Exam 2 – PHYS 112
1:00 – 1:50 PM
March 13, 2026 Answer key
Test Instruction
• Calculator is allowed.
• One 3×5 inch index card is allowed with anything written on both sides.
• Only the Akindi (bubble) sheet will be collected and graded. Make sure you
bubble your answers on the Akindi sheet correctly.
• You can write on this test, but it will not be graded.
• Do NOT open this test until you are told so.
• No books, notes, headphones, earbuds, electronic devices, caps with bills, or
sunglasses.
• Standards for academic integrity will be enforced.
• All incidents of alleged academic misconduct will be reported.
Stay calm and do your best!
1
, Q1. The figure at right shows the current-versus-voltage graph for a
resistor. What is the resistance of this resistor?
A. 0.2 W
B. 0.5 W
C. 1.0 W
D. 1.5 W
E. 2.0 W
O
E F. 2.5 W
G. 5.0 W
H. None of the above
Q2. The four wires below are all made of the same material; the length and radius of each wire are noted.
Which of them has the least resistance?
A. R1
B. R2
0
B C. R3
D. R4
E. Not enough information
(Q3-Q4). A light bulb is rated as 18 V, 12 W.
Q3. What is its resistance?
A. 3.0 Ω
B. 1.5 Ω
C. 8.0 Ω
D. 0.67 Ω
0
E E. 27 Ω
F. 216 Ω
G. None of the above
Q4. If the bulb is connected to a 36 V battery, what is the electric power dissipated?
A. 12 W
B. 6.0 W
C. 3.0 W
D. 24 W
E. 36 W
0
F F. 48 W
G. 216 W
H. None of the above
2
1:00 – 1:50 PM
March 13, 2026 Answer key
Test Instruction
• Calculator is allowed.
• One 3×5 inch index card is allowed with anything written on both sides.
• Only the Akindi (bubble) sheet will be collected and graded. Make sure you
bubble your answers on the Akindi sheet correctly.
• You can write on this test, but it will not be graded.
• Do NOT open this test until you are told so.
• No books, notes, headphones, earbuds, electronic devices, caps with bills, or
sunglasses.
• Standards for academic integrity will be enforced.
• All incidents of alleged academic misconduct will be reported.
Stay calm and do your best!
1
, Q1. The figure at right shows the current-versus-voltage graph for a
resistor. What is the resistance of this resistor?
A. 0.2 W
B. 0.5 W
C. 1.0 W
D. 1.5 W
E. 2.0 W
O
E F. 2.5 W
G. 5.0 W
H. None of the above
Q2. The four wires below are all made of the same material; the length and radius of each wire are noted.
Which of them has the least resistance?
A. R1
B. R2
0
B C. R3
D. R4
E. Not enough information
(Q3-Q4). A light bulb is rated as 18 V, 12 W.
Q3. What is its resistance?
A. 3.0 Ω
B. 1.5 Ω
C. 8.0 Ω
D. 0.67 Ω
0
E E. 27 Ω
F. 216 Ω
G. None of the above
Q4. If the bulb is connected to a 36 V battery, what is the electric power dissipated?
A. 12 W
B. 6.0 W
C. 3.0 W
D. 24 W
E. 36 W
0
F F. 48 W
G. 216 W
H. None of the above
2
