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Cairo Governorate Helwan Education Zone El-Mostakbal Exp. Lang. School Exam(2) (1) A) Complete: 1. The somatic cell contains ............... number of chromosomes while the gametes contains ............... number of chromosomes. 2. There are two kinds of mirrors which are ...............and ............... 3. The earth rotates around the ............... while the sun rotates around the center of ............... B) What are the reasons lead to: 1. Difference in year from planet to another. 2. Difference in day length from planet to another. 3. Explosion of stars in modern theory. 4. The incident light ray reflects on itself. C) In opposite figure: A body move from point A to point B Then C then D calculate 1-distance 2-displacement 3-velocity B 30 m 20 sec A 50 m 20 sec C 30 m 10 sec D (2) A) Show by drawing the properties of image formed by concave mirror if the body at distance equal to duple focal length. B) Write the scientific term: 1. The rate of change in distance. 2. Female reproductive cell of human. 3. Group of stars has a spiral arms. 4. The measuring unit of relative speed, C) Give reason for: 1. Density is a scalar physical quantity. 2. There is no image formed if the body standing at focus of convex lens. 3. There is variation between offspring of human. (3) A) Choose the correct answer: 1. If the number of chromosomes in left lung cells of rabbit equal 20 chromosomes so the number of chromosomes in its skin is [40 – 20 – 10] chromosomes. 2. The ............... mirror from erect equal image of on object. [convex – concave – Plane] 3. The most abundant body in the solar system. [planets – universe – sun] B) What happen when: 1. The light ray falls passing through focus of concave mirror. 2. The reproductive cell undergo meiotic division. 3. The speed of rotation of planet around its axis increase. 4. The incident angle decrease to help. C) If a boat starts to move from rest till its speed becomes 2.5 m/sec through 5 sec find the acceleration and its kind. (4) A) What is meant by: 1. Fertilization. 2. Non uniform speed. B) Correct underline: 1. Big bang theory explain the formation of solar system. 2. When the speed increase the time increase. 3. The speed of body that move 1200 meter during one minute equal 1200 m/s. 4. The plane mirrors form equal inverted image. C) Compare between: 1. Short and long sightedness [according to position of image]. 2. Convex and concave mirror [according to position of center of curvature]. 3. Crossing star theory and modern theory [according to name of scientist]. 4. Yeast and amoeba [according to kind of reproduction] With our best wishes. Model Answer Exam (2) (1) A) Complete: 1. Complete or (diploid) – half (haploid). 2. Plane – Spherical. 3. Sun – Galaxy. 6 × = 3 Marks 1. ( ) B) - The distance between sun and planets. - The speed of rotation around the sun. ( ) 2. The speed of rotation of planet around its axis. (1) 3. The nuclear reaction. (1) 4. The incident angle = reflecting angle = zero [falls perpendicular] (1) C) 1. Total distance = 30 + 50 + 30 = 110 m (1) 2. Displacement = 50m AD (1) 3. Velocity = (1) = = 1 m/sec 3 Marks (2) A) 1. Erect. ( ) 2. Equal to object. ( ) 3. Real. ( ) 4. At center of curvature. 3 Marks B) Scientific term: 1. Speed. 2. Egg (Ovum) 3. Milky way galaxy. 4. m/s 4 × 1 = 4 Marks C) Give Reason: 1. Because, it needs magnitude value only to be characterized and doesn’t need direction. 2. Because, the refracted rays are parallel. 3. Because the traits formed from combination between male traits and female traits and due to crossing over phenomenon. (3) A)Choose: 1. 20. 2. Plane. 3. Sun. 3× 1 = 4 Marks B) What happen: 1. It will reflected parallel to the principle axis. (1) 2. It will produce 4 gametes which have half number of chromosomes. (1) 3. The day length decrease. (1) 4. The reflected angle decreased to half. (1) 4 × 1 = 4 Marks C) a = = (1) V1 =Zero = = (1) V2 = 2.5 m/sec = = 0.5 m/sec2 (1) T=5 Sec 3 Marks (4) A)What is meant by: 2 × 1 = 2 marks 1. Fertilization: It's combination of the male gamete and female gamete to form zygote which contain complete number of chromosomes. 2. Non uniform speed: It's the speed of body when it covers equal distances in unequal periods of time. 3. (1) B) Correct underline: 1. Universe. 2. Decrease. 3. 20 m/s 4. Erect (upright) C) Compare between: 4 × 1 = 4 Marks 4 × 1 = 4 Marks Short sightedness Long sightedness Image formed in front (before) Image formed behind (after) retina retina Convex Concave The center of curvature behind The center of curvature in front mirror surface mirror surface Crossing star Modern theory Chamber lain and molten Alfred hale Yeast Amoeba Reproduce by budding Reproduce by binary fission Each question 10 marks 40 / 20 = 20 Marks ناجى عبدهللا/إعداد مدرسة مستقبل حلوان إدارة حلوان 10 × 4 = 40