2018年10月IB物理(SL)真题PDF下载-Paper1
1. What is the unit of power expressed in fundamental SI units?
A. kg ms–2
B. kg m2s–2
C. kg ms–3
D. kg m2s–3
2. The length of the side of a cube is 2.0 cm ± 4 %. The mass of the cube is 24.0 g ± 8 %. What is the ercentage uncertainty of the density of the cube?
A. ± 2 %
B. ± 8 %
C. ± 12 %
D. ± 20 %
3. A truck has an initial speed of 20 ms–1. It decelerates at 4.0 ms–2. What is the distance taken by the truck to stop?
A. 2.5 m
B. 5.0 m
C. 50 m
D. 100 m
4. A projectile is fired at an angle to the horizontal. Air resistance is negligible. The path of the projectile is shown.
Which gives the magnitude of the horizontal component and the magnitude of the vertical component of the velocity of the projectile between O and P?
5. A runner starts from rest and accelerates at a constant rate throughout a race. Which graph shows the variation of speed v of the runner with distance travelled s?
6. Two blocks X and Y rest on a frictionless horizontal surface as shown. A horizontal force is now applied to the larger block and the two blocks move together with the same speed and acceleration.
7. The mass at the end of a pendulum is made to move in a horizontal circle of radius r at constant speed. The magnitude of the net force on the mass is F.
What is the direction of F and the work done by F during half a revolution?
8. A compressed spring is used to launch an object along a horizontal frictionless surface. When the spring is compressed through a distance x and released, the object leaves the spring at speed v.What is the distance through which the spring must be compressed for the object to leave the spring at v/2?
A. x/4
B.X/2
C.X/√2
D.X√2
9. A ball of mass m collides with a wall and bounces back in a straight line. The ball loses 75 % of the initial energy during the collision. The speed before the collision is v.
What is the magnitude of the impulse on the ball by the wall?
A.(1-√3/2)mv
B. 1/2mv
C. 5/4mv
D. 3/2mv
10. A 700 W electric heater is used to heat 1 kg of water without energy losses. The specific heat capacity of water is 4.2 kJ kg–1 K–1. What is the time taken to heat the water from 25 °C to 95 °C?
A. 7 s
B. 30 s
C. 7 minutes
D. 420 minutes
2018年10月IB物理(SL)真题余下省略！
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