2012年5月IB物理(SL)真题PDF下载-paper1
1. What is the order of magnitude of the mass, in kg, of an apple?
A. 10–3
B. 10–1
C. 10+1
D. 10+3
2. The diagram below shows the forces acting on a block of weight W as it slides down a slope. The angle between the slope and the horizontal is θ, the normal reaction force on the block from the slope is N and friction is negligible.
Which of the following gives the resultant force on the block?
A. W sin θ
B. W cos θ
C. N sin θ
D. N cos θ
3. The velocity–time graph for an accelerating object that is travelling in a straight line is shown below.
Which of the following is the change in displacement of the object in the first 5.0 seconds?
A. 25.0 m
B. 12.5 m
C. 5.0 m
D. 1.0 m
4. An object falls vertically from rest. Air resistance acts on the object and it reaches a terminal speed. Which of the following is the distance–time graph for its motion?
5. A pendulum swings back and forth in a circular arc between X and Y.
The pendulum bob is
A. always in equilibrium.
B. only in equilibrium at X and Y.
C. in equilibrium as it passes through the central position.
D. never in equilibrium.
6. A block of mass m is moving at constant velocity v along a frictionless surface that is height h above the ground.
Which expression gives the work necessary to maintain the constant velocity?
A. mgh
B. 1/2mv2
C. mgh+1/2mv2
D. zero
7. Which of the following is an elastic collision?
A. Two railway trucks collide and they link together.
B. Two railway trucks collide and they do not link together.
C. Two gas molecules collide and each changes direction.
D. Two gas molecules collide and a bond is formed between them.
8. A car moves at constant speed around a horizontal circular track. The resultant force on the car is always equal to
A. the forward force from the engine.
B. the sideways friction between the tyres and the track.
C. the weight of the car.
D. zero.
9. The total potential energy and random kinetic energy of the molecules of an object is equal to the
A. heat energy in the object.
B. internal energy of the object.
C. thermal energy in the object.
D. work stored in the object.
10. Which of the following correctly distinguishes between the evaporation and the boiling of a liquid under atmospheric pressure?
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