امتحان الاسكندريه 2011
1-complete the following statments:
1- the nut*****er is an example of the ..... calss lever, while scissors is an example of the ..... calss lever
2-when the light bulbs is connected in ....., light intensity of the bulbs decrease with increasing in their number
3- when the moon in an orbit higher from earth so,..... solar eclipse is formed
4-some levers allow conservation of the.... by means of using small force to move heavy loads, like in crowbar.
5- the glass bulb in ( the light bulb) prevent ... from reaching the filament, thus protects it from burning.
6- we can see ... when the sun is behind the horizon at night, where as ....always occurs in the morning
b--- define
the selective permeability
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1- correct underlined words
1- in the semi shaded area of moon, we can see a part of sun forming total solar eclipse
2- the plant loses water in the shape of water vapour in photosynthesis process
3- the phenomenon of lunar eclipse occures in the end of the lunar month
4- in second class levers, fulcrum is between force and resistance, while in the first class levers resistance is between force and fulcrum
2- give reason
1- the filament of electris lamp made of tungesten
2- the root hair are of thin walls
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1- choose:
1- it occures when the moon comes between earth and sun on one straight line
( totall lunar eclipse- solar eclipse- partiall lunar eclipse)
2- some of levers allow increase in speed of objects we inflict on as in ( tweezers-hockey bat-scissors)
3- stomata are widly spread on ( stem- upper suracfe of leaf-lower surface of leaf)
4- all of the following are types of lunar eclipse except
( annular lunar eclipse- totall lunar eclipse- partial lunar eclipse)
5- most popular type of levers in our daily life are
( first class lever- second class lever- third class lever)
2--- in the figure there are 2 electoric circuits A& B
رسمتين لدائرتين توصبل توالى وتوازى
1- mention the way which light bulbs connected in each circuit A& B
2- which of the ways could be used to connect electric lamps in the house?
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1- scintfic term:
1- it's rigid bar that rotates around fixed point called fulcrum and affected by force and resistance
2- the two astronomical phenomenon which result in hiding of all or part of the sun and the moon
3- an inert gas is found in the glass bulb of an electric lamp
4- two cells surround the leaf stoma
2- what happened in the following cases
1- when an electric lamp which is connected in series with others burns
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