12 PHYSICS QLD EA MC 2020

Which of the diagrams correctly represents the forces acting on an object resting on an inclined plane?

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• 

The definition of average speed is the rate of change of

• velocity

• distance

• acceleration

• displacement

The diagram shows two vectors.

Calculate the magnitude of the resultant vector when Vector A is added to Vector B.

• 15 km

• 16.5 km

• 21 km

• 108 km

The diagram shows a current-carrying loop moving from one magnetic field to another magnetic field in 0.600 seconds.

Calculate the magnitude of the EMF produced in the current-carrying loop.

• 1.26 × 10^-6 V

• 1.26 × 10^-5 V

• 1.26 × 10^-1 V

• 1.26 × 10² V

Which of the following is Lenz’s Law?

• The total electric charge of an isolated system remains constant regardless of changes within the system.

• The magnetic flux around a current-carrying wire changes in proportion to the rate of change of the current.

• The direction of an induced electric current always opposes the change in the circuit or magnetic field that produces it.

• The ratio of the sines of the angles of incidence and refraction of a wave is constant when the wave passes between two given media.

The definition of relativistic momentum is the

• momentum of an object when measured in a Newtonian frame of reference.

• momentum of an object when measured regardless of its frame of reference.

• momentum of an object when measured in the frame of reference in which the object is in motion.

• momentum of an object when measured in the frame of reference in which the object is stationary.

A quantum of any form of electromagnetic radiation is also known as

• a photon.

• an X-ray.

• a positron.

• an electron.

An object 46 m above the ground is projected horizontally, with an initial velocity of 25 ms^-1. Calculate the horizontal displacement of the object at the time it reaches the ground.

• 77m

• 120m

• 190m

• 240m

Select the list containing the six types of quarks.

• in, out, up, down, top and bottom

• right, left, charm, strange, in and out

• up, down, charm, strange, top and bottom

• charm, strange, right, left, top and bottom

The force that quarks experience that leptons do not is the

• weak force.

• strong force.

• normal force.

• electromagnetic force.