31. The lowest temperature beyond which matter is not able to bec cooled is ____ degree Celcius: Minus 273

32. The mass of a body is 8kg on earth. What is its mass in moon: 8Kg

33. The minimum temperature at which a combustible
substance catches fire is called: Ignition temperature

34. The mirror used in search light is: Parabolic

35. The reagent used to test the presence of starch in
leaves is: Iodine solution

36. The type of glass which can cut off ultra violet rays:
Crookes glass

37. The unit of electric charge is: Coulomb

38. The unit of measuring distance between the stars is called: Light Year

39. The temperature below which the water vapor in a
volume of humid air at a constant barometric pressure
will condense into liquid water, is called: Dew
Point

40. Unit of illuminance and luminous emittance: Lux