Series/Parallel Circuits: If 1.5 A flows through R2, what is the emf V of the ideal battery in the figure?
A. 150 V
B. 75 V
C. 60 V
D. 30 V
Answer: A
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Atomic Nucleus: All nuclei of a given element have the same number of
A. neutrons. B. protons. C. nucleons. D. protons + neutrons.
Elementary Particles: How many quarks are in a tritium isotope, 
H?
A. 2 B. 3 C. 4 D. 6 E. 9
Of the eight known planets in our solar system, the innermost is Mercury. When compared to the other planets in the system, Mercury has the:
a. greatest centripetal acceleration. b. greatest period of revolution. c. smallest angular velocity. d. smallest tangential velocity.
Two massive objects are fixed in position. A third object is placed directly between the first two at the position at which the total gravitational force on the third object due to the two massive objects is zero
The object is displaced slightly toward one of the two massive objects, the total gravitational force on the third object is now A) zero. B) in a direction which depends on which of the massive objects has a greater mass. C) in the same direction the object is displaced. D) in the opposite direction to the displacement of the object. E) perpendicular to the displacement of the object.