Practice Test 2 - AP Physics 2

20 questions. Answer them in any order, then submit to see your score and every explanation.

A circuit has an ideal $18\text{ V}$ battery, then $R_1=6\,\Omega$ to junction J. From J, two branches run to junction K: branch A has $R_2=6\,\Omega$ ; branch B has $R_3=12\,\Omega$ . The branches rejoin at K and return to the battery. Which statement correctly compares the power dissipated in $R_2$ and $R_3$ ?
An ideal gas in a cylinder with a movable piston is compressed slowly from $4.0\,\text{L}$ to $2.0\,\text{L}$ while the temperature and amount of gas are held constant. Initially the pressure is $100\,\text{kPa}$ . Compared to the initial pressure, the final pressure is
A long straight wire carries current downward (− $y$ ). At a point to the east of the wire (+ $x$ ), which statement best describes the magnetic field direction there?
A 0.15 m wire segment is vertical and carries $I=5.0\ \text{A}$ upward. A uniform magnetic field of $0.30\ \text{T}$ points into the page. Which statement best describes the direction of the magnetic force on the segment?
A pin is placed closer to a converging lens than its focal length. Which statement best describes the image?
A fixed source charge $-Q$ is at the origin. Point P is at $y=0.25\,\text{m}$ on the $+y$ axis. A small negative test charge $-q$ is placed at P. Which statement best describes the direction of the electric field at P due to $-Q$ ?
A makeup mirror is a concave mirror. A face is held very close to the mirror, clearly inside the focal length. Which statement best describes the image seen?
In a reactor, a slow neutron is absorbed: $^{235}\text{U}+n\rightarrow{}^{141}\text{Ba}+{}^{92}\text{Kr}+3n+\text{energy}$ . Which statement best explains why energy is released?
A speaker on a cart emits a constant tone while the cart moves toward a student. The student walks toward the cart. Compared to if the student stood still, the student hears a frequency that is
A thin plate of Material M and a thin plate of Material N have the same mass and start at the same temperature. Each is placed in contact with the same large thermal reservoir at a higher temperature. Thermal conductivity affects the initial rate of heat transfer into the plate; specific heat affects the energy needed per degree but not the contact conductance. Which plate initially gains thermal energy faster?
A $3.0\,\mu\text{F}$ capacitor is connected across a $9.0\,\text{V}$ battery. Which conclusion is correct about the charge on one plate?
A hot object's emission peak moves from 700 nm to 500 nm as it is heated, and its intensity increases. As temperature increases, which statement about photon emission is most accurate?
A negatively charged rod is held near a neutral conductor while it is grounded; the ground is removed first, then the rod. Which statement best describes the conductor's final charge?
A rigid, sealed tank of gas is the system. Take $Q>0$ into the gas and $W>0$ done by the gas. The tank is heated so that $Q=+1200\,\text{J}$ is transferred to the gas; because the tank is rigid, the boundary does not move. Which statement correctly describes the gas's internal energy change?
A particle with charge $-2.0\mu\text{C}$ moves downward at $2.5\times10^{4}\,\text{m/s}$ in a uniform magnetic field of $0.60\,\text{T}$ directed south. Which statement best describes the magnetic force on the particle?
An uncharged capacitor $C$ is charging through a resistor $R$ from a battery. Which statement best describes the direction and change of conventional current through the resistor over time?
A fixed source charge $+Q$ is at the origin. A small negative test charge $-q$ is placed at point $P$ on the $+x$ axis to probe the field without changing the source. Which statement best describes the electric field at $P$ due to the source charge?
A negatively charged rod is brought near (without touching) a neutral conducting sphere on an insulating stand. Which statement best describes the sphere's charge?
Two insulating cups each contain $0.20$ kg of liquid at $80^\circ$ C. Both lose $400$ J to the room. Liquid R has larger specific heat than S. Which cools less?
An X-ray photon scatters from a stationary electron, and the detected wavelength is larger than the incident wavelength. Which conclusion about light is supported by this result?

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