2018年5月IB物理(SL)真题PDF下载-Paper1
1.A student measures the radius r of a sphere with an absolute uncertainty Δr. What is thefractional uncertainty in the volume of the sphere?
A.(Δr/r)3
B. 3Δr/r
C. 4π(Δr/r)
D. 4π(Δr/r)3
2.A river flows north. A boat crosses the river so that it only moves in the direction east of itsstarting point.
What is the direction in which the boat must be steered?
3.An object is projected vertically upwards at time t = 0. Air resistance is negligible. The object passes the same point above its starting position at times 2s and 8s.If g = 10msè2, what is the initial speed of the object?
A.50
B.30
C.25
D.4
4.A uniform ladder resting in equilibrium on rough ground leans against a smooth wall.Which diagram correctly shows the forces acting on the ladder?
5. An object falls from rest from a height h close to the surface of the Moon. The Moon has no atmosphere.
When the object has fallen to height h/4 above the surface, what is (kinetic energy of the object at h/4)/(gravitational potential energy of the object at h)?
A.3/4
B.4/3
C.9/16
D.16/9
6.Child X throws a ball to child Y. The system consists of the ball, the children and the Earth.What is true for the system when the ball has been caught by Y?
A.The momentum of child Y is equal and opposite to the momentum of child X.
B.The speed of rotation of the Earth will have changed.
C.The ball has no net momentum while it is in the air.
D.The total momentum of the system has not changed.
7.An increasing force acts on a metal wire and the wire extends from an initial length l0 to anew length l. The graph shows the variation of force with length for the wire. The energyrequired to extend the wire from l0 to l is E.
The wire then contracts to half its original extension.
What is the work done by the wire as it contracts?
A.0.25E
B.0.50E
C.0.75E
D.E
8.The distances between successive positions of a moving car, measured at equal time intervals, are shown.
The car moves with
A.acceleration that increases linearly with time.
B.acceleration that increases non-linearly with time.
C.constant speed.
D.constant acceleration.
9.An object is moving in a straight line. A force F and a resistive force f act on the object along the straight line.
Both forces act for a time t.
What is the rate of change of momentum with time of the object during time t ?
A.F + f
B.F - f
C.(F + f ) t
D.(F - f ) t
10.A fixed mass of an ideal gas is trapped in a cylinder of constant volume and its temperature is varied. Which graph shows the variation of the pressure of the gas with temperature in degrees Celsius?
2018年5月IB物理(SL)真题余下省略！
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