選擇題在IB物理考試占有重要地位，特別是在IB物理大考中，整個Paper 1的題目都是選擇題。2023年5月IB考試在即，如何有效提升IB物理選擇題的得分率？今天留求藝留學為大家總結了IB物理HL Paper1真題示例及答題注意事項，希望對大家有幫助。

IB物理HL Paper1真題示例

1.) When a skydiver opens her parachute, she is falling with terminal velocity. What is the direction of the velocity and acceleration vector before she reaches the new terminal speed?

A.) Velocity: Upwards, Acceleration: Upwards
B.) Velocity: Upwards, Acceleration: Downwards
C.) Velocity: Downwards, Acceleration: Upwards
D.) Velocity: Downwards, Acceleration: Downwards

Answer: C
Since the skydiver has opened their parachute, the motion of the skydiver is now slow and downwards. When an object slows down, its acceleration is always opposite to the direction of its motion. Since the diver is moving down, the direction and magnitude of the velocity vector is downwards. Since her speed is decreasing, the?acceleration vector must point opposite to the velocity vector.

2.) A sports car is accelerated from 0 to 120 km per hour in 4 s. What is the acceleration of the car?

A.) 0.9 g
B.) 0.4 g
C.) 0.3 g
D.) 4 g

Answer: A
120 km/h needs to be converted to m/s first since the time is given in seconds. Therefore,
120 km/hr * (1000 m)/(1 km) * (60 min)/(1 hr) * (60 sec)/(1 min) = 33.333 m/s.
Acceleration is change in velocity/change in time, therefore:
(33.333 m/s – 0 m/s) /4 = 8.33325 m/s2
As the answer is given in g’s, we will divide the acceleration by g. 1 g = 9.8 m/s2. Therefore,
8.33325/9.8 = 0.8503 g’s which is approximately,?0.9 g’s

3.) In a flask, energy is transmitted to the water at a rate P. When the water approaches its boiling point, P is raised. What modifications have been made to the water’s temperature and rate of evaporation since the change?

A.) Temperature increases, Rate of Evaporation increases
B.) Temperature increases, Rate of Evaporation stays the same
C.) Temperature stays the same, Rate of Evaporation increases
D.) Temperature stays the same, Rate of Evaporation stays the same

Answer: C
There is no change in temperature after it reaches boiling point no matter how much the water is heated. However, the rate at which the energy is transmitted increases, therefore, the rate of evaporation also increases.

4.) Which of the follow statements are true about total internal energy and total intermolecular potential energy of a solid substance when it undergoes sublimation to become a gas?

A.) Internal energy increases, intermolecular potential energy stays the same
B.) Internal energy increases, intermolecular potential energy increases
C.) Internal energy stays the same, intermolecular potential energy stays the same
D.) Internal energy stays the same, intermolecular potential energy increases

Answer: B
The intermolecular potential energy increases because potential energy of any matter depends upon inter molecular space and gases have highest inter molecular space. Furthermore, if the potential energy increases, the internal energy is also bound to increase since the internal energy is the sum of the kinetic and potential energy.

5.) There is a flow of charge through a liquid. 0.15 C of negative ions and 0.15 C of positive ions move facing each other. What is the magnitude of the electric current flowing through the liquid?

A.) 0.075
B.) 0
C.) 0.15
D.) 0.3

Answer: D
Since the charged ions have separate magnitudes and are facing each other, the electric current flowing through the liquid is the sum of both charges. This was because they are oppositely charged ions.

IB物理HL Paper1答題技巧

Paper1中50%的題目需要寫明多個步驟，Paper1的題目難度偏大。大家要做好心理準備。這也是IB小伙伴們從現(xiàn)在開始就需要練習的內容。IB物理Paper1不像 GCSE課程或互聯(lián)網上的小測驗那么簡單。這些選擇題要求大家解決實際問題，對大家的基礎知識的理解程度要求比較高。

如何提升IB物理選擇題的得分率？

◆ 復習時優(yōu)先考慮上述列出的物理Topic；

◆ 多做練習，按主題練習對應的選擇題；

◆ 使用計時器將每個問題的答題時間限制在1.5分鐘內；

◆ 練習經常出現(xiàn)的“比率”問題。

◆ Paper1的出題順序是按照教學大綱的順序排列的，這意味著在試卷最后會有簡單的題目出現(xiàn)。因此在考試的時候，大家首先完成Paper中簡單的題目。跳過太難的題目，最大化得分。

◆ 做選擇題時，首先排除所有不正確的選項。

◆ 如果遇到圖表題，需要重點關注漸變、圖表下方的區(qū)域和單位。

◆ 有時，遇到無法明確答案的題目也不要太灰心，繼續(xù)做題，畢竟你有超過 25% 的機會做對！

◆ 切勿留下任何空白。能做的題目盡量做上，實在做不出來就猜，萬一猜對了就可以得分。

2023年5月考試愈近，現(xiàn)在正是IBDP2學生忙于復習備考的關鍵階段！復習備考，多做IB歷年真題很有必要！留求藝留學為大家準備了IB歷年真題/筆記資料包，速來咨詢領取~

【微語】愿你留學的道路一帆風順，充滿快樂與收獲，前程似錦，未來可期！