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Physics MCQ series - 03

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21 :  If the distance between two objects, each of mass 'M', is tripled, theforce of attraction between the two objects is: 


w)  1/2 the original force
x)  1/3 the original force
y)  1/9 the original force
z)  unchanged


ANSWER:   Y -- 1/9 THE ORIGINAL FORCE


22 :  A 40 kilogram girl climbs a vertical distance of 5 meters in twenty seconds at a constant velocity.   How much work has the girl done?

ANSWER:   2000 JOULES or 1960 JOULES


23 :  A machine performs 8 Joules of work in 2 seconds.  How much power is delivered by this machine?

ANSWER:   4  WATTS


23 :  In physics, a radian per second is a unit of:

w) angular displacement
x) angular velocity
y) angular acceleration
z) angular momentum.

ANSWER:   X -- ANGULAR VELOCITY


24 :  If the resultant force acting on a body of constant mass is zero, the body's momentum is:

w) increasing
x) decreasing
y) always zero
z) constant

ANSWER:   Z -- CONSTANTScience Bowl PHYSICS


25 :  What is the name of the first American physicist to win two Nobel prizes?

ANSWER:   (JOHN) BARDEEN


26 :  Which of the following scientists is responsible for the exclusion principle which states that two objects may NOT occupy the same space at the same time?  Was it:

w) Heisenberg
x) Bohr
y) Teller
z) Pauli

ANSWER:   Z -- PAULI


27 :  Who shared the Nobel Prize in Physics in 1909 with Guglielmo Marconi for his contribution to the development of wireless telegraphy?

ANSWER:   (CARL FERDINAND) BRAUN


28 :  Who first theoretically predicted the existence of the positron, a positively charged electron?  He received the Nobel Prize in Physics in 1933.

ANSWER:   (PAUL ADRIEN MAURICE) DIRAC


29 :  Name the female physicist who received the Nobel Prize in 1963 for her discovery concerning the shell structure of the nucleus.

ANSWER:   (MARIA GOEPPERT) MAYER


30 :  The constant potential difference across a 2 ohm resistor is 20 volts. How many watts of power are dissipated by this resistor?


ANSWER:   200 WATTS
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