Physics MCQ series - 09

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

w) increases

x) decreases

y) remains the same

z) decreases, then remains the same

ANSWER :    W – INCREASES

82:  Two vibrating particles that are "out of phase" differ in the phase of their vibration by:

w) 1/4 cycle

x) 1/2 cycle

y) 3/4 cycle

z) 1 cycle

ANSWER :    X -- 1/2 CYCLE

83:  The SI unit of pressure is the:

w) Torr

x) Dyne per centimeter squared

y) Atmosphere

z) Pascal

ANSWER :    Z -- PASCAL Science Bowl PHYSICS

84:  An electroscope charged WITHOUT contacting a charged body is charged by:

w) Induction

x) Conduction

y) Convection

z) Insulation

ANSWER:    W – INDUCTION

85:  The potential drop between the terminals of a battery is equal to the battery's EMF when:

w) No current is drawn from the battery

x) A very large current is drawn from the battery

y) The internal resistance of the battery is very large

z) The resistance in the external circuit is small

ANSWER :    W -- NO CURRENT IS DRAWN FROM THE BATTERY

86:  To convert a galvanometer to a voltmeter, you should add a:

w) High resistance in series

x) High resistance in parallel

y) Low resistance in series

z) Low resistance in parallel

ANSWER:    W -- HIGH RESISTANCE IN SERIES

87:  The greatest induced EMF will occur in a straight wire moving at constant speed through a uniform magnetic field when the angle between the direction of the wire's motion and the direction of the magnetic field is

w) 0 degrees

x) 30 degrees

y) 60 degrees

z) 90 degrees

ANSWER:    Z -- 90 DEGREES Science Bowl PHYSICS

87:  A 10 volt battery connected to a capacitor delivers a charge of 0.5 coulombs.  The capacitance of the capacitor is:

w) 2 x 10-2 farads

x) 5 x 10-2 farads

y) 2 farads

z) 5 farads

ANSWER:    X -- 5 x 10-2 FARADS

88:  Two light rays will interfere constructively with maximum amplitude if the path difference between them is:

w) One wavelength

x) One-half wavelength

y) one-quarter wavelength

z) one-eighth wavelength

ANSWER:    W -- ONE WAVELENGTH

89:  Light is normally incident on a thin soap film and is reflected.  If the wavelength of this light is "L" and the index of refraction of the soap film is "N", complete destructive interference will occur for a film hickness of:

w) L / 8N

x) L / 4N

y) L / 2N

z) 3L / 4N

ANSWER:    Y -- L / 2N

90:  The Michelson interfero meter was designed to study the nature of:

w) Water waves

x) Sound waves

y) An "ether"

z) Sunlight

ANSWER:    Y -- AN "ETHER" Science Bowl PHYSICS

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