science preparatory 3 final revision

1)Write the scientific term:

1-The moved through a unite time

2-The combination of male gamete and female gamete to from zygote

3-The space which contains all the galaxies stars planets and living organisms

4-The regular <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> by which the object moves to cover equal distance at the same period of time

5- an optical piece  is thin at its center and more thick at the tips and diverging light rays falling on it.

6-Asexual reproduction takes place in some plants without seeds

7-A group of stars that rotate together in cosmic space by the effect of gravity

8-The angle between the reflected light ray and the normal line at the point of incidence on the reflecting surface

9- Fusion of the male gamete and the female gamete to form the zygote

10-The <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> of an object relative to an observer

11-The force that controls the orbits of the planets around the sun according to the modern theory

12-specilaized cells which produce gametes

13-changing in  the position of an object as time passes according to a fixed point

14-A point inside the lens that lies on the principle axis at mid distance between the faces of the lens

15-Some theing that includes all galaxies , stars , planets and living organisms

16-The rebounding of the light to the same side when it strikes a reflecting surface

 17-It is located in one of the spiral arms of the milky way galaxy on the edge of the galaxy

18-A medical case as a result of the formation of the image behind the retina

19-The total distance that a moving object covers divided by total time taken to cover this distance

20-The object <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> changes (increase or decreases ) by equal values through equal periods of times

21- A biological process where the living organisms produces new individuals of the same kind and thus ensuring its continuity

22-The angle between the incident light ray and the perpendicular line on the reflecting surface from the point of incidence

23- the nucleic acid that carries the genetic traits of the living organism

24-A mirror , always forms a diminished image for the object

25-The displacement in one second

26-Groups of stars gathered indistinctive shape

27-The ability of some animals to compensate their missing parts

28-The point of connection of the two chromatids in a chromosome

29-Line that passes through the optical centers of curvature of its faces

30-The distance between the pole of a spherical mirror and its center of curvature

31-The <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> of a moving body that covers equal distance at unequal  time intervals

32-The <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> of a moving object relative to a constant or moving observer

33-The mirror whose reflecting surface is a part of the inner surface the sphere  

34-A point inside the lens lies on the principle axis in the mid distance between its faces

35-The nucleic acid that carries the genetic materials of the living organisms

36-Bouncing of the light to the same side when it strikes a reflecting surface

37-The straight line that passes by the center of curvature of the mirror and its   pole

38-A glowing gaseous sphere formed the planets of the solar system

39-it is a mirror that its reflecting surface is a part of hollow sphere

40-The change in the position  of an object by the time relative to a reference point

41-The mid-point on the reflecting surface of the mirror

42-The part in the cell which is responsible for cellular division

43-The incident light ray the reflected ray and the normal line all lie in the same plane perpendicular to the  reflecting surface 

44-The combination of a male gamete and a female gamete to form a zygote

45-The total distance covered by the moving object divided by the total time taken to cover the distance

46-A type of asexual reproduction that occurs in simple algae

47-A phase in which some important vital process occurs to prepare the cell for division and the mount of genetic material duplicate

48-It is the ability of some animals to compensate their missing parts

49-It is a theory that explains the origin of the universe from a massive explosion since 15000 million years

50-The <a href="https://gogoacademy.net/science-prep-1-final-revision/">mass</a> of the cells which result from the abnormal cell when it is continually divided without controlling

51-Boilogical process where the living organisms produces new individual  of the same kind and thus ensure its continuity

52-It is a very thin plastic lenses and can stick to the eye cornea

53-It is the regular <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> by which the object moves to cover the same distance at the same period of time

54-A disease that infects the eye lens and it becomes opaque

55-A vector quantity that equals the displacement in one second

56-Chemically consists  of DNA and protein

57-A physical quantity that represents change in the object <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> in unit time

58-Fibers extend between the tow poles of the cell in prophase

59-The image that can not be received on the screen

60-A theory assumed that the solar system was originally a big star which is the sun

 61-A flat gaseous round disk that formed the solar system planets

62-A cell division that occurs in the somatic cell and results in the growth of the living organism

63-The actual length of the path that a moving object takes from the starting point to the end point

64-It is located in one of the spiral arms of the Milky way on the edge of  the galaxy 

65-The line between the two centers of curvature of the lens passing by the optical center of the lens

66- The phase which the cell  prepares to division by  duplicating the genetic material

67-The displacement covered through a unit time

68-The point of connection of the 2 chromatid of the chromosome

69-A type of asexual reproduction that takes place in plants vegetative organs without seeds

70-A theory based on an astronomical phenomenon in which a star  was glowing for a short time and then its glowing disappears gradually

71-The value of an objects <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> relative to the observer 

72-The the total distance covered by a moving body divided by the total time

73-The physical quantity that has magnitude only and has no direction

74-An optical piece is thin at its center and more thick at the tips and diverging light rays falling on it. 

75- A Mirror can be used to get virtual upright and magnified image of an object

76-Angle of incident light ray equals its angle of reflection

77-A mirror used to form virtual upright and diminished image

78-The line that joins between the two centers of curvature of the lens passing by the optical center of the lens

79-Half the diameter of the sphere where the face of the lens is a part of it

80-The straight line that passes by the center of curvature of the mirror and any point of its surface except its pole

81-intersection which are produced when the light rays fall parallel to the principal axis of the a lens   

82- seeing the near objects clearly and seeing the far object distorted

83-A flat gaseous round disk that formed the solar system

84-The celestial body which the  solar system was formed in  chamberlain and Moulton theory

85-The scientist who established the nebula theory

86-A theory assumed that the solar system was originally the sun

87-The unit which is used for measuring the distance between celestial bodies .

88-It is a wide and extended space that contains all the galaxies stars and planets

89-A theory explains the origin of the universe from a massive explosions since 15,000 millions years.

90-The theory that explained the formation of the galaxies and the stars .

2)Write the scientific term for each of the following :

1-A unit is used for measuring the distance between celestial bodies. light year

2- The point at which the rays which incident parallel to each other and parallel to principle axis of the concave mirror are collected. principle focus of concave mirror

3-The cells produced from meiosis cell division and contain half the number of chromosomes. Gametes

4-Apoint in the middle of the lens lies at the principle axis in the mid distance between its faces. Optical center

5-The ability of some animals to compensate the missing parts by reproduction. Regeneration

6-The thin which moves by constant <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a> in the space even the surrounding conditions are changed .The light

7- A process in which the inner parts of chromatids of each tetrad are exchanged. Crossing over

8-linked to the change of an object position as time passes according to the position of an the object .The motion

9-The line joining the center of curvature of the lens and its optical center.

The principle axis

10-A flat gaseous round disk that formed the solar system. Nebula

11-indirct cell division                                                                  (mitotic or mitosis)

12-reduction division                                                                     (meiotic or meiosis)

 3)Define:

1-spindle fiber: fibers extend from the 2 poles of the cell or from cytoplasm of the plant cell  in prophase

2-abody covered 40 m northward direction in 20 second :the <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a> = 2 m/sec

3-the angle of reflection =30: the angle between the reflected ray and the normal=30

4-a car covers equal distance in equal periods of time: the car moves by regular <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>

5-the lens: transparent medium refracts light and limited with 2 spherical surfaces

6-the relative <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> : it is the <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> of moving object relative to observer

5- Light reflection:

-It is the phenomenon of the light bouncing “return back” off in the same medium when it meets the reflecting surface.

6- Spherical Mirrors:-It is a mirror that its reflecting surface is a part of hollow sphere

7-the crossing star :-it’s the huge star which was attract a part of   the sun

8-mitotic cell division :

-the division  which occurs  in somatic cells and  reproductive( no in neural cells or adult red blood cell)for growth of living organisms and compensate the damage cell and complete the asexual reproduction

4) What is meant by (define)?

1-the optical center of the lens :

-appoint inside the lens on principle axis at mid point between its faces

2-vegetative reproduction:- asexual reproduction that takes place in plants without seeds

3- Nebula: glowing gases sphere rotate around itself and formed the planets

4-irregular <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> :

-it is the change in object position by equal distance at unequal periods of time

5-centromere: -the point of connection of the 2 chromatids of chromosome

6-virtual image: -image that cant received on screen

7-A body moves by acceleration equal zero : -the body moves with uniform <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>

8-a person suffers from a long sightedness :

– the person see the far object clearly and the near object less clearly

9-fertilization: the fusion between male and female gametes to produce zygote

10-regeneration:ability of living organism to compensate the missing parts

11-dispacment: the shortest straight line between the start point and the end point of the moving object

12-the center of convex mirror of curvature: the center of the sphere that the mirror is part of it

13-the second law of light reflection: the incident light ray ,the reflected rat and the normal all lie in a plane perpendicular to the reflecting surface

14- the first law of light reflection: incident angle=reflected angle

15-the light year :the distance covered by light in one year

16- a body moves by acceleration =-2 m/sec2 :the rate of change of its <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> equal=-2m/sec

17-the radius of curvature of a concave mirror =8 cm : the distance between the center of mirror and any point at its surface =8 cm

18- the light year= 9.46 x 10¹² km :the distance covered by light in one year = 9.46 x 10¹² km

19-the focus of the concave mirror- It is the point of collection of the reflected light rays

20-the secondary axis of the concave mirror

It is the straight line which passes by the center of curvature of the mirror and  any point on its surface except the pole of the mirror

21- A moving car covers a distance of 100 km in 2 hours

• The car moves by a <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> of 50 km/h

22-the focal length of a convex lens =8 cm

-the distance between the focus and the optical center =8 cm

23-The change of an objects location as time passes

-The motion of the object

24-the focal length of a lens is 7 cm

-the distance between the focus and the optical center of the lens is 7 cm

25-An object moves with acceleration equals zero

-The object moves with regular <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>

26-the angle of reflection of a light ray is 45

-the angle between the reflected light ray and the normal is 45

27-The space is in a continuous motion

-This due to the continuous motion of galaxies in the universe

28- the formed image by the plane mirror is virtual

-It can’t be received on a screen

5)What is the importance of :

1-The Hubble telescope: used to collects photos for universe to study the evolution of the universe after the Big Bang

2-Nano-molecules of gold: used to attach to the cancerous cells and monitor them

3-The telescope: used for formation enlarged images for the heavenly bodies

4-The convex mirror: used as side –view mirror on the passenger’s side of a car

5-solar telescope

6-spindle fibers

7-cytoplasm in plant cell

8-centrosome in animal cell

10-Big bang

11- nebular theory

12-crossing star theory

13-lesns

14-Mirrors

15-DNA

 16-Chromosome

6)Give reasons ?

1-The force and force are considered as a vector quantity –because they have  magnitude and direction

2- the <a href="https://gogoacademy.net/science-prep-1-final-revision/">mass</a> is scalar quantity ? –because it has magnitude only

3-before starting division the cell passes through interphase(cellular division begins with interphase ): -To duplicate genetic materials (DNA)

4-The convex lens is used to correct the long-sightedness   -To return the image on retina

5-the asexual reproduction depends on the mitosis-to produce complete copy of the parent

6-the sexual reproduction is the source of genetic variation

-due to the combination between the male gamete and female gamete

7-the spherical mirror has only one principle axis

-Because it has one spherical surface

8-most of moving cars can not move inside crowded town all the time by uniform <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>

-due to the traffic  and road condition

9-The stability of earth in an orbit around the sun -due to the gravitational force

10-the number of chromosomes is constant in the same <a href="https://gogoacademy.net/science-prep-1-final-revision/">species</a> which reproduce sexually

-because it results from combination of male gamete(N) with female gamete(N)

11-the mitosis is important for children than the meiosis

-because it responsible for growth of children

12-the word a MBlIANCE is written in a converted way on the car

-to appears in correct way on front of driver 

13-the perpendicular incident light ray on the plane mirror reflects on itself

• Because the incident angle = the reflected angle=0

14-a convex mirror is put at the left side of the driver of the car

-to get a small ,erect image of the way

15-the continuous expansion  of the space-due to the continuous  separation of galaxies 

16-the importance of speedometer in the car- to measure the <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> of the car directly

17-the importance of occurrence of crossing over   phenomenon

-to causes genetic variation of traits in the offspring

18-the individuals resulted from the sexual reproduction are not similar to one of parent

-because it produced from combination of male and female gametes

19-the movement of the train can be considered as a motion in one direction

-because it moves forward and backward

20-Galaxyies move away from each others-due to continuous expansion of universe

21-the lens has two foci but the spherical   mirror gas one focus only

Because the lens has 2 spherical surface  but the mirror has one spherical surface

22-the moving car with a certain <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> seems to be at rest to the moving observer with the same <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> and the same direction

-because the relative <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> equals the difference between their <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> = zero

23-concave mirrors are used to generate high heat <a href="https://gogoacademy.net/science-prep-1-final-revision/">energy</a>

-because it collects the ray on focus

24-physicists use mathematical methods like graphs and table

-To easy study the physical quantities and find the relation between them

25-Asexual reproduction keeps the genetic structure of the living organism

-because it produced from one parent by mitotic division

26-pilots take in consideration the <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a> of the wind

-Because flying of airplane opposite the wind needs more fuel and more time  

27-The focal length of a concave can be determined by knowing its radius of curvature

-be cause lte F=r/2

28-The image formed by the convex mirror cant be revived on screen

-Because it is virtual image formed by the intersection of refected ray from the mirror

29- The image formed by the convex mirror is virtual image

Because it cant received on screen and it is formed by intersection of extension of reflected rays

30-Most of the people cannot write by correct way while they are seeing their writings through plane mirror.

-Because the formed image is laterally inverted.

31-The most moving cars cannot move inside crowded towns all the time by uniform <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a>  -Due to the traffic of road and station conditions

32-It is impossible to obtain real image by using concave mirror only

-Because it diverges the light rays.

33-The moving car seems stable to the rider of another moving car beside

it with the same <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> and direction

-Because the relative <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> for the 2 cars in same <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> and direction is the difference between their <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> ( V2 – V1) =zero.

34-Asexual reproduction produces offspring identical to their parents

Because the new individuals contain an identical copy of hereditary  traits of the patent cell by mitosis division

35-Occurrence of interphase before starting cell division

-to prepare the cell to cell division by duplication of  genetic materials

36-When the object is placed on focus of convex lens no image is formed

-because the refracted rays from the lens cant intersect at any point

37 – there are new races of grapes when they reproduce by vegetative reproduction

-because it occurs by one parent and by mitotic division to produce new individuals identical to the parent

38-The nebula lost its sphere from and become in a form of flat rotating disc

-Due to the effect of centrifugal force

38-The body move with acceleration cant move at regular <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>

-Because the acceleration is the change in object <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> and the regular <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> is a constant <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> (not change in <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> so a=0)

39-The shrinking of spindle fibers during the anaphase

-To drag the chromosomes towards the cell poles

40-(distance –Time) graph of an object that moves at uniform <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> is a straight line passing through the origin point

-Because from V= distance/ time  the relation between distance and time is direct relation when v is constant

41-the shortsightedness is corrected by a concave lens

-to to diverge the ray to return the image from front of retina to be formed at retina

42-The cell division begins with interphase before starting mitosis division

-to duplicate the genetic material and to make some vital process

43-The lens has 2 centers of curvatures

– because the lens is a part from 2 spherical objects each object has a center of curvature

44- binary fission is considered a mitotic division

-because it produces 2 cells each cell is identical to the parent cell

45-Crossing over phenomenon is an important factor in genetic variation among individuals of the same <a href="https://gogoacademy.net/science-prep-1-final-revision/">species</a>

-due to the exchanging between the 2 parts on inner chromatid where each part carries  a genetic traits

46-Every galaxy has a definite shape differs of other galaxy

-Due to the harmony and order of stars in it

47-Meiosis division  is called reduction division

-because it produces cells has half(N) numbers of chromosomes that are in parent cell   

48-Pilots take in consideration the <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a> of the wind

-because when they fly in the opposite direction of the wind the consume more fuel and more time and vice versa   

49-The image formed by plane mirror can not received on screen

Because it is virtual image that is formed behind the mirror

50-When you look at the mirror you see your image

-due to regular reflection of light on the smooth surface of the mirror

51-Mitosis is important for children unlike the meiosis

-because it is responsible for growth and compensate the damage cells while meiosis occurs in adult age

52-The perpendicular incident light ray on the plane mirror reflects on itself

-Because the incident angle=the reflected angle =ZERO

53-Cataract disease infects the eye

-because the lens become dark due to the old age ,drugs and genetic readiness ,illness  

54-sexual reproduction is a source of genetic variation

-because it occurs between male(N) and female (N)gametes with deferent genetic traits and cross over occurs

55-The sun escaped from the gravity of the huge star in the crossing star theory

-due to the explosion of the attracted part of the sun that faces the huge star

56-The constancy of the planets in their orbits around the sun

-due to the gravity of the sun

57-The number of chromosomes is constant in the same <a href="https://gogoacademy.net/science-prep-1-final-revision/">species</a> which reproduce sexually

-because it is formed by combination of male gamete(N) with Female gamete(N)

58- in shortsightedness the retina is far from the eye lens

-due to increase the eye diameter and increase the convexity of the eye lens

59-The object which moves at regular <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> its acceleration  equals Zero

-because the V1=V2 so a=v2-v1/t = 0

60-speed of a moving body increases by decreasing time needed to cover a certain distance

-Because <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> = distance/ time so <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> is inversely proportional to the time at constant distance

61-The formed image by convex mirror is always virtual

-because it can’t received on screen

62-uniform <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> of a car is hardly to done practically

– due to the change in <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>  a cross the time that depends on the traffic in street

63-The convex mirror is placed in the left side of the driver.

-to make erect and smaller images for things behind  him

64-The constancy of the earth’s rotation in an orbit around the sun

-Due to the gravitational force.

65-Mitosis division is important for children than the meiosis.

-Because mitosis is important for growth of living organisms and compensate the damaged cells

66-The number of chromosomes is constant in the same <a href="https://gogoacademy.net/science-prep-1-final-revision/">species</a> which reproduce sexually

Because the <a href="https://gogoacademy.net/science-prep-1-final-revision/">species</a> is produced from combination of male gamete(N) and female gamete (N) forming zygote (2N)chromosomes

8)Complete the following statements with suitable words : 

1. The convex lens …………. The light rays , while the convex mirror……. The light rays .
2. The chromosome chemically consists , of unclear acid called ……….. and protein .
3. The scientist who established the nebular theory is ….
4. Force is considered as ……… physical , while the <a href="https://gogoacademy.net/science-prep-1-final-revision/">mass</a> is considered as ………… physical quantity .
5. Somatic cells divide by ………. Division, while reproductive cells divide by ……. Division.
6. The gamete has number of chromosomes equals………. The number of chromosomes in the original cell .
7. The image formed by …….. lens is always virtual , upright and diminished .
8. The somatic cells divide b …. Cell division, while the reproductive cells divide by …………. Cell division .
9. If the angle between the incident light ray and the reflected light ray on a plane mirror = 120. Then the angle of reflection = ……………
10. The chromosome chemically consists of …… and protein.
11. The Solar system is located in the …………..
12. The result of multiplying the <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> of a moving object by time = ………….
13. The tow factors necessary for the description of movement are ……….. and ………
14. If the light ray falls passing through the focus of the concave mirror, it will reflect …..
15. From the properties of the image formed by a plane mirror are …… , ……. And ….
16. The universe is ……….
17. In flowering planets, the pollen are formed inside the ……… , while the ovules are produced inside the ……..

9)Complete the following by suitable scientific words:

1) The somatic cells divide by Mitotic cell division while the reproductive cells divide by …Meiotic  cell division

2) The yeast fungus reproduces by budding which is considered as a type of  Asexual  reproduction

3) From the example of living organisms which reproduces by regeneration is Starfish

4) When the male gamete fuses with female gamete A zygote  is formed

10)What  happens when:

1-the diameter of the eye ball becomes larger than normal

-The image of object is formed far away in front of retina so short sightedness occurs

2-A light ray falls perpendicular on a plane mirror              – it reflects on itself

3-fusion of a male gamete with a female gamete               -A zygote is formed

4-a light ray falls parallel to the principle axis of the concave mirror

• It reflects passing through the focus

5- a light ray falls passing the focus of the convex lens

-it refracts parallel to the principle axis

6- a light ray falls passing through the focus of  the concave mirror

-it reflects  parallel to the principle axis

7- a starfish loses an arm with a part of central disc

– it will be compensate the missing part and the missing part will  be regenerate forming new individual

8-A light ray is incident passing through the center of curvature of concave mirror

-it will reflects on itself

9-Focusing laser  on the gold Nano-molecules in the cell infected by cancer

• The cell will be exploded

10-The acceleration of an object moves at uniform <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>

-the acceleration = ZERO

11-when combination of male gamete with female gamete to form zygote

-Fertilization  occurs then mitotic division occurs to form embryo

12-The acceleration with which the body is moving equals zero

The body moves with uniform <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> where its final <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> equals its initial <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>

13-The distance between a planet and the sun increases

-the effect of gravity  decreases and planets movement becomes slower

14-A ray passing the optical center of the lens –it passes through the lens without refraction

15-Body is placed at the double focal length of the concave  mirror.

Areal inverted equal image is formed at the center of curvature

16-Putting yeast fungus in a warm sugar solution.

-New individuals are produced by budding  in a form of a colony or separated

17-Absence of centrosome from the animal cell

-spindle fivers are not produced in cell division

18-The nebula lost its temperature in Laplace

-its size decrease and its <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> increases

19-A person who has  long sightedness defect is used a convex lens while reading

-to return back the image from behind the retina to form on retina

20-Amoving body covers the same distance in half the time according its <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>

-the <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> increases to double value

21-crossing over occurs

– genetic variation occurs

22-reprodctive cell do not divide by meiosis

-gametes are not formed

23-A moving object completes a complete cycle(concerning displacement and <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>)

–   displacement=0 and velocity=0

24-the object moves in straight line(concerning displacement and <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> and <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a>)

-distance= displacement and speed= <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a>

25-Bulge is disconnected from the parental cell in the yeast fungus after it fully

– it will be form a new individual

26- plane mirror is put on the left side of the car driver

-the driver can’t see all the road due to the formation  of equal reversed  image of the road

27-the moving object returns back to its starting point concerning of displacement  and <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a>

-displacement = 0 and <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a> = 0

28-a light ray passes through the optical center of the lens

-it passes without refraction

29-the moving body takes double the time to cover half the distance according to its <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>

-the <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> decreases to quarter (1/4)

30 –crossing over doesn’t occur

– no genetic variation occurs

11)When the following happens ?

1-the vector physical quantities are added and subtracted

• When these vector quantities have the same measuring units

2-The distance is identical(equal) to the amount of displacement 

-when the object moves in direct straight line in one direction 

3-A body moves at irregular <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>

-when the body covers equal distance at unequal periods of time

Or when the body covers unequal distance at equal periods of time 

4-If the number of chromosomes in a human pancreatic cell is 23 pairs of chromosomes what is the number of chromosomes in the following cells:

1-skin cell (23 pairs chromosomes)             2-sperm(23 chromosome)                

3-fertilized ovum(23 pairs chromosomes)

12)Correct:

1-nine planets rotates around the sun (8)

2-The radius of curvature =1/2 X focal length(2)

3-Aomeba reproduce by budding

4-Chamberlain is the scantest who put the modern theory about the evolution of the solar system (Alfred Hale)

5-The phase in which the cell prepare itself to divide by duplicating the genetic material is anaphase (interphase)

6-Jupiter rotates around itself once every 59 earthly days( mercury )

7-The image of an object placed in front of  a convex mirror is always larger than the object 

8-In anaphase from mitosis ,chromosomes are arranged along the cell equator.(metaphase)

9-The incident light ray passing through focus will reflect back on itself.(parallel to the principle axis)

10-The displacement ,<a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> and acceleration are scalar physical quantities.(vector)

11-Sexual reproduction is the lowest common type of reproduction especially in the higher living organisms (higher)

12-From the scalar physical quantities is the displacement (<a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>)

13-when an object is put in front of a concave mirror at the center of  curvature for a mirror the formed image is virtual ,upright and enlarged (real,inverted, equal the object)

14-The day on Saturn is the shortest day from the day in other planets(jupiter)

15-The sexual reproduction depends on tow essential processes which are fertilization and crossing over (gametes formation)

16-The distance of the image from the plane mirror is more than the distance of the body from it (equal to)

17-The measurement unit of <a href="https://gogoacademy.net/science-prep-1-final-revision/">mass</a> is meter/second (kilogram)

18-A long-sighted person needs a medical eye glasses with concave lenses (short-sighted)

19-The two gases which produced galaxies ,stars and the universe through millions of years are <a href="https://gogoacademy.net/science-prep-1-final-revision/">helium</a> and oxygen (hydrogen)

20-The focus of the lens is a point inside the lens lies on the principle axis in the mid distance between its faces(the optical center)

21-Scientists of closed universe theory see that there is no definite end to the universe

22-The day time is differ from one planet to another due to the <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> of the planet around the sun (the <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> of the planet around  its axis)

23-A convex lens has a focal length of 10 cm so its radius of curvature equals 5 cm.(20)

24-The long sightedness is corrected by using a convex mirror (convex  lens)

25-the galaxy is the time taken by the earth planet to complete one rotation around the sun (light year)

26-The parent cell disappears in the reproduction in yeast (Ameoba)

27-to determine the length ,<a href="https://gogoacademy.net/science-prep-1-final-revision/">mass</a> and the time it is needed to identify magnitude and direction(magnitude only)

28- The time taken by Saturn planet to rotate around the sun is 89 years(29 years)

29-Asexual reproduction occurs in bacteria by spores.(binary fission )

30-The focus is a point inside the lens ,the principle axis passing through it.Optical center

31-The nucleoli disappear during the mitosis cell division in telophase. prophase

32-The incident light ray passing through the center of curvature of  the mirror reflects parallel to the principle axis.  On itself

33-the founder of crossing star theory is Alfred Hale. Chamberlain and moulton

34-The short sightedness is corrected by using of a convex mirror. concave lens

35-Euglena reproduces asexually by budding. binary fission

Problems:

1- A convex lens with a focal length of 10 cm , an object was placed at a distance of 20 cm from the lens. Assign the distance of the object’s image from the lens and mention its properties.

The distance between the image and the lens = 20cm The properties of the image: ( Real, inverted and equal in size to the body)

2- A race car can move from stationary position and its <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> reaches 100 kilometers through 20 seconds. Calculate the acceleration of the car.

A = v2 – v1/ t = 100000 – 0/ 20 = 5000m/sec2

 3- A body started to move from point x to point A covering a distance of 30 meters to the north in 20 seconds, then it moves 60 meters eastward to point b within 30seconds then it moves 30meters southward to point c within 10 seconds.

Calculate: 1- the total distance covered by the body ( 30 + 60 + 30 = 120 meter)

2- The total time taken by the body ( 20 + 30 + 10 = 60 seconds)

3- the average velocity( 60/60= 1 m/sec)

4- the average <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> ( 120 /60= 2 m/sec)

4- A car moves in straight line, if its <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> changes 5m/sec to 10m/sec within 5 seconds. Find the acceleration and its kind.(A= V2 – V1/ t = 10-5/5 = 1 m/sec2 . Positive acceleration)

5- An object is placed in front of convex lens at distance of 6 cm. knowing that the

focal length of this lens is 3 cm.

1- Determine by drawing the position of the formed image

( on the center of curvature at a distance of 6 cm)

2- Mention the characteristics of such image(Real, inverted and equal in size to the body)

6- If the number of chromosomes in a human pancreatic cell is 23 pairs of

chromosomes. What is the number of chromosomes in the following cells:

– Skin ( 46) – sperm (23) – fertilized ovum (46)

7)If the angle between the incident ray and reflected light ray falling on a plane mirror=120.calculate the angle of incident

 8)A lens is placed in front of sun rays a very small real image for the sun is formed at a distance of 20 cm from the optical center of the lens. Show b drawing how is a real inverted and equal image to the object is formed ?

 9)if angle between the incident ray  and the reflecting surface 40 . find the angle of reflection . give reason.

Various questions:

1- Draw a diagram to illustrate the image formed when the object at a distance more than double focal length of concave mirror.

 2- Explain the relation between the hereditary structure of offspring and parents in the cases of sexual reproduction and asexual reproduction.

3- ” Alfred hell; depends on scientific fact to make its imagination about formation of solar system” Discuss this statement showing:

1-This fact by usage a drawing to illustrate it

2-The important hypothesis of Alfred hell imagination

Complete:

1-The sun and the planets revolve around the center of ……….. galaxy

2-Mitosis occurs in the …….. cells of living organisms

3-distanc is a …. Physical quantity while force is a …. Physical quantity

4-the scientist who establish the modern theory about the evolution of the solar system

5-The distance that the moving object covers within a unit time is known as …

6-The incident light ray which is parallel to the principle axis of concave mirror reflects passing through …..

7-The scientist believe that the matter of the universe was a …… .. ball of high pressure and high temperature

8-The long-sighted person needs glasses of ………….. lens

9-Vegetative reproduction in plants happens by …………   division

10-……………. Scientist who founded the nebular theory

11- The spindle fibers are formed during the cell division in ……..

12-…………….  Are formed of groups stars in the universe

13-Acceleration is considered one of ………… physical quantities while time is considered one of …… physical quantities

14-The solar system is located in one the …… arms of the Milky way on the edge of the galaxy

15-Somativ cell are divided by ………. While reproductive cells are divided by ……..

16-In Milky Way galaxy the old stars (the older) gather in the ………. Of the galaxy

17-Parental individual disappears when reproduction occurs in ………

18-The incident light ray that passes through the focus of the convex lens it exists from the lens …..

19-Mass is considered from ……. Physical quantity

20-From the scalar physical quantities  is …….. while ……… is from the vector physical quantities

21-Condensing the cytoplasm in the two poles of the plant cells forms ……

22-Crossing over phenomenon happens between the ……. During the meiosis division

23-In human and animals meiosis occurs in ….. to produce the male gametes while it occurs in ….. to produce the female gametes

24-Vision defect which due to the decrease in the eyeball diameter is called …….. and is corrected by …… lens

25-The two factors which can be used to describe the motion of a body are the …. And …..

26-The big Bang theory explains the origin of ……. While the nebular theory is one of the theories which explain the organ of …..

27-In animal cell spindle fibers formed from …… while in plant cell spindle fibers from  ……. At the poles

28-The product of the <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a> of moving body x the time equals ……

29-The galaxy that the solar system belongs is called …..

30-The image formed by concave lens is always …….., …. , erect and diminished

31-The nucleolus and nuclear membrane disappear at the end of ……… of mitosis

32-The change of an object position as time passes according to the position of another fixed object is called …..

33-The contact lenses are used instead of the …….  And it is made of ……..

34-The convex lens ……. The light while the convex mirror …….. the light

35-The solar system is located in one of the spiral arms of the …….. on the ………

36-movment path in one direction may be …… , …….. or combination of both.

37-The cell ……… contains the genetic material of the living organism which consists of a number of …….

38-when the object lies in front of …….. lens a virtual and diminished image is formed

39-the yeast fungus reproduces by ……. While the starfish reproduces by ……..

40-The ……. Scientist established the modern theory of evolution of the solar system

41-The Egyptian scientist Mustafa EL-Said discovered a way to detect the cancer cell by using ……

42-A short-sighted person needs a medical eye glasses with …….. lenses

43-The chromosomes chemically consists of nuclear acid called DNA  and …….

44-The spindle fibers in the animal cell is formed from ………  while in the plant cell the piddle is composed from ……. At the cell poles

45-From the examples of the multicellular organisms reproduced by budding is ……..

46-The point that lies in the middle of the reflecting surface of the concave mirror is called …..

47-The displacement covered by a body in one second is called …..

48-speed measuring unit is ……… while the measuring unit of acceleration  is ………

49-The crossing over phenomenon occurs in ………. Of …….. division

50-…….. and …….. are types of spherical mirrors

51-The sun and the planets revolving around it rotate around the center of …… galaxy

52-…….. reproduction doesn’t required neither special systems nor structures in the living organisms.

53-……..  are used instead of medical glasses to treat vision defects

54-when the object is placed at ….. of convex lenses there is no image will be formed.

55-The moving car with 50 Km/h in constant direction its <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> appears 110 Km/h related to the observer moves with 60Km/h in ……… direction of the car motion

56-The crossing over phenomenon occurs in ……… of first meiosis division

57-The solar system consists of a number of …. Planets revolve around the sun

58-The physical quantity that its magnitude and direction are necessary for identifying it is called ……..

59-A concave mirror has a focal length of 20 cm then the radius of curvature of its spherical surface equals …..

60-Correcting long-sightedness by using …… lens and correcting short-sightedness by using ……. Lens

61-Yeast fungus reproduces  asexually by ……. While the amoeba reproduces asexually by …….

62-…….. image can received on a screen

63-The stars move in a fixed orbit around the center of the ….

64-The measuring unit of acceleration is ……. And the measuring unit of <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a> is ….

65-Asexual reproduction take place by in the yeast

66-we use …… lens to obtain a virtual and magnified image

67-The straight distance covered by object in a certain direction is called …

68-The ….. telescope is from the space telescope

69-The spindle fibers are formed during the cell division in ….

70-The double of the distance between the optical center of a lens and its focus = ….

71-The <a href="https://gogoacademy.net/science-prep-1-final-revision/">velocity</a> is the ….. in one second

72-Force is considered …….. physical quantity and <a href="https://gogoacademy.net/science-prep-1-final-revision/">mass</a> is considered …….. physical quantity

73-The rate of change of distance is called ….

74-The rate of change of displacement is called …

75-the rate of change in <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> is called ….

76-the distance in a certain direction is called

77-The distance in a straight line is called ……

Relative <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a>:

Two vehicles are travelling from the same location at the <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> of 6 km/hr and 4 km/hr respectively. Calculate the distance between the vehicles after 10 minutes given that both vehicles are travelling in the same direction.

Solution:

The relative <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> when in the same direction= (6 – 4) km/hr= 2 km/hr

Total time taken = 10 minutes

Therefore distance travelled = <a href="https://gogoacademy.net/science-prep-1-final-revision/">speed</a> × time= (2 × 10/60) km= 1/3 km
= 1/3 × 1000 m
= 333.3 m

Therefore, the distance between the vehicles after 10 minutes is 333.3 m given that both vehicles are travelling in the same direction.

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