21. A moderator is
used in nuclear reactor in order to Slow down the speed of the neutrons.
22. Sedimentary rocks
are Porous.
23. Gypsum is
a non-metallic mineral.
24. Ultraviolet
radiation are prevented by Ozone layer from entering into atmosphere.
25. The phenomenon of
Aurora Borealis, the display of red and green lights in northern hemisphere is
due to radiations from Ionosphere.
26. Yeast is used in
making bread because it produces Carbon dioxide.
27. Oasis is
associated with Desert.
28. Quartz crystal in
quartz watches work on the principle called Piezo-electric effect.
29. The fruits
without seed, like banana, are called parthenocarpic fruits.
30. Animal which
captures and readily kills living animals for its food is called Predator.
31. In a railway
track, two rails are joined end to end with a gap tin between them because
Accidents due to expansion in summer can be avoided.
32. The famous book;
Al-Qanoon was written by the Muslim scientist Abu Ali Sina
33. In the famous
book Al-Qanoon, human physiology and medicine is discussed.
34. Water is heated
in a kettle. The inside water is heated by convection. A person sitting near
the fire receives heat by Convection.
35. Light year is a
unit of Atmospheric Distance.
36. Three elements
needed for the healthy growth of plants are N,P,K.
37. By Artificial
Radioactivity Copper can be converted into gold.
38. In winter an iron
pipe feel colder than a wooden window this is because wood is non-Conductor.
39. It is possible to
recognize a person in the dark by simply hearing his unique voice; it is
because of the Time period.
40. When a ray of
sunlight enters a dark room, its straight path become visible because of dust
particles hanging in the air. It is because light is Visible.
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