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Xes. In the figure velocity of the cr s function of time is shown in three prts I II III.html

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  1.  A ball is thrown upward. While the ball is in free fall, does its acceleration
  •  Increases
  •  Decreases
  •  Increases and then decreases
  •  Decreases and then increases
  •  Remain constant
  1.  After a ball is thrown upward and is in the air, its speed in all path
  •  Increases
  •  Decreases
  •  Increases and then decreases
  •  Decreases and then increases
  •  Remain the same
  1.  If vector B is added to vector A, which two of the following choices must be true in order for the resultant vector to be equal to zero?
  •  A nd B are parallel in the same direction and have same magnitude
  •  A and B are parallel in opposite directions, but have same magnitude
  •  A and B have the same magnitude
  •  A and B are perpendicular but have same magnitude
  •  None of them is right
  1.  A car moves along y-axes. In the figure, velocity of the car as a function of time is shown in three parts (I, II, III). Which statement is ALWAYS true? 
  •  Velocity is constant in part II
  •  A car drives backward in part I
  •  Velocity is negative in part III
  •  Velocity is negative in part I
  •  Nothing is true
  1.  What is the cross product of two vectors A and B, if the angle between them is 30 degree, and magnitudes are |A|=4, |B|=2
  •  5.6
  •  4
  •  0
  •  8
  •  2.5
  1.  When a box rests on the floor, it is acted upon by the gravitational and the _________________ force.
  •  Centrifugal
  •  Acceleration
  •  Normal
  •  Inertia
  •  Friction
  1.  Motion is produced by
  •  all forces
  •  unbalanced forces
  •  balanced forces
  •  the absence of force
  •  none of them
  1.  Force is that agent which produces or tends to produce the __________.
  •  Speed in the body
  •  Acceleration in the body
  •  Constant velocity in the body
  •  Constant angular velocity in the body
  •  mass
  1.  A force of 3N acts perpendicularly to a force of 4N. Their resultant has magnitude of ______
  •  1N
  •  5N
  •  7N
  •  9N
  •  25N
  1.  In inelastic collision between the two bodies __________.
  •  Only momentum of the system is conserved
  •  Only the kinetic Energy of the system is conserved
  •  Both the kinetic Energy and Momentum of the system remain the same
  •  Total energy is not conserved
  •  Angular momentum is conserved
  1.  Work done by a grass cutter is maximum when he pulls it __________.
  •  Making an angle 450 with the floor
  •  Making an angle 900 with the floor
  •  Along a line parallel to the floor
  •  Making an angle 600 with the floor
  •  Making an angle 550 with the floor
  1.  A man does the work if he ___________.
  •  Goes to fifth floor of the building
  •  Goes to fifth floor of the building and comes back to ground floor
  •  Remain on the ground floor
  •  Goes to the basement and comes back to ground floor
  •  Goes to fourth floor of the building and comes back to ground floor
  1.  In elastic collision between the two bodies __________.
  •  Only momentum of the system is conserved
  •  Only the kinetic Energy of the system is conserved
  •  Both the kinetic Energy and Momentum of the system remain the same
  •  Total energy is not conserved
  •  Angular momentum is conserved
  1.  When the constant force and displacement are parallel to each other, then work is __________.
  •  Minimum
  •  Maximum
  •  None of these
  •  Depends on force magnitude
  •  Changes with time
  1.  In rotational motion, the quantity, which plays the same role as the inertial mass in linear motion, is called ___________.
  •  Inertia
  •  Angular momentum
  •  Moment of inertia
  •  Torque
  •  Center of mass
  1.  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?
  •  
  •  
  •  
  •  
  •  
  1.  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:
  •  4.0 kg m2
  •  12 kg m2
  •  9.6 kg m2
  •  4.8 kg m2
  •  none of these
  1.  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:
  •  ML2/2
  •  ML2
  •  3ML2/2
  •  5ML2/4
  •  3ML2
  1.  How defines period of physical pendulum?
  •  
  •  
  •  
  •  
  •  No correct answer
  1.  Find a sample of the physical pendulum:
  •  
  •  
  •  
  •  
  •  None of them
  1.  A sound wave can be characterized as
  •  A transverse wave
  •  A longitudinal wave
  •  A transverse wave or a longitudinal wave, depending on the nature of its source
  •  One that carries no energy
  •  A wave that does not require a medium to be transmitted from one place to the other
  1.  Sound travels faster in
  •  a vacuum
  •  water
  •  steel
  •  air
  •  Sound travels at about the same speed in all of the above media.
  1.  A woman sits on a spinning stool with her arms folded. When she extends her arms, which of the following occurs
  •  She increases her moment of inertia, thus increasing her angular speed
  •  She increases her moment of inertia, thus decreasing her angular speed.
  •  She decreases her moment of inertia, thus increasing her angular speed
  •  She decreases her moment of inertia, thus decreasing her angular speed
  •  Her angular speed remains constant by conservation of angular momentum
  1.  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?
  •  1 m
  •  5 m
  •  10 m
  •  100 m
  •  1000 m
  1.  What is the direction of angular momentum for the bowling ball that rotates about z-axis? 
  •  +y
  •  –y
  •  +x
  •  –x
  •  +z
  •  –z
  1.  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
  •  C=1.77 F
  •  C=1.77 mF
  •  C=1.77 nF
  •  No correct answer
  1.  Find the equivalent capacitance between a and b for the combination of capacitors shown in Figure. All capacitances are in microfarads. 
  •  6.0 μF
  •  6.0 F
  •  5.0 μF
  •  6.0 nF
  •  No correct answer
  1.  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
  •  20 F
  •  40 pF
  •  60 pF
  •  80 pF
  1.  Find the electric flux though the spherical surface, covers the point-like charges q1=5 nC and q2=-2 nC. (ε0=8.85·10-12 C2/N·m2)
  •  339 N·m2/C
  •  0.339 N·m2/C
  •  339 N/C
  •  339 N·m2
  •  No correct answer
  1.  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 equal and opposite to charge sign of electron (ε0=8.85·10-12 C2/N·m2).
  •  F=92.3·10-9 N
  •  F=92.3 N
  •  F=92.3·10-9 N/m2
  •  F=92.3·10-9 N
  •  No correct answer
  1.  Two point-like charges in air (ε=1) at the distance r1=20 сm 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 сm
  •  r2=8.94 m
  •  r2=8.94·103 m
  •  r2=8.94·10-3  m
  •  No correct answer
  1.  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.
  •  
  •  
  •  
  •  
  •  No correct answer
  1.  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
  •  8.2 N
  •  8.2·10-9 N
  •  8.2·109 N
  •  No correct answer
  1.  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 Ohm·m).
  •  R=1.4·10-5 Ohm
  •  R=1.4·10-3 Ohm
  •  R=1.4 Ohm
  •  R=1.4·105 Ohm
  •  No correct answer
  1.  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 Ohm·m).
  •  R=1.5·1013 Ohm
  •  R=1.5·10-13 Ohm
  •  R=1.5·1013 Ohm
  •  R=1.5·103 Ohm
  •  No correct answer
  1.  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 Ohm·m).
  •  4.6 Ohm/m
  •  4.6 Ohm
  •  4.6 Ohm·m
  •  4.6·10-3  Ohm/m
  •  No correct answer
  1.  If a potential difference of 10 V is maintained across a 1.0-m length of the Nichrome wire with resistance 4.6 Ohm, what is the current in the wire?
  •  2.2 A
  •  0.46 A
  •  2.2·10-3 A
  •  0.46·103 A
  •  No correct answer
  1.  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 Ohm. Find the current carried by the wire.
  •  15 A  
  •  0.06 A
  •  15·10-3  A
  •  0.06·10-3 A
  •  No correct answer
  1.  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 Ohm. Find the power rating of the heater.
  •  1.8 kW
  •  1.8 W
  •  120 W
  •  0.1 kW
  •  No correct answer
  1.  A battery has an emf of 12.0 V and an internal resistance of 0.05 Ohm. Its terminals are connected to a load resistance of 3.00 Ohm. Find the terminal voltage of the battery.
  •  11.8 V
  •  8.07 V
  •  11.95 A
  •  All answers are correct
  •  No correct answer
  1.  Calculate the power delivered to the load resistor, if the current in the circuit is 3.93 A, the load resistance is 3.00 Ohm.
  •  46.3 W
  •  11.79 W
  •  35.37 W
  •  All answers are correct
  •  No correct answer
  1.  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 Ohm.
  •  0.772 W
  •  0.1965 W
  •  0.01 W
  •  All answers are correct
  •  No correct answer
  1.  Four resistors are connected as shown in Figure. Find the equivalent resistance between points a and b. 
  •  12 Ohm
  •  2.7 Ohm
  •  5.37 Ohm
  •  All answers are correct
  •  No correct answer
  1.  Four resistors are connected as shown in Figure. Find the equivalent resistance between points b and c. 
  •  2 Ohm
  •  0.5 Ohm
  •  9 Ohm
  •  All answers are correct
  •  No correct answer
  1.  Four resistors are connected as shown in Figure. Find the equivalent resistance between points a and c.
  •  14 Ohm
  •  2.5 Ohm
  •  4.7 Ohm
  •  3.2 Ohm
  •  No correct answer
  1.  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
  •  I1=3.00 A
  •  I1=2.00 A
  •  All answers are correct
  •  No correct answer
  1.  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.
  •  I1=6.00 A
  •  I1=3.00 A
  •  I1=2.00 A
  •  All answers are correct
  •  No correct answer
  1.  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. 
  •  I1=6.00 A
  •  I1=3.00 A
  •  I1=2.00 A
  •  All answers are correct
  •  No correct answer
  1.  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
  •  P1=54 W
  •  P1=36 W
  •  All answers are correct
  •  No correct answer
  1.  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 Ohm
  •  Req=0.61 Ohm
  •  Req=18 Ohm
  •  All answers are correct
  •  No correct answer
  1.  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
  •  I=0.33 A
  •  I=1 A
  •  I=-3 A
  •  No correct answer
  1.  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).
  •  0.013 m
  •  30.013 m
  •  30.130 m
  •  30.003 m
  •  31.013 m
  1.  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).
  •  4.11 * 10-5 mol
  •  20.11 * 10-6 mol
  •  20.11 * 10-5 mol
  •  1.20 * 10-6 mol
  •  4.11 * 10-6 mol
  1.  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
  •  1.25 cm
  •  1.35 cm
  •  25.20 cm
  •  25.40 cm
  1.  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 ).
  •  16.1 Pa
  •  1.61 Pa
  •  1.61 MPa
  •  161 MPa
  •  161 Pa
  1.  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.
  •  128 J/kg . °C
  •  234 J/kg . °C
  •  380 J/kg . °C
  •  860 J/kg . °C
  •  2 010 J/kg . °C
  1.  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).
  •  50 °C
  •  62 °C
  •   77 °C
  •  87°C
  •  99 °C
  1.  Determine the work done on a fluid that expands from i to f as indicated in Figure. 
  •  12 MJ
  •  -12 J
  •  -12 MJ
  •  -6 J
  •  6 MJ
  1.  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
  •  12 J
  •  1200 kJ
  •  4 kJ
  •  6 kJ
  1.  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?
  •  6.5 kJ
  •  6.5 kJ
  •  7.5 kJ
  •  13.5 kJ
  •  25 kJ
  1.   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)
  •  10 W
  •  100 W
  •  100 kW
  •  1 kW
  •  10 kW
  1.  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).
  •  8.76* 10-23 J
  •  8.76* 10-21 J
  •  10.8* 10-21 J
  •  10.8* 10-23 J
  •  87.6* 10-21 J
  1.  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 ).
  •  49.9 J
  •  4.99 J
  •  499 J
  •  748 J
  •  74.8 J
  1.  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?
  •  5.33 atm
  •  4.21 atm
  •  3.39 atm
  •  2.91 atm
  •  1.39 atm
  1.  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
  •  355 K, 243 K
  •  345 K, 233 K
  •  335 K, 223 K
  •  325 K, 213 K
  1.  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, ΔEint, and W (Universal gas constant R= 8.314 J/mol*K).
  •  0  J, -4.66 kJ, 4.66 kJ
  •  0  J, 4.66 kJ, - 4.66 kJ
  •  0  J, -4.66 kJ, - 4.66 kJ
  •  0  J, 4.66 kJ, 4.66 kJ
  •  0.66  J, -4.66 kJ, - 4.66 kJ
  1.  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 %
  •  14.4 %
  •  23.25 %
  •  45.2 %
  •  100 %
  1.  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?
  •  637 J, 437 J
  •  647 J, 447 J
  •  657 J, 457 J
  •  667 J, 467 J
  •  677 J, 477 J
  1.  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
  •  11.7 kJ
  •  12.7 kJ
  •  13.7 kJ
  •  14.7 kJ
  1.  The unit for permeability is
  •  Wb/At × m
  •  At/m
  •  At/Wb
  •  Wb
  •  No correct answer
  1.  What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?
  •  18.75 At
  •  30 At
  •  300 At
  •  187 At
  •  No correct answer
  1.  The direction of a magnetic field within a magnet is
  •  from south to north
  •  from north to south
  •  back to front
  •  front to back
  •  No correct answer
  1.  When the north poles of two bar magnets are brought close together, there will be
  •  no force
  •  a downward force
  •  a force of attraction
  •  No correct answer
  •  a force of repulsion
  1.  The ability of a material to remain magnetized after removal of the magnetizing force is known as
  •  permeability
  •  reluctance
  •  No correct answer
  •  hysteresis
  •  retentivity
  1.  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
  •  16 mA
  •  12 mA
  •  120 mA
  •  No correct answer
  1.  The induced voltage across a stationary conductor in a stationary magnetic field is
  •  zero
  •  reversed in polarity
  •  increased
  •  decreased
  •  no correct answer
  1.  When a solenoid is activated, the force that moves the plunger is
  •  an electromagnetic field
  •  a permanent magnetic field
  •  varying voltage
  •  a steady current
  •  no correct answer
  1.  What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?
  •  2,400 At
  •  240 At
  •  24 At
  •  2.4 At
  •  244 At
  1.  If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
  •  remains unchanged
  •  reverses polarity
  •  increases
  •  decreases
  •  no correct answer
  1.  If an electron moves perpendicular to the uniform magnetic field of magnitude 0.35 T with the speed equal to 4.69×106, what is the radius of its circular orbit? (me = 9.11×10-31kg)
  •  7.63×104
  •  7.63×10-5
  •  7.63×106
  •  0.73×10-6
  •  7.3×10-6
  1.  Calculate the maximum kinetic energy of protons in a cyclotron of radius 0.50 m in a magnetic field of 0.35 T.
  •  1.46 KeV
  •  1.46 meV
  •  1.46 MeV
  •  0.146 eV
  •  1.46 eV
  1.  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
  •  0.442 mV
  •  4.42 V
  •  44.2 V
  •  4.42 mV
  1.  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
  •  150
  •  15
  •  1.5
  •  0.15
  1.  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.
  •  9.43T
  •  9.43T
  •  0.943 T
  •  9.43 T
  •  943 T
  1.  Assume that a motor having coils with a resistance of 10 Ohm 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.
  •  10 A
  •  12 A
  •  1 A
  •  1.2 A
  •  120 A
  1.  Assume that a motor having coils with a resistance of 10 Ohm 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.
  •  3 A
  •  4 A
  •  5 A
  •  6 A
  •  7 A
  1.  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
  •  0.181 H
  •  1.81 mH
  •  1.81 H
  •  181 H
  1.  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.
  •  0.905 mV
  •  9.05 mV
  •  0.905 V
  •  9.05 V
  •  905 V
  1.  Calculate the time constant of RL circuit consisting of a 30 mH inductor in series with 6 Ω resistor and 12 V battery.
  •  180 ms
  •  60 ms
  •  5 ms
  •  2 ms
  •  30 ms




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