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1. For the hydrogen atom, which series describes electron transitions to the N=1 orbit, the lowest energy electron orbit? Is it the:
w) Lyman series
x) Balmer series
y) Paschen series
z) Pfund series
ANSWER: W -- LYMAN SERIES
2. Electric current may be expressed in which one of the following units?
w) coulombs/volt
x) joules/coulomb
y) coulombs/second
z) ohms/second
ANSWER: Y -- COULOMBS/SECOND
3. In the SI system of measure, what is the unit of capacitance?
ANSWER: FARAD
4. A Newton is equal to which of the following?
w) kilogram-meter per second
x) meter per second squared
y) kilogram-meter per second squared
z) kilogram per meter-second
ANSWER: Y -- KILOGRAM-METER PER SECOND SQUARED
5. For an object moving in uniform circular motion, the direction of the instantaneous acceleration vector is:
w) tangent to the path of motion
x) equal to zero
y) directed radially outward
z) directed radially inward
ANSWER: Z -- DIRECTED RADIALLY INWARD
6. A boy is standing on an elevator which is traveling downward with a constant velocity of 30 meters per second. The boy throws a ball vertically upward with a velocity of 10 meters per second relative to the elevator. What is the velocity of the ball, MAGNITUDE AND DIRECTION, relative to the elevator shaft the instant the boy releases the ball?
ANSWER: 20 METERS PER SECOND DOWN
7. Multiple Choice: Work is equal to which of the following?
w) the cross product of force and displacement.
x) the product of force times time
y) force divided by time
z) the dot product of force and displacement
ANSWER: Z -- THE DOT PRODUCT OF FORCE AND DISPLACEMENT
8. The work done by a friction force is:
w) always positive
x) always negative
y) always zero
z) either positive or negative depending upon the situation.
ANSWER: X -- ALWAYS NEGATIVE
9. As defined in physics, work is:
w) a scalar quantity
x) always a positive quantity
y) a vector quantity
z) always zero
ANSWER: W -- A SCALAR QUANTITY
10. A pendulum which is suspended from the ceiling of a railroad car is observed to hang at an angle of 10 degrees to the right of vertical. Which of the following answers could explain this phenomena?
w) The railroad car is at rest.
x) The railroad car is accelerating to the left.
y) The railroad car is moving with constant velocity to the right.
z) The railroad car is accelerating to the right.
ANSWER: X -- THE RAILROAD CAR IS ACCELERATING TO THE LEFT.
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