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adnan khan Friday, February 28, 2014 09:17 AM

2 more MCQs
 
Bleaching powder loses its power due to?
a) moisture in air
b) with time


The color of Copper becomes green due to?

HUNK007 Friday, February 28, 2014 12:42 PM

copper turns green because of corrosion
 
Why Does Copper Turn Green?
Andrea Thompson, OurAmazingPlanet Managing Editor | February 09, 2013 02:17pm ET

Lifeslittle
metal, metals, copper, patina
Pin It Copper turns green because of chemical reactions with the elements.
Credit: USGS.
View full size image
For the same reason that iron rusts.

Just as iron that is left unprotected in open air will corrode and form a flaky orange-red outer layer, copper that is exposed to the elements undergoes a series of chemical reactions that give the shiny metal a pale green outer layer called a patina.

The patina actually protects the copper below the surface from further corrosion, making it a good water-proofing material for roofs (which is why the roofs of so many old buildings are bright green).

adnan khan Friday, February 28, 2014 01:53 PM

Copper turns green due to oxidation

And bleaching powder loses its power due to contact with air

HUNK007 Friday, February 28, 2014 04:44 PM

1 more
 
plants are producers.

rocksever Friday, February 28, 2014 04:59 PM

My 40+ MCQs went correct. Alhamdulillah

Adeel Ahmed Friday, February 28, 2014 05:40 PM

EDS MCQs
 
[URL="https://www.facebook.com/groups/246242558882555/"]eds mcqS 2014 SOLVED BY MIAN SHAFIQ IN FACEBOOK[/URL]

philosopherking Friday, February 28, 2014 10:49 PM

EDS 2014 MCQs Solved
 
1. The echo of Big Bang can be heard in the form of:
a. cosmic rays
b. gamma rays
[B]c. microwave radio signals [/B]
d. infrared radiations

2. Omar Khyyam was a:
a. poet
b. mathematician
c. astronomer
[B]d. all of these[/B]

3. Who was the early dentist and also inventor of many surgical instruments:
a. Avicenna
[B]b. Al. zahrawi[/B]
c. Ibn .ul. haithem
d. Al . Jahiz

4. who was the first Muslim mathematician who used '' Zero '' :
a. Ibn. e. Baitar
b. Ibn. Rushd
c. Ibn. Al. Haitham
[B]d. Al Khwarizmi[/B]

5. Why some nebulae shine?
a)because they emit light
b)due to burning process
c)because they contain bright stars
[B]d)because they reflect light[/B]

6. A shooting star is
a)sun
b) a comet
[B]c) a meteor[/B]
d) an asteroid

7. A 'clinical death' takes place when:
a) there is no pulse
b) there is no heart beat
c)pupils are fixed and dilated and there is no reaction to light
[B]d) all of above[/B]

8. What is Hubble Classification :
a. classification of stars
b. classification of planets
[B]c. classification of galaxies [/B]
d. classification of earth's zones

9. Sun rises in the east and sets in the west due to the:
a. shape of earth
b. rotation of earth around the sun
[B]c. rotation of earth on its axis [/B]
d. movement of the sun

10. What are cyclones?
a. sudden heavy floods
b. no rain for a long period
c. heavy showers
[B]d. violent wind and rain[/B]

11. From ecological point of view human beings are taken as:
a. decomposers
[B]b. consumers’[/B]
c. producers
d. All of these

12. The major cause of land pollution is:
a) pesticides
b) chemical fertilizers
c) insecticides
[B]d) all of these[/B]

13. The sharp-bitter taste of unripe fruits is due to high concentration of:
a)phenolic compounds
b)volatile compounds
[B]c)organic acids[/B]
d)starch

14. The use of antibiotic is a very effective way of killing disease causing bacteria. Sometime people don't finish all of their pills. this can result in:
a) some bacteria left unkilled
b) production of more bacteria
c) bacteria becoming sensitive to antibiotics
[B]d) bacteria becoming resistant to antibiotics[/B]

15. Flesh eaters are called:
a)omnivores
[B]b) carnivores[/B]
c) herbivores
d) scavengers

16. Chromosomes are made up of:
[B]a) DNA only[/B]
b) DNA & RNA
c) Proteins only
d) DNA RNA & Proteins

17. Plants can be made disease resistant by:
a)heat Treatment
b)hormone treatment
c)colchicine treatment
[B]d)breeding with their wild relatives[/B]

18. Important ingredient used in vicks vapor rub is obtained from the plant:
a) Cinamomum camphora
b) cinamomum zelamicum
c) Curaima longa
[B]d) All of these[/B]

19. Which of the following is both endocrine and exocrine gland:
a) thyroid
[B]b) pancreas[/B]
c) parathyroid
d) all of these

20. The process by which small amount of impurities are added into a semiconductor is called:
a) addition
b) conduction
[B]c) doping[/B]
d) insulating

21. Which of the following is a semiconductor?
a) Mercury
[B]b) magnesium[/B]
c) silver
d) none of these

22. Silver fish belongs to:
a) fish
[B]b) insect[/B]
c) reptile
d) amphibian

23. Satiety is the condition in which patient lacks desire to:
a. drink
[B]b. eat [/B]
c. sleep
d. talk

24. Function of iron in our body is:
a. provide strength
[B]b. oxygen transport[/B]
c. help in hydrolysis
d. breakdown fats

25. The non- communicable disease is called:
[B]a. Endemic[/B]
b. Acute
c. Chronic
d. Innate

shamskhan6789 Saturday, March 01, 2014 10:57 AM

Big bang: cosmic rays

shamskhan6789 Saturday, March 01, 2014 10:57 AM

Non communicable disease: innate

mhz99 Saturday, March 01, 2014 11:05 AM

Afterglow of big bang has been cooled by the expansion of the Universe to just 2.725 degree above absolute zero – the lowest possible temperature – so it appears not as visible light but stretched out into short-wavelength radio waves, principally microwaves.


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