Ordinary level 2026 West harmonized regional mock physics 2
Ordinary level 2026 West harmonized regional mock physics 2
Section 1 (1 hour)
Answer all the questions
1. (a) Define semiconductor. (2 marks)
(b) State two things that can be done to increase the conductivity of a semiconductor. (2 marks)
2. Figure 1 shows a simple machine that can be used in lifting loads.
[Diagram of a pulley system with a 50 N effort and a 200 N load]
Figure 1
(a) State the name of the machine shown in figure 1. (1 mark)
(b) Calculate the mechanical advantage of the machine. (3 marks)
(c) State one reason why the efficiency of the machine is not 100%. (1 mark)
3. (a) A transformer has 1000 turns in the primary coil and 3000 turns in the secondary coil.
(i) Calculate the secondary voltage if the primary voltage is 250 V. (3 marks)
(ii) State two sources of energy lost in a transformer. (2 marks)
(b) Figure 2 shows a bar magnet, held near a coil to which a galvanometer, G, has been connected.
[Diagram of a bar magnet moving toward a coil connected to a galvanometer]
Figure 2
(i) State and explain what is observed when the magnet is moved towards the coil. (3 marks)
(ii) State two things that can be done to increase the observation. (2 marks)
4. The nuclide $^{14}_{6}C$ has a half-life of 5600 years and decays to the nuclide $^{14}_{7}N$.
(a) Define half-life. (2 marks)
(b) Determine the time it will take for the number of undecayed nuclides to reduce to 1/4 the original value. (2 marks)
(c) State the kind of decay undergone by the C-14. Justify your answer. (2 marks)
(d) State and explain how the rate of decay will be affected if the sample is heated to a higher temperature. (2 marks)
5. An object is placed between the principal focus and optical centre of a concave lens.
(a) State the nature of the image formed. (1 mark)
(b) Draw a ray diagram to show how the image is formed. (2 marks)
(c) State one similarity between the image formed and that formed in a plane mirror. (1 mark)
