2019年11月IB物理(SL)真题PDF下载-Paper1
1. Which quantity has the fundamental SI units of kg m–1 s–2?
A. Energy
B. Force
C. Momentum
D. Pressure
2. An object is held in equilibrium by three forces of magnitude F , G and H that act at a point in the same plane.
Three equations for these forces are
I. F cos θ = G
II. F = G cos θ + H sin θ
III. F = G + H
Which equations are correct?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
3.Two forces act along a straight line on an object that is initially at rest. One force is constant; the second force is in the opposite direction and proportional to the velocity of the object.
What is correct about the motion of the object?
A.The acceleration increases from zero to a maximum.
B.The acceleration increases from zero to a maximum and then decreases.
C.The velocity increases from zero to a maximum.
D.The velocity increases from zero to a maximum and then decreases.
4.The variation with time t of the acceleration a of an object is shown.
What is the change in velocity of the object from t = 0 to t = 6 s?
A.6 m s–1
B.8 m s–1
C.10 m s–1
D.14 m s–1
5.A climber of mass m slides down a vertical rope with an average acceleration a. What is the average frictional force exerted by the rope on the climber?
A.mg
B.m (g + a)
C.m (g - a)
D.ma
6.A cube slides down the surface of a ramp at a constant velocity. What is the magnitude of the frictional force that acts on the cube due to the surface?
A.The weight of the cube
B.The component of weight of the cube parallel to the plane
C.The component of weight of the cube perpendicular to the plane
D.The component of the normal reaction at the surface parallel to the plane
7.A ball is thrown vertically upwards. Air resistance is negligible. What is the variation with time t of the kinetic energy Ek of the ball?
8.The tension in a horizontal spring is directly proportional to the extension of the spring. The energy stored in the spring at extension x is E. What is the work done by the spring when its extension changes from x to x/4?
A.E/16
B.E/4
C.3E/4
D.15E/16
9. A mass m of water is at a temperature of 290 K. The specific heat capacity of water is c . Ice, at its melting point, is added to the water to reduce the water temperature to the freezing point. The specific latent heat of fusion for ice is L . What is the minimum mass of ice that is required?
A.17mc/L
B.290mc/L
C.17mL/c
D.290mL/c
10. An ideal gas is in a closed container. Which changes to its volume and temperature when taken together must cause a decrease in the gas pressure?
2019年11月IB物理(SL)真题余下省略！
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