31. Which of these is true of all simple machines?
32. Which of these is not a simple machine?
33. The plastic material commonly used for making gear wheels is
34. The reason for a swimming pool to appear less deep than the actual depth is
35. When light passes from one medium to another, this phenomenon of change in its direction is called ________
36. Optical fibre works on which of the following principle of light?
37. Which colour of light shows maximum deviation when passed through a prism ?
38. The sparkling of a diamond is due to
39. Stars appear twinkling because of ......... of light.
40. Stars in the sky appear to twinkle due to
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