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FINALTERM EXAMINATION
Spring 2009
PHY101- Physics (Session - 2)
Question No: 1 ( Marks: 1 ) - Please choose one

► 5
► 4
► 3
► 2
Question No: 2 ( Marks: 1 ) - Please choose one

2Ï€ rad
► 1 rad
► 57 rad
► Ï€/2 rad
► Ï€ rad
► 2Ï€ rad
Question No: 3 ( Marks: 1 ) - Please choose one

► 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

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

► A. 200 Hz
► B. 300 Hz
► C. 400 Hz
► D. 600 Hz
Question No: 6 ( Marks: 1 ) - Please choose one

► C1C2/(C1 + C2)
► (C1 + C2)/C1C2
► 1/(C1 + C2)
► C1/C2
Question No: 7 ( Marks: 1 ) - Please choose one

► 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

► 3, 4
► 2, 12
► 3, 16
► 4, 12
Question No: 9 ( Marks: 1 ) - Please choose one

► 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

► 1000V
► 500V
► 250V
► 100V
Question No: 11 ( Marks: 1 ) - Please choose one

► 4.30 * 104 Hertz
► 4.30 * 103 Hertz
► 4.30 * 105 Hertz
► 4.30 * 102 Hertz
Question No: 12 ( Marks: 1 ) - Please choose one

► His face
► Your face
► The movie camera
► The director's face
Question No: 13 ( Marks: 1 ) - Please choose one

► 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

► blue light
► yellow light
► x rays
► radio waves
Question No: 15 ( Marks: 1 ) - Please choose 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

► meter.Kelvin
► radian.Kelvin
► degree.Kelvin
► no units
Question No: 17 ( Marks: 1 ) - Please choose one

► 20 J/K
► 100 J/K
► 15 J/K
► 5 J/K
Question No: 18 ( Marks: 1 ) - Please choose one

► 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

► 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

► 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 )

Question No: 22 ( Marks: 1 )

Question No: 23 ( Marks: 1 )

Question No: 24 ( Marks: 1 )

the wavelength is very large or because it is very small?
Question No: 25 ( Marks: 2 )

Question No: 26 ( Marks: 2 )

Question No: 27 ( Marks: 3 )

Question No: 28 ( Marks: 3 )

v(t) = (170 V) cos w t, what rms voltage is developed across the secondary coil?
Question No: 29 ( Marks: 3 )

Question No: 30 ( Marks: 3 )

Question No: 31 ( Marks: 5 )


Question No: 32 ( Marks: 5 )

Question No: 33 ( Marks: 5 )

2. Do all current-carrying conductors emit electromagnetic waves? Explain
2. Yes all current carrying conductors emit electromagnetic waves, and these are at the right angle of the current passes thorough as right hand rule of Fleming’s explains it.
Question No: 34 ( Marks: 5 )

Question No: 35 ( Marks: 10 )

b) On a humid day, water vapor condenses on a cold surface. During condensation, the entropy of the water(a) in-creases, (b) remains constant, (c) decreases, (d) may decreases or remain unchanged. Give its reason.
Question No: 1 ( Marks: 1 ) - Please choose one

► 6.0kg · m2/s
► 6.0kg · m2/s
► 9.0kg · m2/s
► 11 kg · m2/s
► 14 kg · m2/s
Question No: 2 ( Marks: 1 ) - Please choose one

► rotational equilibrium
► linear acceleration
► rotational equilibrium
► angular acceleration
► rotational inertia
Question No: 3 ( Marks: 1 ) - Please choose one

► 2.0 rad/s
► 12.6 rad/s
► 1.57 rad/s
► 2.0 rad/s
► 6.3 rad/s
Question No: 4 ( Marks: 1 ) - Please choose one

► displacement
► amplitude
► frequency
► velocity
► displacement
Question No: 5 ( Marks: 1 ) - Please choose one

► it has a high density
► it is a metal
► it has a high boiling point
► it expands little with temperature
► it has a high density
Question No: 6 ( Marks: 1 ) - Please choose one

► J/m
► J/m
► J/(C·m)
► J/C
► J·C
Question No: 7 ( Marks: 1 ) - Please choose one

► J/V
► J/V
► V/J
► C/V
► V/C
Question No: 8 ( Marks: 1 ) - Please choose one

► 100 μF
► 1 F
► 1mF
► 1 μF
► 100 μF
Question No: 9 ( Marks: 1 ) - Please choose one

► 4.30 * 105Hertz
► 4.30 * 104 Hertz
► 4.30 * 103 Hertz
► 4.30 * 105Hertz
► 4.30 * 102 Hertz
Question No: 10 ( Marks: 1 ) - Please choose one

► The electromagnetic radiation from a burning candle is unpolarized.
► Electromagnetic waves satisfy the Maswell's Equation.
► Electromagnetic waves can not travel through space.
► The receptions of electromagnetic waves require an antenna.
► The electromagnetic radiation from a burning candle is unpolarized.
Question No: 11 ( Marks: 1 ) - Please choose one

► Electromagnetic and transverse both
► Longitudinal waves
► Transverse waves
► Electromagnetic and transverse both
► Electromagnetic and longitudinal both
Question No: 12 ( Marks: 1 ) - Please choose one

► 2.90 * 10-3m
► 2.90 * 10-3 Hertz
► 2.90 * 10-3 s
► 2.90 * 10-3 kg
► 2.90 * 10-3m
Question No: 13 ( Marks: 1 ) - Please choose one

► light is a wave phenomenon
► the speed of light is very large
► light is a transverse wave
► light is a wave phenomenon
► light is electromagnetic in character
Question No: 14 ( Marks: 1 ) - Please choose one

► -40
► -40
► 0
► 273
► 574
Question No: 15 ( Marks: 1 ) - Please choose one

► moving clocks run fast
► moving clocks run fast
► energy is not conserved in high speed collisions
► the speed of light must be measured relative to the ether
► none of the above are true
Question No: 16 ( Marks: 1 ) - Please choose one

► lower frequency and a shorter wavelength than before
► higher frequency and a longer wavelength than before
► lower frequency and a shorter wavelength than before
► higher frequency and a shorter wavelength than before
► lower frequency and a longer wavelength than before
Question No: 17 ( Marks: 1 ) - Please choose one

► 38c
► 20c
► 38c
► 45c
► 51c
Question No: 18 ( Marks: 1 ) - Please choose one

► Energy
► Energy
► Orbital angular momentum
► Spin angular momentum
► Magnetic moment
Question No: 19 ( Marks: 1 ) - Please choose one

► Energy
► Magnitude of the orbital angular momentum
► Energy
► z component of the spin angular momentum
► z component of the orbital angular momentum
Question No: 20 ( Marks: 1 ) - Please choose one

► Remain the same
► Decrease
► Increase
► Remain the same
► None of these
Question No: 21 ( Marks: 3 )

Forces in x direction = 0
Forces in Y = F1 + F2 - W
Given:
L = 3.00 m F1 = 60 N
W = 160 N F2 = ? and x2 = ?
Sum of forces and torques = 0
Sum Force = F1 + F2 - W = 0
60N + F2 - 160 N = 0
F2 = 100 N
My pivot point is at F2.
Sum of torques = 0
Torque F1 = F1(L - x2)
Torque F2 = 0 b/c at pivot point
Torque W = W(L/2 - x2)
F1L - F1x2 + (WL)/2 - Wx2 = 0
(60)(3) - 60x2 + (160 * 3)/2 - 160x2 = 0
180-60x2 + 240-160x2 = 0
420-220x2 = 0
x2 = 1.9m
Forces in Y = F1 + F2 - W
Given:
L = 3.00 m F1 = 60 N
W = 160 N F2 = ? and x2 = ?
Sum of forces and torques = 0
Sum Force = F1 + F2 - W = 0
60N + F2 - 160 N = 0
F2 = 100 N
My pivot point is at F2.
Sum of torques = 0
Torque F1 = F1(L - x2)
Torque F2 = 0 b/c at pivot point
Torque W = W(L/2 - x2)
F1L - F1x2 + (WL)/2 - Wx2 = 0
(60)(3) - 60x2 + (160 * 3)/2 - 160x2 = 0
180-60x2 + 240-160x2 = 0
420-220x2 = 0
x2 = 1.9m
Question No: 22 ( Marks: 3 )

Question No: 23 ( Marks: 3 )

Question No: 24 ( Marks: 3 )

Question No: 25 ( Marks: 3 )

Wave functions contain all the measurable information about the particles
Wave functions are continuous.
They allow energy calculations via schrodinger equation.
They establish the probability distribution in three dimensions.
They permit calculation of most probable values of given variables.
Question No: 26 ( Marks: 5 )

2as = vf2 – vi2
2a(35.4) = (7.10)2 – (0)2
2a(35.4) = 50.41
A = .71 m/s2
Question No: 27 ( Marks: 5 )

E=(Bf-Bi)*A/t=(2.5-0.5)*8*10-4/1=1.6*10-3 V
I=E/R=1.23 mA
I=E/R=1.23 mA
Question No: 28 ( Marks: 5 )

Question No: 29 ( Marks: 5 )

Ans:
Lord Rutherford discovered the nucleus. He carried out his famous experiment that showed the existence of a small but very heavy core of the atom. He arranged for a beam of alpha particles to strike gold atoms in a thin foil of gold. If the positive and negative charges in the atom were randomly distributed, all ' would go through without any deflection. But a lot of backscattering was seen, and some alphas were even deflected back in the direction of the incident beam. This was possible only if they were colliding with a very heavy object inside the atom.
Question No: 30 ( Marks: 5 )

Question No: 31 ( Marks: 10 )

(b) Which law is obeyed by Sun and other stars, briefly explain it.
(a) When can you expect a body to emit blackbody radiation?
Ans:
Waves are emitted when charges accelerate. Blackbody radiation occurs for exactly this reason as well. If a body is heated up, the electrons, atoms, and molecules which it contains undergo violent random motion. Light may emit by electrons in one atom and absorbed in another. Even an empty box will be filled with blackbody radiation because the sides of the box are made up of material that has charged constituents that radiate energy when they undergo acceleration during their random motion. A blackbody is both an ideal absorber and an ideal radiator. At high temperature, a body emits radiation of shorter wavelength. Temperature is inversely proportional to wavelength.
(b) Which law is obeyed by Sun and other stars, briefly explain it.
Ans:
The Sun and other stars obey Wien's Law since the gases they are composed of emit radiation that is in equilibrium with the other materials. Wien's law allows astronomers to determine the temperature of a star because the wavelength at which a star is brightest is related to its temperature.
Question # 1 of 10 ( Start time: 03:57:12 PM ) Total Marks: 1
The speed of a sound wave is determined by:
Select correct option:
its amplitude
its intensity
the transmitting medium
number of harmonics present
Question # 2 of 10 ( Start time: 03:58:13 PM ) Total Marks: 1
Take the speed of sound to be 340m/s. A thunder clap is heard about 3 s after the lightning is seen. The source of both light and sound is:
Select correct option:
moving overhead faster than the speed of sound
emitting a much higher frequency than is heard
emitting a much lower frequency than is heard
about 1000m away
Question # 3 of 10 ( Start time: 03:59:37 PM ) Total Marks: 1
If the speed of sound is 340m/s a plane flying at 400m/s creates a conical shock wave with an apex half angle of:
Select correct option:
0 (no shock wave)
32?
40?
58?
Question # 4 of 10 ( Start time: 04:01:00 PM ) Total Marks: 1
Two sound waves are traveling through a container of unknown gas. Wave A has a wavelength of 1.2 m. Wave B has a wavelength of 3.6 m. The frequency of wave B must be __________ the frequency of wave A.
Select correct option:
One-ninth
One-third
The same as
Three times larger than
Question # 6 of 10 ( Start time: 04:03:07 PM ) Total Marks: 1
Two sound waves are traveling through a container of unknown gas. Wave A has a wavelength of 1.2 m. Wave B has a wavelength of 3.6 m. The velocity of wave B must be __________ the velocity of wave A.
Select correct option:
One-ninth
One-third
The same as
Three times larger than
Question # 7 of 10 ( Start time: 04:04:27 PM ) Total Marks: 1
The speed of a wave depends upon (i.e., is causally affected by)...
Select correct option:
The properties of the medium through which the wave travels
The wavelength of the wave.
The frequency of the wave.
Both the wavelength and the frequency of the wave.
Question # 8 of 10 ( Start time: 04:05:35 PM ) Total Marks: 1
A plane produces a sonic boom only when:
Select correct option:
it emits sound waves of very long wavelength
it emits sound waves of high frequency
it flys at high altitudes
it flys faster than the speed of sound
Question # 9 of 10 ( Start time: 04:06:18 PM ) Total Marks: 1
An object attached to one end of a spring makes 20 complete oscillations in 10 s. Its period is:
Select correct option:
2Hz
0.5 s
0.5Hz
2 s
Question # 10 of 10 ( Start time: 04:07:33 PM ) Total Marks: 1
In simple harmonic motion, the restoring force must be proportional to the:
Select correct option:
amplitude
frequency
velocity
displacement
Question # 1 of 10 ( Start time: 04:09:33 PM ) Total Marks: 1
The speed of a wave depends upon (i.e., is causally affected by)...
Select correct option:
The properties of the medium through which the wave travels
The wavelength of the wave.
The frequency of the wave.
Both the wavelength and the frequency of the wave.
Question # 2 of 10 ( Start time: 04:10:21 PM ) Total Marks: 1
A transverse wave is transporting energy from east to west. The particles of the medium will move_____.
Select correct option:
East to west only
Both eastward and westward
North to south only
Both northward and southward
Question # 3 of 10 ( Start time: 04:11:46 PM ) Total Marks: 1
A force of 5000N is applied outwardly to each end of a 5.0-m long rod with a radius of 34.0 cm and a Young’s modulus of 125 × 108 N/m2. The elongation of the rod is:
Select correct option:
0.0040mm
0.14mm
0.55mm
1.42mm
Question # 4 of 10 ( Start time: 04:12:51 PM ) Total Marks: 1
Take the speed of sound to be 340m/s. A thunder clap is heard about 3 s after the lightning is seen. The source of both light and sound is:
Select correct option:
moving overhead faster than the speed of sound
emitting a much higher frequency than is heard
emitting a much lower frequency than is heard
about 1000m away
Question # 5 of 10 ( Start time: 04:13:42 PM ) Total Marks: 1
As the wavelength of a wave in a uniform medium increases, its frequency will _____.
Select correct option:
Decrease
Increase
Remain the same
None of these
Question # 6 of 10 ( Start time: 04:14:11 PM ) Total Marks: 1
Sound and light waves both
Select correct option:
have similar wavelength
obey the laws of reflection
travel as longitudinal waves
travel through vacuum
Question # 7 of 10 ( Start time: 04:15:03 PM ) Total Marks: 1
A force of 5000N is applied outwardly to each end of a 5.0-m long rod with a radius of 34.0 cm and a Young's modulus of 125 × 108 N/m2. The elongation of the rod is:
Select correct option:
0.0020mm
0.0040mm
0.14mm
0.55mm
Question # 8 of 10 ( Start time: 04:16:04 PM ) Total Marks: 1
A mosquito's buzz is often rated with a decibel rating of 40 dB. Normal conversation is often rated at 60 dB. How many times more intense is normal conversation compared to a mosquito's buzz?
Select correct option:
2
20
100
400
Question # 1 of 10 ( Start time: 07:18:05 PM ) Total Marks: 1
In simple harmonic motion, the restoring force must be proportional to the:
Select correct option:
amplitude
frequency
velocity
displacement
Question # 2 of 10 ( Start time: 07:18:35 PM ) Total Marks: 1
As the wavelength of a wave in a uniform medium increases, its speed will _____.
Select correct option:
Decrease
Increase
Remain the same
None of these
Question # 3 of 10 ( Start time: 07:19:16 PM ) Total Marks: 1
Young’s modulus is a proportionality constant that relates the force per unit area applied perpendicularly at the surface of an object to:
Select correct option:
the shear
the fractional change in volume
the fractional change in length
the pressure
Question # 4 of 10 ( Start time: 07:20:16 PM ) Total Marks: 1
Which of the following will remain unchanged when a sound wave travels in air or in water?
Select correct option:
Amplitude
Wavelength
Frequency
Speed
Question # 5 of 10 ( Start time: 07:21:36 PM ) Total Marks: 1
For a body to be in equilibrium under the combined action of several forces:
Select correct option:
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 # 6 of 10 ( Start time: 07:22:18 PM ) Total Marks: 1
Sound waves are
Select correct option:
longitudinal
transverse
partly longitudinal and partly transverse
sometimes longitudinal and sometimes transverse
Question # 7 of 10 ( Start time: 07:23:34 PM ) Total Marks: 1
Young’s modulus can be used to calculate the strain for a stress that is:
Select correct option:
just below the ultimate strength
just above the ultimate strength
well below the yield strength
well above the yield strength
Question # 8 of 10 ( Start time: 07:24:39 PM ) Total Marks: 1
Because a buoyant force acts in the opposite direction of gravity,
Select correct option:
objects submerged in water have a net force smaller than their weight.
objects submerged in water have a net force larger than their weight.
objects submerged in water have a net force equal to their weight.
objects submerged in water appear to weigh more than they do in air.
Question # 9 of 10 ( Start time: 07:26:04 PM ) Total Marks: 1
Young’s modulus can be correctly given in:
Select correct option:
N·m
N/m2
N/m
N·m/s
Question # 10 of 10 ( Start time: 07:26:45 PM ) Total Marks: 1
The frequency which is not audible to the human ear is
Select correct option:
50 Hz
500 Hz
5000 Hz
50000 Hz
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