Quiz
Physical Science Final Exam
Perguntas do quiz (128)
1The International System of Units, SI Units, or metrics units of: length, mass, and time are:
- Am, kg, min
- Bm, kg, h
- Cft, slug, s
- Dm, kg, s
- Ecm, g, s
2The power in SI-Unit is measured in Watt, that is related to energy by being equal to
- Aenergy times time
- Benergy consumed
- Cenergy wasted
- Denergy times distance
- Eenergy per unit time
3The energy source most used in the United States is
- Acoal
- Bwater
- Cnatural gas
- Doil
- Ebiomass (wood)
4The two factors that influence energy consumption are:
- Asupply and demand
- Bresource and price
- Ccost and production
- Dlifestyle and efficiency
5If you started with a $1,600 investment and you had $12,800 after 6 years, what would be the annual interest rate you received?
- A14%
- B15%
- C35%
- D19%
6What is the amount of power in kilowatts consumed per capita in the United States?
- A2 kW
- B3 kW
- C12 kW
- D5 kW
7Running a clothes dryer for 90 minutes (1.5 hours) at 1600 Watts will cost about ____ cents if the cost of electricity is 10 cents per kWh:
- A4 cents
- B10 cents
- C50 cents
- D24 cents
8The growth rate of GDP of a certain country is 3.5% per year. This means that the GDP is doubling every ____
- A2 years
- B10 years
- C5 years
- D20 years
9A simple machine, such as a set of pulleys and ropes, known as block and tackle, are devices or tools that multiply applied-force, and changes its direction, at the expense of:
- Aspeed
- Bvelocity
- Cdistance
- Dacceleration
10The following statement is describing which of the three Newton's Laws of Motion? When no-net force is acting is acting on an object, if it is at rest it remains at rest, or if it is in motion, it can only move at a constant velocity.
- AFirst law
- BSecond law
- CThird law
- DLaw of gravity
11According to Newton's second law of motion, when a net-force acts on an object, the object must be ____
- Aaccelerating
- Bgoing at a constant speed
- Cmoving at constant velocity
- Dat rest
12According to Newtons third law, if the push that the car tires give to the road-surface is the action force, the the reaction force is
- Athe weight of the car
- Bthe force of the car upon the tires
- Cthe friction force of the road-surface on the tires
- Dthe acceleration of the car
13If a 60 kg person is observed to accelerate at the rate of 4 m/s(^2), the net force responsible for this is
- A240 N
- B100 N
- C120 N
- D140 N
14A car having an initial speed of 9 m/s starts to accelerate at the rate of 4 m/s(^2), the final speed after 5.5 seconds is
- A25 m/s
- B15 m/s
- C19 m/s
- D31 m/s
15A car is moving at 22 m/s (50 mph), when driver sees the traffic light turning red and immediately applies the brakes, decelerating at 6 m/s(^2). What is the car's stopping distance, neglecting the driver's reaction times?
- A30.4 m
- B10.2 m
- C20.3 m
- D40.3 m
16If a stone is dropped from a bridge that is 133 m above the water, how long will it take until the stone hits the water?
- A1.7 s
- B5.2 s
- C3.1 s
- D6.2 s
17A ball is projected straight downward with an initial speed of 20 m/s. After 3 seconds, about how fast is it going?
- A30 m/s
- B45.4 m/s
- C49.4 m/s
- D60.5 m/s
18A ball is projected straight up at an initial speed of 24.5 m/s. After 2.5 seconds, what is it's speed?
- A9.8 m/s
- B14.7 m/s
- C4.9 m/s
- D0 m/s
19How much work is required to increase the velocity of a 4 kg car from rest to 5 m/s?
- A100 J
- B200 J
- C20 J
- D50 J
20The gravitational potential energy of an object, near the Earth's surface, and the work done to lift the object to the height "h" is given by
- Aweight times height
- Bmass times height
- Cmass times speed
- Dmass times acceleration
21From work-KE theorem, what is the speed of a car of mass 2500 kg, after it is pushed by a force of 500 N over a horizontal distance of 10 m?
- A1 m/s
- B4 m/s
- C2 m/s
- D3 m/s
22When a car is braked to a stop, it's kinetic energy is transformed into
- Astopping energy
- Benergy of motion
- Cpotential energy
- Dheat energy
23Our nose cracker moved back and forth as shown. The kinetic energy will be greatest at what point?
(A -> B -> C)- AA
- BB
- CA and C
- Dhalfway between A and B
24The efficiency of a lightbulb is the ratio of the
- Aenergy input to the energy out of the bulb
- Blight output of the bulb to the electrical energy input
- Cheat energy out to the electrical energy in
- Dvoltage output of the bulb to the power input
25If the energy conversion efficiencies in a 3 step process are 36% for the first step, 44% for the second, and 26% for the third, the overall efficiency is about:
- A4%
- B9%
- C0.4%
- D2%
26For a fossil fueled electrical generating plant, 10,000 Btus of chemical energy input into the plant will result in about how many Btus of waste heat dumped into the environment if the efficiency of power plant is 35%?
- A8,800 Btus
- B10,000 Btus
- C4,080 Btus
- D6,500 Btus
27The first law of thermodynamics states that: heat added to the system, plus work done on the system, equals change in the total energy of the system. This statement is based on-
- Ahow heat can be conducted
- Bhow temperature is increased
- Cthe principle of conservation of energy
- Dthe state of the system
28The second law of thermodynamics states that heat energy flows in the direction of
- Aup, since heat rises
- Bhigher temperature
- Clower temperature
- Dlower entropy
29The total R-value of a wall made of different layers of materials is obtained by
- Amultiplying the R values of each layer
- Bthe sum of R values for each layer
- Csum of areas of each layer
- Dsum of thicknesses of each layer
30When ice crystals form in the clouds,
- Aphase change from solid to liquid occurs
- Bthe thermal mass of the atmosphere increases
- Cheat energy is released
- Dthe atmosphere becomes colder
31The R-value of material is not related to its
- Acomposition
- Barea
- Cthickness
- Dresistance to heat flow
32An object with a very high specific heat will
- Adecrease in temperature very fast if removed from the source
- Blose its heat very fast
- Calways be water
- Dtake considerably more heat to raise its temperature
33The efficiency of an electric motor is the ratio of the
- Aenergy into the motor to the energy out of it
- Bheat released to rotational energy
- Cheat plus electricity produced to the electrical input
- Dshaft work output to the electrical energy input
34For a furnace to provide 80,000 Btu/h of thermal energy to a living space, what should the rate of heat supplied by the fuel be if the furnace efficiency is 65%?
- A103,000 Btu
- B15,300 Btu
- C123,000 Btu
- D223,000 Btu
35A heat engine ____
- Aconverts work into heat energy
- Bcan be 100% efficient in the absence of friction
- Ccan have no cold sink
- Dneeds a hot source and a cold sink to be able to work
36The heat transfer by conduction through an area 10ft x 7ft section of the wall, with R-value of 35 (ft^2-F-h/Btu), with temperature difference between the sides change in temperature equaling 10 degrees farenheit, will be
- A10 Btu/h
- B35 Btu/h
- C15 Btu/h
- D20 Btu/h
37Since the rate of heat transfer by conduction is proportion to the change in temperature, what percent savings in your cooling bill would you expect if you turned the thermostat up from 70 degrees to 74 degrees, and the outside temperature is 95 degrees?
- A26%
- B46%
- C6%
- D16%
38Thermal radiations are electromagnetic waves and like all EM waves are of the type
- Atransverse waves
- Blongitudinal waves
- Csurface waves
- Dtorsional waves
39Normally the phase changes from vapor to liquid to solid takes place in that order when the heat is
- Akept constant
- Bpressure is reduced
- Cadded
- Dremoved
4085 degrees Fahrenheit is equal to ____ temperature in Kelvin scale
- A286 K
- B308 K
- C316 K
- D302 K
41The Carnot efficiency (maximum possible efficiency) of a heat engine operating between 20 degrees C and 2000 degrees C will be about ____. (Note: the temperature must be in Kelvins -> C + 273)
- A35%
- B100%
- C72%
- D87%
42A heat pump will have an efficiency of about ____
- A35%
- B100%
- C200%
- D50%
43What are the percentages of Infra-Red (IR), Ultra Violet (UV), and Visible Light in the solar radiation at the top of the Earth's atmosphere?
- A17% IR, 37% UV, 46% visible
- B37% IR, 5% UV, 58% visible
- C51% IR, 12% UV, 37% visible
- D47% IR, 7% UV, 46% visible
44The amount of infrared radiation emitted, or absorbed, by an object, apart from the temperature difference with the surroundings, and the surface area, depends also on
- Ashape
- Bcolor, surface texture
- Cits type of material
- Ddensity
45What is the wavelength of the electromagnetic waves emitted by a Satellite-TV, that has typically a frequency of 12 GHz? (GHz= 10^9 Hz)
- A0.015 m
- B0.025 m
- C0.035 m
- D0.013 m
46Specific heat of a substance is defined as the
- Aheat required to increase its temper by one-degree Fahrenheit
- Bheat required to increase its temperature by one-degree Celsius
- Cheat required to increase its heat by one joule
- Dheat required to increase the temperature one one unite mass by one degree
47How much heat energy is required to increase the temperature of 3 kg of water from room temperature of 20 degrees C to the boiling point 100 degrees C? (Specific heat of water in SI units is C= 4186 J/kg*C)
- A20.4 kJ
- B50.6 kJ
- C100.5 kJ
- D789.7 kJ
48What produces the cooling in a refrigerator?
- Aevaporation of Freon outside
- Bcompression on Freon inside
- Ccondensation of Freon
- Devaporation of Freon inside
49The geothermal heat, that is, the heat from the interior of the earth, can be used to warm or cool a house
- Ain a certain area
- Bnear hot water springs
- Ceight feet below the ground everywhere
- Dmore than 100 feet underground
50A wall of a typical house is made of six layers with R-values given in (ft^2- F - h/Btu); from interior dead air later (R1= 0.68), 0.5 in sheetrock (R2= 0.45), 5.5 in fiberglass insulation (R3= 19), 0.5 in plywood (R4= 0.63), exterior dead air layer (R5 = 0.68). If temperature difference between outside and inside is 22 degrees F, and the total area of the wall is 360 ft^2 the rate of heat transfer by conduction is ____.
- A567.4 Btu/h
- B156.3 Btu/h
- C369.4 Btu/h
- D423.6 Btu/h
51The Carnot efficiency of a heat engine operating between 21 degrees C and 1200 degrees C will be about
- A52%
- B78%
- C80%
- D90%
52Amount of heat and temperature of an object are different because amount of heat depends on the
- Atemperature difference
- Benergy of its molecules
- Csize of its molecules
- Damount of substance
53The first law of thermodynamics is related to the
- Aconservation of energy
- Bheat and temperature
- Centropy and temperature
- Dheat and work
54To keep an iced drink cold for the longest time, what color cup would you use?
- Ared
- Bblue
- Cwhite
- Dblack
55Suppose it takes 48,000 Btu to heat up the water in a tank. If the heating element has an output of 2,800 W, then how long will it take to heat up the water, assuming no extra heat losses?
- A2 h
- B5 h
- C30 mins
- D3 h
56The existence of the four seasons, in the mid-latitude locations, is due to the
- Amoon-earth interaction
- Bvariation of the sun-earth distance
- Ctilt of rotation axis of the earth by 23.5 degrees
- Dvariation of the moon-earth distance
57Heat transfers by all three ways; conduction, convection, and radiation; are directly proportional to the....
- Asurface temperature
- Bsurface roughness
- Csurface color
- Dsurface area
58The optimal angle of tilt, from the horizontal, for a south facing flat-plate solar collector, or photovoltaic cells panel, in a location with the latitude of 50.5 degrees N, for the purpose of solar panels installation is
- A50.5 degrees
- B60.5 degrees
- C20.5 degrees
- D30.5 degrees
59What is the main advantage of using thermal mass, in the form of thick concrete floor, or Trombe wall, in a direct-gain passive solar system?
- Ato increase temperature fluctuations during the night
- Bto provide foundation support for the collector superstructure
- Cto increase the insolation on south-facing windows
- Dto reduce temperature fluctuations during the day
60During what season will more insolation be delivered to a vertical south-facing window on a clear day?
- Afall
- Bwinter
- Cspring
- Dsummer
61The insolation in a certain location is 900 W/m^2 and 85% of this is direct component on the collector. If a useful rate of energy needed for cooking is 150 W, then what area of the solar collector oven in the form of parabolic mirror is needed to intercept this amount of radiation, take the efficiency to 20%?
- A0.98 m^2
- B1.2 m^2
- C1.6 m^2
- D0.87 m^2
62Determine the collector area needed to heat 554 lbs of water (80 gallons), in one day, from 50 degrees F to 130 degrees F, if the insolation is 1700 Btu/d/ft^2 and the FPC efficiency is 48%.
- A54 ft^2
- B62 ft^2
- C73 ft^2
- D33 ft^2
63The main difference between transverse and longitudinal waves is that transverse waves
- Atravel faster than longitudinal waves
- Bare not shear waves
- Ccan not be polarized
- Dcan be polarized
64A typical microwave generates the electromagnetic waves of frequency 2.45 GHz (1 Giga= 10^9). The wavelength of the radio wave corresponding to the frequency is
- A9.26 cm
- B8.48 cm
- C11.45 cm
- D12.24 cm
65In prospection for ore by gravimetric method, (to measure the variation of g=9.8 m/s^2 on the earths surface at a fixed height) how do you distinguish between petroleum and ore?
- Ag would be greater over an ore deposit than a petroleum deposit
- Bdensity of ore is less than petroleum
- Cg does not change over the surface of the earth
- Dg would be greater over a petroleum deposit than an ore deposit
66When seismic waves (or light waves) travel from one medium into another medium with different wave-speed, what is the difference between reflection and refraction, at the interface between the two media?
- ARefracted wave bends and goes through the second medium
- Breflection and refraction are the same effect
- Creflection can only occur on a smooth interface
- Drefraction will not bend the direction of the waves
67What is the main difference between electromagnetic waves and sound waves?
- Aelectromagnetic waves can travel in a vacuum
- Bsound waves travel faster
- Csound waves can be polarized
- Dsound waves can travel in a vacuum
68The magnitude of gravitational attraction between a 135 kg-person and a 290,000 kg-door of a bunker, with 0.2 m distance between their centers of mass is ____. (G= 6.674 x 10^-11 n*m2/kg2)
- A6.53 x 10^-2 N
- B7.64 x 10^-3
- C8.75 x 10^-3
- D5.42 x 10^-2
69In a fractionating tower of an oil-refinery, where crude oil is heated from the bottom to separate different hydrocarbon constituents, what is the least volatile constituent of crude oil? That is, the component with the highest boiling point?
- Aindustrial fuel oil
- Bkerosene
- Cgasoline
- Dasphalt
70The longevity of a fossil-fuel reserve is determined by the ratio of
- Aproven reserves/ daily production production rate
- Bproven reserves / yearly production rate
- Cindicated reserves / yearly production rate
- Dinferred reserves yearly production rate
71Pressure on a surface inside a fluid is due to the
- Aforce of gravity
- Brotational energy of fluid molecules
- Csurface tension
- Dcontinuous knocking of fluid molecules on the surface
72Static pressure at a depth h below the surface of a fluid is given by
- Amass x g x h
- Bdensity x g x h
- Cforce x time x h
- Dh x g x volume
73A swimming pool has a depth of 2.5 m. What is the gauge pressure at the bottom of this pool, in psi? (Density of water is pw= 1000 kg/m3)
- A3.553 psi
- B4.652 psi
- C7.324 psi
- D1.334 psi
74The normal blood pressure is expressed as 80 to 120 mm-of-mercury, which are gauge pressure values. When these values are converted into psi they become ____
- A1.432, 2.133 psi
- B1.547, 2.320 psi
- C1.652, 2.358 psi
- D1.321, 2.142 psi
75A balloon in the air is buoyed up by a force equal to the
- Aweight of the air it displaces
- Bweight of the balloon and its contents
- Cmass of air displace
- Ddensity of the surrounding air
76What is the buoyant force on a 3 ton ship that is floating in the sea?
- A2.5 tons
- B3.0 tons
- C3.5 tons
- D1.5 tons
77Why do you expect photochemical smog to be a greater problem in a city like Los Angeles than in a heavily industrialized city like Pittsburgh?
- ALA has more automobile traffic
- BLA gets more days with temperature inversion
- CLA is less windy
- DPittsburg has more desulfurization plants
78The acidity of rain, or other solutions, is measured by the pH number scale that varies from 0 to 14. What does a pH number represent?
- A10 to the positive power of the hydrogen ion concentration
- Bthe larger the pH number the stronger the acidity
- Cthe smaller the pH number the less acidic the solution is
- D10 to the negative power of the hydrogen ion concentration in the solution
79The pressure exerted on your finger if you hold up a 15 lb box of apples, if the contact surface of your finger is 0.25 in x 0.25 in, would be ____
- A200 psi
- B220 psi
- C240 psi
- D160 psi
80Suppose it takes 38,500 Btu to heat up water in a tank. If the heating element has an output power of 2,500 W, then how long would it take to heat up the water, assuming no extra heat losses? (1 Btu= 1055 Joules, 1 Watt = 1 Joule per second, 1 hour = 3600 s)
- A55 mins
- B2.5 hours
- C3.5 hours
- D4.5 hours
81During which season will more insolation be delivered to a vertical south facing window on a clear day?
- AWinter
- BFall
- CSpring
- DSummer
82The optimum angle of tilt from the horizontal, for a flat plate solar collector, or panels of photovoltaic cells, both facing South, in a location with a latitude of 50.5 degrees North, for the purpose of solar panel installations is
- A30.5 degrees
- B40.5 degrees
- C50.5 degrees
- D60.5 degrees
83The measure of the angle of position of the sun from the South direction is called the
- Aaltitude
- Bazimuth
- Cdeclination
- Dinclination
84If the insolation (I) upon a flat plate collector is 890 (Btu/ft2*day), how large must the area A of the collector be to provide (Q/t= 12,400 Btu/hr of thermal energy for one day (24 hours)? Take the collector efficiency to be 57.5% (Note: Btu/h is related to I A and E by Q/t = I*A*E)
- A18 ft2
- B164 ft2
- C376 ft2
- D637 ft2
85The acidity of rain, or a solution, is measured by the pH number, that varies from 0 to 14, what does a pH number represent?
- A10 to the positive power represent the hydrogen ion concentration per mole
- Bthe larger the pH the stronger the acidity of the solution
- C10 to the negative power of the hydrogen ion concentration per mole in the solution
- Dthe smaller the pH the less acidic the solution
86Pressure on a surface is defined as
- Amass x speed
- Bmass x velocity
- Cdensity x volume
- Dforce per unit area
87Pressure on a surface inside a fluid is caused by
- Aweight of fluid molecules
- Bforce of gravity
- Cpotential energy of fluid molecules
- Drepeated knocking of the fluid molecules on the surface
88Static pressure at a depth h in a fluid is given by
- Ah x g x volume
- Bmass x g x h
- Cforce x time x h
- Ddensity x g x h
89Atmospheric pressure, at sea level, is 14.7 psi, the gauge pressure of an automobile tire is 38 psi, the absolute pressure of this tire in Pascal is..... (Note: 1 psi = 6895 Pa)
- A131,100 Pa
- B248,200 Pa
- C353,300 Pa
- D363,400 Pa
90A balloon in the air is buoyed up by a force equal to the ___
- Adensity of the surrounding air
- Batmospheric pressure
- Cweight of the balloon and its contents
- Dweight of the air it displaces
91Which of the following air pollutants is emitted in about equal amounts by stationary and mobile sources?
- Aparticulates
- Bcarbon monoxide
- Cnitrogen oxides
- Dsulfur dioxides
92Ozone layer in the stratosphere
- Adissipates within days
- Bcombines with NO or NO2 to produce smog
- Cabsorbs infrared light from the sun
- Dprovides protection from incoming UV solar radiation
93How much has the global temperature on earth changed over the past 100 years?
- A0.5 degrees C
- B1.0 degrees C
- C1.5 degrees C
- D2.0 degrees C
94One of the fundamentals of electrostatic is that the force between two unlike charges is
- Arepulsive
- Bneutralized
- Cattractive
- Dzero
95Electricity is transmitted from plower plants at ____ to reduce by Joule heating in the transmission lines, which is about 10%.
- Ahigh currents
- Blow resistance
- Chigh resistance
- Dhigh voltage
96What quantity is the same for three resistors in a series circuit?
- Apower
- Bresistance
- Ccurrent
- Dvoltage
97What quantity is the same for three resistors in a parallel circuit?
- Apower
- Bresistance
- Ccurrent
- Dvoltage
98A circuit consists of one lightbulb of resistance of 144 ohms and another lightbulb of 240 ohms that are wired in series to a 120 V wall socket outlet. What is the current through this circuit?
- A0.10 A
- B0.20 A
- C0.30 A
- D0.40 A
99Two resistors of 144 ohms and 240 ohms are wired in parallel to 120 V wall outlet socket outlet, the current through the 240 ohm resistor will be
- A0.3 A
- B0.4 A
- C0.5 A
- D0.6 A
100The electrostatic force of attraction between two charges of q1= -35 x 10^-6 C and q2 = +69 x 10^-6 C, separated by a distance of 3 m is ___
- A0.4 N
- B1.21 N
- C2.41 N
- D3.53 N
101A high temperature superconductor compounds such as YBCO ____
- Aprovides large magnetic fields at room temperature
- Bhas no resistance at room temperature
- Chas no electrical resistance below its critical temperature
- Dgenerates constant voltage at low temperatures
102A lightbulb draws a current of 2.5 amps, when connected to a wall outlet of 120 V. What is the resistance of the bulb?
- A50 ohms
- B100 ohms
- C200 ohms
- D300 ohms
103The resistance of four light bulbs are given below. Which one has the highest wattage?
- A144 ohms
- B192 ohms
- C240 ohms
- D320 ohms
104How much current is drawn by 3240 W electrical appliance operating at 240 V?
- A11.3 A
- B12.4 A
- C13.5 A
- D14.5 A
105What is the cost of running your water heater of power rating 2800 W for 2.5 hours per day, for one year or 365 days, if the electricity costs 12 cents per kWh?
- A$95
- B$105
- C$206
- D$307
106The magnetic field of a bar magnet is similar to that produced by
- Aa horse shoe magnet
- Ba straight current carrying wire
- Ctwo coils separated by long distance
- Da current carrying solenoid
107Alternating current has an advantage over direct current because
- Abatteries can be displaced in most circuits
- Belectrical generators can be made
- Cproduces no heat loss
- Done can step up, or down, the amount of voltage used
108A transformer (adaptor) can only operate if
- Athe power in equals the power out
- Ban alternating current is used
- Cthe potential difference is large enough
- Dwe step down the current
109If the current through a 33 ohm resister and a 57 ohm resistor in series is 5 A, then the total voltage drop across both of these resistors will be
- A110 V
- B120 V
- C340 V
- D450 V
110What transformer turns-ratio of secondary to primary is required to lower the voltage from 120 V wall socket outlet to 8 V for charging a cell phone?
- A15
- B0.044
- C0.075
- D0.067
111A bird sitting on a bare high voltage wire is not electrocuted because ____
- Aof the high resistance of its body
- Bits body is at a low electrical potential compared to the wire
- Cthe high voltage across its feet produced a small current
- Dthere is no electrical potential difference across its body because the other wire is out of reach
112For a photovoltaic cell of 0.5 V and of area 1 cm2, the maximum output power is 135 mW (mW= 10^-3 W). What is the current provided by this cell?
- A0.01 A
- B0.02 A
- C0.23 A
- D0.27 A
113The site location for a wind turbine is especially important. If the power output goes as the cube of the wind velocity, then which of the following average velocities will give approximately 8 times as much output as 10 mph winds?
- A5 mph
- B10 mph
- C15 mph
- D20 mph
114If the average wind speed for 24 hours is 16 mph at one site but 13 mph at another site for 12 hours and then 23 mph for 12 hours at another site, how much output can be expected from the first turbine compared to the turbine at the second site?
- A35%
- B46%
- C57%
- D68%
115A 1000 MW power plant is shut down for one day (24 hours). What is the loss of income from this plant if the selling price were 10 cents/kWh (1 MW=10^6 kW).
- A$180,000
- B$700,000
- C$2,400,000
- D$3,500,000
116For the following circuit, with all the bulbs identical, what is true for the brightness of the lights?
l -----------l (A)
l l_____
l (B) l l (C)
l _______ l ____ l- AA = B = C
- BA = 4B = 4C
- CA = .5B = .5C
- DA = B, C = 0
117The existence of atom was proposed by Democritus (420 BCE) and at the beginning of the 19th century, John Dolton proved that every element has an atom, by the ____
- Alaw of electrostatics
- Bideal gas law
- Claw of definite proportion
- Dlaw of conservation of energy
118The discovery of atomic nucleus was made by firing fast moving ____ at a thin gold foil
- Aalpha particles
- Bgamma rays
- Celectrons
- Dneutrons
119The isotopes of an element all have the same number of
- Aprotons
- Belectrons
- Cpositron neutrons
- Dnucleons
120For the same energy, the most penetrating type of radiations are
- AB-particles
- BX-rays
- Ca-particles
- Dy-rays
121The half-life of a radioactive nuclide is the time taken for _____
- Ahalf of its neutrons to decay
- Bhalf of its electrons to decay
- Chalf of its mass to decay
- Dhalf of its nuclei to decay
122At 9 am on Monday, a radioactive sample contained 80 million nuclei. At 9 am on Saturday, 2.5 million of these nuclei are left over and has not decayed. The half life of the sample is
- A1.5 days
- B1 day
- C5 days
- D4 days
123The radioactive isotope Cobalt-60 decays into Nickel-60 by beta emission, with a half life of 5.3 years. If we start with 100 gram of Co-60, after how many years will we have only 390 milligrams of it left?
- A20
- B42
- C89
- D6
124The activity of Carbon-14 in the living organism today is 15.3 disintegrations per minute, per gram. Half-life of Carbon-14 is 5730 years. If the activity of an archaeological sample, due to the carbon-14 is 3.825 disintegrations per min, per gram, how old is the sample?
- A2865
- B5730
- C11460
- D22920
125The binding energy of a Helium nucleus is 4.5 x 10^-12 Joules (28.4 MeV). What is the total binding energy of 4-grams (one mol.) of Helium that has avogadro's number NA= 6.02 x 10^23 of nuclei, when this mass is converted into radiant energy in the interior of the Sun?
- A1.7 x 10^11 J
- B2.7 x 10^12 J
- C1.2 x 10^10 J
- D3.4 x 10^13 J
126The pair production and annihilation refer to the simultaneous production of a particle and its anti-particle by two energetic gamma-ray photons, near a nucleus, and the destruction of a particle and an anti-particle, as a result of collision between them, these particles and anti-particles can be _____
- Aelectron and positron
- Bproton and electron
- Cproton and neutron
- Dtwo neutrons
127In the following fission reaction, the atomic number Z and mass number of nucleus A of the unknown element Y are:
(0/1)n + (92/235)U --> (53/135)I + (Z/A)Y + (0/2)n- A38, 102
- B39, 99
- C39, 100
- D37, 100
128If a light-weight stable nucleus has 12 neutrons, the atomic mass is expected to be _____. (1 atomic mass unit = 1.66 x 10^-27 kg).
- A18 amu
- B24 amu
- C36 amu
- D6 amu
Informações
- Descrição
- PHSC1100 Dr. Tavossi's Class. Fall 2014.
- Autor
- vburke59696
- Idioma
- English
- Visualizações
- 124
- Avaliação
- 4,0 de 5 · 2 avaliações Avalie este quiz