Py Quiz

PHYS1001 Quiz 1 19 September 2012 (Wed) 1. The asteroid that killed the dinosaurs exploded because… a. it was made of explosive material. b. it was made out of U-235. c. it got very hot from the impact. d. it didn’t explode; it knocked the Earth out of its normal orbit. 2. Which of the following contains the most energy per gram? a. TNT. b. Chocolate chip cookies. c. Battery. d. Uranium. 3. You have 10 tungsten bulbs, and each uses 100 watts. You leave them all on for an hour. The energy used is… a. 10 kilowatt-hours. b. 1 kilowatt-hour. c. 10 kilowatts. d. 1000 watts. 4. In the operation of an MP3 player, not all the final forms of energy are useful to us. Which of the following is correct? Useful final form of energy Wasted final form of energy a. Electrical energy Heat energy b. Heat energy Light energy c. Kinetic energy Heat energy and sound energy d. Sound energy Heat energy 5. Which of the following statements is wrong? a. Kinetic energy is related to how fast an object moves. b. Solar energy is an unlimited energy source. c. Wind energy is a renewable energy source. d. Nuclear energy is a clean energy source. 21 September 2012 (Fri) 1. Kinetic energy can be measured in… a. watts. b. calories. c. grams. d. amperes.

2. Which is least expensive – for the same energy delivered? a. Coal. b. Gasoline. c. Natural gas. d. AAA batteries. 3. Solar intensity is about (choose ALL that are correct)… a. 1 watt per square meter. b. 1 kW per square meter. c. 1 megawatt per square km. d. 1 gigawatt per square km. 4. Which of the following devices involves the conversion of electrical energy to potential energy? a. Generator. b. Passenger lift. c. Solar cell. d. Toaster. 5. Which of the following statements is true? a. Energy is measured in joules, and power is measured in calories. b. Power is energy divided by time. c. Battery releases energy, but TNT releases power. d. Power signifies a very large amount of energy. Exercise 5. Hydrogen fuel cells cannot be classified as...