50. Which combination of color is the convenient during day and night time ?
A.Low temperature and high pressure
B.High temperature and low pressure
C.Low temperature and low pressure
D.High temperature and high pressure

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51. The instrument that measures and records the relative humidity of air?
A.Hydrometer
B.Hygrometer
C.Lactometer
D.Barometer

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52. The shape f our Milky Way galaxy is?
A.Circular
B.elliptical
C.spiral
D.None of these above

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53. The different colors of different stars endue to the variation of?
A.Temperature
B.Pressure
C.density
D.radiation

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54. The fundamental scientific principle in the operation of battery is?
A.acid-base infraction
B.Dialysis
C.dissociation electrolytes
D.oxidation-reduction

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55. Instrument used to measure the force and velocity of the wind is?
A.Ammeter
B.Manometer
C.Altimeter
D.kudiometer

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56. Woolen clothes keeps the body warm because?
A.Wool increases the temperature of the body
B.Wool is a bad conductor
C.Wool absorbs radiant heat from outer object
D.Wool rejects head from the outer objects

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