As a pendulum is raised to higher altitudes, its period:

Q-1;  As a longitudinal wave moves through a medium, the particles of the medium:

1) vibrate in a path parallel to the path of the wave
2) vibrate in a path perpendicular to the path of the wave
3) follow the wave along its entire path
4) do not move
ANSWER: 1 -- VIBRATE IN A PATH PARALLEL TO THE PATH OF THE WAVE

Q-2;  As a pendulum is raised to higher altitudes, its period:

1) increases
2) decreases
3) remains the same
4 decreases, then remains the same
ANSWER: 1 -- INCREASES

Q-3; Two vibrating particles that are "out of phase" differ in the phase of their vibration by:

1) 1/4 cycle
2) 1/2 cycle
3) 3/4 cycle
4) 1 cycle
ANSWER: 2 -- 1/2 CYCLE

Q-1; The SI unit of pressure is the:

1) Torr
2) dyne per centimeter squared
3) atmosphere
4) pascal
ANSWER: 4 -- PASCAL