QCE Physics external exam

2023, Paper 2

8 short-response questions, 44 marks, 90 minutes.

Formula and data book Original paper (PDF) Marking guide (PDF)

90:00

Nothing marked yet · paper out of 44

In the exam room: 10 minutes of perusal (reading, no writing), then 90 minutes of working time. Calculator and formula book allowed. The timer counts the working time.

Short response

Write your answers on paper, showing your working. Then open the official marking guide, compare, and give yourself the marks you earned.

QUESTION 1 (3 marks) Describe the effects of relativistic travel on an object.
QUESTION 2 (5 marks) In a frictionless system, object A rests on an inclined plane and object B undergoes horizontal circular motion. The two objects are connected by a length of string as shown. 7.0 kg 3.0 kg Not to scale 30° A B Glass tube Pulley 26 cm Determine the speed of object B needed for object A to remain stationary. Show your working. Speed = m s-1 (to two significant figures)
QUESTION 3 (8 marks) Three charges are in a straight line as shown. r 2r S +5.0 µC Net force on T = +2.8 N +5.0 µC +40 µC T U a) Calculate the electric field strength at T. Show your working. [2 marks] Electric field strength = N C-1 (to two significant figures) b) Determine the value of r. Show your working. [6 marks] r = m (to two significant figures)
QUESTION 4 (3 marks) Two objects on different planets experience different accelerations due to gravity. Object Mass (kg) Acceleration due to gravity (m s-2) A 79 1.6 B 32 3.7 Determine which object has the greatest force acting on it. Show your working.
QUESTION 5 (4 marks) Describe what happens when light is shone onto a metallic surface in the context of the photoelectric effect.
QUESTION 6 (10 marks) A ball is thrown with an initial velocity of 8.0 m s-1 into a bucket as shown. 1.8 m 3.0 m Not to scale 50° a) Calculate the time taken for the ball to reach its maximum height. Show your working. [4 marks] Time = s (to two significant figures) b) Calculate the magnitude of the ball’s final velocity when it enters the bucket. Show your working. [6 marks] Final velocity = m s-1 (to two significant figures)
QUESTION 7 (5 marks) Discuss the nature of light by describing evidence from two key experiments.
QUESTION 8 (6 marks) A length of wire, AB, is placed across an incomplete loop sitting within a magnetic field as shown. Wire AB then moves with a constant velocity of 40 m s-1, creating an induced EMF of 23 µV. 1.4 m Not to scale A B Direction of movement a) Determine the magnitude of the magnetic field strength experienced by the loop. Show your working. [4 marks] Magnetic field strength = T (to two significant figures) b) Draw a conclusion about the direction of the induced current within the loop. Justify your reasoning. [2 marks]