المراجعة النهائية science الاسئلة المتوقعة2011

[gamal abd el reheem]

Choose the right answer:
1. Speed measurement units are:
1) Meter, second. 2) Meter/second. 3)Meter/second2
2. Acceleration measurement units are:
1) Meter/second.2) Meter, second. 3)Meter/second2
3. 4. The amount of the change of displacements in one second equals:
1) Velocity. 2) Speed. 3) Acceleration.
4. The object moves at constant uniform speed when:
1) It moves at zero acceleration.
2) It moves at constant acceleration.
3) It covers equal distance at unequal times.
5. It is said that the object moves at uniform acceleration when:
1) Its final speed is equal to its primary speed.
2) Its speed increases at equal amounts at equal times.
3) Covers equal distances at equal times,
6. Acceleration is :
1) A vector whose units are m/s2.
2) A vector whose units are m/s.
3) A scalar whose units are m/s2.
7. The amount of change in speed at a time unit determines:
1) Velocity. 2) Displacement. 3) Acceleration
8. If a light ray falls parallel to the principal axis of a concave mirror it will.
(1) Reflect passing by the spherical centre of the mirror.
(2) Reflect passing by the focus.
(3) Reflect on itself.
9. Place an object at the focus of a convex lens, the position of the formed image will be:
(1) Between the focus and spherical centre.
(2) At the spherical centre.
(3) The image is not formed.
10. A concave mirror has a focal vertex of 10 cm, the half radius of the spherical surface equals:
1 - 5 cm 2-10 cm 3 - 20 cm
11. A convex lens has a focal vertex of 50 cm. Place an object at a vertex of 80 cm from the lens. The image of the object is formed at a vertex of
(1) More than 100 cm
(2) Equal 100 cm
(3) Equal 50 cm
12. The image formed by using a concave lens is
(1) Real, enlarged, and inverted.
(2) Virtual, smaller and inverted.
(3) Virtual, smaller and upright.
13. One of students take a time of 10 minutes to transfer from its home to its school moving by average velocity 2m/sec,which of the following equals the distance between its home and the school
1-84m 2-48 m 3-1.2km 4-3.6k m
14.. Displacement is:
1) A scalar and its unit is meter.
2) A vector and its units are meter/second.
3) A vector and its unit is meter.




14.
Which of the following graphical relations represents the moving of the body by uniform
acceleration?


15. In the following figure, a body starts its motion from point (a) to the south to point (b) it covers a distance 40 meters then it directs east to point (c) at a distance 30 meters From point (b), so
a)The amount of body displacement equals:
1 - The length ab 2- The length be
3- The length ac 4- The length ab
b) The length of the distance covered equals:
1 - The length ab 2- The length be
3- The length ac 4- The length ab
The two factors can be used to describe the body motion are:
1 - speed and time 2- distance and time
3- area and time 4- displacement and speed
The concept of body movement means :
1 - static position with a time change
2-the position change with a time change
3-its speed
4- its acceleration
16. The uniform speed of a car is 72km/hour so its speed equals:
1 -20 m/sec 2- 25 m/sec 3-18 m/sec 4- 40 m/sec
17. The value of the speed (v) = c^+c^-k^ That means the produced speed
is.......... Speed ti+t2+t3
1-average 2-increasing 3-nail 4-decreasing
18. When the body covers equal distances in equal times that means the
body moves with :
1-uniform speed 2- uniform acceleration
3-increasing speed 4-increasing acceleration
19. The measuring unit of acceleration is:
1-m/sec 2-km/sec 3-m/sec2 4-sec2/m
When he body moves by acceleration equals zero, that means :
1-body speed is variable
2-body acceleration is increasing
3-body acceleration is decreasing
4-body speed is uniform
20. A concave lens is placed in the passage of sun rays; a very small image for the sun is formed at a distance 5 cm from the optical centre of the lens, if this lens is used to form an equal image for a body, what is the distance between the body and the optical centre of the lens?
1 - 5 cm 2- 10 cm 3-50 cm 4- 60 cm
21. A body is placed in front of concave mirror at a certain distance from its pole, no image is formed on the screen, that is due to the body is:
1 - transparent
2-placed on infinite distance in front of the mirror
opaque
placed on a distance less than focal length of the mirror



3-The Romans use a huge optical piece to burn the sails of enemies' ships by usage sun rays, what is the suitable optical piece to do that?
1-convex mirror 2-concave mirror
3-convex lens 4-concave lens
4-Which of the following physical quantities are consider as vectors only
1 - mass and force 2-displacement and acceleration
3- radius and area 4- force and time
5-The image of the body formed behindthe plane mirror is always:
1 -virual-enlargement - erect 2-real- diminished-inverted
3-real-equal-reversed 4-virual-equal -erect
6-The focal length of a concave mirror equals 10 cm, to obtain a virtua image,the body is placed at a distance from the mirror pole equals
1-10 cm 2-15 cm 3-20 cm 4-5 cm
7-The light year is considered as :
1-a distance covered by light in one year
2- light speed in km/sec
3-the time consumed by light to cover a certain distance
4-the speed of light and electromagnetic waves in km/sec
8- The two gases which produce galaxies, stars and universe across millions of years are:
1-oxygen and helium 2- oxygen and carbon dioxide
3-hydrogen and helium 4-hydrogen and carbon dioxide
9- in which of the following cases the lift rider feels weightlessness phenomenon
1-when the lift ascends upwards with uniform acceleration
2-when the lift ascends upwards with uniform acceleration
3-when the lift descends with uniform velocity
4- when the lift falls
20................................ The source of genetic change is the............................ Reproduction
1-budding 2-vegetative 3-***ual 4-a***ual
10-The number of chromosomes present in the gametes produced from meiosis cell division represents the number of chromosomes (2N) present in somatic cells
1-quarter 2-double 3-one third 4-half
The optical piece which forms equal reversed image to the body is
1-convex lens 2-concave lens
3-spherical mirror 4-planemirror
11-radius of curvature equals 20 cm, so its focal length equals
1- 5 m 2- 10 cm
3-20 cm 4-10 m
12-The weightlessness case takes place when the lift:
1-ascends with uniform speed
2-descends with uniform speed
3-descends with uniform acceleration
4-falls when the carrying wires are cut
The following are a group of measuring physical quantities:
1 -radius and area 2-time and force
3- acceleration and velocity 4-mass and displacement
13-lens is placed in passage of sun rays, a very small image is formed at a distance 10 cm from the optical center ,The same lens is used to obtain virual, enlarged and erect image of a body (a),which of the following distances from optical is correct
1-10cm 2-20cm 3-40 cm 4-50 cm
14-The scientist who establish the nebular theory Is
a. Techemberlen b. Molten
b.Alfred hale d. Laplace
Crossing over phenomenon takes place in
a.First prophase c. First Metaphase
b.First Anaphase d. First Telophase
5-from the forms of a***ual reproduction are , and…….
Spindle fibers appears at the cell division at
a) Prophase b) Metaphase c) Anaphase d) Telophase
Star fish reproduces a***ually through
a) Regeneration b) Binary fission c) Budding d) Spores.................. is used to treat short sighted.
a) Convex lens b) concave lens c) convex mirror d) concave mirror
From the examples of scalar quantities is
a) Velocity b) mass c) force d) acceleration
Speed equals
a) ---------- b) Distance X Time
c) Distance + Time d)

From the example of vector physical quantity
a. Mass b. Velocity
c. Length d. Time
The measuring unit of velocity is
a. Meter c . Meter/sec
b.Meter X sec. d. Meter/sec2
The straight line joints between the two centers of curvature of the lens and its optical center is called
a. Focal length c. Principal axis
1. b.Secondary axis d. Radius of curvature

The second question: Complete the following:
2. The point that is in the middle of the reflective surface of the concave mirror is called................................
3. The straight line that passes by the pole of the mirror and its spherical centre is................................
4. The distance between the focus of the concave mirror and its poles are called................................
5. A convex mirror has a focal vertex of 20 cm, then half the radius of its spherical surface equals ......;.........................
6. A long-sighted person needs a medical eye glasses with a................lens
7. ....................rotates around the earth in a fixed orbit and...............rotates around the sun once every earthly year.
8. Planets rotate around..............................in fixed orbits.
9. The solar system occupies a position at the edge of..................
10. We see from the surface of the Earth...............that this galaxy contains.
11. Galaxies move away in................ and this expanded................... is a cosmic space and galaxies that contain stars.
12. The somatic cells divide by cell division while the reproductive cells divide by cell division
13. The yeast fungus reproduces by budding which is considered as a type of reproduction
14. From the example of living organisms which reproduces by regeneration is,…………………
15. When the male gamete fuses with female gamete………formed
16. Speed measuring unit is………………… and the acceleration measuring unit is the The somatic cells divide by………………… while the reproductive cells divide by…………
17. The crossing over phenomena takes place during………………of the division
18. The stars move in fixed orbits around the centre of the…………………,
19. The presence of the moon between the earth and the sun results in the…………phenomena.
20. The genetic material in the nucleus of the cell consists of a number of
21. From the examples of a***ual reproduction, budding fungus
22. The chromosomes pairs are arranged in first metaphase in the line of the cell…………………...
23. The scientist who founds chaos theory that explains solar system formation is ……………………
24. Velocity is considered as………………. quantity, while density is considered as ……………………….quantity.
25. Amoeba reproduces a***ually by ……………., while bread mould fungus reproduces by…………………..
26.Crossing over phenomena occurs during phase of the division. A Virtual, enlarged and erected image can be obtained by……………mirror
26. The incident light ray which is parallel to pricipal axis of convex lens penetrate the lens passing by…………………
27. The acceleration is quantity, which need………………...and……….. to be completely defined.
28. The spindle fibers are formed during the cell division in…………………………
29. phase, and disappear in the……………..Phase.
30. From the types of mirrors are ……………&…………………
31. From the properties of the formed image by the concave lens are…………………& …………………….





Give reasons for each the following:
1. The continuous expansion of space.
2. The constancy of the Earth's rotation in an orbit around the sun.
3. The difference in the day due to the difference of the planet.
4. The difference in the year due to the difference of the planet.
5. Galaxies move away from each other.
6. Most of the people cannot write by correct way while they are seeing their writings through plane mirror
7. The most moving cars cannot move inside crowded towns all the time by uniform velocity
8. it is impossible to obtain real image by using concave mirror only
9. The shortsighted person requires medical glasses with coneave lenses.
10. A***ual reproduction produces offspring identical to the parents.
11. The perpendicular incident light ray on the plane mirror reflects on itself.
12. The occurrence of partial solar eclipse.
13. The uniform velocity of a car cannot be obtained practically
14. The moving car with a certain speed seems to the moving observer with the same speed and direction
15. The long sight is treated by suitable convex lens
16. The lens has two centers of curvature (M1 ,M2) c Choose the correct
17. Concave mirrors are used in solar ovens.
18. Cellular division begins with interphase.
19. ***ual reproduction is a source for variation between individuals.
20. The stability of Earth rotation in an orbit around the sun.

Write the scientific term for each of the following statements:
1. A point located inside the lens on the principal axis and at the mid distance between its faces.
2. A process in which the living organism producesindividuals with hereditary traits different from the parents.
3. The amount of change in the body's speed in a second. d The unit that is used to measure the distances between the celestial bodies.
4. the point of collection of parallel rays and are parallel to the primary axis of the concave mirror
5. the point of connection of two chromatides to gather.
6. the change of displacement relative to the time
7. The distance covered through unit time.
8. Cells produced from meioses cell division and contains half number of chromosomes.
9. Distance covered per unit time.
10. The line joining between centers of lens curvature passing its optical center.
11. A diseased case results due to the formation of the image behind the retina of the eye.
12. A***ual reproduction occurs by using plant organs except seeds.
13. Cellular division leads to the formation of gametes.
14. Focus of the mirror
15. Centromere
16. Velocity
17. Speed
18. Gametes
Put a (•) in front of the correct sentences and correct the underline in the false ones:
1. The solar system is located at the edge of the Milky Way. ( )
2. Each group of stars is gathered in the solar system. ( )
3. The universe contains various galaxies that move away from each other. ( )
4. d Eight planets including the Earth rotate around the galaxy. ( ) e Galaxies rotate in a system around the centre of the universe.
5. ( ) f Saturn rotates around the sun once every 12 earthly years.
6. Jupiter rotates around itself once every 59 earthly days. ( )


7. h The Earth rotates in a fixed orbit due to the effect of the Earth's gravity.
8. The incident light ray parallel to the principal axis of a concave mirror is reflected passing by the curvature centre of the mirror.
9. The aim of the meitosis division is the formation of garnets.
10. When a moving object travels equal distances in equal time intervals, it is said that it is moving at a regular acceleration.
11. A moving car covers a distance of 500 meters in 25 seconds So, its speed equals 200 meters/seconds
12. ***ual reproduction takes place in plants through spores.
13. Chromosomes are arranged along the cell equator approximately in
14. the anaphase. 4-Eugelena reproduces a***ually by budding.
15. A concave lens is used in treating long sighted.
16. The Nucleolus disappears during the mitosis cell division in telophase.
17. from the scalar physical quantities I velocity.
18. The yeast fungus reproduces a***ually by regeneration.
19. The focus is a point inside the lens passing through it the principal axis.
20. The focal length of a mirror = 2 x radius of curvature of the mirror.


21. The solar system lies in Andromeda galaxy
22. The founder of Star Transit theory is Alfred hell
23. The complete rotation of Mars planet around the sun takes a time equ^ 12 years of earth
24. The long sight is corrected by convex lens

If an object at rest constancy moves regularly until its speed reaches 10 m/s after two seconds of the start of movement:
a) The change in the object's speed after two seconds =...........
b) The change in the object's speed in one second =..................
c Acceleration =.......................................
Problems:
1. a) A special car can move from rest and its speed reaches 90 km/hour in 10 seconds. What is the acceleration with which the car moved?
2. b Within 2,5 seconds the speed of a car increases from 60 kms/ hour to 65 kms/hour while a bike moves from rest and its speed reaches 5 kms/hour in one second.
Which of them moved at a greater acceleration?

Write a paragraph illustrates each of the following:
1. The crossing star theory.
2. The nebula.
3. The cosmic space.
4. The galaxy.
5. The solar system.

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







- 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





- A concave lens its focal length = 10 cm, if a body is placed at a distance 20 cm from the lens, calculate the distance between the lens and the image formed, and mention its properties




- A race car can move from stationary position and its speed reaches 100 kilometres through 20 seconds. Calculate the acceleration of the car.




- Draw the following diagram in your answer paper, then complete it obtain virtual, erect and enlargement image to the object (a)








Define the following :
1 Light reflection phenomenon
2 Spherical mirror
The day by usage of earth rotation
- Explain the relation between the hereditary structure of offspring and parents in the cases of ***ual reproduction and a***ual reproduction.
Answer the fo



a Define the following:
1-the speed

2-acceleration


3-fertilization

4-the universe


answer for the following
statement:
90"

- An incident ray falls on planemirroras inthe figure, it
reflects and the angle of reflection equals .,
1-Zero 2-90o —
3- 180o 4-30o
- What is meant by?
1-Acceleration2-Relative speed3-Centromere
a-" 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
If the number of chromosomes at a human pancreatic cell is 23 pairs of chromosomes.
What is the number of chromosomes in the following cells?
1- Skin cell2- Sperm3- Fertilized ovum
b-Compare between long and short sight from the following points :
1. The type of lens used in treatment of each one
2. The cause of each one
3. Mitosis cell division and meiosis cell division
4. Short sighted and long sighted
5. Reproduction by regeneration & reproduction by budding.
6. Nebula assumption & crossing star theory.
- Complete the following statements
1 -Convex mirror
2-Focus of the lens
3-vector - magnitude - direction
4-Prophase - Anaphase
5-Budding - Binary fission - Spores

[roudan]

اااالف شكر و جزاك الله الف خير

[محمد حسين الشربينى]

جزاكم الله خيرا

[زملكاوى عنيد]

شكرا جزيلا و بارك الله فيك و لك

[زملكاوى عنيد]

Which of the following graphical relations represents the moving of the body by uniform
acceleration?


15. In the following figure, a body starts its motion from point (a) to the south to point (b) it covers a distance 40 meters then it directs east to point (c) at a distance 30 meters From point (b), so
ممكن الاشكال المطلوبه لاستكمال الحل و شكرا

[gamal abd el reheem]

للاسف الاشكال مش بتنزل ؟

[فاطمه احمد ذكى]

اااالف شكر و جزاك الله الف خير

[زملكاوى عنيد]

المشاركة الأصلية كتبت بواسطة gamal abd el reheem

للاسف الاشكال مش بتنزل ؟

شكرا على اهتمامك

[ganaaaa]

ايييييييه الصعوبات دى يانهار ابيض

[badryhashem]

jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj

[احمد مرعي]

ارجو ا تحميلها وورد لتعم الفائدة

[مسترسمير إبراهيم]

جزاك الله خيرا

[Radwa Abdel Moneam]

مجهود كبير جزاك الله خيرا

[sayed aseel]

thank you for all of your effort

[samy sam]

thanks alot