PHYSICS MC QUESTIONS WITH 100%
CORRECT ANSWERS { GRADED A+}
*1.1.* An insulated container with a divider in the middle contains two separated
gases. Gas 1 is initially at a higher temperature than gas 2. The divider is then
removed. Which of the following observations might be made over a period of
time as the two gases mix together, and why? - ✔✔On average, the molecules of
gas 1 lose some of their kinetic energy to the molecules of gas 2 through collisions,
resulting in the two gases eventually having the same temperature.
*1.2.* A small amount of charge is placed on both an isolated conducting sphere
and an isolated insulating sphere. For both spheres, the charge is added at a small
area at the top of the sphere. After a few seconds, where on each of the spheres is
the charge that was added? - ✔✔Conducting: Spread over the Surface
Insulating: At the top
*1.4.*
XYZ
,-4q +q -q
->-------->--------->
-a 0 a
The figure above shows three objects (X, Y, and Z) that have charges -4q, +q, and
-q, respectively. The objects are held fixed on an axis at the positions shown. The
magnitude of the electrostatic force exerted by object Y on object Z is F. What is
the magnitude of the net electrostatic force exerted on object Y due to the other
two objects? - ✔✔3F
*1.5.*
*Graph with Current (A) on Y-axis & Potential Difference (V) on X-axis*
The above graph shows current as a function of potential difference for two
different filament lamps. If the two lamps are connected in parallel to a 3.0 V
battery, what is the total current supplied by the battery? - ✔✔1.6 A
*1.6.*
*Graph with P on the Y-axis & V on the X-axis*
An ideal gas is initially in state 1 at a temperature of 200K. The gas is taken
through the two reversible thermodynamic processes shown in the PV diagram
,above. The process from state 1 to state 2 is isothermal. The process from state 2 to
state 3 is isobaric. What is the temperature of the gas when it is in state 3? -
✔✔400 K
*1.7.*
*Diagram with 2 metal bars running parallel to each other with perpendicular tanks
on each end*
Two metal bars with the same length and same cross-sectional area are placed
between two tanks with temperatures of 400 K and 300 K, as shown above. The
thermal conductivity of the top bar is 200 W/m*K, and that of the bottom bar is
400 W/m*K. If the net energy transferred through the top bar in a given time
interval is Q, what is the net energy transferred through the bottom bar during the
same time interval? - ✔✔2Q
*1.8.* A ray of light in air (n=1.0) is incident on glass (n=1.5) at a small angle
*theta subscript a* to the normal. The angle of the ray to the normal in the glass is
*theta subscript g*. The speeds of light in air and the glass are *v subscript a* and
*v subscript g* respectively. How do the values of the speed of light and the angle
of the ray of light to the normal in air compare to those in the glass? - ✔✔Speed
of Light: *v sub a* > *v sub g*
, Angle to Normal: *theta sub a* > *theta sub g*
*1.9.*
*Circuit diagram*
The figure above shows a circuit containing four resistors, a battery, and two
ammeters. The current in ammeter A sub 1 is 1.0 A, and the current in ammeter A
sub 2 is 0.6 A. The two resistors labeled R are identical. What are the currents in R
sub 2 and in each of the two resistors labeled R? - ✔✔R sub 2: 0.4 A
Each R: 0.3 A
*1.10.*
*Graph with Potential Difference (V) on the Y-axis & Current (A) on the X-axis*
The graph above shows experimental data for the potential difference across a
lightbulb as a function of the current through the lightbulb. The power dissipated
by the lightbulb when the potential difference across the bulb is 12 V is most
nearly - ✔✔9.6 W
*1.11.*
*Graph with Pressure on the Y-axis & Volume on the X-axis. Within the graph lies
Point X, segments 1&2, and curve 3*
CORRECT ANSWERS { GRADED A+}
*1.1.* An insulated container with a divider in the middle contains two separated
gases. Gas 1 is initially at a higher temperature than gas 2. The divider is then
removed. Which of the following observations might be made over a period of
time as the two gases mix together, and why? - ✔✔On average, the molecules of
gas 1 lose some of their kinetic energy to the molecules of gas 2 through collisions,
resulting in the two gases eventually having the same temperature.
*1.2.* A small amount of charge is placed on both an isolated conducting sphere
and an isolated insulating sphere. For both spheres, the charge is added at a small
area at the top of the sphere. After a few seconds, where on each of the spheres is
the charge that was added? - ✔✔Conducting: Spread over the Surface
Insulating: At the top
*1.4.*
XYZ
,-4q +q -q
->-------->--------->
-a 0 a
The figure above shows three objects (X, Y, and Z) that have charges -4q, +q, and
-q, respectively. The objects are held fixed on an axis at the positions shown. The
magnitude of the electrostatic force exerted by object Y on object Z is F. What is
the magnitude of the net electrostatic force exerted on object Y due to the other
two objects? - ✔✔3F
*1.5.*
*Graph with Current (A) on Y-axis & Potential Difference (V) on X-axis*
The above graph shows current as a function of potential difference for two
different filament lamps. If the two lamps are connected in parallel to a 3.0 V
battery, what is the total current supplied by the battery? - ✔✔1.6 A
*1.6.*
*Graph with P on the Y-axis & V on the X-axis*
An ideal gas is initially in state 1 at a temperature of 200K. The gas is taken
through the two reversible thermodynamic processes shown in the PV diagram
,above. The process from state 1 to state 2 is isothermal. The process from state 2 to
state 3 is isobaric. What is the temperature of the gas when it is in state 3? -
✔✔400 K
*1.7.*
*Diagram with 2 metal bars running parallel to each other with perpendicular tanks
on each end*
Two metal bars with the same length and same cross-sectional area are placed
between two tanks with temperatures of 400 K and 300 K, as shown above. The
thermal conductivity of the top bar is 200 W/m*K, and that of the bottom bar is
400 W/m*K. If the net energy transferred through the top bar in a given time
interval is Q, what is the net energy transferred through the bottom bar during the
same time interval? - ✔✔2Q
*1.8.* A ray of light in air (n=1.0) is incident on glass (n=1.5) at a small angle
*theta subscript a* to the normal. The angle of the ray to the normal in the glass is
*theta subscript g*. The speeds of light in air and the glass are *v subscript a* and
*v subscript g* respectively. How do the values of the speed of light and the angle
of the ray of light to the normal in air compare to those in the glass? - ✔✔Speed
of Light: *v sub a* > *v sub g*
, Angle to Normal: *theta sub a* > *theta sub g*
*1.9.*
*Circuit diagram*
The figure above shows a circuit containing four resistors, a battery, and two
ammeters. The current in ammeter A sub 1 is 1.0 A, and the current in ammeter A
sub 2 is 0.6 A. The two resistors labeled R are identical. What are the currents in R
sub 2 and in each of the two resistors labeled R? - ✔✔R sub 2: 0.4 A
Each R: 0.3 A
*1.10.*
*Graph with Potential Difference (V) on the Y-axis & Current (A) on the X-axis*
The graph above shows experimental data for the potential difference across a
lightbulb as a function of the current through the lightbulb. The power dissipated
by the lightbulb when the potential difference across the bulb is 12 V is most
nearly - ✔✔9.6 W
*1.11.*
*Graph with Pressure on the Y-axis & Volume on the X-axis. Within the graph lies
Point X, segments 1&2, and curve 3*
