IB Physics Practice Exam HL Q01-Q10

A boy jumps from a wall 3m high. What is an estimate of the change in momentum of the boy when he lands without rebounding?

• 5 x 10⁰ kg m s^-1

• 5 x 10¹ kg m s^-1

• 5 x 10² kg m s^-1

• 5 x 10³ kg m s^-1

A car moves north at a constant speed of 3 m s^-1 for 20 s and then east at a constant speed of 4 m s^-1 for 20 s. What is the average speed of the car during this motion?

• 7.0 m s^-1

• 5.0 m s^-1

• 3.5 m s^-1

• 2.5 m s^-1

A student draws a graph to show the variation with time t of the acceleration a of an object. What can the student deduce from this graph only, and what quantity from the graph is used to make this deduction?

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• $g\sin\theta$

• $g\cos\theta$

• $g\tan\theta$

• $\frac{g}{\tan\theta}$

An object, initially at rest, is accelerated by a constant force. Which graphs show the variation with time t of the kinetic energy and the variation with time t of the speed of the object?

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Two stationary objects of mass 1 kg and 2 kg are connected by a thread and suspended from a spring. The thread is cut. Immediately after the cut, what are the magnitudes of the accelerations of the objects in terms of the acceleration due to gravity g?

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An object of mass 2 kg is thrown vertically downwards with an initial kinetic energy of 100 J. What is the distance fallen by the object at the instant when its kinetic energy has doubled?

• 2.5 m

• 5.0 m

• 10 m

• 14 m

A student of weight 600 N climbs a vertical ladder 6.0 m tall in a time of 8.0 s. What is the power developed by the student against gravity?

• 22 W

• 45 W

• 220 W

• 450 W

Energy is supplied at a constant rate to a fixed mass of a material. The material begins as a solid. The graph shows the variation of the temperature of the material with time. The specific heat capacities of the solid, liquid and gaseous forms of the material are c_s c_l and c_g respectively. What can be deduced about the values of c_s c_l and c_g?

• c_s > c_g > c_l

• c_l > c_s > c_g

• c_l > c_g > c_s

• c_g > c_s > c_l

The pressure of a fixed mass of an ideal gas in a container is decreased at constant temperature. For the molecules of the gas there will be a decrease in

• the mean square speed.

• the number striking the container walls every second.

• the force between them.

• their diameter.