資訊推薦

• 10.右圖中的矩形截面受到 40N-m 的力矩，請問抵抗此一力矩而且與變形有關的截面慣性矩(area momentof inertia)的值為何？(A)0.2025 (10 -6  )m4(B) 0.
• 48.斜銷或稱錐形銷(taper pin)，其錐度公制為(A)1：50　(B)1：100　(C)1：48　(D)1：96。
• 【題組】30. Tina, the little sister, wrote down what happened in her diary:Which activity/activities was
• 48.如圖所示之輪系，若A軸逆時針120rpm，則C軸轉速與轉向為 (A)40rpm，順時針　(B)360rpm，逆時針　(C)240rpm，順時針　(D)240rpm，逆時針。
• 47.三重滑車之輪系為(A)普通輪系　(B)周轉輪系　(C)單式輪系　(D)複式輪系。
• 6. 阿旺為了準備考試，整理以下表格，但有地方寫錯了，請幫忙指出哪一欄寫錯了？(A)(B)(C)(D)
• 33. Calculate the work for the expansion of CO2 from 1.0 to 2.5 liters against a pressure of 1.0 atm
• 34. Green light has a wavelength of 5.50 x 102nm. The energy of a photon of green light is:(A) 3.64
• 35. According to the Bohr model for the atom:(A) electrons are located in similar orbitals (B) elect
• 38. A polar covalent bond results from two atoms:(A) unequally sharing a pair of electrons (B) equal
• 32. Calculate the pH of 0.10 M NH4CN. (Kb for NH3 = 1.8 x 10-5; Ka for HCN = 6.2 x 10-10)(A) 9.23 (B
• 40. The entropy of the universe is always increasing. This is a statement of .(A) 1st law of thermod
• 42. For a reaction to be spontaneous, which of the following must be TRUE?(A) delta H must be negati
• 44. Which of the following is NOT a property of alcohols compared to alkenes?(A) exhibit hydrogen bo
• 47. An atom becomes an ion by:(A) gaining or losing protons (B) gaining or losing electrons(C) gaini
• 49. Which bond is the least polar? (Electronegativities: H = 2.2; N = 3.0; O = 3.5; P = 2.1; S = 2.
• 48. In order for the electron to return to the ground state, what must happen?(A) energy is absorbed
• 36. The maximum number of electrons that can occupy a 4d sub-shell is:(A) 4 (B) 6 (C) 8 (D) 10 (E) v
• 37. How many electrons are in a hydride ion if it has a charge of -1?(A) 0 (B) 1 (C) 2 (D) 3 (E) 1.5
• 51. Which one is WRONG for the safety in the laboratory?(A) Wear eye protection at all times.(B) In
• 50. For a double displacement reaction demonstration in class, a solution of potassium iodide and a
• 39. Which of the following molecules would you expect to be polar?(A) CO2 (B) CH4 (C) CH2Cl2 (D) H2
• 43. How many mL of 15 M HNO3 are needed to make 500 mL of a 2 M solution?(A) 0.015 (B) 0.03 (C) 33.3
• 41. The reaction of NaOH with a fat is referred to as:(A) esterification (B) dissociation (C) hydrol
• 53. Salt A and salt B were dissolved separately in 100 mL beakers of water. The water temperatures w