Name:. Class : Junior 6 General exercises with model answers

Transcription

1 United language schools Subject: Science Name:. Class : Junior 6 General exercises with model answers 1. Write the scientific term: 1. Objects help in condensation of water vapour and falling it down as rain. (.) 2. A part in the brain lies below the 2 hemispheres. ( ) 3. A gas used in ammonia industry. (.) 4. It ties muscles with bones. (.) 5. Center of main control in the human body. (..) 6. A flame used in cutting and welding of metals. (.) 7. Areas between vertebrae of back bone that prevent friction. ( ) 8. Substance formed when lime water gets turbid. (.) 9. It contributes in composing gun powder, ammonium nitrate. (..) 10. Gas necessary for photosynthesis.(..) 11. Gas produced from photosynthesis.( ) 12. The increase in its percentage cause harms to Earth's climate.( ) 13. It is the most abundant gas in atmosphere. ( ) 14. Tool used to measure temperature. (.) 15. A molecule consisting of 3oxygen atoms. (.) 16. The product of mass X 10. (..) 17. It is the process that produces oxygen. (.) 18. It is used in making dry ice. (.) 19. It is the axis of the nervous system. (..) 20. The largest part in the brain. ( ) 21. It delivers nerve messages from the body to brain and vice versa.( ) 22. Spontaneous response of body to different stimuli. (.)

2 23. Group of nerves that emerges from central nervous system.(..) 24. It delivers nerve messages from brain to body organs. (.) 25. It delivers sensory information and kinetic responses between central nervous system and all the body.(.) 2. Explain how to get ammonia from Nitrogen gas. 3. Mention the function of:- 1. Ozone layer:. 2. Muscles: Nodular bacteria in roots of legumes:. 4. Oxygen when combines with acetylene gas:.. 5. Peripheral nervous system:.. 4. Complete the following: 1. The nervous system consists of &..&. 2. When lighted magnesium put in cylinder filled with CO2, deposits on the wall of the cylinder that has.color. 3. A body its weight on Earth is 60N, then its mass = on moon. 4. Number of spinal nerves is while that of cranial nerves is 5. Oxygen is produced from while CO2 is produced from 6. If the mass of body on Earth is 200gm, then its weight on Earth=.. 7. and..protect the body from bone diseases.

3 8. Heavy clothes are used in winter to keep the body.. 9. An object its mass on Earth is 6Kg, so its weight on moon= 10. The internal matter of the spinal cord is.&external is The mass is measured by..device while the measuring unit of weight is 12. composes the most important part in protein in human body, and is called The bones of upper limbs are joined with..bones, while that of lower limbs joined with..bones. 14. The main control center in human body is..while.. regulates the heart beats. 15. The upper fixed point in the Celsius thermometer represents.. while the lower point represents. 16. Oxygen is prepared from.in the presence of. 17. CO2 is prepared by dropping over The main idea of making thermometer is changing the.of liquid by changing its Oxygen combines with hydrogen forming.while nitrogen is used in filling and The outer matter of the brain is the matter and is called 21. is a form of energy used in preserving food receives information and make respond to it. 23. connect between the neighboring Neurons forming. 24. is used to measure weight of Gold is the liquid used in making thermometers, while.. is the liquid used in sterilizing themometers. 26. The medical thermometer is divided into..parts each part represents

4 5. What is meant by: 1. Cube of copper its mass is 100grams. 2. Force by which body is attracted to Earth is 20Newton. 3. Atmosphere: 4. Catalyst: 6. Mention one difference between: 1. oxygen and nitrogen concerning combustion. 2. Tendons and joints. 7. Mention the location of: 1. Cerebellum:.. 2. Humerus: 3. Medulla oblogata: 8. What is meant by good heat conductors? Mention 1example and 1usage? 9. Choose the correct answer: 1. The clinical thermometer is different from Celsius in.. a. type of matter used b. type of matter in reservoir c. constriction. 2. If the weight of body is 20Newton so its mass =. a. 2Kg b.20kg c.200kg d.2000kg. 3. The mass of one fourth liter of water equals. a. 5gms b. 25gms c. 250gms d.2500gm 10. Put ( ) or ( ) and correct the wrong sentences: 1. When planet's mass increases, the object weight on it decreases.( ) 2. A black precipitate is formed when CO2 passes over lime water. ( ) 3. The weight of body its mass on Earth 300gm is 30Newton. ( ) 4. Earth suffers from the increase in percentage of CO2. ( ) 5. Mercury is a changed expanding material which gives accurate estimation

5 of temperature. ( ) 6. Synapse is formed as a result of meeting of dendrites. ( ) 11. What would happen if: 1. Continuous exposure to noise. 2. Drinking too much soda water. 3. Getting rid of soil bacteria. 4. Yeast is not added to dough during making of bread. 5. Absence of ribcage. 6. The front arm muscle relaxes and back arm muscle contracts. 7. All bones are without joints. 8. Burning of oil in atmospheric air. 9. Thermometer is given to children. 10. Absence of nitrogen from atmospheric air. 11. Increasing percentage of CO2 in air. 12. Leaving a wet iron nail in air for some time. 13. Back bone is formed of 1 bone. 14. Decreasing the green areas. 12. Give reasons: 1. Muscles play an important role in human movement. 2. It's essential to eat healthy food rich in calcium and phosphorus. 3. The mercury gives wide range to measure the temperature.

6 4. The brain is the main control in the human body. 5. We find spaces between railways. 6. Nitrogen is used in filling car tires. 7. Importance of nitrogen for all living organisms. 8. Shoulder joint moves in all directions. 9. One shall stop breathing if he got hit at the back of his head. 10. You shouldn t take sleeping pills without doctor's prescription. 11. The force of the moon's gravity is less than Earth's gravity. 12. Dendrites extend from the neuron's body. 13. Addiction passively affects nervous system. 14. Knee joint is a slightly movable joint. 15. Muscles play an important role in human movement. 16. Muscles generate movement and kinetic energy. 17. Muscles are fixed to bones. 18. Lime water is used to detect the presence of carbon dioxide gas. 19. Heat is an important form of energy. Important Points Lemon juice combines with sodium bicarbonate producing CO2. Sensory nerve fiber carry nerve messages from the organ to the spinal cord, while motor nerve fiber carry nerve messages from spinal cord to organ muscle. Model answers

7 1. Write the scientific term: 1. Dust and smoke particles. 2. Cerebellum 3. Nitrogen 4. Tendons 5. Brain 6. Oxy-acetylene flame 7. Cartilage 8. Calcium carbonate 9. Nitrogen 10. CO2 11. O2 12. CO2 13. N2 14. Thermometer 15. Ozone 16. Weight 17. Photosynthesis 18. CO2 19. Spinal cord 20. Cerebrum 21. Spinal cord 22. Reflex action 23. Peripheral N.S. 24. Spinal cord 25. Peripheral N.S or nerves. 2. By burning Magnesium in N2 jar then adding water to the product. 3. Mention the function of:- 1. Protects us from harmful sun rays 2. Contract and relax generating movement. 3. Fix N2 and changes it to proteins. 4. Forms oxy acetylene flame that is used in cutting and welding of metals 5. It delivers nerve messages between C.N.S and body parts. 4. Complete the following: 1. nerves, brain, spinal cord. 2. Carbon, black. 3. 6Kg pairs, 31 pairs. 5. photosynthesis, combustion or respiration 6. 2N 7. Calcium, phosphorus, vitamin D. 8. warm 9. 10N 10. gray white 11. Balance scale Newton. 12. Nitrogen azote. 13. shoulder thigh 14. brain medulla oblongata. 15. boiling point of water(100) - freezing point of water(0) 16. hydrogen peroxide manganese dioxide 17. hydrochloric acid calcium carbonate. 18. volume temperature. 19. water car tires & some types of lamps. 20. gray cranial cortex. 21. Heat 22. C.N.S 23. dendrites synapse. 24. spring scale. 25. Mercury - alcohol /10 5. What is meant by: 1. Its weight is 1N. 2. Its weight is 20N 3. Mixture of gases surrounding Earth 4. Chemical substance that remains without any change in properties and quantity during reaction 6. Mention one difference between: 1. O2 helps in burning N2 doesn t help in burning. 2. T: join muscles to bones.

8 7. Mention the location of: 1. In the back area of the head below cerebrum. 2. In upper limps connected to shoulder 3. In front of cerebellum below cerebrum 8. What is meant by good heat conductors? Mention 1example and 1usage? Materials allow heat to pass, as aluminum in making cooking pots. 9. Choose the correct answer: 1. c. constriction. 2. a. 2Kg 3. c. 250gms 10. Put ( ) or ( ) and correct the wrong sentences: 1. X weight increase 2. X white 3. X 3N X regular What would happen if: 1. It will harm the nervous system 2. It will harm the bones 3. Nitrogen will not be fixed, and the legumes will not form proteins 4. CO2 will not be formed, bread will not be porous and tasty. 5. Heart and lungs will not be protected. 6. Move fore arm downwards. 7. Bones will not move. 8. CO2 is produced 9. He will be poisoned as it has toxic material. 10. Fires will not be controlled 11. Global warming happens. 12. It will rust. 13. You will not bend in different directions. 14. CO2 will increase. 12. Give reasons: 1. As it contract and relax generating movement. 2. To avoid having bone diseases as steomalacia and rickets. 3. As it remains liquid between -39 and As it directs, coordinates all behaviors, ideas and emotions. 5. To avoid train accidents as iron expands by heating. 6. As it keeps the volume of tires constant when pressure&temperature changes 7. It build body tissues as it forms the proteins. 8. As it is a freely movable joint. 9. As there is medulla oblongata that control the involuntary actions. 10. As it affects the sleeping periods not to harm the N.S. 11. As mass of moon is less than Earth's mass by 6times.

9 12. To connect to neighboring neurons forming synapse. 13. As it causes nervous tension and retardation. 14. As it allows movement in 1direction only. 15. As it contracts and relax generating movement. 16. As it has the ability to contract and relax. 17. Due to presence of tendons. 18. As it turns milky due to formation of calcium carbonate(insoluble) 19. As it is used in cooking, heating water, drying clothes, industry of glass.