velocity C. frequency D. momentum

Answer 65

A. wave number Wave Number (k) is a property of a wave proportional to the reciprocal of the wavelength. (P4Eng1 FIGURE)

Question 66

What is the unit of power? A. J/ms B. J/s C. decibels/s D. W/s

Answer 66

B. J/s Units of Power 1W=1J/s 1 hp=746 W=550 ft-lb/s 1 Btu/h =0.239 W

Question 67

One curie is equal to. A. 3.7 x 10 disintegrations per second B. the energy of an alpha-particle C. mc^2 D. the square root of the binding energy

Answer 67

A. 3.7 x 10 disintegrations per second 1 Curie = 3.7 x 10 decays/sec = 3.7 x 10 Bq

Question 68

Who first explained the billiard-ball-like collisions photons make with the free electrons in a scattering material? He received the Nobel Prize in Physics in 1927 for this work. A. Walther Bothe B. Alfred Simon C. Arthur Compton D. Hans Geiger

Answer 68

C. Arthur Compton The American physicist Arthur Holly Compton explained (1922; published 1923) the wavelength increase by considering X-rays as composed of discrete pulses, or quanta, of electromagnetic energy. Compton was awarded the Nobel Prize in Physics for 1927 (sharing this with C. T. R. Wilson who received the Prize for his discovery of the cloud chamber method).

Question 69

At a point halfway between two identical point charges, the electric field is equal to: A. its maximum value B. half its maximum value C. zero D. pointing away from the two charges

Answer 69

C. zero At the midpoint between two identical charges, the resultant electric field is zero.

Question 70

Which one of the following laws best describes the operation of an electric generator? A. Ampere's Law B. Ohm's Law for Conductors C. Gauss' Law D. Faraday's Law of Induction

Answer 70

D. Faraday's Law of Induction Faraday's Law of Induction best describes the operation of an electric generator. Faraday's law of induction is a basic law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an electromotive force -a phenomenon known as electromagnetic induction.

Question 71

What is the phenomenon by which wavefronts of propagating waves bend in the neighborhood of obstacles? A. Rarefaction B. Refraction C. Diffraction D. Reflection

Answer 71

C. Diffraction Diffraction is the scattering or spreading of light waves as they pass around the edge or a small opening. Reflection is the bouncing of a wave. It occurs when light hitting the boundary returns into the materials. Refraction is the bending of a wave. It is the change in direction that occurs when a wave of energy such as light passes from one medium to another medium of different density.

Question 72

The Weber and the Maxwell are units of measure of: A. magnetic flux B. conductance C. relative speed D. electrical current

Answer 72

A. magnetic flux Weber - Sl unit of magnetic flux equal to 10 lines or maxwells. Named after the German physicist Wilhelm Weber(1804-1891) Maxwell - cgs unit of magnetic flux equal to one line of force. Named after the Scottish physicist, James Clerk Maxwell(1831-1879)

Question 73

The total energy of a vertically vibrating block attached to a spring is the same: A. at all points in its motion B. only at the equilibrium position C. only at those points above the equilibrium position D. only at those points below the equilibrium position

Answer 73

A. at all points in its motion The total energy of the system of a block and a spring is equal to the sum of the potential energy stored in the spring plus the kinetic energy of the block and is proportional to the square of the amplitude. The total energy of the system is constant.

Question 74

What law gives the relationship between angles of incidence and refraction for a wave impinging on an interface between two media with different index ofrefraction? A. Bragg's Law B. Snell's Law C. Hooke's Law D. Malus' Law

Answer 74

B. Snell's Law Snell's law states that a ray of light bends in such a way that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant. nisinθ1= nsinθ2 Malus' Law states that the intensity of light that passed through the polarizer is equal to the product of the maximum intensity and the square of the cosine of the polarizing angle. I = locosθ Hooke's Law states that the external force needed to stretch a spring to a distance x is given by: F = kx Bragg's Law states that when the x-ray is incident onto a crystal surface, its angle of incidence, θ, will reflect back with a same angle of scattering, θ. nA = 2d sin θ

Question 75

The rate at which electrical energy is used is measured in A. joules B. watts C. volts D. amperes

Answer 75

B. watts The rate at which electrical energy is used is called power and is expressed in Watts.

Question 76

Which one of the following is the advantage of connecting two dry cells in parallel instead of in series? Is it because the parallel arrangement: A. has no internal resistance B. gives twice the EMF of one dry cell C. generates heat in an external circuit half as fast as would a single cell D. has half the internal resistance of a single cell

Answer 76

D. has half the internal resistance of a single cell Connection two dry cells in parallel instead of in series has half the internal resistance of a single cell.

Question 77

Magnetic lines of force have all but which one of the following characteristics? A. they go from the South-pole to the North-pole of a magnet outside of the magnet B. they pass through copper C. they pass through copper D. they are most concentrated at the poles of a magnet

Answer 77

A. they go from the South-pole to the North-pole of a magnet outside of the magnet Magnetic lines of force go from North Pole to South Pole of a magnet outside the magnet. (P4Eng1 FIGURE)

Question 78

Quarks come in how many flavors? A. 3 B. 7 C. 6 D. 1

Answer 78

C. 6 There are six types, known as flavors, of quarks: up, down, charm, strange, top, and bottom.