PHY101 Quiz no 2 13 July 2012 Solved By
Well Wisher and HAMID KHAN
Note: Also check by your own.
Quiz Start Time: 08:46 PM
Time Left 88
sec(s)
Question # 1 of 10 ( Start time: 08:46:07 PM ) Total Marks: 1
During a slow adiabatic expansion of a gas:
Select correct option:
The pressure remains constant
Energy is added as heat
Work is done on the gas
No energy enters or leaves as heat
Question # 2 of 10 ( Start time: 08:46:58 PM ) Total Marks: 1
The half-life of a radioactive substance is:
Select correct option:
half the time it takes for the entire substance to decay
usually about 50 years
the time for radium to change into lead
the time for half the substance to decay
Quiz Start Time: 08:46 PM
Time Left 86
sec(s)
Question # 3 of 10 ( Start time: 08:48:10 PM ) Total Marks: 1
According to the special theory of relativity:
Select correct option:
All forms of energy have mass-like properties
Moving particles lose mass
Momentum is not conserved in high speed collisions
A rod moving rapidly side ways is shorter along its length
Question # 4 of 10 ( Start time: 08:49:39 PM ) Total Marks: 1
In Compton scattering from stationary particles the maximum change in wavelength can be made Smaller by using:
Select correct option:
Higher frequency radiation
Lower frequency radiation
More massive particles
Less massive particles
Quiz Start Time: 08:46 PM
Time Left 83
sec(s)
Question # 5 of 10 ( Start time: 08:50:43 PM ) Total Marks: 1
The Pauli exclusion principle is obeyed by:
Select correct option:
all charged particles
all particles
all particles with spin quantum numbers of 1/2
all particles with spin quantum numbers of 1
Quiz Start Time: 08:46 PM
Time Left 72
sec(s)
Question # 6 of 10 ( Start time: 08:51:54 PM ) Total Marks: 1
The units of the Planck constant h are those of:
Select correct option:
Energy
Angular momentum
Momentum
Frequency
Quiz Start Time: 08:46 PM
Time Left 88
sec(s)
Question # 7 of 10 ( Start time: 08:53:17 PM ) Total Marks: 1
In a photoelectric e?ect experiment the stopping potential is:
Select correct option:
The energy required to remove an electron from the sample
The kinetic energy of the most energetic electron ejected
The potential energy of the most energetic electron ejected
The electric potential that causes the electron current to vanish
Quiz Start Time: 08:46 PM
Time Left 88
sec(s)
Question # 8 of 10 ( Start time: 08:54:47 PM ) Total Marks: 1
When you stand in front of a plane mirror, your image is:
Select correct option:
real, erect, and smaller than you
virtual, erect, and smaller than you
virtual, erect, and the same size as you
real, inverted, and the same size as you
Quiz Start Time: 08:46 PM
Time Left 88
sec(s)
Question # 9 of 10 ( Start time: 08:55:38 PM ) Total Marks: 1
Evidence that molecules of a gas are in constant motion is:
Select correct option:
Winds exert pressure
Warm air rises
Gases area easily compressed
Hamid: i thnk 1
8:55 PM
Question # 10 of 10 ( Start time: 08:56:36 PM ) Total Marks: 1
In an adiabatic process:
Select correct option:
The energy absorbed as heat equals the work done by the system on its environment
The energy absorbed as heat equals the work done by the environment on the system
The absorbed as heat equals the change in internal energy
The work done by the environment on the system equals the change in internal energy
Quiz Start Time: 09:00 PM
Time Left 87
sec(s)
Question # 1 of 10 ( Start time: 09:00:55 PM ) Total Marks: 1
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 ______.
Select correct option:
3.00 x10^8 m/s
1.94 x 10^8 m/s
4.29 x 10^8 km/h SOLVE BY YOUR OWN.
3.00 x 10^8 km/h
9:00 PM
Quiz Start Time: 09:00 PM
Time Left 85
sec(s)
Question # 2 of 10 ( Start time: 09:02:26 PM ) Total Marks: 1
In a photoelectric effect experiment at a frequency above cut off, the stopping potential is proportional to:
Select correct option:
the energy of the least energetic electron before it is ejected
the energy of the least energetic electron after it is ejected
the energy of the most energetic electron before it is ejected
the energy of the most energetic electron after it is ejected
Quiz Start Time: 09:00 PM
Time Left 89
sec(s)
Question # 3 of 10 ( Start time: 09:03:51 PM ) Total Marks: 1
The two metallic strips that constitute some thermostats must di?er in:
Select correct option:
Thickness Length
Mass
Rate at which they conduct heat
Coe?cient of linear expansion
Quiz Start Time: 09:00 PM
Time Left 88
sec(s)
Question # 4 of 10 ( Start time: 09:05:20 PM ) Total Marks: 1
A basic postulate of Einstein's theory of relativity is:
Select correct option:
Moving clocks run more slowly than when they are at rest
Moving rods are shorter than when they are at rest
Light has both wave and particle properties
The laws of physics must be the same for observers moving with uniform velocity relative to each other
Quiz Start Time: 09:00 PM
Time Left 87
sec(s)
Question # 5 of 10 ( Start time: 09:05:53 PM ) Total Marks: 1
The isotopes of an element:
Select correct option:
Cannot be separated at all
Occur well separated in nature
Have similar chemical behavior
Cannot be separated by physical methods
9
Quiz Start Time: 09:00 PM
Time Left 84
sec(s)
Question # 6 of 10 ( Start time: 09:06:53 PM ) Total Marks: 1
The Light from any ordinary source (such as a flame) is usually:
Select correct option:
Plane polarized
Circularly polarized
Monochromatic
Un-polarized
9:06 PM
Quiz Start Time: 09:00 PM
Time Left 85
sec(s)
Question # 7 of 10 ( Start time: 09:08:18 PM ) Total Marks: 1
In a photoelectric e?ect experiment at a frequency above cut o?, the number of electrons ejected is proportional to:
Select correct option:
Their kinetic energy
Their potential energy
The work function
The number of photons that hit the sample
Quiz Start Time: 09:00 PM
Time Left 85
sec(s)
Question # 8 of 10 ( Start time: 09:09:38 PM ) Total Marks: 1
Of the following, Compton scattering from electrons is most easily observed for:
Select correct option:
Micro waves
Infrared light
Visible light
X rays
Quiz Start Time: 09:00 PM
Time Left 87
sec(s)
Question # 9 of 10 ( Start time: 09:11:05 PM ) Total Marks: 1
Possible units for the coe?cient of volume expansion are:
Select correct option:
mm3/C?
(C?)3
1/(C?)3
1/C?
1
1
?
Quiz Start Time: 09:00 PM
Time Left 84
sec(s)
Question # 10 of 10 ( Start time: 09:12:21 PM ) Total Marks: 1
The allowed energy states of atoms or molecules can be described by a set of ………..
Select correct option:
quantum numbers
quantum mechanics law
hypothesis given by Bohr
none of these
Quiz Start Time: 09:17 PM
Time Left 88
sec(s)
Question # 1 of 10 ( Start time: 09:17:06 PM ) Total Marks: 1
The theoretical upper limit for the frequency of electromagnetic waves is:
Select correct option:
just slightly greater than that of red light
just slightly less than that of blue light
the greatest x-ray frequency
there is no upper limit
Quiz Start Time: 09:17 PM
Time Left 82
sec(s)
Question # 2 of 10 ( Start time: 09:18:34 PM ) Total Marks: 1
Following are the ways by which light can interact with matter, EXCEPT:
Select correct option:
Emission
Interference
Absorption
Transmission
Quiz Start Time: 09:17 PM
Time Left 87
sec(s)
Question # 3 of 10 ( Start time: 09:19:47 PM ) Total Marks: 1
Evidence that a gas consists mostly of empty space is the fact that:
Select correct option:
The density of a gas becomes much greater when it is liquefied
Gases exert pressure on the walls of their containers
Gases are transparent
Heating a gas increases the molecular motion
9:19 PM
Quiz Start Time: 09:17 PM
Time Left 89
sec(s)
Question # 4 of 10 ( Start time: 09:20:47 PM ) Total Marks: 1
An erect object is in front of a convex mirror a distance greater than the focal length. The image is:
Select correct option:
Real, inverted, and smaller than the object
Virtual, inverted, and larger than the object
Real, inverted, and larger than the object
Virtual, erect, and smaller than the object
Quiz Start Time: 09:17 PM
Time Left 84
sec(s)
Question # 5 of 10 ( Start time: 09:22:07 PM ) Total Marks: 1
The wavelength of red light is 700 nm. Its frequency is ____.
Select correct option:
4.29 * 10^14 Hertz
4.29 * 10^13 Hertz
4.29 * 10^15 Hertz
4.29 * 10^12 Hertz
40 secs
me: wait
9
Quiz Start Time: 09:17 PM
Time Left 86
sec(s)
Question # 6 of 10 ( Start time: 09:23:38 PM ) Total Marks: 1
Probability values are assigned on a scale of
Select correct option:
0 to 1.
-1 to 0.
-1 to 1
1 to infinity
oye 3 e lagya tha hahahaa
Quiz Start Time: 09:17 PM
Time Left 88
sec(s)
Question # 8 of 10 ( Start time: 09:24:39 PM ) Total Marks: 1
When two gases separate by a diathermal wall are in thermal equilibrium with each other:
Select correct option:
Only their pressures must be the same
Only their volumes must be the same
They must have the same number of particles
Only their temperatures must be the same
Quiz Start Time: 09:17 PM
Time Left 88
sec(s)
Question # 10 of 10 ( Start time: 09:27:13 PM ) Total Marks: 1
Room temperature is about 20 degrees on the:
Select correct option:
Kelvin scale
Celsius scale
Fahrenheit scale
Absolute scale
...:::Group Rules:::...
Groups "vu pink" group.
