PhysicsLAB: 1998 Physics Quiz Bowl (Part 1)

AAPT Quiz
1998 Physics Quiz Bowl (Part 1)

1. Which of the following is not a vector quantity?

accelerationelectric fieldenergyforcevelocity

2. An observer hears a sound with frequency 400 hz. Its wavelength is approximately

0.85 m1.2 m2.75 m13.6 m44 m

3. An object in equilibrium has three forces, F₁ of 30 N, F₂ of 50 N, and F₃ of 70 N, acting on it. The magnitude of the resultant of F₁ and F₂ is

10 N20 N40 N70 N80 N

4. As sound travels from steel into air, both its speed and its

wavelength increase.
wavelength decrease.
frequency increase.
frequency decrease.
frequency remain unchanged.

5. Which of the following temperatures would be most appropriate to keep milk at inside a refrigerator?

-200 C5 K400 C278 K350 K

6. When any four resistors are connected in parallel, the ____ each resistor is the same.

charge oncurrent throughpower fromresistance ofvoltage across

7. A heat engine takes in 200 J of thermal energy and performs 50 J of work in each cycle. What is its efficiency?

500%400%25%20%12%

8. When two charged point-like objects are separated by a distance R, the force between them is F. If the distance between them is quadrupled, the force between them is

16 F4 FFF/4F/16

9. An electroscope is given a positive charge, causing its foil leaves to separate. When an object is brought near the top plate of the electroscope, the foils separate even further.

We could conclude

that the object is positively charged.
that the object is electrically neutral.
that the object is negatively charged.
only that the object is charged.
only that the object is uncharged.

10. A charged particle with constant velocity enters a uniform magnetic field whose direction is parallel to the particle's velocity. The particle will

speed up.
slow down.
experience no change in velocity.
follow a parabolic arc.
follow a circular arc.

11. In the nuclear reaction ⁶ ₃Li + ? yields ⁷ ₃Li the "?" represents

an alpha particlea deuteronan electrona neutrona proton

12. An alpha particle is the same as

a helium nucleusa positronan electrona high energy photona deuteron

13. When a falling object moves with terminal velocity, it

has zero velocity.
has zero acceleration.
has an upward acceleration.
is no longer subject to air resistance.
has an acceleration of approximately 10 m/sec².

14. How long must a 2.5 m/s² acceleration act to change the velocity of a 2.0-kg object by 3.0 m/s?

0.83 sec1.2 sec1.7 sec2.5 sec7.5 sec

15. A freely falling object is found to be moving downward at 18 m/s. If it continues to fall, two seconds later the object would be moving with a speed of

8.0 m/s10 m/s18 m/s38 m/s180 m/s

16. If the unit for force is F, the unit for velocity v, and the unit for time T, then the unit for momentum is

FTFTvFT²vFT/vFv/T

17. Which diagram best represents what happens to a ray of light entering air from water? Air is at the top in all diagrams.

18. When a train is at rest, both a passenger on the train and a ticket seller on the station agree that the trains whistle produces sound at a frequency of 120 Hz. When the train is moving away from the station at 15 m/s, the passenger hears a frequency of ______ Hz and the ticket seller hears a frequency of ____ Hz.

120, 125115, 120120, 120115, 115120, 115

19. In order to produce an enlarged, upright image of an object, you could use a

converging lens more than one focal length from the object.
converging lens less than one focal length from the object.
diverging lens more than one focal length from the object.
diverging lens exactly one focal length from the object.
diverging lens less than one focal length from the object.

20. Wire I and wire II are made of the same material. Wire II has twice the diameter and twice the length of I. If I has resistance R, II has resistance

R/8R/4R/2R2R