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AP Physics 2 Medium practice

15 questions

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Medium practice

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Question 1

A diffraction grating with $500 lines/mm$ is illuminated with light of wavelength $λ = 600 nm$ . At what angle does the first-order ( $m = 1$ ) maximum appear?

θ \approx 17.5°

θ \approx 30°

θ \approx 8.6°

θ \approx 35.1°

Question 2

Which of the following processes is impossible according to the second law of thermodynamics?

A.A heat engine converts 40% of absorbed heat into work and rejects the rest.B.Heat flows from a hot object to a cold object when they are in thermal contact.C.A refrigerator removes heat from a cold interior and expels heat to a warm room, using electrical work.D.A cyclic heat engine converts all absorbed heat into work with no heat rejected to a cold reservoir.

Question 3

An electron (charge $- e$ ) is released from rest at a point where the electric potential is $V = - 50 V$ and moves to a point where $V = + 50 V$ . By how much does the electron's kinetic energy increase?

Δ K E = - 1.6 \times 1 0^{- 17} J

(electron loses energy)B.

Δ K E = + 8.0 \times 1 0^{- 18} J

Δ K E = + 1.6 \times 1 0^{- 17} J

Δ K E = 0

(electron starts from rest so gains no energy)

Question 4

A charge $q = + 2 μ C$ is moved from point A to point B in an electric field. The potential at A is $V_{A} = 100 V$ and at B is $V_{B} = 40 V$ . What is the work done by the electric field on the charge?

W = + 1.2 \times 1 0^{- 4} J

W = - 1.2 \times 1 0^{- 4} J

W = + 2.8 \times 1 0^{- 4} J

W = + 8.0 \times 1 0^{- 5} J

Question 5

A circuit has a $9 V$ battery with internal resistance $r = 1 Ω$ connected to an external resistance $R = 8 Ω$ . What is the terminal voltage of the battery?

V_{terminal} = 9 V

V_{terminal} = 8 V

V_{terminal} = 1 V

V_{terminal} = 9.1 V

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Question 6

Three point charges are placed along a line: $+ Q$ at $x = 0$ , $- Q$ at $x = d$ , and $+ Q$ at $x = 2 d$ . At the point $x = d$ (the location of the $- Q$ charge), the net electric field due to the other two charges points in which direction?

A.In the

+ x

directionB.In the

- x

directionC.The net electric field at

x = d

from the two

+ Q

charges is zero.D.Perpendicular to the line (in the

y

-direction)

Question 7

A circular loop of radius $r = 0.1 m$ has resistance $R = 5 Ω$ . It is placed in a magnetic field perpendicular to the loop. The field changes at a rate of $\frac{d B}{d t} = 200 T/s$ . What is the induced current in the loop?

I \approx 0.04 A

I \approx 1.26 A

I \approx 6.28 A

I \approx 0.4 A

Question 8

A convex (diverging) mirror always produces what type of image for a real object?

A.Real, inverted, diminishedB.Real, upright, magnifiedC.Virtual, inverted, diminishedD.Virtual, upright, diminished

Question 9

Two long parallel wires carry equal currents $I$ in opposite directions and are separated by distance $d$ . What is the nature of the magnetic force between them?

A.Attractive, because opposite currents create fields that reinforce between the wires.B.Repulsive, because the magnetic fields between the wires push outward.C.Attractive, same as for parallel currents in the same direction.D.There is no magnetic force because the fields cancel between the wires.

Question 10

A $60 W$ lightbulb is designed to operate at $120 V$ . What is its operating resistance?

R = 0.5 Ω

R = 240 Ω

R = 2 Ω

R = 7200 Ω

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Question 11

One mole of an ideal monatomic gas undergoes an isobaric expansion from volume $V_{1}$ to $2 V_{1}$ at pressure $P$ . Which expression correctly gives the heat $Q$ added to the gas? (Use $R$ for the ideal gas constant.)

Q = P V_{1}

Q = \frac{3}{2} P V_{1}

Q = \frac{5}{2} P V_{1}

Q = 2 P V_{1}

Question 12

A $6 Ω$ resistor and a $3 Ω$ resistor are connected in parallel. This parallel combination is in series with a $2 Ω$ resistor, and the whole circuit is powered by a $12 V$ battery. What is the current through the $6 Ω$ resistor?

I_{6} = 3 A

I_{6} = 1 A

I_{6} = 2 A

I_{6} = 4 A

Question 13

According to special relativity, a muon traveling at $v = 0.99 c$ relative to Earth has a lifetime measured in Earth's frame that is longer than its proper lifetime. This phenomenon is called:

A.Length contractionB.Time dilationC.The twin paradoxD.Mass-energy equivalence

Question 14

A rectangular conducting loop is pulled out of a uniform magnetic field $B$ pointing into the page at constant velocity $v$ . The loop has width $L$ (the side perpendicular to $v$ ). Which expression gives the magnitude of the induced EMF while the loop is being pulled out?

E = B L^{2} v

E = B Lv

E = B v / L

E = B^{2} Lv

Question 15

An ideal gas expands adiabatically and does $W = 500 J$ of work on its surroundings. What is the change in internal energy of the gas?

Δ U = + 500 J

Δ U = 0

Δ U = - 500 J

D.Cannot be determined without knowing the pressure.

AP Physics 2 Medium practice — Free with Answer Explanations | Test Practice Hub