Physics MCQ series - 41

Phy-Q,

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401:  A wooden board 2 meters long, 30 centimeters wide and 4 centimeters thick floats in water with 1 centimeter of its thickness above the surface.  The mass of the board is:

w)  1.8 kilograms

x)   18 kilograms

y)   24 kilograms

z)  176 kilograms

ANSWER:  X -- 18 KILOGRAMS 

402:  The minimum number of forces with unequal magnitudes whose vector sum can equal zero is:

w)    1

x)    2

y)    3

z)    4

ANSWER:  Y -- 3

403:  A hiker stands at the bottom of steep hill.  The hiker may follow a straight line path to the top of the hill, a distance of 300 feet, or she may follow a zig-zag path to the top of the hill and walk a distance of 600 feet.  The work done by the force of gravity along the zig-zag path is how many times the work going along the straight path?  Is it:

w)  equal

x)  twice

y)  4 times

z)  8 times?

ANSWER:  W -- EQUAL

404:  A pendulum is displaced through an arc of 1o.  When the pendulum is released, it takes the pendulum 1 second to swing through the 1o arc.  How long would it take the pendulum to swing through a 2o arc? Is it:

w)  1/2 second

x)  1 second

y)  2 seconds

z)  4 seconds

ANSWER:   X -- 1 SECOND

405:  A perfectly spherical bubble of air is suspended in a tank of water.  A beam of light consisting of parallel rays passes through the bubble.  As the light emerges from the opposite side of the bubble the light rays:

w) diverge

x) converge

y) are unaffected

ANSWER:  W -- DIVERGE

406:  An explorer is riding his camel in the desert.  Up ahead he sees what appears to be a pool of water.  He can tell if it is a real pool of water or a mirage by putting on his polarized sun glasses because:

w)  the mirage is polarized and reflections from the water are not

x)  reflections from water are polarized while the mirage is not

y)  neither are polarized so one will not be able to discern a difference

z)  both are polarized so one will not be able to discern a difference 

ANSWER:   X -- REFLECTIONS FROM WATER ARE POLARIZED WHILE THE MIRAGE S NOT

407:  What name is given to the class of subatomic particles which include the proton, the neutron, and several heavier particles, such as the lambda, the sigma and the omega.

ANSWER:   BARYONS

408:  What is the SI unit for pressure?

w)  Torr

x)  pounds per square inch

y)  Pascal

z)  Kelvin

ANSWER:   Y -- PASCAL

409:  A virtual image always appears: 

w)  larger than object

x)  inverted

y)  erect

z)  same size as object

ANSWER:  Y -- ERECT

410:  How many quarks make up a proton?

ANSWER:   3