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  #11  
Old Thursday, January 04, 2007
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is there any one from karachi who can join me for preparation of css 2007.here some of these questions solved were not correct by all accounts ,so i needed a real person to study heres my number feel free to contact..03212935696
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  #12  
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is there any body who could solve this please:

Q.11(4)Css2005.Bees die when they sting human beings.
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  #13  
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is there any body who can solve the (scientific reasons)of previous papers
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Old Thursday, January 04, 2007
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Quote:
Bees die when they sting human beings.
Their stingers are actually ovipositors, tubular structures extending from the abdomen that sometimes contain eggs. When the barbed stinger is left inside the victim, the honeybee mortally tears her abdomen in the process. Alas, she dies.
However, that only female honeybees die after stinging. Fortunately, honeybees are relatively docile, and only commit suicidal acts when provoked. And they only die if they sting a mammal, because of the thickness of our skin. They can sting other insects with impunity. A valve-and-piston motion causes the stinger to both sink itself into your skin, as well as pump venom through the tiny lancets. Also, an "alarm pheromone" secreted at the base of the stinger causes other bees in the vicinity to get riled up.

Fortunately, only about one out of a hundred people are allergic to bee stings, but allergic reactions can be very serious.
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is there any body who can solve the (scientific reasons)of previous papers
http://www.cssforum.com.pk/css-past-...er-2006-a.html

u may check the link to chek the work we have done on 2006 paper.

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  #16  
Old Monday, January 08, 2007
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Salaam,

Quote:
(c) The organ in the human body which is responsible for the digestion of protein only
Digestive Enzymes
Well i think that small intestines( the area of "ilium") are responsible for the absorption of proteins in the body.

Quote:
(h) Horse power is the unit of mechanical energy.
False. It is a unit of power, since 1 horsepower = 720 watts.

Quote:
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
(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 __
Stethoscope
Quote:
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 __
Blind spot

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(e) defect of eye due to which nearly located objects arc not clearly visible is called __ .
Hypermetropia

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(g) All of the oxygen that you breathe has been produced by the splitting of water during __ ___.
Photosynthesis

Quote:
(i) _ __ acid was discovered by Jabbar bin Hayyan.
Sulphuric acid.

Quote:
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.
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
1- Electric Generator/Dynamo
2- Combustion Engines
3- Electric motors
4- Speakers
5-Microphone

Quote:
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
(b) Oxidation - gain of an electron

Quote:
(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
(a) the birth rate is high in developing countries

Quote:
(5) Rectified spirit contains alcohol about:

(a) 80% (b) 95% (c) 70%

(d) 85%
(b) 95%

Quote:
(6) Which of the following elements is not present abundantly in earth's crust: (a) Silicon (b) Radium (c) Aluminum
(b) Radium

Quote:
(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
(c) Abu Ali Sina

Quote:
(8) Basic metals can be converted into gold by:

(a) heating (b) beating (c) artificial nuclear radioactivity(d) chemical reaction
(c) artificial nuclear radioactivity

Quote:
(9) A light year is a unit of:

(a) time (b) energy (c) length (d) mass
(c) length

Quote:
(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
(b) filter out ultraviolet rays

and also :
Quote:
(e) The scientist who designed the first internal combustion engine used to burn low grade fuel.
Etienne Lenoir
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.

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  #17  
Old Monday, January 08, 2007
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And yes,
HDL, aslo stands for High Density Lipoproteins.
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  #18  
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And also, the symbol for capacitance is "C", but for Farad, it is "F"
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  #19  
Old Thursday, February 22, 2007
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Default Bees die when they sting human beings.

The answer by the dear friend is little in correct
the correct answer is
The worker bee's stinger is a complex organ that allows a bee to defend itself and the hive from most mammals. Typically, the stinger can be used only once in an act of defense, known as a bee sting, as it becomes forever detached from the bee in the process. Upon delivering the stinger, the bee will subsequently die from dehydration, since the portion where the stinger bulb was removed becomes raw and exposed. The impending doom of death for such a bee can be justified by well known principles of evolution. Nevertheless, in the evolutionary context, the survival of the individual worker bee is not significant, since they do not directly contribute to the survival of the colony's genes and genetic transmission is achieved by other means.
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  #20  
Old Saturday, February 24, 2007
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there were two mistakes i noticed while going through every day science threads, i dont know if someone had corrected them later .there was a question abut first living being on earth n a forum member had chosen it to be virus where as scientific research has proved it to be a bacteria, cuz virus requires a host to live on n to be the first ever living being on earth how could it find another being to survive on?
other question was abt structure of cell membrane , its composed of lipo-proteins, on the forum only one component had been chosen.
corect me if i am wrong.
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