o Only the kinetic Energy of the system is conserved
· Both the kinetic Energy and Momentum of the system remain the same
o Total energy is not conserved
210. When the force and displacement are parallel to each other, then work is __________.
o Minimum
· Maximum
o None of these
o Depends on force magnitude
211. In rotational motion, the quantity, which plays the same role as the inertial mass in linear motion, is called ___________.
o Inertia
o Angular momentum
· Moment of inertia
o Torque
o Center of mass
212. Pairs of forces of equal magnitude act on identical cylinders as shown in the figures. In which example is the cylinder in translational and rotational equilibrium?
o 
· 
o 
o 
o 
213. Four identical particles, each with mass m, are arranged in the x, y plane as shown. They are connected by light sticks to form a rigid body. If m = 2.0 kg and a = 1.0 m, the rotational inertia of this array about the y -axis is: 
o 4.0 kg Ч m2
· 12 kg Ч m2
o 9.6 kg Ч m2
o 4.8 kg Ч m2
o none of these
214. Three identical objects, each of mass M, are fastened to a massless rod of length L as shown. The rotational inertia about one end of the rod of this array is: 
o ML 2/2
o ML 2
o 3 ML 2/2
· 5 ML 2/4
o 3 ML 2
215. How defines period of physical pendulum?
o 
· 
o 
o 
216. Find a sample of the physical pendulum:
o 
o 
· 
o 
217. A sound wave can be characterized as
o A transverse wave
· A longitudinal wave
o A transverse wave or a longitudinal wave, depending on the nature of its source
o One that carries no energy
o A wave that does not require a medium to be transmitted from one place to the other
218. Sound travels faster in
o a vacuum
o water
· steel
o air
o Sound travels at about the same speed in all of the above media.
219. A woman sits on a spinning stool with her arms folded. When she extends her arms, which of the following occurs
o She increases her moment of inertia, thus increasing her angular speed
· She increases her moment of inertia, thus decreasing her angular speed.
o She decreases her moment of inertia, thus increasing her angular speed
o She decreases her moment of inertia, thus decreasing her angular speed
o Her angular speed remains constant by conservation of angular momentum
220. The pressure at the surface of the ocean is 1 atm (1 x 105 Pa). At what approximate depth in the ocean water (ρ = 1025 kg/m3) would the absolute pressure be 2 atm?
o 1 m
o 5 m
· 10 m
o 100 m
o 1000 m
221. What is the direction of angular momentum for the bowling ball that rotates about z-axis? 
o +y
o –y
o +x
o –x
· +z
o –z
222. A parallel-plate capacitor with air between the plates has an area A =2.00·104 m2 and a plate separation d =1.00 mm. Find its capacitance.
· C=1.77 pF
o C=1.77 F
o C=1.77 mF
o C=1.77 nF
o No correct answer
223. Find the equivalent capacitance between a and b for the combination of capacitors shown in Figure. All capacitances are in microfarads. 
· 6.0 μF
o 6.0 F
o 5.0 μF
o 6.0 nF
o No correct answer
224. A parallel-plate capacitor has plates of dimensions 2.0 cm by 3.0 cm separated by a 1.0-mm thickness of paper. Find its capacitance (k = 3.7, ε0=8.85·10-12 C2/N·m2).
· 20 pF
o 20 F
o 40 pF
o 60 pF
225. Find the electric flux Φe though the spherical surface, covers the point-like charges q1=5 nC and q2=-2 nC. (ε0=8.85·10-12 C2/N·m2)
· Φe=339 N·m2/C
o Φe=0.339 N·m2/C
o Φe=339 N/C
o Φe=339 N·m2
o No correct answer
226. Find the attractive force F between nuclei of hydrogen atom and electron. Radius of hydrogen atom is r=0.5·10-10 m; modules charge of nuclei are equaland opposite to charge sign of electron (ε0=8.85·10-12 C2/N·m2).
· F=92.3·10-9 N
o F=92.3 N
o F=92.3·10-9 N/m2
o F=92.3·10-9 N
o No correct answer
227. Two point-like charges in air (ε=1) at the distance r1=20 sm from each other interact with some force. At what distance r2 one needs to place this charges in oil (ε2=5) to get the same force of interaction?
· r2=8.94 sm
o r2=8.94 m
o r2=8.94·103 m
o r2=8.94·10-3 m
o No correct answer
228. What times the gravitational force between two protons less the electrostatic force of their repulsion? The charge of proton is equal on module and opposite on sign of charge of electron.
· 
o 
o 
o 
o No correct answer
229. The electron and proton of a hydrogen atom are separated (on the average) by a distance of approximately 5.3·10-11 m. Find the magnitudes of the electric force between the two particles. (ke=8.99·109 N·m2/C2)
· 8.2·10-8 N
o 8.2 N
o 8.2·10-9 N
o 8.2·109 N
o No correct answer
230. Calculate the resistance of an aluminum cylinder that has a length of 10.0 cm and a cross-sectional area of 2.00·10-4 m2 (ρ=2.82·10-8 Ω·m).
· R= 1.4·10-5 Ω
o R= 1.4·10-3 Ω
o R= 1.4 Ω
o R= 1.4·105 Ω
o No correct answer
231. Calculate the resistance of an glass cylinder that has a length of 10.0 cm and a cross-sectional area of 2.00·10-4 m2 (ρ=3·1010 Ω·m).
· R= 1.5·1013 Ω
o R= 1.5·10-13 Ω
o R= 1.5·1013 Ω
o R= 1.5·103 Ω
o No correct answer
232. Calculate the resistance per unit length of a 22-gauge Nichrome wire, which has a radius of 0.321 mm (The resistivity of Nichrome is 1.5·10-6 Ω·m).
· 4.6 Ω/m
o 4.6 Ω
o 4.6 Ω·m
o 4.6·10-3 Ω/m
o No correct answer
233. If a potential difference of 10 V is maintained across a 1.0-m length of the Nichrome wire with resistance 4.6 Ω, what is the current in the wire?
· 2.2 A
o 0.46 A
o 2.2·10-3 A
o 0.46·103 A
o No correct answer
234. An electric heater is constructed by applying a potential difference of 120 V to a Nichrome wire that has a total resistance of 8.00 Ω. Find the current carried by the wire.
· 15 A
o 0.06 A
o 15·10-3 A
o 0.06·10-3 A
o No correct answer
235. An electric heater is constructed by applying a potential difference of 120 V to a Nichrome wire that has a total resistance of 8.00 Ω. Find the power rating of the heater.
· 1.8 kW
o 1.8 W
o 120 W
o 0.1 kW
o No correct answer
236. A battery has an emf of 12.0 V and an internal resistance of 0.05 Ω. Its terminals are connected to a load resistance of 3.00 Ω. Find the terminal voltage of the battery.
· 11.8 V
o 8.07 V
o 11.95 A
o All answers are correct
o No correct answer
237. Calculate the power delivered to the load resistor, if the current in the circuit is 3.93 A, the load resistance is 3.00 Ω.
· 46.3 W
o 11.79 W
o 35.37 W
o All answers are correct
o No correct answer
238. Calculate the power delivered to the internal resistance of the battery, if the current in the circuit is 3.93 A, the internal resistance of 0.05 Ω.
· 0.772 W
o 0.1965 W
o 0.01 W
o All answers are correct
o No correct answer
239. Four resistors are connected as shown in Figure. Find the equivalent resistance between points a and b. 
· 12 Ω
o 2.7 Ω
o 5.37 Ω
o All answers are correct
o No correct answer
240. Four resistors are connected as shown in Figure. Find the equivalent resistance between points b and c.
· 2 Ω
o 0.5 Ω
o 9 Ω
o All answers are correct
o No correct answer
241. Four resistors are connected as shown in Figure. Find the equivalent resistance between points a and c.
· 14 Ω
o 2.5 Ω
o 4.7 Ω
o 3.2 Ω
o No correct answer
242. Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Find the current I1. 
· I1=6.00 A
o I1=3.00 A
o I1=2.00 A
o All answers are correct
o No correct answer
243. Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Find the current I2. 
o I1=6.00 A
· I1=3.00 A
o I1=2.00 A
o All answers are correct
o No correct answer
244. Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Find the current I3.
o I1=6.00 A
o I1=3.00 A
· I1=2.00 A
o All answers are correct
o No correct answer
245. Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Calculate the power delivered to resistor R1. 
· P1=108 W
o P1=54 W
o P1=36 W
o All answers are correct
o No correct answer
246. Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Calculate the equivalent resistance of the circuit. 
· Req=1.64 Ω
o Req=0.61 Ω
o Req=18 Ω
o All answers are correct
o No correct answer
247. A single-loop circuit contains two resistors and two batteries, as shown in Figure. (Neglect the internal resistances of the batteries.) Find the current in the circuit. 
· I=-0.33 A
o I=0.33 A
o I=1 A
o I=-3 A
o No correct answer
248. A segment of steel railroad track has a length of 30.000 m when the temperature is 0.0°C. What is its length when the temperature is 40.0°C? (Average linear expansion coefficient for steel is α=11* 10-6 °C-1).
o 0.013 m.
· 30.013 m.
o 30.130 m.
o 30.003 m.
o 31.013 m.
249. An ideal gas occupies a volume of 100 cm3 at 20°C and 100 Pa. Find the number of moles of gas in the container (Universal gas constant R= 8.314 J/mol*K).
o 4.11 * 10-5 mol
o 20.11 * 10-6 mol
o 20.11 * 10-5 mol
o 1.20 * 10-6 mol
· 4.11 * 10-6 mol
250. The concrete sections of a certain superhighway are designed to have a length of 25.0 m. The sections are poured and cured at 10.0°C. What minimum spacing should the engineer leave between the sections to eliminate buckling if the concrete is to reach a temperature of 50.0°C? (Average linear expansion coefficient for concrete is α=12* 10-6 °C-1).
· 1.20 cm
o 1.25 cm
o 1.35 cm
o 25.20 cm
o 25.40 cm
251. Just 9.00 g of water is placed in a 2.00-L pressure cooker and heated to 500°C. What is the pressure inside the container? (Molar mass of water M (H2O) = 18 g/mol, universal gas constant R= 8.314 J/mol*K).
o 16.1 Pa
o 1.61 Pa
· 1.61 MPa
o 161 MPa
o 161 Pa
252. The temperature of a silver bar rises by 10.0°C when it absorbs 1.23 J of energy by heat. The mass of the bar is 525 g. Determine the specific heat of silver.
o 128 J/kg . °C
· 234 J/kg . °C
o 380 J/kg . °C
o 860 J/kg . °C
o 2 010 J/kg . °C
253. A 50.0-g sample of copper is at 25.0°C. If 1 200 J of energy is added to it by heat, what is the final temperature of the copper? (Specific heat of copper c= 387 J/kg . °C).
o 50 °C
o 62 °C
o 77 °C
· 87°C
o 99 °C
254. 
Determine the work done on a fluid that expands from i to f as indicated in Figure.
o 12 MJ
o -12 J
· -12 MJ
o -6 J
o 6 MJ
255. 
A gas is taken through the cyclic process described in Figure. Find the net energy transferred to the system by heat during one complete cycle.
· 12 kJ
o 12 J
o 1200 kJ
o 4 kJ
o 6 kJ
256. An ideal gas initially at 300 K undergoes an isobaric expansion at 2.50 kPa. If the volume increases from 1.00 m3 to and 12.5 kJ is transferred to the gas by heat, what is the change in its internal energy?
o 6.5 kJ
o 6.5 kJ
· 7.5 kJ
o 13.5 kJ
o 25 kJ
257. A glass window pane has an area of 3.00 m2 and a thickness of 0.600 cm. If the temperature difference between its faces is 25.0°C, what is the rate of energy transfer by conduction through the window? (Thermal conductivity of glass k= 0.8 W/m* °C)
o 10 W
o 100 W
o 100 kW
o 1 kW
· 10 kW
258. A cylinder contains a mixture of helium and argon gas in equilibrium at 150°C. What is the average kinetic energy for each type of gas molecule? (Boltzmann constant kB= 1.38* 10-23 J/K).
o 8.76* 10-23 J
· 8.76* 10-21 J
o 10.8* 10-21 J
o 10.8* 10-23 J
o 87.6* 10-21 J
259. Calculate the change in internal energy of 3.00 mol of helium gas when its temperature is increased by 2.00 K (Universal gas constant R= 8.314 J/mol*K).
o 49.9 J
o 4.99 J
o 499 J
o 748 J
· 74.8 J
260. A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. What is the final pressure of the gas?
o 5.33 atm
o 4.21 atm
o 3.39 atm
o 2.91 atm
· 1.39 atm
261. A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. What are the initial and final temperatures? (Universal gas constant R= 8.314 J/mol*K, 1 atm= 1.013* 105 Pa)
· 365 K, 253 K
o 355 K, 243 K
o 345 K, 233 K
o 335 K, 223 K
o 325 K, 213 K
262. A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. Find Q, Δ E int, and W (Universal gas constant R= 8.314 J/mol*K).
o 0 J, -4.66 kJ, 4.66 kJ
o 0 J, 4.66 kJ, - 4.66 kJ
· 0 J, -4.66 kJ, - 4.66 kJ
o 0 J, 4.66 kJ, 4.66 kJ
o 0.66 J, -4.66 kJ, - 4.66 kJ
263. A heat engine takes in 360 J of energy from a hot reservoir and performs 25.0 J of work in each cycle. Find the efficiency of the engine.
· 6.94 %
o 14.4 %
o 23.25 %
o 45.2 %
o 100 %
264. A heat engine performs 200 J of work in each cycle and has an efficiency of 30.0%. For each cycle, how much energy is (a) taken in and (b) expelled by heat?
o 637 J, 437 J
o 647 J, 447 J
o 657 J, 457 J
· 667 J, 467 J
o 677 J, 477 J
265. A particular heat engine has a useful power output of 5.00 kW and an efficiency of 25.0%. The engine expels 8 000 J of exhaust energy in each cycle. Find the energy taken in during each cycle
· 10.7 kJ
o 11.7 kJ
o 12.7 kJ
o 13.7 kJ
o 14.7 kJ
266. The unit for permeability is
· Wb/At Ч m
o At/m
o At/Wb
o Wb
267. What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?
o 18.75 At
o 30 At
· 300 At
o 187 At
268. The direction of a magnetic field within a magnet is
· from south to north
o from north to south
o back to front
o front to back
269. When the north poles of two bar magnets are brought close together, there will be
o no force
o a downward force
o a force of attraction
· a force of repulsion
270. The ability of a material to remain magnetized after removal of the magnetizing force is known as
o permeability
o reluctance
o hysteresis
· retentivity
271. The voltage induced across a certain coil is 200 mV. A 120 
resistor is connected to the coil terminals. The induced current is
· 1.7 mA
o 16 mA
o 12 mA
o 120 mA
272. The induced voltage across a stationary conductor in a stationary magnetic field is
· zero
o reversed in polarity
o increased
o decreased
273. When a solenoid is activated, the force that moves the plunger is
· an electromagnetic field
o a permanent magnetic field
o varying voltage
o a steady current
274. What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?
o 2,400 At
o 240 At
· 24 At
o 2.4 At
275. If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
o remains unchanged
o reverses polarity
· increases
o decreases
276. If an electron moves perpendicular to the uniform magnetic field of magnitude 0.35 T with the speed equal to 4.69Ч106, what is the radius of its circular orbit? (me = 9.11Ч10-31kg)
o 7.63Ч104
· 7.63Ч10-5
o 7.63Ч106
o 0.73Ч10-6
277. Calculate the maximum kinetic energy of protons in a cyclotron of radius 0.50 m in a magnetic field of 0.35 T.
o 1.46 KeV
o 1.46 meV
· 1.46 MeV
o 0.146 eV
278. A rectangular copper strip 1.5 cm wide and 0.1 cm thick carries a current of 5 A. A 1.2 T magnetic field is applied perpendicular to the strip. Find the Hall voltage that should be produced.
· 0.442 µV
o 0.442 mV
o 4.42 V
o 44.2 V
An ac voltage is applied directly across an 8 µF capacitor. The frequency of the source is 3 kHz, and the voltage amplitude is 30V. Find the voltage across the capacitor in terms of time.
o 
o 
o 
· 
279. An ac voltage is applied directly across an 8 µF capacitor. The frequency of the source is 3 kHz, and the voltage amplitude is 30V. Find the displacement current between the plates of the capacitor.
o 
· 
o 
o 
280. A toroidal winding carrying a current of 5 A is wound with 300 turns/m of wire. The core is iron, which has a magnetic permeability of 5000µ0 under the given conditions. Find H inside the iron core.
· 1500 
o 150 
o 15 
o 1.5
281. A toroidal winding carrying a current of 5 A is wound with 300 turns/m of wire. The core is iron, which has a magnetic permeability of 5000µ0 under the given conditions. Find B inside the iron core.
o 9.43 
T
o 9.43 
T
o 0.943 T
· 9.43 T
282. Assume that a motor having coils with a resistance of 10 Ω is supplied by a voltage of 120 V. When the motor is running at its maximum speed, the back emf is 70V. Find the current in the coils when the motor is first turned on.
o 10 A
· 12 A
o 1 A
o 1.2 A
283. Assume that a motor having coils with a resistance of 10 Ω is supplied by a voltage of 120 V. When the motor is running at its maximum speed, the back emf is 70 V. Find the current in the coils when the motor has reached maximum speed.
o 3 A
o 4 A
· 5 A
o 6 A
284. Calculate the inductance of a solenoid containing 300 turns if the length of the solenoid is 25 cm and its cross-sectional area is 4 cm2.
· 0.181 mH
o 0.181 H
o 1.81 mH
o 1.81 H
285. Calculate the self-induced emf in the solenoid containing 300 turns if the length of the solenoid is 25 cm and the current through it is decreasing at the rate of 50 A/s.
o 0.905 mV
· 9.05 mV
o 0.905 V
o 9.05 V
286. Calculate the time constant of RL circuit consisting of a 30 mH inductor in series with 6 Ω resistor and 12 V battery.
o 180 ms
o 60 ms
· 5 ms
o 2 ms
287. Three identical capacitors connected in series. What single capacitance C is “equivalent” to this combination?
o 6C
o 3C
o (1/6)C
· (1/3)C
o 2C
288. You charge parallel-plate capacitor. When you pull the plates apart to a larger separation and battery remains connected to the capacitor
· Decreases
o Remains the same
o Alternates
o Increases
o Changes in an unpredictable way
289. The resonant angular frequency of series RLC circuit is
· 1/(LC)1/2
o LC
o (LC)2
o (LC)1/2
o 1/(LC)
290. A wire of area 2 mm2 carries a current of 0.4mA. The average current density is
o 0.02A/m2
o 0.2 A/m2
o 2 A/m2
· 200 A/m2
o 20 A/m2
291. A square loop of side 0.1m carries 2A current. The magnetic dipole moment of the loop is
o 10-1 Am2
· 2*10-2 Am2
o 1 Am2
o 10 Am2
o 100 Am2
292. Current 0.5A flows in square wire loop of 10 cm side. What is magnetic dipole moment of the loop?
o 50 Am2
· 0.005 Am2
o 0.05 Am2
o 5 Am2
o 0.5 Am2
293. Of the three chief kinds of magnetic materials (diamagnetic, paramagnetic and ferromagnetic), which are used to make permanent magnets?
o Only paramagnetic
o All three
o Paramagnetic and ferromagnetic
· Only ferromagnetic
o Only diamagnetic
294. In a photoelectric experiment at a frequency above cut off, the stopping potential is proportional to:
o The energy of the most energetic electron before it is ejected
o The energy of the least energetic electron before it is ejected
· The energy of the most energetic electrons after it is ejected
o The electron potential energy at the surface of the sample
o The energy of the least energetic electron after it is ejected
295. What is the maximal number of electrons at shell with n=3
o 11
· 18
o 9
o 7
o 3
296. For the serial circuit work out the readings on the voltmeters V1 and V2 given the following values for R1=2Ohm and R2=10 Ohm, I1=1A, I2=1A
o V1=1V; V2=5V;
o V1=5V; V2=10V;
o V1=4V; V2=1V;
o V1=10V; V2=2V;
· V1=2V; V2=10V;
297. What is a good insulator of electricity?
Дата добавления: 2015-11-04; просмотров: 18 | Нарушение авторских прав
| <== предыдущая лекция | | | следующая лекция ==> |