Wednesday, May 1, 2013

As a source of sound approaches a stationary listener, the apparent wavelength:


Q-1: As a source of sound approaches a stationary listener, the apparent wavelength:
1) increases
2) decreases
3) stays the same.
ANSWER: 3 -- DECREASES
Q-2:  The particle nature of light is demonstrated by which of the following?
1) the photoelectric effect
2) the various colors of light
3) the speed of light
4) diffraction.
ANSWER: 1 -- THE PHOTOELECTRIC EFFECT
Q-3: A wavelength is commonly measured in which one of the following units?
1) radians
2) angstroms
3) electron volts
4) seconds
ANSWER: 2 -- ANGSTROMS
Q-4:  Which of the following three nuclear radiations is the most penetrating?
1) alpha
2) beta
3) gamma
ANSWER: 3 -- GAMMA
Q-5: An electrical current in a superconducting ring will theoretically flow unchanged for:
1) several milliseconds
2) a second
3) several weeks
4) forever
ANSWER: 4 -- FOREVER
Q-6: What three colors form the picture in a color tv?
ANSWER: RED GREEN BLUE
Q-7:  What is the name of the process whereby waves travel around corners and obstacles in their paths?
ANSWER: DIFFRACTION
Q-8:  The physicist Chadwick is known for his association with:
1) the alpha particle
2) the neutron
3) the cloud chamber
4) the electron
ANSWER: 2 -- THE NEUTRON
Q-9: A color with a wavelength longer than that of yellow is:
1) red
2) blue
3) violet
4) green
ANSWER: 1 -- RED
Q-10:  The knot is a nautical measure of:
1) length
2) speed
3) acceleration
4) displacement
ANSWER: 2 -- SPEED
Q-11: Assuming constant gravity and no air resistance, the path of a cannonball fired from a cannon is:
1) a semi-circle
2) an ellipse
3) a parabola
4) a hyperbola
ANSWER: 3 -- A PARABOLA
Q-12:  As you go up a mountain top, your weight:
1) increases slightly
2) decreases slightly
3) remains exactly the same.
ANSWER: 2 -- DECREASES SLIGHTLY
Q-13:  The shape of a magnetic field around a long straight current carrying wire is:
1) elliptical.
2) square
3) varies depending on the magnitude of the current
4) circular
ANSWER: 4 -- CIRCULAR
Q-14: What number represents the ratio of speed of an object to the speed of sound in the surrounding air?
ANSWER: MACH NUMBER

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