General science..............

1. Pyrometer: Instrument for measuring high temperature.
2. Rectifier: Device for converting AC into DC.
3. Transformer: Device for stepping up or stepping down AC voltage.
4. The weight of a body is maximum at the poles.
5. In a barometer, mercury is preferred over water because mercury 
has high density and low vapour pressure.
6. In cold countries alcohol is preferred' to mercury as a thermometric liquid because alcohol has a very low freezing point.
7. The boiling point of water depends on atmospheric pressure.
8. Infrared has the longest wavelength.
9. A lunar eclipse occurs when the earth comes between the sun  and the moon.
10. A solar eclipse occurs when the moon comes between the sun and the earth.
11. Concave mirror can be used to obtain the real image of on object.
12. A dentist's mirror is a concave mirror.
13. For the rear view, motorists use convex mirror.
14. The type of mirror used in the head lamps of cars is the parabolic concave mirror.
15. A rainbow is formed by the dispersion and total internal reflection of light by water droplets.
16. After a shower of rain, a rainbow is seen opposite the sun.
17. The accommodation of the eye is produced by the ciliary muscles.
18. To an astronaut, the outer space appears black.
19. Energy conversions in a loudspeaker are electrical to mechanical to sound.
20. Energy conversions taking place in microphone are sound to mechanical to electrical.
21. A transformer is a device for stepping up AC voltage.
22. The advantage of AC over DC is that it can be transmitted over long distances with minimum power loss.
23. The function of fuse in an electrical circuit is to break the circuit in case of overloading or short circuiting.
24. In an electrical circuit, a fuse is connected in the line wire.
25. The material used for a fuse wire should have low melting point.
26. Air is completely removed from an electric bulb to prevent oscillation of tungsten filament.
27. A common fluorescent tube contains mercury vapour of low pressure.
28. X-rays are produced when very high energy electrons ate stopped suddenly at a metal target.
29. Gamma radiation are used for sterilising foodstuff, controlling pests and cancer therapy. 
30. The age of earth can be estimated by uranium dating.
31. The function of a moderator in a nuclear reactor is to slow down the secondary neutrons.
32. A breeder reactor is that which produces more fissionable material than it burns.
33. The enormous energy released in an atomic explosion is due to the conversion of mass into energy.
34. The star nearest (other than SUN) to the earth is Proxima Centauri.
35. The nearest star, which is visible to the naked eye is Alpha Centauri.
36. Mercury and Venus do not have satellites revolving around them.
37. Saturn has the maximum number of satellites. 
38. An artificial satellite can be tracked very precisely from the earth by using Doppler effect.
39. The total number of stars in the universe is believed to be 10 twenty six.
40. The pole star is a part of the constellation Ursa Minor.
41. The ascending of wavelength is X-rays < ultraviolet < Microwave < Radio waves.
42. Planets & their Moons: Mars -Phobos; Saturn-Titan, Uranus-Miranda; Jupiter-Ganymede.
43. Among the moons of the planets, the largest is Ganymede of Jupiter.
44. A hydrogen-filled balloon rises only if its total weight is much less than the weight of air it displaces.
45. A barometer can be used for measuring atmospheric pressure determining altitudes and weather forecasting.
46. Fathometer-Depth of sea,
     Dasymeter-Density of a gas, 
     Monometer-Pressure of a gas, 
     Cryometer-Low temperature.
47. X-rays are electromagnetic waves.
48. Fathom: Unit of marine depth, 1 fathom = 6 feet.
49. Riboflavin is a vitamin.

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