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?

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.
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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).

Copper turns green due to oxidation

And bleaching powder loses its power due to contact with air

1 more
 

plants are producers.

My 40+ MCQs went correct. Alhamdulillah

EDS MCQs
 

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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

Big bang: cosmic rays

Non communicable disease: innate

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.