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Model answer 1-A1- displacement 2- light year 3-gametes formation - fertilization 4- concave 1- B1- The transparent medium that refracts the light and is limited with two spherical surfaces and it is usually glass or plastic 2- The angle between the incident light and the normal. 1-c1- Due to the difference in the distance between the planet and the sun and the speed of rotation of the planet around the sun 2- In order to predict the relation between certain physical quantities and understanding practical results to describe physical phenomena in easier way 3- Because it is produces from the male and female gametes 2-a 1-a 2-b 3-d 4-a 5-b 2-b1- A = v2 –v1 = 20-0 = 4 m/sec2 T 5 2-postive acceleration 2-c1- It size contacted and its revolving speed around it self increase 2- It will reflect passing through the focus 3-a1- Relative speed 2- Solar system 3- Vector physical quantities 4- Newton’s law of universal gravitational force 5- First law of light reflection 3-b1- 23 chromosomes 2- 23 pairs of chromosomes 3-cInverted , equal , real. 4-a1- Speed. 2- Alfred Hall 3- Prophase 4- 20 m/sec 5- 4 meters 4-b1- The distance = 30+40 = 70 meter 2- Average speed = total distance = 70 =10m/sec Total time 7 4-c1- Short sight by using concave lens – long sight by using convex lens . 2- Closed universe theory : Universe will stop expand and begin to contract unit it become hot preparing new big bang Opened universe theory: no defined end Model answer 1-a1- Centormere 2- Hydrogen 3- 40 cm 4- Displacement covered 1-ba = v2 –v1 = 25 – 0 = 2.5 m/sec 2 Δt 10 1-c1- This means that he can see the near object only clearly but far object seems distorted 2- This means that the speed of this car relative to another body is 90 km/hr 2-a1- D 2- B 3- A 4- A 2-b- 1- Due to the continuous separation between galaxies in the universe 2- Because it gets its genetic traits from one parent through mitotic division 2-cAngle of incidence = 140 º/ 2 = 70º 3-a1 – lens 2 Fertilization 3- The sun 4- Regular speed 3-b1- Day : It is the period taken by the planet to make one complete rotation around its axis. Year : It is the period taken by the planet to make one complete rotation around the sun. 2- To form a real and magnified image the object is located between the focus and the center of curvature To form a virtual and magnified image the object is located before the focus 3- C – 40m/sec 4- A1- Zero 2- Binary fission 3- Light reflection 4- Distance / speed 4-b1- It passes through the lens without refraction 2- It size contracted and it speed around it self increase 4-c1- 23 chromosome 2- 23 pairs of chromosomes Model answer 1-a1- Vector – scalar 2- Plane 3- Gametes formation – fertilization 1-b1- Because the lens has two circular surfaces but the mirror has only one circular surface 2- Due to the distance between the plant and the sun and its speed of rotation around the sun 1-cIt is the change of object’s position by equal distance at equal intervals of time 2-a1- C 2- A 3- B 4- C 2-ba = v2 –v1 -2= v2 – 80 v2= (-2x12)+80 = 56m/sec Δt 12 2-c1- The planet will leave their orbit and move in a random way and this will lead to destruction of the earth 2- The genetic variation occurs among the members of the same species 3-a1- Acceleration 2- Focus 3- Solar nebula 4- Milky way galaxy 5- Spindle fibers 3-b- Real , inverted , small 3-c1- 23 pairs of chromosomes 2- 23 pairs of chromosomes 4-a- 1- Average speed 2- Nebular theory 3- Virtual , erected and small 4- Anaphase 4-bShort sight: It is the vision defect through which near objects can be seen clearly but far objects seen distorted. The image formed in front of the retina.-------Correction by using concave lens . long sight: It is a vision defect through which far objects only can be seen clearly but close objects are not seen clearly. The image formed behind the retina.------correction by using convex lens . 4-c1- It is the speed of a moving object relative to an observer 2- It is the space which contains all galaxies, stars, planets, moons and living organisms. Model answer 1-a1- Relative speed 2- Spindle fibers 3- Contact lens 4- Light 5- Regular speed 1-b1- It states that there is no definite end for the universe 2- It is a glowing gas sphere revolving around itself from which the solar system is originated. 3- It is the time taken by the earth to complete one rotation around the sun 1-c1- 48 cm 2- Real , inverted and equal to the object 2-a1- A 2- A 3- C 4- C 5- B 2-b1- Because it gets its genetic traits from one parent through mitotic division 2- Due to the center gravitational force of the sun 3- Because distance is determined by magnitude only while displacement by both magnitude and direction 2-c1- This cause the retina to be far from the lens so it cause short sight 2- The part containing a part of the central disc grows to form new individual 3-a1- Distance 2- Parallel 3- Milky way galxy 4- 220 5- Plane mirror 3-b1- In uterus mitotic division In ovary : meiotic division 2-in uterus 2 cells – 2 N In ovary 4 cells- N 3-c1- Δv = 10m/sec V2-v1 = 10 m/sec As the body moves from rest then V1 = zero then final speed = 10 m/sec 2- Positive acceleration 4-a1- Magnitude and direction 2- Mitosis 3- 20 m/sec 4- 15 cm 5- Helium and hydrogen 4-b1- The real image can be received on a screen the virtual image cannot be received on a screen 2- The crossing star theory Chamberlain and Moulton. The modern theory of the world Alfred Hale 4-c1- The total distance covered = 2+5+1+3+1 = 12 km 2- The displacement = 5 -3 =2 Km in the east DIRECTION 3- The velocity equal = displacement / time = 2/0.033 = 60.6 km/hr in the east direction Model answer 1-a1- Laplace – Alfred Hale 2- Two chromatids – centromere 3- The radius of the plant – the speed of rotation of the plant around its axis 4- Short sight – concave 5- Relative speed – velocity 6- Without refraction – passing through the focus 1-b1- It is the physical quantity that has magnitude and direction 2- It is the change of an object speed in one second in a specific direction 1-c- Real , inverted , small 2-a1- Prophase 2- The displacement 3- The principle axis 4- Jupiter 5- Focus 2-b1- Because the angel of incidence = angle of reflection = zero 2- To help us to identify the car speed directly . 2-c1- 32 2- 32 3- 16 3-a1- The pole of the mirror 2- Sun 3- First law of light reflection 4- Light reflection 5- Solar system 3-b1- Metaphase 2- Spindle fiber not formed 3-c1- The total distance = 30+60+30 = 120 m 2- The total time = 30+20+10 = 60 sec 3- The displacement = 60 m in the east direction 4-a1- A 2- D 3- A 4-b1- The speed = 90x 1000 =25m/sec 3600 a = v2 –v1 = 25 – 0 = 2.5 m/sec 2 Δt 10 4-c1- a- the universe b- the separation of the grains resemble the separation of the galaxies in the universe 2- the universe is in the state of continuous motion Model answer 1-a1- a 2- d 3- b 4- a 5- d 6- a 1-b1- it rotates around the earth at height 500km and collects the photos of the universe since millions of years 2- they are used instead of the glasses to treat the vision defect 1-ca = v2 –v1 Δt 2-a1- relative speed 2- universe 3- the zygote 4- Average speed -2= v2 – 80 12 v2= (-2x12)+80 = 56m/sec 5- Vector physical quantites 6- Angle of reflection 2-b1- Mitosis takes place in somatic cells Meioses takes place in reproductive cells 2- The nebular theory Laplace The crossing star theory Chamberlain and Moulton 2-c- Real , inverted , smaller f = r/2 r = 3x 2 = 6 cm 3-a1- A vector- a scalar 2- Radius of the planet – speed of rotation of the planet around it axis 3- Refracts – reflects 4- Decreases – slower 5- The distance – time 6- Long sight- convex 3-b1- 23 pairs of chromosomes 2- 23 chromosomes 3-c1- When the object moves in straight line and in a fixed direction 2- When the body is placed at the center of curvature of a concave mirror 4-a1- The optical center 2- The speedometer 3- Mercury 4- A concave lens 4-b1- Because of the offspring combines the genetic trades from 2 sources 2- Due to the continuous spacing between galaxies in the universe 3- Due to the condition of the road 4- Because it is the vegetative reproduction occurs by roots,leaves and stems 4-c1- Regular speed 2- Speed of body A = 2/1 = 2 m/sec Speed of body B = 1/1 = 1 m/sec The ratio of speed A : B = 2 : 1 Model answer 1-a1- Concave 2- The principle axis of the mirror 3- Spindle fibers 4- Newton 5- Distance 1-b1- Due to the roads condition 2- Due to the difference in – the radius of the planet –and the speed of rotation of the planet around its axis 1-cFocal length = r/2 = 40/2 = 20 cm Real, inverted and enlarged 2-a1- B 2- A 3- A 4- C 5- C 2-b- 1Real image Virtual image It is formed as a result of the intersection of the reflected or refracted light rays. It is formed as a result of the intersection of the extensions of the reflected or refracted light rays. It can be received on a screen. It cannot be received on a screen. It is always inverted. It is always erect [upright] It is larger or smaller than the object. It is larger, smaller or equal to the object. 2- The crossing star theory Chamberlain and Moulton The modern theory Alfred Hale 2-cThe speed = 72x 1000 =20m/sec 3600 a = v2 –v1 = 0-20 = -2.5 m/sec 2 Δt 8 3-a1- The pole of the mirror 2- Regeneration 3- Scalar physical quantity 4- Crossing over phenomena 5- Universe 3-b1- Closed universe theory : Universe will stop expand and begin to contract unit it become hot preparing new big bang Opened universe theory: no defined end 3-c1- 2- Graph B 4-a1- Mitosis 2- m/sec 3- Jupiter 4- 220 million years 5- Plastic 4-b1- This causes the shortness of the retina of the eye sphere thus the retina is closed to the eye lens and this causes long sight 2- It passes through the lens without refraction 4-c1- The distance covered by the body = 44 x 1.5 = 66 m 2- The displacement = the diameter of the circle = 14 m 3- The average speed = total distance = 66 = 6.6 m/sec Total time 10