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Question No: 1 ( Marks: 1 ) - Please choose one
The number of significant figures in 0.00150 is:
Question No: 2 ( Marks: 1 ) - Please choose one
One revolution is the same as:
► 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)
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:
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?
► 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?
There are some Numerical values in the papers which are not load properly Please Download The Complete Paper PHY101 Final Term
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