7. The figure 3 below (drawn to scale) shows a lens L1 placed 30 cm from an object O. The image is formed on the screen S, 50 cm from the lens. On the same figure draw the appropriate rays to determine the focal length of the lens. (3 marks) Figure 3 8. State why mains electricity for long distances is transmitted at high voltages. (1 mark) ……………………………………………………………………………………………………………………….. 9. A student wishes to use a 5.5 resistor into a circuit but has only 2 resistors. She uses a combination of eight 2 resistors. Draw a circuit diagram to show how she would arrange them. (2 marks) 10. The circuits in Figure 4(a) and 4(b) below show short circuits. In both the fuse has blown. Whereas (a) is now safe (b) is still dangerous even though the lamp is out. Explain (2 marks) 11. State three properties of cathode rays. (3marks) 12. State one application of total internal reflection. (1mark) ……………………………………………………………………………………………………………………….…………. SECTION B (55 MARKS) Answer ALL questions in this section 13.(a) An angle of reflection of a reflected ray from a plane mirror is 200. If the mirror is rotated through an angle of 250 , calculate the angle between the incident ray and the new reflected ray. (2 marks)
7. The figure 3 below (drawn to scale) shows a lens L1 placed 30 cm from an object O. The image is formed on the screen S, 50 cm from the lens. On the same figure draw the appropriate rays to determine the focal length of the lens. (3 marks) Figure 3 8. State why mains electricity for long distances is transmitted at high voltages. (1 mark) ……………………………………………………………………………………………………………………….. 9. A student wishes to use a 5.5 resistor into a circuit but has only 2 resistors. She uses a combination of eight 2 resistors. Draw a circuit diagram to show how she would arrange them. (2 marks) 10. The circuits in Figure 4(a) and 4(b) below show short circuits. In both the fuse has blown. Whereas (a) is now safe (b) is still dangerous even though the lamp is out. Explain (2 marks) 11. State three properties of cathode rays. (3marks) 12. State one application of total internal reflection. (1mark) ……………………………………………………………………………………………………………………….…………. SECTION B (55 MARKS) Answer ALL questions in this section 13.(a) An angle of reflection of a reflected ray from a plane mirror is 200. If the mirror is rotated through an angle of 250 , calculate the angle between the incident ray and the new reflected ray. (2 marks)
PHYS-P2.docx