6 October directorate
Time 2 hours
science orientation
Subject science
1st term 2018-2019
1st prep
Question1:(A) complete the following :
1-in simple cell …………………energy change into ………………….energy
2- ice has ……………melting point while iron has ……………….melting point
3- sloth belongs to …………………….while …………………belongs to lagomorphs
4- liquid monoatomic elements is …………………..while liquid diatomic element is…………………..
5- symbol of sulphur is ………………..while symbol of silver is ……………………
(B) cross the odd word out and write the scientific of the rest :
1- locust –mosquito –spider -fly
2-oxygen -water -nitrogen -hydrogen
3-light -heat –food -sound
4-cork – wood – oil - cooper
Q2: (A) apiece of iron of mass 78gm is put in cylinder has 50cm3 of water the water rises
to 60cm3 find the density of iron
(b)write the scientific term.
1- the number of positive protons in the nucleus of an atom
2-the plants that can't distinguish into roots stem and leaves
3- smallest particle of matter can share in chemical reaction
4- anything that have a mass and volume
5- method of transferring heat in gases and liquids
(c): what is meant by :
1- excited atom
2- boiling point
Q3: write the electronic configuration of the following :
9F
12Mg
20Ca
2He
)b( Choose the correct answer :
1-all the following solution are good conductor of the electricity except
(acidic- alkaline- sugary- salt)
2-animal hasn't body support (fish – snail – octopus – bird )
3- from elements that difficult to react with oxygen
(sodium- potassium – gold- iron )
4- celebrating balloon filled with (oxygen – helium – chlorine – fluorine )
5- cycas plants belongs to ( algae – gymnosperms – ferns – dicotyledons )
6- permanent and main sources of other energies (sun – wind – fuel – food )
(c) write one difference :
1- element and compound
2- hibernation – aestivation
Q4: give reason for :
1-atom is electricity neutral at ordinary state
2- cooking pans are made of aluminum
3-some birds migrate in water
4- freezer is put at the top of fridge
(b) find the weight of object its potential energy = 100joules at height= 20 meter
(c) what happen when :
1- petrol fires put off by water
2- rubbing your hands together
3- expos to car exhausts
4-adding 100 cm3 of water to 50cm3 of alcohol
Model answer
1-chemical - electric
(2)
2-low – high
(2)
3- edentates – rabbit
4- mercury – bromine
(2)
(2)
(B) 1-Spider (insects)
(2)
2-water (elements or gases)
( 2)
3- food (forms of energy )
( 2)
4- copper (float on water or low density)
Q2 (A)volume =60-50=10cm3
(2)
, density=mass ÷ volume=78 ÷ 10=7.8 gm/cm3
(b)1-atomic number 2-algae 3- atom 4- matter
(c)1- atom that gain a quantum of energy
5-convection
(2)
( 2 for each)
(1)
2-the temperature at which the substance begin to change from liquid state to gaseous
state (1)
Q3: (A)1- 9Fe(2-7)
2-12Mg(2-8-2)
(b)1- sugary 2- octopus
3- gold
3-20Ca(2-8-8-2)
4-2He(2)
4- helium 5-gymnosperms
(c)elements (similar atoms )
compound (different atoms)
2-overcome low temperature
overcome high temperature
(14)
6-san
Q4: (a) 1- bec. Number of positive protons= number of negative elements (2 for each )
2-bec. Aluminum good conductor of heat
3-for reproduction
4- bec. Cold air has high density and fall down and is replaced by hot air and so on
(b)weight = potential energy ÷ height =100 ÷ 20 =5 N
(c) 1- fire will increases 2- generate heat energy
4- the total volume less than 150 cm3
(2)
3-causes eye and chest disease
(1 for each)