1. The nucleus of a certain isotope of tin contains 68 neutrons and 50 protons. Which symbol correctly represents this isotope? A.
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1 Page 1 of 6 1. The nucleus of a certain isotope of tin contains 68 neutrons and 50 protons. Which symbol correctly represents this isotope? A. B. C. D. E. 2. A guitar string produces 4 beats/s when sounded with a 250 Hz tuning fork and 9 beats per second when sounded with a 255 Hz tuning fork. What is the vibrational frequency of the string? A. 240 Hz B. 246 Hz C. 254 Hz D. 259 Hz E. 263 Hz 3. What is the magnitude of the electric field due to a C charge at a point m away? A N/C B N/C C N/C D N/C E N/C 4. Which one of the following statements concerning the image formed by a concave spherical mirror is true? A. When the object distance is less than the focal length, the image is virtual.
2 Page 2 of 6 B. When the object distance is larger than the focal length, the image is virtual. C. When the object is at the center of curvature, the image is formed at infinity. D. When the object distance is less than the focal length, the image is inverted relative to the object. E. When the object distance is larger than the focal length, the image is upright relative to the object. 5. How much force does the atmosphere exert on one side of a vertical wall 4.00-m high and 10.0-m long? A N B N C N D N E N 6. What mass of water (at 4.0 C) can be contained in a rectangular box whose dimensions are 10.0 cm by 5.00 cm by 1.00 cm? The density of water at 4.0 C is kg/m 3. A. 5.0 g B g C g D g E kg 7. Which one of the following statements best explains why tiny bits of paper are attracted to a charged rubber rod? A. Paper is naturally a positive material. B. Paper is naturally a negative material. C. The paper becomes polarized by induction. D. Rubber and paper always attract each other. E. The paper acquires a net positive charge by induction. 8. A 4-m long string, clamped at both ends, vibrates at 200 Hz. If the string resonates in six segments, what is the speed of transverse waves on the string? A. 100 m/s B. 133 m/s
3 Page 3 of 6 C. 267 m/s D. 328 m/s E. 400 m/s 9. At what separation will two charges, each of magnitude 6 μc, exert a force of 1.4 N on each other? A m B m C m D. 2.0 m E. 40 m 10. A car moving at 35 m/s approaches a stationary whistle that emits a 220 Hz sound. The speed of sound is 343 m/s. What is the frequency of sound heard by the driver of the car? A. 198 Hz B. 220 Hz C. 242 Hz D. 282 Hz E. 340 Hz 11. An object is 1.0 m in front of a mirror. A virtual image is formed 10.0 m behind the mirror. What is the radius of curvature of the mirror? A m B. 1.1 m C. 2.2 m D. 4.4 m E. 10 m 12. A conducting sphere has a net charge of C. What is the approximate number of excess electrons on the sphere? A. 100 B. 200 C. 300
4 Page 4 of 6 D. 400 E Which one of the following processes is illustrated by the reaction: A. beta decay B. alpha decay C. gamma decay D. neutrino emission E. positron emission 14. The radius of curvature of a spherical convex mirror is 50 cm. What is its focal length? A. +25 cm B. 25 cm C. +50 cm D. 50 cm E cm 15. A convex mirror with a focal length of 58 cm is used to form an image that is 29 cm behind the mirror. What is the object distance? A. +22 cm B. +15 cm C. +69 cm D. +28 cm E. +58 cm 16. What is the mass defect of (atomic mass = u)? The hydrogen atom has a mass of u; and the neutron has a mass of u. A kg B kg C kg
5 Page 5 of 6 D kg E kg 17. The density of ice is 0.92 g/cm 3 ; and the density of seawater is 1.03 g/cm 3. A large iceberg floats in Arctic waters. What fraction of the volume of the iceberg is exposed? A % B. 11 % C. 89 % D. 92 % E. 99 % 18. What is the approximate radius of a carbon nucleus that has six protons and six neutrons? A m B m C m D m E m 19. A periodic wave is produced on a stretched string. Which one of the following properties is not related to the speed of the wave? A. frequency B. amplitude C. period D. wavelength E. tension in the string 20. Which one of the following statements concerning the buoyant force on an object submerged in a liquid is true? A. The buoyant force depends on the mass of the object. B. The buoyant force depends on the weight of the object. C. The buoyant force is independent of the density of the liquid. D. The buoyant force depends on the volume of the liquid displaced.
6 Page 6 of 6 E. The buoyant force will increase with depth if the liquid is incompressible.
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