General Physics II Exam Answer Key - 1470 Verified Questions by Quizplus

General Physics II

Exam Answer Key

Course Introduction

General Physics II is a continuation of introductory physics, focusing on electricity, magnetism, optics, and modern physics. The course explores fundamental principles such as electric fields, electric potential, capacitance, current, resistance, magnetic fields, induction, and electromagnetic waves. Topics also include the nature and behavior of light, lenses, mirrors, and an introduction to quantum physics and atomic models. Emphasis is placed on developing problem-solving skills, understanding laboratory techniques, and applying theoretical knowledge to real-world situations in science and engineering.

Recommended Textbook

College Physics Strategic Approach with Mastering Physics 2nd Edition by Randall D. Knight

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30 Chapters

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Page 2

Chapter 1: Representing Motion

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Q1) The following conversion equivalents are given:

1 mile = 5280 ft 1 ft = 12 in 1 m = 39.37 in 1 hour = 60 min 1 min = 60 s

A particle has a velocity of 4.7 miles per hour.The velocity,in m/s,is closest to:

A)2.1

B)1.7

C)1.9

D)2.3

E)2.5

Answer: A

Q2) If you needed to estimate the number of gallons of gasoline burned in the United States each year by automobiles,what quantities would you need to assume? What formula would you need to use?

Answer: If you assumed N = total number of cars

M = average number of miles driven each year per car

R = average number of miles per gallon

Then

Total number of gallons = 11ea9375_ac90_5c24_b28d_b5bdac389478_TB2706_11

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Chapter 2: Motion in One Dimension

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Sample Questions

Q1) A car accelerates from 5.0 m/s to 21 m/s at a rate of 3.0 m/s2.How far does it travel while accelerating?

A)69 m

B)207 m

C)41 m

D)117 m

Answer: A

Q2) The equation vfs2 = vis2+ 2as x applies to motion for which the "velocity versus time" graph is a straight line.

A)True

B)False

Answer: True

Q3) A person in a car is driving down a straight road.The instantaneous acceleration is decreasing with time,but is directed in the direction of the car's motion.The speed of the car is

A)increasing with time.

B)decreasing with time.

C)constant.

Answer: A

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Chapter 3: Vectors and Motion in Two Dimensions

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Q1) The magnitude of the resultant of two vectors must be greater than or equal to the magnitude of each of these vectors.

A)True

B)False

Answer: False

Q2) The components of a vector will be the same no matter what coordinate system is used to express that vector.

A)True

B)False

Answer: False

Q3) A hobby rocket reaches a height of 72.3 m and lands 111 m from the launch point.What was the angle of launch?

A)69.0°

B)67.4°

C)22.6°

D)-44.8°

Answer: A

Q4) Are projectiles subject to constant acceleration in two dimensions?

Answer: Yes,they are subject to the constant acceleration (g)along the vertical.

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Chapter 4: Forces and Newtons Laws of Motion

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Sample Questions

Q1) If you pound a feather with a hammer,the feather always pushes on the hammer just as hard as the hammer pushes on the feather.

A)True

B)False

Q2) Suppose the force of wind resistance is proportional to the speed of the object and in the direction opposite the object's velocity.If you throw an object upward,when is the magnitude of the acceleration the highest?

A)It is highest right after the object is released.

B)It is highest at the top of its trajectory.

C)The acceleration of the object is the same throughout the entire trajectory.

Q3) A stalled car is being pushed up a hill by three people,and it is moving at a constant speed.The net force on the car is A)zero.

B)in the same direction of the car's motion.

C)in the opposite direction of the car's motion.

D)None of the above

Q4) Three children pull on a toy in three different directions,yet the toy does not move.Explain how this could be possible.

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Page 6

Chapter 5: Applying Newtons Laws

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Sample Questions

Q1) A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle.The coefficients of static and kinetic friction between the hockey puck and the metal ramp are µs = 0.40 and µk = 0.30,respectively.The puck's initial speed is 63 m/s.What vertical height does the puck reach above its starting point?

A)130 cm

B)270 cm

C)200 cm

D)66 cm

Q2) If we step on the gas pedal of a car we will accelerate.Why don't we differentiate this action from braking? After all,when the brakes are applied the car decelerates,and that is different from accelerating.

Q3) Joe and Bill are playing tug-of-war.Joe is pulling with a force of 200 N.Bill is simply hanging on,but skidding toward Joe at a constant velocity.What is the force of friction between Bill's feet and the ground?

A)200 N

B)400 N

C)less than 200 N

D)greater than 200 N,but less than 400 N

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Chapter 6: Circular Motion,orbits,and Gravity

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Sample Questions

Q1) Through what angle in degrees does a 33 rpm record turn in 0.25 s?

A)50°

B)28°

C)36°

D)58°

Q2) If the Moon were twice the distance from Earth than it currently is,the amount of time it would take to go around Earth would be roughly (the current orbital period of the Moon is four weeks)

A)11 weeks.

B)eight weeks.

C)six weeks.

D)88 weeks.

Q3) Can a satellite be in an elliptical orbit under uniform circular motion?

Q4) What is the magnitude of the force exerted by Earth on the Moon?

A)2.01 × 1020 N

B)7.67 × 1028 N

C)2.01 × 1026 N

D)7.67 × 1031 N

Q5) Astronauts in orbit are weightless,but they are not beyond the pull of Earth's gravity.How can this be?

Page 8

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Chapter 7: Rotational Motion

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Q1) At time t = 0 s,a wheel has an angular displacement of zero radians and an angular velocity of +14 rad/s.The wheel has a constant acceleration of -0.41 rad/s2.In this situation,the time at which the angular displacement is + 88 rad and decreasing is closest to:

A)61 s

B)34 s

C)7 s

D)6 s

E)74 s

Q2) A torque of 12 N m is applied to a solid,uniform disk of radius 0.50 m.If the disk accelerates at 5.7 rad/s2,what is the mass of the disk?

A)17 kg

B)13 kg

C)8.5 kg

D)4.3 kg

Q3) If you deform an object,you do not change its mass but you may change its moment of inertia and the location of its center of mass.

A)True

B)False

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Page 9

Chapter 8: Equilibrium and Elasticity

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Q1) A 100 kg nonuniform boom,6.0 m long,is loosely pinned at the pivot at P.A 600 kg block is suspended from the end of the boom at A.The boom forms a 30° angle with the horizontal,and is supported by a cable,4.0 m long,between points D and B.Point B is 4.0 m from P,and point D is 4.0 m above P.The center of mass of the boom is at point C,which is 2.0 m from P.In the figure,the tension in the cable is closest to:

A)9300 N

B)8400 N

C)8100 N

D)7500 N

E)6900 N

Q2) An object attached to a spring is pulled across a frictionless surface.If the spring constant is 45 N/m and the spring is stretched by 0.88 m when the object is accelerating at 1.4 m/s2,what is the mass of the object?

A)28 kg

B)24 kg

C)31 kg

D)36 kg

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Page 10

Chapter 9: Momentum

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Q1) A 1120 kg car experiences an impulse of 30,000.0 N · s during a collision with a wall.If the collision takes 0.43 s,what was the velocity of the car just before the collision?

A)27 m/s

B)12 m/s

C)63 m/s

D)22 m/s

Q2) A fisherman throws the anchor off her boat at an angle of 3.0° above the horizontal.If the anchor weighs 2.0 times as much as she does and the boat moves with speed 2.7 m/s during the launch,how fast did she throw the anchor? (Solve for her frame of reference.Assume the mass of the boat is negligible. )

A)4.1 m/s

B)1.4 m/s

C)4.0 m/s

D)1.3 m/s

Q3) As a tile falls from the roof of a building to the ground its momentum is conserved.

A)True

B)False

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Chapter 10: Energy and Work

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Sample Questions

Q1) Describe the energy transfers that take place as you use a slingshot to shoot a rock into the air,it rises to a peak,then falls,and finally hits the ground and stops without bouncing.

Q2) A car drives 5.0 km north,then 7.3 km east,then 3.4 km northeast,all at a constant velocity.If the car had to perform 2.6 × 106 J of work during this trip,what was the magnitude of the average frictional force on the car?

A)1.7 × 102 N

B)2.4 × 102 N

C)3.2 × 102 N

D)3.6 × 102 N

Q3) A tennis ball bounces on the floor three times.If each time it loses 22.0% of its energy due to heating,how high does it bounce after the third time,provided we released it 2.3 m from the floor?

A)110 cm

B)11 cm

C)110 mm

D)140 cm

Q4) Is energy conserved during a two-car collision?

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Page 12

Chapter 11: Using Energy

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Sample Questions

Q1) A person reading a European newspaper finds that the low temperature the night before in Stockholm was -16°C.What is the equivalent temperature in degrees Fahrenheit?

A)3.20000076°F

B)-28.799999°F

C)23.1°F

D)8.9°F

Q2) A refrigerator increases the entropy of its hot reservoir at the same time as it decreases the entropy of its cold reservoir,but a heat engine does just the opposite.

A)True

B)False

Q3) Water turns to ice when it is placed in a freezer.During this process,the entropy of this water has decreased.

A)True

B)False

Q4) Is liberating heat through combustion a reversible or an irreversible process?

Q5) Does an increase in entropy increase or decrease the ability of a system to do work?

Q6) Is temperature a macroscopic or a microscopic concept?

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Chapter 12: Thermal Properties of Matter

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Sample Questions

Q1) At 0°C molecular motion ceases.

A)True

B)False

Q2) Two objects,A and B,are not in thermal equilibrium with each other.Object C is in thermal equilibrium with object A.What can you say about objects B and C with respect to thermal equilibrium?

Q3) You may have noticed that when you get out of a swimming pool and stand dripping wet in a light breeze,you feel much colder than you feel after you dry off.Why is this?

A)The moisture on your skin has good thermal conductivity.

B)Water has a relatively large heat capacity.

C)This is a purely psychological effect resulting from the way in which sensory nerves in the skin are stimulated.

D)The water on your skin is colder than the surrounding air.

E)540 calories of heat are required to evaporate each gram of water from your skin,and most of this heat flows out of your body.

Q4) A horizontal line on a PV diagram represents an isobaric process.

A)True

B)False

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Chapter 13: Fluids

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Sample Questions

Q1) The Bernoulli effect is responsible for the lift force on an airplane wing.Wings must therefore be designed so as to insure that

A)air molecules will be deflected downward when they hit the wing.

B)air molecules will be deflected upward when they hit the wing.

C)air molecules move more rapidly past the upper surface of the wing than past the lower surface.

D)air molecules move more rapidly past the lower surface of the wing than past the upper surface.

E)wings are thick enough to create a significant pressure difference between the top and bottom surfaces of the wings because of the different heights of these surfaces.

Q2) Calculate the pressure exerted on the ground by a 79 kgperson standing on one foot.Assume that the bottom of the person's foot is 13 cm wide and 28 cm long.

A)2.1 × 104 Pa

B)2.2 × 103 Pa

C)4.8 × 104 Pa

D)5.3 × 104 Pa

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Page 15

Chapter 14: Oscillations

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Sample Questions

Q1) A 0.25 kg harmonic oscillator has a total oscillation energy of 4.0 J.If the oscillation amplitude is 20.0 cm,what is the oscillation frequency?

A)4.5 Hz

B)1.4 Hz

C)2.3 Hz

D)3.1 Hz

Q2) If both the mass of a simple pendulum and its length are doubled,the period will A)be unchanged.

B)increase by a factor of 2.

C)increase by a factor of 4.

D)increase by a factor of 1.4

E)increase by a factor of 0.71.

Q3) A mass attached to a very light spring executes simple harmonic motion.If you want to double its total energy,you should

A)double the amplitude of vibration while changing nothing else.

B)double the force constant of the spring while changing nothing else.

C)double both the amplitude and force constant.

D)double the mass while changing nothing else.

E)double both the mass and amplitude of vibration.

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Page 16

Chapter 15: Traveling Waves and Sound

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Q1) In the figure,which of the curves best represents the variation of wave speed as a function of tension for transverse waves on a stretched string?

A)A

B)B

C)C

D)D

E)E

Q2) Which of the following forms is not a solution of the wave equation?

A)y = A sin(kx2 - t2)

B)y = A sin(kx)cos( t)

C)y = A log(1/[kx - t]2)

D)y = A sin-1([kx - t]3)

Q3) Light from a laser forms a 1.31 mm diameter spot on a wall.If the light intensity in the spot is 3.69 x 104 W/m2,what is the power output of the laser?

A)49.7 mW

B)30.8 mW

C)41.7 mW

D)57.7 mW

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Chapter 16: Superposition and Standing Waves

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Q1) Which of the following is an accurate statement?

A)A system like a vibrating string has only one possible frequency.

B)In order for a singer to break a wine glass by singing,she must adjust the amplitude of the sound she makes so that it is exactly equal to the amplitude of vibration of the wine glass.

C)The fundamental frequency of a system is the name given to the highest possible frequency at which the system will naturally vibrate.

D)The sound in an organ pipe can vibrate at an infinite number of frequencies.

Q2) Two harmonic waves of the same frequency and phase but of different amplitudes move in opposite directions on a string.A periodic series of maxima and minima on the string are observed.What is the ratio of the maximum displacement at a minimum position to that at a maximum position,if one amplitude is 52% of the other? (This is called the standing wave ratio. )

A)0.32%

B)48%

C)0.0%

D)52%

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Page 18

Chapter 17: Wave Optics

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Q1) A diffraction grating is described by its groove spacing d.But each groove consists of a clear aperture a and an opaque part b.For fixed d how does changing a and b (the ratio a/b)affect the diffracted light?

Q2) Light from sources A and B passes through the same diffraction grating and falls on a distant screen.If A produces a first-order bright spot at 30° and B produces one at 60°,then the wavelength of the light from B must be twice as great as the wavelength of the light from B.

A)True

B)False

Q3) Light passes through two small parallel slits and leaves an interference pattern on a distant screen.If the two slits are now moved closer to each other,the bright fringes on the screen will also move closer to each other.

A)True

B)False

Q4) Two identical gratings are put together to make one grating twice as wide.What condition must be fulfilled so that the resolution truly doubles?

Q5) Why are only about 6-10 minima seen when light illuminates a single slit?

Q6) How wide is a single slit that gives its first minimum at 90°?

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Chapter 18: Ray Optics

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Q1) Suppose you place your face in front of a concave mirror.

A)If you position yourself between the center of curvature and the focal point of the mirror,you will not be able to see your image.

B)No matter where you place yourself,a real image will be formed.

C)Your image will always be inverted.

D)Your image will be diminished in size.

E)None of these is true.

Q2) Light having a wavelength in vacuum of 600 nm enters a liquid of refractive index 2.0.In this liquid,its wavelength will be:

A)1200 nm

B)600 nm

C)300 nm

D)150 nm

E)None of the above choices are correct.

Q3) The critical angle for two materials is the angle of incidence for which the incident light is not deflected as it passes from one of these materials into the other one.

A)True

B)False

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Chapter 19: Optical Instruments

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Q1) In a compound microscope

A)both the objective and the eyepiece form real images.

B)magnification is provided by the objective lens and not by the eyepiece.The eyepiece merely increases the resolution of the image viewed.

C)magnification is provided by the objective and not by the eyepiece.The eyepiece merely increases the brightness of the image viewed.

D)the magnification is m1 + M1,where m1 is the lateral magnification of the objective and M2 is the angular magnification of the eyepiece.

E)the image of the objective serves as the object for the eyepiece.

Q2) A myopic girl wears eyeglasses that allow her to have clear distant vision.The power of the lenses of her eyeglasses is - 3.00 diopters.Without eyeglasses,the far point of the girl is closest to:

A)0.33 m

B)0.25 m

C)0.17 m

D)0.42 m

E)0.50 m

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Chapter 20: Electric Fields and Forces

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Q1) A 3.0 C positive charge is located at the origin and a 2.0 C positive charge is located at x = 0.0 m,y = 1.0 m.Find the point between them where the electric field strength is zero.

A)x = 0 m,y = 0.55 m

B)x = 0 m,y = 0.67 m

C)x = 0 m,y = 1.5 m

D)x = 0 m,y = 0.60 m

Q2) What is the magnitude of an electric field that balances the weight of a plastic sphere of mass 6.4 g that has been charged to -3.0 nC?

A)2.1 × 107 N/C

B)2.4 × 106 N/C

C)4.5 × 106 N/C

D)6.4 × 106 N/C

Q3) Two nuclei each contain two protons and exert a force 4 N on each other.If we transfer a proton from one of these nuclei to the other,the force on each nucleus is now reduced to 3 N.

A)True

B)False

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Chapter 21: Electric Potential

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Q1) Two conductors are joined by a long copper wire.Thus

A)each conductor carries the same free charge.

B)each conductor must be at the same potential.

C)the electric field at the surface of each conductor is the same.

D)no free charge can be present on either conductor.

E)the potential on the wire is the average of the potential of each conductor.

Q2) A 1.0 F capacitor has a potential difference of 6.0 V applied across its plates.If the potential difference across its plates is increased to 8.0 V,how much additional energy does the capacitor store?

A)14 J

B)28 J

C)2.0 J

D)4.0 J

Q3) A uniform electric field has the strength of 5.0 N/C.What is the electric energy density of the field? (The value of o is 8.85 \(\times\) 10S1U1P1-12

S1S1P0C2/N·m2. )

A)1.1 × 10-10 J/m3

B)2.2 × 10-11 J/m3

C)1.4 × 1012 J/m3

D)2.8 × 1012 J/m3

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Chapter 22: Current and Resistance

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Q1) A tube of mercury with resistivity 9.84 × 10-7 ·m has a 23.0 N/C electric field inside the column of mercury.How much current is flowing,if the diameter of the tube is ?

A)18 A

B)180 A

C)29 A

D)280 A

Q2) A device with a resistance of 200.0 k is connected to a 9.0 V battery.How much power does the device use?

A)0.41 mW

B)16,000 kW

C)0.045 mW

D)1800 kW

Q3) A current flowing through a copper wire (which is connected to a battery)is due to A)electrons being accelerated by an electric field.

B)positively charged particles being pushed off the battery terminal.

C)electrons being bumped by positively charged particles.

D)positively charged particles being attracted to the negative terminal of a battery.

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Chapter 23: Circuits

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Q1) If the graph of the current through a resistor as a function of the potential difference across it is a straight line with a positive slope passing through the origin,the resistor obeys Ohm's law and the slope of this graph is equal to the resistance of this resistor.

A)True

B)False

Q2) The potential across the terminals of a store-bought 1.5 V AAA battery always remains at 1.5 V unless the battery has gone dead.

A)True

B)False

Q3) In the figure shown,what is the power dissipated in the 2 ohm resistance in the circuit?

A)5.33 W

B)8.0 W

C)6.67 W

D)2.67 W

E)3.56 W

Q4) Why is it appropriate that electromotive force be measured in volts?

Q5) Of voltmeters and ammeters,which is/are connected in series?

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Chapter 24: Magnetic Fields and Forces

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Q1) Consider a solenoid of length L,N windings,and radius b (L is much longer than b).A current I is flowing through the wire.If the radius of the solenoid were doubled (becoming 2b),and all other quantities remained the same,the magnetic field A)would remain the same. B)would become twice as strong. C)would become one half as strong.

Q2) A charge moving in a straight line enters a uniform electric or magnetic field.If the motion of this charge is not affected,this field could only have been a magnetic field,not an electric field.

A)True B)False

Q3) A very short solenoid contains N = 20 circular loops of wire.The radius of the loop is R = 0.5 meters,and the length of the solenoid is d = 0.02 meters.Approximately what is the magnetic field in the center of the solenoid?

A)µoN I/d

B)µoN I/(2R)

C)µoN I/(2dR)

D)µoN I/(2pR)

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Chapter 25: Electromagnetic Induction and Electromagnetic Waves

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Q1) A conductor is formed into a loop that encloses an area of 1.0 m2.The loop is oriented at a 30.0º angle with the xy-plane.A varying magnetic field is oriented parallel to the z-axis.If the maximum emf induced in the loop is 25.0 V,what is the maximum rate at which the magnetic field strength is changing?

A)29 T/s

B)22 T/s

C)50 T/s

D)13 T/s

Q2) A circular coil of 20 turns and radius 5 cms is placed with its plane oriented at 90° to a magnetic field of 0.1 T.The field is now increased at a steady rate,reaching a value of 0.5 T after 4 seconds.What emf is induced in the coil?

A)0.016 V

B)0.021 V

C)0.026 V

D)0.031 V

E)0.036 V

Q3) By how much are the electric and magnetic fields out of phase in an electromagnetic wave?

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Chapter 26: Ac Electricity

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Q1) An alternating current is supplied to a lightbulb,which strobes.A motor rotates a white fan (with one blade painted red)at 504 Hz in the light from the strobing bulb,and the fan appears to stand still.At 252 Hz the red blade alternates between two positions that are 180° apart.What is the angular frequency of the current? (Be careful,the light will strobe regardless of the sign of the current. )

A)504 rad/s

B)252 rad/s

C)1008 rad/s

D)126 rad/s

Q2) In a purely resistive AC circuit,when the voltage is at its maximum,the current is at its maximum value as well.

A)True

B)False

Q3) In an AC circuit consisting of a resistor and capacitor in series with each other,the sum of the peak voltages across the resistor and across the capacitor must add up to the emf of the AC source.

A)True

B)False

Q4) If a circuit doubles its peak voltage,what happens to its rms voltage?

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Chapter 27: Relativity

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Q1) A hydrogen atom and a neutron fuse to form deuterium.If the energy released is 3.6 × 10-13 J,what is the mass of the deuterium? Take the H atom nucleus as a single proton.

A)3.3 × 10-27 kg

B)3.4 × 10-27 kg

C)2.0 × 10-30 kg

D)1.3 × 10-27 kg

Q2) In a spaceship that is approaching Earth at 80% the speed of light,the captain shines a laser beam directly toward Earth.The captain measures the laser light's speed to be 3.00 × 108 m/s and the receiving station on Earth will measure exactly the same speed for this light.

A)True

B)False

Q3) Consider two synchronized,extremely accurate clocks.One clock is on the ground,the other is placed in a jet and flown once around the world,then taken out of the plane and compared with the ground clock.Will the clock on the jet read a time earlier than,the same as,or later than the stationary clock? Support your answer?

Q4) Explain why it is impossible for an object to travel at the speed of light.

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Chapter 28: Quantum Physics

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Sample Questions

Q1) The maximum kinetic energy of photoelectrons from a metal is equal to the work function of that metal.

A)True

B)False

Q2) Photons all travel at the speed of light so they must all have the same energy.

A)True

B)False

Q3) For what wavelength does a 100 mW laser deliver 1.6 × 1017 photons in one second?

A)320 nm

B)330 nm

C)340 nm

D)350 nm

Q4) Increasing the brightness of a beam of light without changing its color will increase

A)the number of photons emitted by light every second.

B)the average energy of each photon.

C)the speed of the photons.

D)Two of the above statements are true.

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Chapter 29: Atoms and Molecules

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Q1) The Bohr model of the hydrogen atom was not able to explain

A)the cause of why some emission lines were brighter than other emission lines.

B)the wavelengths of the emission lines in the ultraviolet range.

C)the wavelengths of the emission lines in the infrared range.

D)None of the above;the Bohr model explained all of these features.

Q2) The longest wavelength of a photon that can be emitted by a hydrogen atom,for which the initial state is n = 3,is closest to:

A)550 nm

B)575 nm

C)600 nm

D)625 nm

E)650 nm

Q3) The shortest wavelength of a photon that can be emitted by a hydrogen atom,for which the initial state is n = 12,is closest to:

A)92 nm

B)82 nm

C)72 nm

D)62 nm

E)52 nm

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Chapter 30: Nuclear Physics

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Q1) A radioactive nuclide of atomic number Z emits an electron,then the daughter nuclide emits a gamma ray.What is the atomic number of the resulting nuclide after both processes?

A)Z+1

B)Z-1

C)Z-2

D)Z-3

Q2) A stable nucleus contains many protons very close to each other,all positively charged.Why do the protons not fly apart due to mutual Coulomb repulsion?

A)Attractive nuclear forces in the nucleus counteract the effect of the Coulomb forces.

B)There are an equal number of electrons in the nucleus that neutralize the protons.

C)The neutrons in the nucleus shield the protons from each other.

D)The Coulomb force does not operate within nuclei.

Q3) If a 20 kg brick is made entirely of radioactive atoms of half-life 5 days,at the end of 5 days this brick will have a mass of 10 kg.

A)True

B)False

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