Fall-2013-Sci-25-Exam-II (1)

Science 25 Fall 2013 Prof. Mancini _____________________________ NAME EXAM I _____1. According to ____________’s Law, current and potential difference are inversely proportional. a) Newton b) Coulomb c) Claussius d) Ohm e) mancini _____2. ______________ are nearly 2000 times heavier than _____________. a) protons, neutrons b) neutrons, alpha particles c) electrons, protons d) protons, electrons e) neutrons, photons _____3. An example of a positive electric monopole is a(n) a) neutron b) proton c) electron d) gamma e) neutrino _____4. An accelerating electric charge produces a) only an electric field b) only a magnetic field c) a neutral field d) both an electric and magnetic field e) a field proportional to the inertia of the particle _____5. The electric energy lost when a current passes through a resistance a) becomes gamma radiation b) becomes magnetic energy c) becomes electric energy d) disappears completely e) becomes heat energy _____6. All magnetic fields originate in a) permanent magnets b) electromagnets c) iron atoms d) all metallic atoms e) moving electric charges _____7. Twenty milliamps pass through a 50 kilo-ohm resistor. What is the potential difference? a) 1 V b) 10 V c) 100 V d) 1 kV e) 1 MV _____8. Twelve 6  resistors are connected in parallel. What is the equivalent resistance? a) 72  b) 2  c) 0.5  d) 24  e) none of these

_____9. Twenty identical resistors R are connected in parallel and have an equivalent resistance of 0.5  . What is the value of R? a) 0.5  b) 5  c) 50  d0 20  e) 10  _____10. What happens to the electric force between two charges if each charge is doubled while the separation is also doubled? a) increase 4x b) increase 16x c) decrease 4x d) decrease 16x e) no change _____11. A water wave travels at a speed of 6 m/s with a wavelength of 2 m. What is the frequency of this wave? a) 12 Hz b) 3 Hz c) 0.6 Hz d) 24 Hz e) none of these _____12. ___________ waves cannot travel through the vacuum of outer space. a) sound b) x-rays c) radio d) UV e) gamma _____13. Which of the following waves can be polarized? a) gamma b) x-rays c) UV d) visible e) all of these _____14. Sixteen 2  resistors are connected in series. What is the equivalent resistance? a) 32  b) 1/8  c) 1/32  d) 18  e) none of these _____15. In a junkyard there is great use for a(n) a) superconductor b) magnetic monopole c) Tesla coil d) electromagnet e) permanent magnet _____16. Ions in the body are called a) minerals b) electrolytes c) vitamins d) hemoglobin e) bile _____17. A transformer can change a) the voltage of an alternating current b) the power of an alternating current c) alternating current to direct current d) direct current to alternating current e) all of these

_____28. The ____________ has approximately the same mass as a proton. a) positive beta b) negative beta c) neutron d) electron e) deuterium _____29. The heaviest isotope is hydrogen is a) helium b) deuterium c) tritium d) radium e) positronium _____30. When a nucleus is unstable, we say it is a) ionic b) atomic c) radioactive d) isotropic e) arthritic _____31. If Niobium (element 41) undergoes 6  , 10  + , 4  - , and 2  decays, the resulting nucleus is a) Ga b) Ni c) Cu d) Se e) Kr _____32. If Einsteinium (element 99) undergoes 14  , 18  + , 22  - , and 10  decays, the resulting nucleus is a) Po b) Ra c) At d) Pb e) Fr _____33. Particles fond in the nucleus are collectively called a) positrons b) neutrons c) protons d) nucleons e) neutrinos _____34. In a breeder reactor, the fuel that is being bred is a) 235 U b) ) 238 U c) ) 239 U d) ) 239 Pu e) ) 235 Pu _____35. A particle of electromagnetic radiation is called a(n) a) photon b) positron c) neutrino d) beta e) quark _____36. The half life of 90 Sr is 28 years. After 7 years, what fraction would remain? a) 7% b) 25% c) 75% d) 90% e) need to know the mass of the sample

_____37. Sound waves may be considered to be a) EM radiation b) transverse waves c) longitudinal waves d) carriers of photons e) excited beta particles in motion _____38. An example of a coherent light source is a) the sun b) a fluorescent light c) an incandescent light d) a laser e) a headlight _____39. Complete the following nuclear reaction: 11 5 B  7 3 Li + _______ a)  + b)  - c) alpha d) gamma e) none of these _____40. Complete the following nuclear reaction: ________  4 2 He + 222 86 Rn a) 218 88 Hf b) 226 88 Ra c) 226 88 Frd) 218 86 Re e) none of these _____41. If Thorium (element 90) undergoes twelve alpha decays, the resulting nucleus is a) Dy b) Db c) Ir d) Pt e) Er _____42. If Einsteinium (element 99) undergoes 4  - decays, 10  + decays , 6 alpha decays , and 22 gamma decays, the resulting nucleus is a) Po b) Pt c) Ir d) Ti e) Rn _____43. After 60 days, only 1/16 of an original sample of element X remains. What is the half life of element X? a) 16 days b) 4 days c) 42 days d) 8 days e) 15 days _____44. The half-life of element Y (which transforms into element X) is 12 hours. After two days what fraction of the original sample has become element X? a)1/8 b) ¼ c) 1/8 d) 1/16 e) 15/16