1. The sun produces energy by A. Fusiorn B. Gravitational contraction C. Fission
ID: 2029696 • Letter: 1
Question
1. The sun produces energy by A. Fusiorn B. Gravitational contraction C. Fission D. Neutrinos E. The gravitational pull of the moon 2. Which atom has the most number of neutrons? A. Oxygen B. Helium C. Boron D. Hydrogen E. Argon 3. Aircraft wings provide lift because of A. Huygen's Principle B. Kepler's third Law C. Newton's second Law D. Bernoulli's equation E. Brownian motion 4. What is the power necessary to produce 3,000 J in ten minutes? A. 5W B. 20 mW C. 100W D. 80 MW E. 3000W 5. An Incandescent bulb and an LED output the same amount of light. Which of them is more eficient? A. LED B. Incandescent bulb C. Same efficiency since they output same amount of light D. It depends on the color of the light E. It depends on the time length they are being used. 6. Which of the following is NOT a unit of energy? A. Calorie B. Joule C. kW D. eV E. BTU 7. The concentration of C02 molecules in the Earth's atmosphere is about: A.3% B. 0.04% C.30% D, 70% E. 1%Explanation / Answer
1. fusion
2.argon
3. bernoulli equation
4. power = work /time = 3000/10*60 = 5W
5..LED
6. KW
7. .04%
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