21. Rainbow formation is a natural phenomenon illustrating that white light
- A. splits into three components after rainfall
- B. is dispersed by glass prisms
- C. splits into its constituent colours before rainfall
- D. is dispersed into its constituent colours after rainfall
22. 
The lens illustrated above can best be described as a
- A. converging meniscus
- B. plano-convex
- C. diverging meniscus
- D. bi-convex
23. Two plane mirrors are inclined to each other such that an object placed between them has 11 images. Determine the angle of inclination
- A. 30°
- B. 45°
- C. 60°
- D. 90°
24. The pitch of a note is not affected by
- A. frequency
- B. tension in a vibrating string
- C. mass of a vibrating string
- D. amplitude of sound wave
25. When two flat plate conductors are arranged in such a way that they possess equal and opposite charges seperated by a dielectric, they form a/an
- A. electroscope
- B. electrophorus
- C. capacitor
- D. cell
26.
Which electrical device is illustrated above?
- A. a.c. generator
- B. a.c. motor
- C. d.c. generator
- D. d.c. motor
27. A simple barometer is constructed using a liquid Q1 of density 16.2g/cm³. Calculate the least lenth of the tube to be used to measure pressure of 1.5atm. [Density of mercury = 13.6g/cm³, 1atm = 76.0 cm of Mercury]
- A. 1358mm
- B. 957mm
- C. 760mm
- D. 638mm
28. 
The diagram above illustrates the mercury-in-glass thermometer used for determining the temperature of a room. Use the data on it to determine the room temperature.
- A. 3.3°C
- B. 7.0°C
- C. 13°C
- D. 30.0°C
29. To obtain a virtual, erect and magnified image from a thin converging lens, an object must be placed
- A. between the focus and the lens
- B. at the focus
- C. between the focal length and twice the focal length
- D. beyond twice the focal length
30. 
The diagram above represents a transverse travelling wave. Which two points are 180° out of phase?
- A. A and E
- B. B and D
- C. C and F
- D. D and H
