Science news.Name: -- DIRECTIONS: Read the Science News section on pages 4 to 7. Then, test your knowledge by filling in the letter of the correct answer below. 1. Saturn has -- rings made of densely packed --. (A) three; methane and ice (B) six; rock, sulfur, and silica (C) seven; ice, dust, and rock (D) nine; dust, ice, and silica 2. Which of the following statements does NOT describe Saturn's F-ring? (A) It orbits in the opposite direction of Saturn's other rings. (B) It is a spiraling structure. (C) It wraps around Saturn several times. (D) It is slowly winding tighter around Saturn. 3. A scientist believes that Taipei 101 is triggering earthquakes, Which of the following is NOT one of his reasonings? (A) The structure builds stress on underground faults. (B) There have been more earthquakes in Taiwan since the building's completion. (C) There have been more intense earthquakes in Taiwan since the building's completion. (D) The building's weight is distributed over a broad area. 4. The -- scale is a scientific measure of an earthquake's strength. (A) Richter (B) Torino (C) Saffir-Simpson (D) Fujita 5. Ants' food-trail markers are made of chemical signals called --. (A) DNA DNA: see nucleic acid. DNA or deoxyribonucleic acid One of two types of nucleic acid (the other is RNA); a complex organic compound found in all living cells and many viruses. It is the chemical substance of genes. (B) steroids steroids, class of lipids having a particular molecular ring structure called the cyclopentanoperhydro-phenanthrene ring system. Steroids differ from one another in the structure of various side chains and additional rings. (C) pheromones pheromones, any of a variety of substances, secreted by many animal species, that alter the behavior of individuals of the same species. Sex attractant pheromones, secreted by a male or female to attract the opposite sex, are widespread among insects. (D) neurotransmitters Neurotransmitters Chemicals within the nervous system that transmit information from or between nerve cells. Mentioned in: Bulimia Nervosa, Impotence, Pain, Withdrawal Syndromes 6. Wild pandas' biggest threat is (A) diseases. (B) poaching poaching: see cooking. . (C) habitat loss. (D) reproductive problems. 7. Since the 1980s, the number of wild pandas has increased by nearly -- percent. (A) 22 (B) 35 (C) 50 (D) 67 8. -- is a unit of frequency, or number of -- per second. (A) Watts, beats (B) Amps, sound waves (C) Pitch, pulses (D) Hertz hertz (hûrts) [for Heinrich R. Hertz], abbr. Hz, unit of frequency, equal to 1 cycle per second. The term is combined with metric prefixes to denote multiple units such as the kilohertz (1,000 Hz), megahertz (1,000,000 Hz), and gigahertz , vibrations 9. Older people can't hear the "Mosquito" because (A) they wear special ear plugs. (B) as people age, they lose their ability to hear certain high-frequency tones. (C) they can't hear the device's low-pitch sounds. (D) aging causes them to lose their ability to hear high-energy waves. 10. By using the hand crank in MIT's new laptop, -- energy drives a(n) -- to recharge re·charge tr.v. re·charged, re·charg·ing, re·charg·es To charge again, especially to reenergize a storage battery. re the computer's battery. (A) kinetic, processor (B) potential, microchip (1) Another term for a microminiaturized integrated circuit (a "chip"). (2) To insert an RFID tag beneath the skin of an animal. It is expected that some day, humans will be microchipped. (C) kinetic, electric generator (D) potential, turbine ANSWERS 1. c 2. a 3. d 4. a 5. c 6. c 7. c 8. d 9. d 10. c |
|
||||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion