PHY 131 EXAM 6 | QUESTIONS AND
ANSWERS | 2026 UPDATE | WITH
COMPLETE SOLUTIONS
Rub electrons from your hair with a comb and the comb becomes
a. discharged
b. negatively charged
c. positively charged - ANSWER>b
The source of all magnetism is
a. tiny pieces of iron
b. ferromagnetic materials
c. moving electric charge
d. none of these
e. tiny domains of aligned atoms - ANSWER>c
The vibrations of a longitudinal wave move in a direction
,a. along the direction of wave travel
b. that changes with speed
c. at right angles to the direction of wave travel - ANSWER>a
When two lamps are connected in parallel to a battery, the electrical resistance that the batters senses is
a. more than the resistance of either lamp
b. none of these
c. less than the resistance of either lamp - ANSWER>c
Sound travels faster in
a. air
b. a vacuum
c. water
d. sound travels about the same in all of these
e. steel - ANSWER>e
compressions and rarefactions are characteristic of
, a. neither of these
b. transverse wave
c. both longitudinal and transverse waves
d. longitudinal waves - ANSWER>d
If we think of the Earth as a magnet, its magnetic north pole is nearest
a. Australia
b. both of these
c. the Hudson Bay region of Canada - ANSWER>a
If the primary of a transformer were connected to a dc power source, the transformer would have a voltage output
a. at higher efficiency than with an ac source
b. none of these
c. only while being connected or disconnected
d. this is also dc
e. the same - ANSWER>c
ANSWERS | 2026 UPDATE | WITH
COMPLETE SOLUTIONS
Rub electrons from your hair with a comb and the comb becomes
a. discharged
b. negatively charged
c. positively charged - ANSWER>b
The source of all magnetism is
a. tiny pieces of iron
b. ferromagnetic materials
c. moving electric charge
d. none of these
e. tiny domains of aligned atoms - ANSWER>c
The vibrations of a longitudinal wave move in a direction
,a. along the direction of wave travel
b. that changes with speed
c. at right angles to the direction of wave travel - ANSWER>a
When two lamps are connected in parallel to a battery, the electrical resistance that the batters senses is
a. more than the resistance of either lamp
b. none of these
c. less than the resistance of either lamp - ANSWER>c
Sound travels faster in
a. air
b. a vacuum
c. water
d. sound travels about the same in all of these
e. steel - ANSWER>e
compressions and rarefactions are characteristic of
, a. neither of these
b. transverse wave
c. both longitudinal and transverse waves
d. longitudinal waves - ANSWER>d
If we think of the Earth as a magnet, its magnetic north pole is nearest
a. Australia
b. both of these
c. the Hudson Bay region of Canada - ANSWER>a
If the primary of a transformer were connected to a dc power source, the transformer would have a voltage output
a. at higher efficiency than with an ac source
b. none of these
c. only while being connected or disconnected
d. this is also dc
e. the same - ANSWER>c
