G9 Physics Multiple Choice

Which quantity can be measured directly using a micrometer screw gauge?

• the area of a sheet of paper

• the mass of a sheet of paper

• the thickness of a sheet of paper

• the volume of a sheet of paper

The velocity of an object increases from 30 m/s to 50 m/s in 5.0 seconds. What is the average acceleration of the object?

• 0.10 m/s²

• 0.25 m/s²

• 4.0 m/s²

• 10 m/s²

A heavy metal ball falls vertically downwards through air past four equally spaced levels J, K, L and M. The times taken to fall from one level to the next are measured. Where is the speed of the ball greatest and which time is shortest?

• speed is greatest between J and K, time is shortest between J and K

• speed is greatest between J and K, time is shortest between L and M

• speed is greatest between L and M, time is shortest between J and K

• speed is greatest between L and M, time is shortest between L and M

A body is moved from place X to place Y where the gravitational field strength is different. What happens to its mass and to its weight due to the move?

• mass changes, weight changes

• mass changes, weight stays the same

• mass stays the same, weight changes

• mass stays the same, weight stays the same

The diagrams show four solid blocks with their dimensions and masses. Which block has the greatest density?

• block A

• block B

• block C

• block D

A student wishes to determine the spring constant of a spring where it obeys Hooke’s law. Different loads are hung from the spring and its length is measured for each different load. The table shows the results of the experiment.

• 0.13 N/cm

• 0.14 N/cm

• 0.19 N/cm

• 0.25 N/cm

A mass of 20 kg is held stationary by a rope passing over a frictionless pulley. What is the tension T in the rope?

• 10 kg

• 20 kg

• 100 N

• 200 N

A boat starts moving across a river at velocity v perpendicular to the river bank. The boat encounters a current along the river of velocity u, as shown. Which vector diagram shows the resultant velocity r of the boat?

• (Diagram A)

• (Diagram B)

• (Diagram C)

• (Diagram D)

A ball of mass 0.50 kg falls and hits the floor at 10 m/s. It rebounds at speed 8.0 m/s. The collision between the ball and the floor lasts for 0.50 s. What is the average force acting on the ball during the collision?

• A 2.0 N upwards

• B 2.0 N downwards

• C 18 N upwards

• D 18 N downwards

An object falls from the top of a building that is 25 m high. Air resistance is negligible. What is the speed of the object when it hits the ground?

• 10 m/s

• 22 m/s

• 25 m/s

• 625 m/s