6. Choose the correct statement concerning electric fields :
(A) lines of may cross
(B) an electric dipole never experiences a torque due to
(C) an electric dipole experiences a net force due to a uniformfield
(D) a point charge q, released from rest, will move along a line of field
(E) none of these

1. A block of mass M is pushed up an incline of slope 3/4 by a horizontal force equal to twice its weight. If the coefficient of kinetic friction between the block and the incline is u = 0.25, what is the acceleration of the block along the incline? (A) g/5 (B) g/2 (C) 3g/4 (D) 4g/5 (E) g

2. The diagram represents a mass on a spring scale in an elevator. If the reading on the spring scale is 0.75 of the value when at rest, what is the acceleration of the elevator? (In units of g.) (A) 1.25 up (B) 0.75 up (C) 0.25 up (D) 0.25 down (E) 0.75 down

3. Young's modulus is a proportionality constant that relates the force per unit area applied perpendicularly at the surface end of an object to: (A) the shear (B) the fractional change in volume (C) the fractional change in length (D) the pressure (E) the spring constant

4. A small satellite is in elliptical orbit around the earth as shown. If L denotes angular momentum and K denotes kinetic energy, which of the following statement is correct? (A) LB ＞ LA and KB ＞ KA (B) LB ＞ LA and KB = KA (C) LB = LA and KB = К(D) LB＜ LA and KB = KA (E) LB = LA and KB ＞ КA 

5. The "Principle of Equipartition of Energy" states that the energy of a gas is shared equally: (A) among the molecules (B) between kinetic and potential energy (C) among the relevant degrees of freedom (D) between translational and vibrational kinetic energy (E) between heat and work

7. An initially uncharged capacitor C is connected in series with resistor R. This combination is then connected to a battery of emf V0. Sufficient time elapses so that a steady state is reached. Which of the following statements is NOT true? (A) the time constant is independent of V0 (B) the final charge on C is independent of R (C) the total energy dissipated by R is independent of R (D) the total energy dissipated by R is independent of Vo (E) the initial current (just after the battery was connected) is independent of C

20.下列量子物理的概念,何者正確?(A)無限深的位能阱,寬度變楚大;(B)在量子的世界裡一個初速度沒有快到可以翻越方形路障的彈珠,仍有機率穿過這個窄窄的路障(barrier);(C)同( B ),在量子的王某個特別的初速度,有較大的穿越路障的機率。甚至,比道一點的速度,穿越的機率反而降低;(D)在量子的世界裡,碗裡無法跑出碗外的一模一樣彈珠,一個彈彈珠有機會因為另一個彈因此同時跑出碗外,中間沒有任何能量的介入;(E)在量子,有液體可以無視重力,自動往高處流動,中間沒有任何能量

19.設有一群電子,被10kV的高壓電位加速,打到一個靶材,而造成的X-光,所得最短長λminin 被用來入射另一個內有自由電子的靶波長改變了4.852x10-12公尺。下列何者正確(A)λmin 為 0.124 nm ;(B)λmin為0.0124nm;(C)第二個靶材,原先静止的電子會獲得6.3x10-12焦耳能量(D)第二個靶材,原先靜止的電子會獲得6.3x10-17焦耳能量(E)若入射X-光與散射的X-光夾角為零,則散射的X-光波長不變  

18.每莫耳CO有28公克。今於室温(270C)有一大氣壓CO分子,平均自由徑6.45×10-8公尺。下述何者對一氧化碳的物理狀況的敘述是正確的(A)CO密度2.45x1025molecules/m3(B)均方根速度52m/s;(C)均方根速度517m/s;(D)CO分子碰撞頻率7.9x109s-1;(E)CO分子碰撞頻率7.9×1011s-1

17.有關近代物理角動量量子化的實驗,以下描述何者正確?(A)設電子電荷量為e,v為切線速度,則電子繞氫原子核的磁偶極矩(magnetic dipole)為qvr (B)從磁偶極矩與角動量的定義,我們可推得二者的關係為;(C)加均匀磁場,可以使不同角動量的原子在空間中分裂出來;(D)總角動量是零的原子經過 Stan-Gerlac 實驗中的磁場,仍可看到原子的分布份,那是電子自旋角動量(spin)造成:(E)Stan-Gerlac 實驗中的磁場是為了觀察Zeeman 效應。    

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