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Thread: PHY101 Physics Spring 2009 Final Term Paper

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    28 PHY101 Physics Spring 2009 Final Term Paper

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    FINALTERM EXAMINATION
    Spring 2009
    PHY101- Physics

    Question No: 1 ( Marks: 1 ) - Please choose one
    The number of significant figures in 0.00150 is:



    ► 5
    ► 4
    ► 3
    ► 2

    Question No: 2 ( Marks: 1 ) - Please choose one
    One revolution is the same as:
    2π rad


    ► 1 rad
    ► 57 rad

    ► π/2 rad
    ► π rad
    ► 2π rad

    Question No: 3 ( Marks: 1 ) - Please choose one
    For a body to be in equilibrium under the combined action of several forces:


    ► all the forces must be applied at the same point
    all the forces must be applied at the same point
    ► all of the forces form pairs of equal and opposite forces
    ► any two of these forces must be balanced by a third force
    ► the sum of the torques about any point must equal zero


    Question No: 4 ( Marks: 1 ) - Please choose one
    A bucket of water is pushed from left to right with increasing speed across a horizontal surface.
    Consider the pressure at two points at the same level in the water.


    ► It is the same
    ► It is higher at the point on the left
    ► It is higher at the point on the right
    ► At first it is higher at the point on the left but as the bucket speeds up it is lower there


    Question No: 5 ( Marks: 1 ) - Please choose one
    An organ pipe with both ends open is 0.85m long. Assuming that the speed of sound is 340m/s, the frequency of the third harmonic of this pipe is:

    ► A. 200 Hz
    ► B. 300 Hz
    ► C. 400 Hz
    ► D. 600 Hz


    Question No: 6 ( Marks: 1 ) - Please choose one
    Capacitors C1 and C2 are connected in series. The equivalent capacitance is given by

    ► C1C2/(C1 + C2)
    ► (C1 + C2)/C1C2
    ► 1/(C1 + C2)
    ► C1/C2


    Question No: 7 ( Marks: 1 ) - Please choose one
    If the potential difference across a resistor is doubled:



    ► only the current is doubled
    ► only the current is halved
    ► only the resistance is doubled
    ► only the resistance is halved

    Question No: 8 ( Marks: 1 ) - Please choose one
    By using only two resistors, R1 and R2, a student is able to obtain resistances of 3 Ω, 4Ω, 12Ω, and 16 Ω. The values of R1 and R2 (in ohms) are:



    ► 3, 4
    ► 2, 12
    ► 3, 16
    ► 4, 12

    Question No: 9 ( Marks: 1 ) - Please choose one
    Faraday's law states that an induced emf is proportional to:



    ► the rate of change of the electric field
    ► the rate of change of the magnetic flux
    ► the rate of change of the electric flux
    ► the rate of change of the magnetic field

    Question No: 10 ( Marks: 1 ) - Please choose one
    A generator supplies 100V to the primary coil of a transformer. The primary has 50 turns and the secondary has 500 turns. The secondary voltage is:



    ► 1000V
    ► 500V
    ► 250V
    ► 100V

    Question No: 11 ( Marks: 1 ) - Please choose one
    The wavelength of red light is 700 nm. Its frequency is ____________________.


    ► 4.30 * 104 Hertz
    ► 4.30 * 103 Hertz
    ► 4.30 * 105 Hertz
    ► 4.30 * 102 Hertz

    Question No: 12 ( Marks: 1 ) - Please choose one
    In some movies, you sometimes see an actor looking in a mirror and you can see his face in the mirror. During the filming of this scene, what does the actor see in the mirror?


    ► His face
    ► Your face
    ► The movie camera
    ► The director's face


    Question No: 13 ( Marks: 1 ) - Please choose one
    A laser in a compact disc player generates light that has a wavelength of 780 nm in air. The light then enters into the plastic of a CD. If the index of refraction of plastic is 1.55, the speed of this light once enter the plastic is ________.


    ► 3.00 * 108 m/s
    ► 1.94 * 108 m/s
    ► 4.29 * 108 km/h
    ► 3.00 * 108 km/h


    Question No: 14 ( Marks: 1 ) - Please choose one
    Which of the following electromagnetic radiations has photons with the greatest energy?


    ► blue light
    ► yellow light
    ► x rays
    ► radio waves

    Question No: 15 ( Marks: 1 ) - Please choose one
    A virtual image is one:




    ► toward which light rays converge but do not pass through
    ► from which light rays diverge as they pass through
    ► toward which light rays converge and pass through
    ► from which light rays diverge but do not pass through

    Question No: 16 ( Marks: 1 ) - Please choose one
    What is the unit of magnification factor?



    ► meter.Kelvin
    ► radian.Kelvin
    ► degree.Kelvin
    ► no units

    Question No: 17 ( Marks: 1 ) - Please choose one
    During an adiabatic process an object does 100 J of work and its temperature decreases by 5K. During another process it does 25 J of work and its temperature decreases by 5 K. Its heat capacity for the second process is.





    ► 20 J/K
    ► 100 J/K
    ► 15 J/K
    ► 5 J/K

    Question No: 18 ( Marks: 1 ) - Please choose one
    An ideal gas expands into a vacuum in a rigid vessel. As a result there is:


    ► a change in entropy
    ► a decrease of internal energy
    ► an increase of pressure
    ► a change in temperature

    Question No: 19 ( Marks: 1 ) - Please choose one
    The Stern-Gerlach experiment makes use of:

    ► a strong uniform magnetic field
    ► a strong non-uniform magnetic field
    ► a strong uniform electric field
    ► a strong non-uniform electric field

    Question No: 20 ( Marks: 1 ) - Please choose one
    A large collection of nuclei are undergoing alpha decay. The rate of decay at any instant is proportional to:

    ► the number of undecayed nuclei present at that instant
    ► the time since the decays started
    ► the time remaining before all have decayed
    ► the half-life of the decay

    Question No: 21 ( Marks: 1 )
    Which weighs more, a liter of ice or a liter of water?


    Question No: 22 ( Marks: 1 )
    Will the current in a light bulb connected to a 220-V source be greater or less than when the same bulb is connected to 110-V source?



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    Question No: 23 ( Marks: 1 )
    How is the wavelength of light related to its frequency?



    Question No: 24 ( Marks: 1 )
    We don't notice the de Broglie wavelength for a pitched baseball. Is this because
    the wavelength is very large or because it is very small?


    Question No: 25 ( Marks: 2 )
    Does every magnet necessarily have a north and south pole? Explain


    Question No: 26 ( Marks: 2 )
    In a cool room, a metal or marble table top feels much colder to the touch than does a wood surface even though they are at the same temperature. Why?


    Question No: 27 ( Marks: 3 )
    If a water wave oscillates up and down three times each second and the distance between wave crests is 2 m, what is its frequency? What is its wavelength? What is its wave speed?

    Question No: 28 ( Marks: 3 )
    A transformer has N1 = 350 turns and N2 = 2 000 turns. If the input voltage is 
    v(t) = (170 V) cos  t, what rms voltage is developed across the secondary coil?



    Question No: 29 ( Marks: 3 )
    Why do astronomers looking at distant galaxies talk about looking backward in time?


    Question No: 30 ( Marks: 3 )
    Some distant astronomical objects, called quasars, are receding from us at half the speed of light (or greater). What is the speed of the light we receive from these quasars?




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