Deuterium and tritium are both
A) forms of hydrogen.
B) isotopes of the same element.
C) both of these
D) neither of these
Answer: C
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In a laboratory on Earth, all the air is pumped from a large tube. A feather and a steel ball are simultaneously released from rest inside the tube. What happens next?
A. The feather falls and hits the bottom before the steel ball B. The steel ball falls and hits the bottom before the feather C. Both objects float weightless inside the tube D. Both objects fall and hit the bottom at the same time
For an angle of one degree, to how many significant figures do sin 
and 
(in radians) agree?
A. 3 B. 4 C. 5 D. 6 E. 7
Composite particles that are composed of three quarks are called
A) bosons. B) baryons. C) leptons. D) hadrons. E) mesons.
A ray in air is incident on a glass plate whose index of refraction is 1.42. The angle of refraction is one half the angle of reflection. The angle of refraction is closest to:
A) 45° B) 43° C) 41° D) 39° E) 37°