4. An incompressible fluid of density ρ is in a bucket on the elevator floor accelerating upward with acceleration a. What is the pressure difference between two points in the fluid separated by a vertical distance △h? (Gravitational acceleration is g)
(A) ρa△h
(B) ρg△h
(C) ρga△h
(D) ρ(g – a)△h
(E) ρ(g + a)△h

30. 依據 GHP 準則，有關「供水設施」之敘述，下列何者不正確？ (A)與食品直接接觸及清洗食品設備與用具之用水及冰塊，應符合飲用水水質標準 (B)使用地下水源者，其水源與化糞池、廢棄物堆積場所等污染源，應至少保持十公尺 之距離 (C)蓄水池（塔、槽）應保持清潔，設置地點應距污穢場所、化糞池等污染源三公尺以 上 (D)蓄水設施供應食品作業場所者，每年至少清理一次並作成紀錄，餘者每二年至少清 理一次並作成紀錄

1. 1.25 × 0.25 + 1.222 = ______. (A) 1.5345 (B) 1.535 (C) 1.53 (D) 1.5 (E) 2

2. Over a short interval near time t = 0 the coordinate of a bicycle in meters is given by x(t) = 12t – 4t3 where t is in seconds. At the end of 1 s, what is the acceleration of the bicycle? (A) 23 m/s2 (B) 15 m/s2 (C) -4 m/s2 (D) -12 m/s2 (E) -24 m/s2

3. A 8000-N trunk is pushed along a level road by two men who apply a total forward force of 1000 N. Neglecting friction, what is the acceleration of the trunk? (Gravitational acceleration g = 10 m/s2) (A) 0.0125 m/s2 (B) 0.125 m/s2 (C) 0.8 m/s2 (D) 1.25 m/s2 (E) 8 m/s2

5. The figure shows a standing wave pattern in a string. What is the wavelength of one of the component traveling waves? (A) 10 cm (B) 20 cm (C) 40 cm (D) 60 cm (E) 120 cm

6. The figure shows four situations in which a source of sound S and a detector D are either moving or stationary. The arrows indicate the directions of motion. The speeds (when not zero) are all the same. (Note that the detector in situation ③ is stationary). Rank the situations according to the apparent frequency of the source, lowest to highest. (A) ①,②,③,④ (B) ④,③,②,① (C) ①,③,②,④ (D) ②,①,④,③ (E) ②,①,③,④

7. What is the deterministic factor of a sound wave for the sound pitch? (A) amplitude (B) frequency (C) phase (D) speed (E) intensity

8. A sample of an ideal gas is taken through the cyclic process abca shown in the figure. The scale of the vertical axis is set by = 15 kPa and = 5 kPa. At point a, T = 200 K. What is the temperature of the gas at point c? (A) 400 K (B) 600 K (C) 1419 K (D) 1800 K (E) 4258 K

9. An engine does 15 kJ of work while exhausting 37 kJ to a cold reservoir. What is the efficiency of the engine? (A) 28.8 % (B) 38.8 % (C) 68.8 % (D) 88.8 % (E) 98.8 %

10. The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T that are perpendicular to the page. A set of directions A through H is shown next to the figure. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of ______.  (A) A (B) E (C) F (D) G (E) H