07-18-2010, 12:36 PM
FINALTERM EXAMINATION
Spring 2009
PHY101- Physics
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?
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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