Which of the following reaction energies is the least exothermic (but still an exothermic reaction)?
A) 540 kJ/mole
B) -540 kJ/mole
C) 125 kJ/mole
D) -125 kJ/mole
E) not enough information given
Answer: D
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If iron with 4.3 wt. % carbon is heated to 850°C for an extended period of time, what is the resulting form of cast iron?
(a) White (b) Malleable (c) Gray (d) Nodular
Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline. The acceleration up the incline is 1.00 
and the velocity is up the incline. The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The coefficient of kinetic friction is 0.200. The tension in the string is
A. 2,660 N. B. 1,140 N. C. 980 N. D. 875 N. E. 633 N.
A parallel-plate capacitor has a plate separation of 5.0 cm. If the potential difference between the plates is 2000 V, with the top plate at the higher potential, what is the electric field between the plates?
A) 100 N/C upward B) 100 N/C downward C) 4000 N/C downward D) 40000 N/C upward E) 40000 N/C downward
What causes stars to twinkle?
A) It is intrinsic to the stars—their brightness varies as they expand and contract. B) variations in the absorption of light at different depths in Earth's atmosphere C) variable absorption by interstellar gas along the line of sight to the star D) bending of light rays by turbulent motions of air in Earth's atmosphere E) the inability of the human eye to focus on small points of light