20. The following fgure shows a conductive sphere with a spherical cavity in the center. The total charge on the conductor is zero, but a point charge Q is placed at the center of the cavity. How does the electric potential (V) as a function of the distance from the center (r) looks like?
(A)
(B)
(C)
(D)
(E)

複選題21. Two balls of masses my = 1 kg and mo = 100 kg, with initial speed 1 m/s and 10 m/s, respectively, collide inelastically in space. They stick together after the collision. Which of the following is true in the Center of Mass Frame? (A) The total momentum does not change； (B) The total kinetic energy does not change； (C)The magnitude of velocity change of me is less than that of mi； (D) The magnitude of momentum change of me is less than that of my； (E) The magnitude of kinetic energy change of me is less than that of my.

複選題22. Consider a damped harmonic oscillator, which of the following is true?(A) If it is underdamped, the resonant frequency increases with larger damping； (B) If it is underdamped, the amplitude decays faster with larger damping； (C)If it is underdamped, and is driven by an external sinusoidal force, the amplitude of the oscillation is maximum if the frequency of the force is the same as the resonance frequency； (D) In order to damp the kinetic energy and the elastic energy as fast as possible, one should design the oscillator to be at critical damping condition； (E) If it is overdamped, the system does not oscillate and returns to the equilibrium position slowly. 

複選題23. A square conductive loop of side L and resistance R is pulled with constant speed u out of a uniform magnetic field B. The magnetic feld is perpendicular to and pointing into the plane of the loop, as shown in the figure. Which of the following is correct?(A) The induced EMF is BLu； (B) The induced current is BLU/R； (C)The force required to pull the loop is B2L2u/R； (D) The power required to pull the loop is B2L2U2/R2； (E) The direction of the electric current is clockwise.

複選題24. A magnetic dipole made of a conductive ring carrying a current I. Observ- ing from far away； which of the following statements are FALSE?(A) If the magnetic dipole is placed in a uniform magnetic feld, it experiences no net magnetic force. (B) The magnetic dipole experiences a net torque if its dipole moment is parallel to the uniform magnetic feld. (C)The magnetic dipole may experience a net force induced by another magnetic dipole. (D) The magnetic field induced by the magnetic dipole is approximately proportional to the area of the ring. (E) The magnetic field induced by the dipole is approximately inversely proportional to the square of the distance from it.

複選題25. Which of the following is a statement or a consequence of 2nd law of thermal dynamics?(A) The efficiency of any heat engine operates between two heat reservoir is less or equal to the Carnot engine. (B) Heat can never pass from a colder to a warmer body without some other changes occurring at the same time. (C)Entropy of an object always increases when it is in contact with a heat reservoir. (D) Isolated perpetual motion machine is not possible.(E) The entropy of a thermal system going through a cyclic process always increases or stays the same after a full cycle.

1. 冷卻器為防止海水產生電化作用 (Voltaic Action) 而腐蝕各部 結構，故裝有 (A) 鋅板 (B) 銅板 (C) 鋁板 (D) 鐵板

2. 船舶上各種管子，不論其管內通過任何流體，在其顯明處 ，必須漆以顏色以資識別，通常冷海水管路漆上 (A) 紅色 (B) 黃色 (C) 綠色 (D) 藍色

3. 船用二衝程柴油機的氣缸蓋上，沒有下列那一種附件？ (A) 進氣閥 (B) 安全閥 (C) 排氣閥 (D) 起動閥

4. 下列何種接頭不適用於高壓管路 (A) 螺紋接頭 (B) 凸緣接頭 (C) 熔焊接頭 (D) 伸縮接頭

5. 下列何種裝置可將送入鍋爐內的給水加熱，以節省燃料？ (A) 過熱器 (B) 節熱器 (C) 再熱器 (D) 降熱器

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