Physics MCQ series - 13

121:  A machine having an efficiency of 50% does 500 joules of work. Which of the following is the work input?  Is it: 

w) 500 joules

x) 250 joules

y) 1000 joules

z) 2500 joules

ANSWER:  Y -- 1000 JOULES

122:  The relationship between kinetic energy and the potential energy of a swinging pendulum bob is one of the following.  Is it:

w) kinetic energy is greater than potential energy

x) kinetic energy is less than potential energy

y) kinetic energy is equal to potential energy

z) kinetic energy plus potential energy equals a constant 

ANSWER:  Z -- KINETIC ENERGY PLUS POTENTIAL ENERGY EQUALS A CONSTANT 

123:  A 10 kilogram ball falls from a height of 5 meters and rebounds from the floor to a height of 3 meters.  The energy lost by the ball is:

w) 20 joules

x) 98 joules

y) 196 joules

z) 294 joules

ANSWER:   Y -- 196 JOULES

124:  What is the Celsius temperature corresponding to 100 degrees Kelvin?

ANSWER:  -173 DEGREES CELSIUS

125:  A kilocalorie is equal to one of the following.  Is it equal to:

w) 4.2 Joules

x) 1000 Joules

y) 4200 Joules

z) 10,000 Joules

ANSWER:  Y -- 4200 JOULES

126:  An increase in the motion of the molecules of a gas confined in a steel tank will be observed in one of the following ways. Will it be observed as an increase in:

w) the temperature of the gas only

x) the pressure of the gas only

y) both the temperature and pressure of the gas

z) the temperature of the gas and a decrease in its pressure 

ANSWER:  Y -- BOTH THE TEMPERATURE AND PRESSURE OF THE GAS

127:  According to the kinetic theory, the Kelvin temperature of an ideal gas is proportional to which one of the following. Is the temperature proportional to the gas's average molecular: 

w) velocity

x) momentum

y) kinetic energy

z) potential energy

ANSWER:  Y -- KINETIC ENERGY

128:  Under which of the following conditions does the behavior of a realgas resemble that of an ideal gas?  Is it: 

w) under all conditions of temperature and pressure

x) only at very high pressure

y) only when the gas is near condensation

z) only at low densities when the molecules are relatively far apart 

ANSWER:  Z -- ONLY AT LOW DENSITIES WHEN THE MOLECULES ARE

RELATIVELY FAR APART

129:  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:

w)  in phase and have equal amplitudes

x)  in phase and have unequal amplitudes

y)  180 degrees out of phase and have equal amplitudes

z)  180 degress out of phase and have unequal amplitudes

ANSWER:  Y --  180 DEGREES OUT OF PHASE AND HAVE EQUAL AMPLITUDES 

130:  As the temperature of the air increases from 0 degrees C to 20 degrees C, the wavelength of a sound made by a tuning fork of fixed frequency does which of the following?  Does the wavelength 

w) increase

x) decrease

y) remain the same

z) increase up to a maximum, then remain constant

ANSWER:  W -- INCREASE Science Bowl PHYSICS

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Physics MCQ series - 12

111:  Which one of the following is the name of a device used to measure voltage without drawing ANY current from the circuit being measured?  Is it:

w) a watt-meter

x) a galvanometer

y) an ammeter

z) a potentiometer

ANSWER:  Z -- A POTENTIOMETER

112:  Lenz's law is an example of the law of conservation of one of the following.  Is it conservation of?

w) mass

x) charge

y) momentum

z) energy

ANSWER:  Z -- ENERGY

113:  After a projectile is fired horizontally near the earth's surface, the horizontal component of its velocity, neglecting any air resistance:

 

w) Increases steadily

x) Decreases steadily

y) First decreases, then increases

z) remains constant

ANSWER:  Z -- REMAINS CONSTANT

114:  Two bodies are moving in circular paths of equal radii.  If the speed of the first body is twice that of the second, the centripetal acceleration of the first body is how many times greater than that of the second body?

ANSWER:  4Science Bowl PHYSICS

115:  Two bodies of equal mass are moving in circular paths at equal speed.The first body moves in a circle whose radius is twice as great as that of the second.  The ratio of the centripetal or radial acceleration of the first body to that of the second is: 

w) 1 to 4

x) 1 to 3

y) 1 to 2

z) 1 to 1

ANSWER:  Y -- 1 TO 2

116:  A force applied to a rocket gives it an upward acceleration equal to 2 times the acceleration of gravity.  The magnitude of the force is equal to:

w) the weight of the rocket

x) twice the weight of the rocket

y) three times the weight of the rocket

z) four times the weight of the rocket

ANSWER:  Y -- THREE TIMES THE WEIGHT OF THE ROCKET

117:  A satellite is observed to move in a circle about the earth at a constant speed.  This means that the force acting upon it is:

w) zero

x) parallel to the direction of the satellite's instantaneous velocity

y) perpendicular to the direction of the satellite's instantaneous velocity

z) none of the above

ANSWER:  Y -- PERPENDICULAR TO THE INSTANTANEOUS DIRECTION OF THE SATELLITE VELOCITY

118:  When a person stands on a scale in an elevator at rest, the scale reads 800 newtons.  When the elevator is allowed to fall freely with acceleration of gravity, the scale reads one of the following. Does the scale read?

w) 1600 Newton’s

x) 800 Newton’s

y) 400 Newton's

z) 0 Newton's

ANSWER:  Z -- 0 NEWTONS

119:  A 10,000-watt motor operates an elevator weighing 5000 Newton’s. Assuming no frictional losses, how high is the elevator raised in 10 seconds.  Is it raised?

w) 2 meters

x) 20 meters

y) 50 meters

z) 100 meters

ANSWER:  X -- 20 METERS

120:  A machine's output is 4000 joules and its frictional losses are 1000 joules.  Which of the following is its efficiency?  Is it:

w) 25%

x) 30%

y) 75%

z) 80%

ANSWER:  Z -- 80%

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Physics MCQ series - 11

101: A satellite of mass "M" is in orbit around the earth. If a second Satellite of mass "2M" is to be placed in the same orbit; the second satellite must have a velocity Which is?

w) Half the velocity of the first satellite

x) The same as the velocity of the first satellite

y) Twice the velocity of the first satellite

z) Four times the velocity of the first satellite

ANSWER:  X -- THE SAME AS THE VELOCITY OF THE FIRST SATELLITE

102:  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 waves:

w) Propagation velocity

x) Period

y) Amplitude

z) Frequency

ANSWER:  W -- PROPAGATION VELOCITYScience Bowl PHYSICS

103:  A spring with a force constant of 100 Newtons per meter is loaded With a mass of 1.0 kilogram.  The period of vibration of this system is:

w) .03 seconds

x) .06 seconds

y) .31 seconds

z) .63 seconds

ANSWER:  Z -- .63 SECONDS

104:  The first instrument used for measuring temperature was the gas Thermos cope invented by:

w) Celsius

x) Galileo

y) Centigrade

z) Fahrenheit

ANSWER:  X -- GALILEO

105:  The first law of thermodynamics is concerned with the conservation of

w) Energy

x) Momentum

y) Charge

z) Matter

ANSWER:  W -- ENERGY

106:  Which of the following best completes the statement:  The calorie is the amount of heat needed to raise:

w) 1 gram of water 1 degree Celsius

x) 1 gram of water 1 degree Rankin

y) 1 kilogram of water 1 degree Celsius

z) 1 kilogram of water 1 degree Kelvin

ANSWER:  W -- 1 GRAM OF WATER 1 DEGREE CELSIUS Science Bowl PHYSICS

107: Units commonly used for entropy are:

w) Kilograms per degree Kelvin

x) Joules per degree Kelvin

y) Newtons per Coulomb

z) Ergs

ANSWER:  X -- JOULES PER DEGREE KELVIN

108:  The amount of heat required to change a boiling liquid to a gas at the same temperature depends on one of the following properties of the liquid.  Does it depend on the liquid's:

w) Heat of fusion

x) Heat of vaporization

y) Temperature

z) Density

ANSWER:  X  -- HEAT OF VAPORIZATION

109:  According to the second law of thermodynamics, energy tends to become more and more unavailable for conversion from:

w) Thermal to kinetic energy

x) Kinetic to thermal energy

y) Thermal to mechanical energy

z) Mechanical to thermal energy

ANSWER:  Y -- THERMAL TO MECHANICAL ENERGY

110:  When a charge moves through an electric circuit in the direction of an electric force it does one of the following four things.  Does it:

w) Lose potential energy and gain kinetic energy

x) Gain potential energy and lose kinetic energy

y) Lose both potential and kinetic energy

z) Gain both potential and kinetic energy

ANSWER:  W -- LOSE POTENTIAL ENERGY AND GAIN KINETIC ENERGY Science Bowl PHYSICS

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Physics MCQ series - 10

91:  The Millikan experiment showed that electric charge was:

w) Negative

x) Quantized

y) Positive

z) unmeasurable

ANSWER:    X – QUANTIZED

92:  When a metal becomes a superconductor, there is a tremendous decrease in it’s:

w) Total volume

x) Electrical resistance

y) Length

z) Density

ANSWER:    X -- ELECTRICAL RESISTANCE

93:  An x-ray photon collides with a free electron, and the photon is scattered.  During this collision there is conservation of:

w) Momentum but not energy

x) Neither momentum nor energy

y) Energy but not momentum

z) Both momentum and energy

ANSWER:    Z -- BOTH MOMENTUM AND ENERGY

94:  In the sun, helium is produced from hydrogen by:

w) Radioactive decay

x) Disintegration

y) Fission

z) Fusion

ANSWER:    Z – FUSION Science Bowl PHYSICS

95:  The half-life of an isotope of an element is 5 days.  The mass of a 10 gram sample of this isotope remaining after 20 days is:

w) 0.312 grams

x) 0.625 grams

y) 1.25 grams

z) 2.50 grams

ANSWER:    X -- 0.625 GRAMS

96:  The idea that electrons revolved in orbits around the nucleus of an atom without radiating energy away from the atom was postulated by:

w) Thompson

x) Bohr

y) Rutherford

z) Einstein

ANSWER:    X – BOHR

97:  Alpha particles are nuclei of:

w) Hydrogen

x) Helium

y) Oxygen

z) Nitrogen

ANSWER:    X – HELIUM

98:  A ball falling vertically from rest for 3 seconds travels very nearly:

w) 14.7 meters

x) 29.4 meters

y) 44.1 meters

z) 88.2 meters

ANSWER: Y -- 44.1 METERS Science Bowl PHYSICS

99:  A car is moving along a straight horizontal road at a speed of 20 meters per second.  The brakes are applied and a constant force of 5000 Newtons decelerates the car to a stop in 10 seconds.  The mass of the car is:

w) 1250 kilograms

x) 2500 kilograms

y) 5000 kilograms

z) 10,000 kilograms

ANSWER:  X -- 2500 KILOGRAMS

100:  A girl throws a 0.1 kilogram ball at a wall.  The ball hits the wall perpendicularly with a velocity of 5 meters per second and then bounces straight back with a velocity of 4 meters per second.  The change in the momentum of the ball is:

w) 0.1 kilogram-meters per second

x) 0.4 kilogram-meters per second

y) 0.5 kilogram-meters per second

z) 0.9 kilogram-meters per second

ANSWER:  Z -- 0.9 KILOGRAM-METERS PER SECOND

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Physics MCQ series - 09

81:  As a pendulum is raised to higher altitudes, its period:

w) increases

x) decreases

y) remains the same

z) decreases, then remains the same

ANSWER :    W – INCREASES

82:  Two vibrating particles that are "out of phase" differ in the phase of their vibration by:

w) 1/4 cycle

x) 1/2 cycle

y) 3/4 cycle

z) 1 cycle

ANSWER :    X -- 1/2 CYCLE

83:  The SI unit of pressure is the:

w) Torr

x) Dyne per centimeter squared

y) Atmosphere

z) Pascal

ANSWER :    Z -- PASCAL Science Bowl PHYSICS

84:  An electroscope charged WITHOUT contacting a charged body is charged by:

w) Induction

x) Conduction

y) Convection

z) Insulation

ANSWER:    W – INDUCTION

85:  The potential drop between the terminals of a battery is equal to the battery's EMF when:

w) No current is drawn from the battery

x) A very large current is drawn from the battery

y) The internal resistance of the battery is very large

z) The resistance in the external circuit is small

ANSWER :    W -- NO CURRENT IS DRAWN FROM THE BATTERY

86:  To convert a galvanometer to a voltmeter, you should add a:

w) High resistance in series

x) High resistance in parallel

y) Low resistance in series

z) Low resistance in parallel

ANSWER:    W -- HIGH RESISTANCE IN SERIES

87:  The greatest induced EMF will occur in a straight wire moving at constant speed through a uniform magnetic field when the angle between the direction of the wire's motion and the direction of the magnetic field is

w) 0 degrees

x) 30 degrees

y) 60 degrees

z) 90 degrees

ANSWER:    Z -- 90 DEGREES Science Bowl PHYSICS

87:  A 10 volt battery connected to a capacitor delivers a charge of 0.5 coulombs.  The capacitance of the capacitor is:

w) 2 x 10-2 farads

x) 5 x 10-2 farads

y) 2 farads

z) 5 farads

ANSWER:    X -- 5 x 10-2 FARADS

88:  Two light rays will interfere constructively with maximum amplitude if the path difference between them is:

w) One wavelength

x) One-half wavelength

y) one-quarter wavelength

z) one-eighth wavelength

ANSWER:    W -- ONE WAVELENGTH

89:  Light is normally incident on a thin soap film and is reflected.  If the wavelength of this light is "L" and the index of refraction of the soap film is "N", complete destructive interference will occur for a film hickness of:

w) L / 8N

x) L / 4N

y) L / 2N

z) 3L / 4N

ANSWER:    Y -- L / 2N

90:  The Michelson interfero meter was designed to study the nature of:

w) Water waves

x) Sound waves

y) An "ether"

z) Sunlight

ANSWER:    Y -- AN "ETHER" Science Bowl PHYSICS

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Physics MCQ series - 08

71:  Which of the following colors of visible light has the longest wavelength?  Is it:

w) violet

x) green

y) yellow

z) red

ANSWER :    Z -- REDScience Bowl PHYSICS

72:   A 10 kilogram mass rests on a horizontal frictionless surface.  A horizontal force of 5 Newtons is applied to the mass.  After the force has been applied for 1 second, the velocity of the mass is:

w) 0 meters per second

x) 0.5 meters per second

y) 5 meters per second

z) 50 meters per second

ANSWER :    X -- 0.5 METERS PER SECOND

73:  A worker lifts a 10 kilogram block a vertical height of 2 meters.  The work he does on the block is:

w) 5 Joules

x) 20 Joules

y) 49 Joules

z) 200 Joules

ANSWER :    Z -- 200 JOULES

74:  An impulse of 10 kilogram-meter per second acting on an object whose mass is 5 kilogram will cause a change in the objects velocity of:

w) 0.5 meters per second

x) 2 meters per second

y) 10 meters per second

z) 50 meters per second

ANSWER :    X -- 2 METERS PER SECOND

75:  The time needed for a net force of 10 newtons to change the velocity of a 5 kilograms mass by 3 meters/second is:

w) 1.5 seconds

x) 6 seconds

y) 16.7 seconds

z) 150 seconds

ANSWER :    W -- 1.5 SECONDS Science Bowl PHYSICS

76:  The value of G, the universal gravitational constant, was measured experimentally by:

w) Newton

x) Cavendish

y) Copernicus

z) Kepler

ANSWER :    X – CAVENDISH

77:  Two steel balls are at a distance S from one another.  As the mass of ONE of the balls is doubled, the gravitational force of attraction between them is:

w) quartered

x) halved

y) doubled

z) quadrupled

ANSWER :    Y – DOUBLED

78:  If the distance between the earth and moon were halved, the force of the attraction between them would be:

w) one fourth as great

x) one half as great

y) twice as great

z) four times as great

ANSWER :    Z -- FOUR TIMES AS GREAT

79:  As a 10 kilogram mass on the end of a spring passes through its equilibrium position, the kinetic energy of the mass is 20 joules.  The speed of the mass is:

w) 2.0 meters per second

x) 4.0 meters per second

y) 5.0 meters per second

z) 6.3 meters per second

ANSWER :    W -- 2.0 METERS PER SECOND Science Bowl PHYSICS

80:  As a longitudinal wave moves through a medium, the particles of the medium:

w) vibrate in a path parallel to the path of the wave

x) vibrate in a path perpendicular to the path of the wave

y) follow the wave along its entire path

z) do not move

ANSWER :    W -- VIBRATE IN A PATH PARALLEL TO THE PATH OF THE WAVE

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