Salaam,
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(c) The organ in the human body which is responsible for the digestion of protein only
Digestive Enzymes
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Well i think that small intestines( the area of "ilium") are responsible for the absorption of proteins in the body.
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(h) Horse power is the unit of mechanical energy.
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False. It is a unit of power, since 1 horsepower = 720 watts.
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8. Differentiate between the following pairs. (2 each)
(a) Radiotherapy & Chemotherapy (b) Penumbra & Umbra (c) Springtides &
Neaptides
(d) Vertebrates &. Invertebrates (e) Fluorescent light & Neon signs
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(a) Radiotherapy & Chemotherapy Well, radiotherapy uses the radio waves and the chemotherapy uses the chemicals.
(c) Springtides & NeaptidesWhen the gravitational effects of the Sun and the Moon combine, we get
spring tides, which have nothing to do with the season of spring. The term refers to the action of the seas springing out and then springing back. These are times of high high tides and low low tides.When the Sun and Moon are at right angles to each other and their tidal influences partially cancel each other out,
neap tides occur, and the tidal range is minimal.
(d) Vertebrates &. Invertebrates The animals which possess the vertebral column are known as
vertebrates and the ones which dont are known as
invertebrates
(e) Fluorescent light & Neon signs The Fluorescent lights are charged up with gases which omit light by either temperature increase or electrical conduction, while the neon signs are made up of neon lights, which uses Neon gas as a fluorescent medium.
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9. Fill in the blanks: (1 each) '
a)The variation in the blood flow can be heard with an instrument called __
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Stethoscope
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b)There is a place in the retina where the light sensitive cells are interrupted by the presence of the optic nerve head. It is known as __
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Blind spot
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(e) defect of eye due to which nearly located objects arc not clearly visible is called __ .
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Hypermetropia
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(g) All of the oxygen that you breathe has been produced by the splitting of water during __ ___.
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Photosynthesis
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(i) _ __ acid was discovered by Jabbar bin Hayyan.
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Sulphuric acid.
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11 . Give scientific reason of the following: (2 each)
(1) Pole star is always seen in the north.
(2) We never see birds urinating.
(3) Pasteurized milk has more nourishment than the ordinary boiled milk.
(4) Bees die when they sting human beings.
(5) Cloudy nights are usually warmer than the clear ones.
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1- Because the earths motion is from east to west and not from south to north, around its own axis.
2- I dont know
3- Because it is heated for a very short time, which not only kills the microbes but also prevents the delicate proteins and vitamins to loose.
4- Nice description by Impossible
5- Because the clouds form an attic over and entraps the air. This prevents to the heat to get lost in the atmosphere, above the clouds. Ultimately, the heat produced in the vicinity is restored.
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Name the devices which convert
(1) Mechanical energy into electrical energy
(2) Heat energy into mechanical energy
(3) Electrical energy into mechanical energy
(4) Electrical energy into sound energy
(5) Sound energy into electrical energy
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1- Electric Generator/Dynamo
2- Combustion Engines
3- Electric motors
4- Speakers
5-Microphone
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15. Choose the best choice in the following statements.
(I) Select the correct association :
(a) Oxidation-Loss of an electron (b) Oxidation - gain of an electron (c) Reduction - gain of a neutron (d) Reduction - loss of a neutron
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(b) Oxidation - gain of an electron
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(3) Human population growth is greatest in developing countries because:
(a) the birth rate is high in developing countries (b) the death rate is high in developing countries
(c) much of the population has already reached the child bearing age
(d) most of the world's population lives in industrialized countries
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(a) the birth rate is high in developing countries
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(5) Rectified spirit contains alcohol about:
(a) 80% (b) 95% (c) 70%
(d) 85%
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(b) 95%
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(6) Which of the following elements is not present abundantly in earth's crust: (a) Silicon (b) Radium (c) Aluminum
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(b) Radium
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(7) The famous book; Al - Qanoun was written by the Muslim scientist: (a.) Jabar bin Hayyan (b) Zakariya Al - Razi (c) Abu Ali Sina(d) Abdul Qasim Majreeti
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(c) Abu Ali Sina
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(8) Basic metals can be converted into gold by:
(a) heating (b) beating (c) artificial nuclear radioactivity(d) chemical reaction
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(c) artificial nuclear radioactivity
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(9) A light year is a unit of:
(a) time (b) energy (c) length (d) mass
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(c) length
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(10) One of the main function of the earth's ozone layer is to:
(a) prevent global warming (b) filter out ultraviolet rays (c) absorb pollution (d) all of the above
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(b) filter out ultraviolet rays
and also :
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(e) The scientist who designed the first internal combustion engine used to burn low grade fuel.
Etienne Lenoir
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Well my dear, Etienne Lenoir invented the gas engine, while the low grade fuel (Diesel oil etc) engine was first invented by the german scientist named as Rudolf Diesel. After him, the oil was named as Diesel and the engines were known as the Diesel Engines.He also managed to run the engine with peanut oil.
Take Care