2015年11月IB物理(SL)真题PDF下载-Paper1
1. Which of the following is a derived unit?
A. Mole
B. Kelvin
C. Coulomb
D. Ampere
2. One kilogram of ice of density 1000 kgm–3 is frozen in the shape of a cube. The diameter of a water molecule is 10–10m. What is the difference in the orders of magnitude of the length of one side of the ice cube and the diameter of a water molecule?
A. 7
B. 9
C. 11
D. 13
3. An object is at rest at time t = 0. The variation with t of the acceleration a of the object is shown from t=0 to t=20s.
What is the speed of the object when t=15s?
A. 25ms–1
B. 50ms–1
C. 75ms–1
D. 100ms–1
4. Which of the following is proportional to the net external force acting on a body?
A. Speed
B. Velocity
C. Rate of change of speed
D. Rate of change of velocity
5. A small positively charged sphere is suspended from a thread and placed close to a negatively charged rod. When the thread is at 45° to the vertical the system is in equilibrium.The weight of the sphere is W and the magnitude of the electrostatic force between the rod and the sphere is F.
What is the magnitude of W compared with the magnitude of F ?
A. W=√2F
B. F<W<√2F
C. W=F
D. W > F
6. An object of mass m is initially at rest. When an impulse I acts on the object its final kinetic energy is EK. What is the final kinetic energy when an impulse of 2I acts on an object of mass 2m initially at rest?
A.EK/2
B. EK
C. 2EK
D. 4EK
7. A heat engine does 300 J of work during one cycle. In this cycle 900 J of energy is wasted.What is the efficiency of the engine?
A. 0.25
B. 0.33
C. 0.50
D. 0.75
8. A container holds 40g of argon-40 (4018Ar) and 8g of helium-4(42He).What is the (number of atoms of argon/number of atoms of helium)in the container?
A. 1/2
B. 2/9
C. 2/1
D. 9/2
9. The thermal capacity of a body is the energy required to change the temperature of the body by
A. 1 K.
B. 1 K m3.
C. 1 K kg–1.
D. 1 K s–1.
10. When 1800 J of energy is supplied to a mass m of liquid in a container, the temperature of the liquid and the container changes by 10 K. When the mass of the liquid is doubled to 2m,3000 J of energy is required to change the temperature of the liquid and container by 10 K.What is the specific heat capacity of the liquid in J kg–1K–1?
A. 60/m
B. 120/m
C. 180/m
D. 240/m
2015年11月IB物理(SL)真题余下省略！
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