[quote=jtalpur](29) Which of the following explains the reason why there is no total eclipse of the sun?

a. Size of the earth in relation to that of moon
b. Orbit of moon around earth
c. Direction of rotation of earth around sun
[B]d. Area of the sun covered by the moon[/B]e. None of these

could anyone confirm me the answere of that question and what about option A because the size of the earth is bigger than moon soooo. wht will be the bst option[/quote]

Please see post number 1 in the following thread (question 11)

[url]http://www.cssforum.com.pk/css-compulsory-subjects/everyday-science/8527-objectives-everyday-sciences.html[/url]

The answer is at the end of the post

I have tried to find an external link for the answer
The same question appears in the [URL="http://books.google.com.pk/books?id=53hXSy0BNbEC&pg=PA137&source=gbs_selected_pages&cad=0_1#PPA138,M1"]Geography Quiz Book[/URL] by Anuj Goswami (Que No. 1541)

Unfortunately, some pages are omitted from the preview so we cannot see the answer. Maybe some senior member can help you with the external reference to the correct answer

Regards

@Mohsin
[QUOTE]Please see post number 1 in the following thread (question 11)

[URL="http://www.cssforum.com.pk/css-compulsory-subjects/everyday-science/8527-objectives-everyday-sciences.html"]http://www.cssforum.com.pk/css-compu...-sciences.html[/URL]

The answer is at the end of the post
[/QUOTE]

even this answer is wrong.
[QUOTE]
Originally Posted by [B]jtalpur[/B]
[I](29) Which of the following explains the reason why there is no total eclipse of the sun?

a. Size of the earth in relation to that of moon
b. Orbit of moon around earth
c. Direction of rotation of earth around sun
[B]d. Area of the sun covered by the moon[/B]e. None of these

could anyone confirm me the answere of that question and what about option A because the size of the earth is bigger than moon soooo. wht will be the bst option[/I]
[/QUOTE]
the best and correct answer is [SIZE=3][COLOR=teal]a) .size of the earth in relation to that of moon.[/COLOR][/SIZE]
[SIZE=3][COLOR=#008080][/COLOR][/SIZE]
[COLOR=darkslategray]this question is more of a commen sence rather of guessing.moon is much smaller than earth. The penumbra and umbra formed by moon is also small because of the small size of moon in comparison to that of formed by earth in case of lunar eclipse where total lunar eclipse is possible.[/COLOR]
hope the issue is resolved

rgds

Thank you Dr Atif

@ All

Please see the following link for 2009 EDS Answer Key (Objective Part)
[url]http://www.cssforum.com.pk/css-compulsory-subjects/everyday-science/everyday-science-notes/23727-eds-2009-a.html[/url]

Regards

@Mohsin
dear , even this key has many wrong answers, don't depend upon it solely.

[QUOTE]Originally Posted by [B]jtalpur[/B]
[I](29) Which of the following explains the reason why there is no total eclipse of the sun?

a. Size of the earth in relation to that of moon
b. Orbit of moon around earth
c. Direction of rotation of earth around sun
[B]d. Area of the sun covered by the moon[/B][/I]
[I]e. None of these
[/I][/QUOTE]

AOA
Yes, the correct answer is [B][I]d. Area of the sun covered by the moon[/I][/B]
Because the moon is too small to cover the area of sun.
[B][/B]
[B][I]Quoted from NASA Website [/I][/B]
[B][I]"[/I][/B]Were Earth's Moon farther away, no total eclipse would occur at all because the Moon would appear too [B]small to block out all of the Sun[/B]. Were the Moon much closer to the Earth, the eclipse would last much longer."
[URL="http://apod.nasa.gov/apod/ap980311.html"]http://apod.nasa.gov/apod/ap980311.html[/URL]

this article only says about the distance between earth and moon.If the moon is closer to earth there will be more solar eclipse.If the moon is farther from the earth there would be less solar eclipse.The size of the earth also matters.lets assume the earth is smaller than moon, than there will ofcourse be total solar eclipse
on the other hand if we assume that the sun is smaller then the moon, than there may be the possibility of total solar eclipse.
But I reached at a conclusion that the distance of moon frm earth is more important.

and both the answers [SIZE=3][COLOR=darkred]a[/COLOR][/SIZE] and [SIZE=3][COLOR=blue]d[/COLOR][/SIZE] may be correct.

rgds

[quote=dr.atifrana]on the other hand if we assume that the sun is smaller then the moon, than there may be the possibility of total solar eclipse.[/quote]

AOA

Its good, you admit in your post that [B][I]d. Area of the sun covered by the moon [/I][/B]is the correct answer.
If assumed, sun is smaller than moon means moon is bigger than sun means moon than cover the whole sun and formed the total solar eclipse. hence [B]d [/B]is the correct answer.

Answer
 

21 : which of the following is most elastic ?

[B]Answer : Rubber[/B]

how can we say that steel is more elastic in nature :S ??

40 : sedimentary rocks are ?

[B]Answer : porous [/B]

[quote=bunko]21 : which of the following is most elastic ?

[B]Answer : Rubber[/B]

how can we say that steel is more elastic in nature :S ??
[/quote]

Well even if [B]we[/B] do not say that steel is more elastic, the Young's Modulus says that :))

[B]Young's Modulus [/B]
Young's modulus (E) is a measure of the stiffness of an isotropic elastic material. It is also known as the Young modulus, [B]modulus of elasticity[/B], elastic modulus

For Rubber: 0.01-0.1 GPa
For Steel: 200 GPa

[B]Elasticity[/B]
It is the physical property of a material when it deforms under stress (e.g. external forces), but returns to its original shape when the stress is removed. The relative amount of deformation is called the strain.

Sory here is answer key

1. d
2. b
3. c
4. c
5. c
6. b
7.
8. a
9.
10. d
11. c
12. c
13. d
14. a
15. b
16. c
17. b
18. e
19. c
20. c
21. a
22. a
23.
24. c
25. c
26. b
27. a
28. b
29. d
30. d
31. a
32. c
33. d
34. a
35. c
36. c
37. b
38. b
39. b
40. a
41. c
42. b
43.
44. c
45. b
46. a
47. c
48. c
49. d
50. a

still not satisfied
 

Young modulus does not tell about the elasticity of substance >>>
But it states the stiffness which means rigid , inflexible and hard to bend .
of matter.

& you represented the values of stiffness of rubber and steel
such are

Rubber = .1 - .01 GPa
Steel = 200 GPa

so in your point of view diamond is more elastic than both of them ...

whose value is
Diamond = 1220 GPa

[quote=bunko]Young modulus does not tell about the elasticity of substance
But it states the stiffness which means rigid , inflexible and hard to bend .
of matter.
[/quote]

Then how do we define elasticity and how do we measure it ?

Elasticity is a measure of how well a material returns to its original shape and size i.e. it is the ratio of stress over strain. It does not mean how 'flexible' a substance is or how much it can be stretched.

And the Young's Modulus measures the resistance of a material to elastic (recoverable) deformation under load. So keeping in view the definition of elasticity, we can say that Diamond is more elastic than both of them, i.e. it has more ability to resist the elastic deformation and return to its original shape.

[QUOTE=bunko]
so in your point of view diamond is more elastic than both of them ...

whose value is
Diamond = 1220 GPa[/QUOTE]

Yes, you got it right
Diamond [B]is[/B] more elastic than both of them

Que. No. 9 Page 308
[url]http://books.google.com.pk/books?id=tvkoopJMQQ8C&pg=PA308&lpg=PA308&dq=%22Diamond+is+more+elastic%22&source=bl&ots=9j1N4eYxFk&sig=VyrQVgScB6PLv7QFO3B7oyH6F88&hl=en&ei=I3pbSuGTNsiAkQXey8jUBQ&sa=X&oi=book_result&ct=result&resnum=1[/url]

Regards

[B]Elasticity [/B]= The ability of a solid to return to its original shape or form after being subject to strain.
i do not know its measurement
you are only talking about theoretical .. just give me one practical example?

well in my mind still gobs of questions arise ...
a interesting one :P
so why don't we use steel in our trousers :D or make a world most expensive trouser by using Diamond ?

"Elasticity is a measure of responsiveness. The responsiveness of behavior measured by variable Z to a change in environment variable Y is the change in Z observed in response to a change in Y. Specifically, this approximation is common:

[B]elasticity = (percentage change in Z) / (percentage change in Y)[/B]

The smaller the percentage change in Y is practical, the better the measure is and the closer it is to the intended theoretically perfect measure."

[QUOTE=bunko]"Elasticity is a measure of responsiveness. The responsiveness of behavior measured by variable Z to a change in environment variable Y is the change in Z observed in response to a change in Y. Specifically, this approximation is common:

[B]elasticity = (percentage change in Z) / (percentage change in Y)[/B]

The smaller the percentage change in Y is practical, the better the measure is and the closer it is to the intended theoretically perfect measure."[/QUOTE]

This is not the elasticity we are talking about. This definition is for the concept of elasticity in [B]Economics[/B].

[QUOTE=bunko] you are only talking about theoretical .. just give me one practical example?

well in my mind still gobs of questions arise ...
a interesting one :P
so why don't we use steel in our trousers :D or make a world most expensive trouser by using Diamond ?[/QUOTE]

You are still confusing elasticity with flexibility, ability to get stretched etc.
that is why you are seeing difference between theory and practice. go through the definition of elasticity again, It's nothing what you think it practically is.

for everday science objective no.9
which is not the part of the darwinism....
it is the [B]inhertance of the acquired characters[/B]
the theory of the inhertance of acquired characters was given by lamarck

Marvellous Work
 

dear you did a really marvellous work. thanks for sharing it. May Allah Almighty bless you.

Eds 2009
 

Q. 8. v. Why has pasteurized milk more nutrition than ordinary boiled milk?

All milk on the market unless labelled "raw" is pasteurized. I don't believe there is boiled milk on the market. The pasteurization process however, heats the milk up to 161 degrees for about 15 seconds by squeezing it through hot pipes.

universal reciepent
 

[QUOTE=nicepunjabian;119108]Dear i think the universal receient is O+....its according to my thinking can any body confirm it[/QUOTE]

i think in my veiw it ab+.

o -ve
 

o -ve is universal recipiant

ordinary boild milk boiled at 100 celcius which lose
 

ordinary boild milk boiled at 100 celcius which lose many vitamins and protein while the pasturise milk at 72 celcius (confirm plz) for 15 seconds so it have much more preserved vit. than the other.

what about the following abbreviations?
 

DNA
cDNA
mRNA
rRNA

?????

[FONT=Verdana][QUOTE=drmkshahzed;147611]DNA
cDNA
mRNA
rRNA

?????[/QUOTE][/FONT]
[FONT=Verdana]
[/FONT]
[FONT=Verdana] [B][U]cDNA (complementary DNA) [/U][/B]
Single-stranded DNA that is complementary to messenger RNA or DNA that has been synthesized from messenger RNA by reverse transcriptase

[B][U]mRNA (messenger RNA)[/U][/B]
The template for protein synthesis; the form of RNA that carries information from DNA in the nucleus to the ribosome sites of protein synthesis in the cell

[/FONT]
[B][U][FONT=Verdana](rRNA) Ribosomal RNA [/FONT][/U][/B][FONT=Verdana][/FONT]
[FONT=Verdana]It is the central component of the ribosome, the protein manufacturing machinery of all living cells. The function of the rRNA is to provide a mechanism for decoding mRNA into amino acids and to interact with the tRNA during translation by providing peptidyl transferase activity. The tRNA then brings the necessary amino acids corresponding to the appropriate mRNA codon.[/FONT]
[FONT=Verdana]
[/FONT]

[FONT=Verdana][/FONT]
[FONT=Verdana]
[/FONT]
[FONT=Verdana]Regards,

[/FONT]

DNA --> [B]Deoxyribonucleic Acid[/B]
CDNA --> [B]Complementary Deoxyribonucleic Acid[/B] or in short Complementary DNA
RNA --> [B]Ribonucleic Acid[/B]
MRNA --> [B]Messenger Ribonucleic acid[/B] or in short Messenger RNA
RRNA --> [B]Ribosomal Ribonucleic Acid[/B] or or in short Ribosomal RNA.

Click here for there differences/more info
[url]http://answers.yahoo.com/question/index?qid=20090318082823AA1Bw4W[/url]

universal recipient is AB
 

the ans to mcq given in eveyday sci paper asking 4 universal recipient is AB+. Bcz this blood group contains two antigens A n B n none of the antibodies. whenever , there is blood transfer, donor's antigens coaggulate with receiver's antibodies, if the blood groups r not compatible. but, as there r no antibodies in AB , so there is not any agglutination n AB cn receive blood frm any group.

sorry the universal recipient is ab while the universal donor blood group is O-ve.

what is cytogenetics?

as i hv already mentioned that donor's antigens agglutinate with recipient's antibodies, same is the case here.blood group O- does not contain any antigens but contains antibodies A,B n Rh antibodies..so, O- is universal's donor.but,ab+ contains another Rh antigen, in addition 2 A,B antigens,due 2 which it is called as +(remember, ab- is the one without Rh antigen but with antibody) n also universal recipient.

Dear Brother,
Check out this answer.....


(37) Monsoon is caused by:

[B]a. Seasonal reversal of winds[/B]
b. Revolution of earth
c. Movement of clouds
d. Rise in temperature
e. Rain forests

The Correct Answer is (a- Seasonal reversal of winds causing monsoon).

[I]Monsoon, winds that changes direction with the change of seasion. It blows from the southwest, generally from April to October, and from the opposite direction, the northeast, from October to April. [/I]

u are right to an extent but actually AB positive is universal recipient as it can also recieve blood with Rh negative as well as positive..and O negative is universal donor

ans to 8 mcq is non of these as it has not been yet established whether its is sex linked or autosomal but otherwise it wud me 1/4

more over it is also not known how many allels do diabetes have as it is not completely a genetic diesease and other factors also contributethe ques here is not abt genes but the diesease so try to see it from that point of view

Oasis is related to fertile land found in Deserts... So answer would be E.

Oasis
 

Of course Oasis is related with deserts.

Blood Donor's and recipient
 

Check Out the attached file in which all the information is given regarding blood donor's and recipient.

[center][img]http://www.cssforum.com.pk/attachments/css-past-papers/css-past-papers-1971-2009/css-2009-past-papers/3613-every-day-science-paper-2009-desktop.jpg[/img][/center]

CTT means cytosine thymin thymine
AGU means Adenine guanine uracil
CAT means cytosine adenin thymine
AAT means adenine adenine thymine


Answer 7 is non of these

Get more answers:kiss
(8) What is the chance of diabetic baby born to parents both heterozygous normal ?

[B]a. [COLOR="DarkRed"]Zero [/COLOR][/B]
b. ¼
c. ½
d. ¾
e. None of these

(1) Person with following blood group are considered to be universal recipient.

a. A+
b. B+
[COLOR="Magenta"]c. AB+ [/COLOR]
d. O+
e. None of these

Very Nice thank U. 2010 ka paper b solove kr k post krein na.

O+ are Unv Doners
AB are Unv Recipents

Simple....

[B][SIZE="4"][COLOR="DarkGreen"]Full and Final Correct Answers[/COLOR][/SIZE][/B]


(1) Person with following blood group are considered to be universal recipient.

a. A+
b. B+
[B]c. AB+ [/B]
d. O+
e. None of these

(2) Study of life in outer space is known as:

a. Endobiology
[B]b. Exobiology[/B]
c. Enterobiology
d. Neobiology
e. Micro biology

(3) The name of the common mineral salt present in sweat is:

a. Calcium Oxalate
b. Potassium Sulphate
[B]c. Sodium Chloride[/B]
d. Iron Sulphate
e. None of these

(4) Sensitive layer of the eye is:

a. Choriods
b. Sclerotic
[B]c. Retina[/B]
d. Cornea
e. None of these

(5) Laughing gas has chemical composition of following two elements.

a. Nitrogen + Hydrogen
b. Nitrogen + Carbon
[B]c. Nitrogen + Oxygen[/B]
d. Oxygen + Carbon
e. None of these

(6) Dr. Abdus Salam of Pakistan was one of the contributors of the unification of:

a. Electromagnetic force and gravitational force
[B]b. Electromagnetic force and weak nuclear force[/B]
c. Gravitational force and weak nuclear force
d. Weak nuclear force and strong nuclear force
e. None of these

(7) Which triplet in DNA codes for valine:

a. CTT
b. AGU
c. CAT
d. AAT
[B]e. None of these (CAA)[/B]

(8) What is the chance of diabetic baby born to parents both heterozygous normal ?

a. Zero
[B]b. ¼[/B]
c. ½
d. ¾
e. None of these

(9) Which of the following is not a part of Darwinism:

[B]a. Over production [/B]
b. Natural selection
c. Inheritance for acquired characters
d. Competition for survival
e. None of these

(10) Role of biotechnology in the production of food based on:

a. Decomposition
b. Respiration
c. Digestion
[B]d. Fermentation[/B]
e. None of these

(11) Which form of drug abuse involves most risk of infection with the HIV (AIDS) virus:

a. Cigarette smoking
[B]b. Using alcholol[/B]
c. Injection of heroine
d. Taking too much aspirin
e. None of these

(12) Founder of modern astronomy was:

a. Archimedes
b. William Gilbert
[B]c. Nicolas Copernicus[/B]
d. Michael Faraday
e. None of these

(13) The instrument which measures very high temperature is:

a. Manometer
b. Thermostat
c. Chronometer
[B]d. Pyrometer [/B]
e. None of these

(14) The science which deals with study of manners and customs of people is:

a. Ethnology
b. Morphology
[B]c. Ethics[/B]
d. Genetics
e. None of these

(15) Chemical used to kill rats and mice are:

a. Insecticides
[B]b. Rodenticides[/B]
c. Fungicides
d. Herbicides
e. None of these

(16) Dry ice is:

a. Methane hydrate
b. Liquid Nitrogen
[B]c. Solid Carbon dioxide[/B]
d. Frozen Water
e. None of these

(17) Chemical name of vinegar is:

a. Sodium Nitrate
[B]b. Dilute acetic acid[/B]
c. Chloride of lime
d. Calcium
e. None of these

(18) Defeciency of following vitamin decreases hemoglobin production:

a. Biotin
b. Thiamine
c. Niacin
d. Pyridoxine
[B]e. None of these (Cobalamin)[/B]

(19) Hygrometer is used for measuring the:

a. Speed of sound
b. Density of milk
[B]c. Humidity of air[/B]
d. Specific gravity of liquids
e. None of these

(20) Bronze is an alloy of:

a. Copper and Zinc
b. Tin and Zinc
[B]c. Copper and Tin [/B]
d. Iron and Zinc
e. None of these

(21) Which of the following is most elastic ?

a. Steel
b. Rubber
[B]c. Glass[/B]
d. Sponge
e. None of these

(22) Orbital period of the planet Mercury around the sun is:

[B]a. 88 days[/B]
b. 365 days
c. 2 years
d. 98 days
e. None of these

(23) The most splendid and the most magnificient constellation on the sky is:

[B]a. Orion[/B]
b. Columbia
c. Canis Major
d. Taurus
e. None of these

(24) “Black holes” refer to:

a. Hole occurring in heavenly bodies
b. Bright spots on the sun
c. Collapsing objects of high density
d. Collapsing of low density
[B]e. None of these[/B]

(25) Eugenics is the study of:

[B]a. Altering human beings by changing their genetic components[/B]
b. People of European region
c. Different races of mankind
d. Genetic of plants
e. None of these

(26) The position of earth in its orbit, when it is at its greatest distance from the sun causing northern summer is called:

[B]a. Aphelion[/B]
b. Perihelion
c. Perigee
d. Apogee
e. None of these

(27) Diamond is a very expensive ornament. It is composed of a single element:

[B]a. Carbon[/B]
b. Gold
c. Silver
d. Platinum
e. None of these

(28) Which of the following layers make radio transmission possible?

a. Troposphere
[B]b. Ionosphere[/B]
c. Mesosphere
d. Stratosphere
e. None of these

(29) Which of the following explains the reason why there is no total eclipse of the sun?

[B]a. Size of the earth in relation to that of moon [/B]
b. Orbit of moon around earth
c. Direction of rotation of earth around sun
d. Area of the sun covered by the moon
e. None of these

(30) Television signals are converted into light signals by:

a. Optical fiber
b. Transistor
c. Decoder
[B]d. Photo diode (Photo and Laser Diode)[/B]
e. None of these

(31) Where do most of Asteroids lie?

[B]a. In asteroid belt between the orbits of Mars and Jupiter[/B]
b. In asteroid belt between the orbits of Mars and Venus
c. In asteroid belt between the orbits of Jupiter and Venus
d. Everywhere in the sky
e. None of these

(32) The number of spark plugs needed in a diesel engine is:

a. 2
b. 3
[B]c. 0[/B]
d. 4
e. None of these

(33) The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg?

a. 4 days
b. 12 days
c. 16 days
[B]d. 8 days[/B]
e. None of these

(34) The term ‘Blue Shift’ is used to indicate:

[B]a. Doppler effect in which an object appears bluer when it is moving towards the observer or observer is moving towards the object.[/B]
b. Turning a star from white to blue
c. In future sun would become blue
d. Black hole was blue at its start
e. None of these

(35) Kilowatt-hour is a unit of:

a. Power
b. Electric Current
[B]c. Energy[/B]
d. Time
e. None of these

(36) Fuel used in a Fast Breeder Reactor is:

a. Uranium Oxide
b. Uranium Plutonium carbide
[B]c. Uranium Plutonium Oxide[/B]
d. Uranium thorium Oxide
e. None of these

(37) Monsoon is caused by:

[B]a. Seasonal reversal of winds[/B]
b. Revolution of earth
c. Movement of clouds
d. Rise in temperature
e. Rain forests

(38) Which of the following atmospheric layers help in radio communication?

a. Exosphere
[B]b. Ionosphere[/B]
c. Troposphere
d. Stratosphere
e. Ozone layer

(39) A moderator is used in nuclear reactor in order to:

a. Accelerate the neutrons
[B]b. Slow down the speed of the neutrons[/B]
c. Increase the number of elections
d. Decrease the number of electrons
e. None of these

(40) Sedimentary rocks are:

[B]a. Porous[/B]
b. Hard
c. Rough
d. Brittle
e. Volcanic

(41) Which one of the following is a non-metallic mineral?

a. Manganese
[B]b. Magnesium[/B]
c. Gypsum
d. Bauxite
e. None of these

(42) Ozone layer prevents the following radiation from entering the atmosphere:

a. Infra-red
[B]b. Ultraviolet[/B]
c. X-rays
d. Gamma rays
e. None of these

(43) The phenomenon of Aurora Borealis, the display of red and green lights in northern hemisphere is due to radiations from:

[B]a. Ionosphere[/B]
b. Troposphere
c. Mesosphere
d. Stratosphere
e. None of these

(44) Yeast is used in making bread because it produces:

[B]a. Carbon dioxide[/B]
b. Sugar
c. Bacteria
d. Oxygen
e. None of these

(45) Oasis is associated with:

a. Glaciers
[B]b. Desert[/B]
c. Islands
d. Volcanoes
e. Fertile land

(46) Quartz crystal in quartz watches work on the principle called:

a. Photoelectric effect
b. Stark effect
c. Thermionic effect
[B]d. Piezo-electric effect[/B]
e. None of these

(47) The fruits without seed, like banana, are called:

a. seedless fruits
b. parthenogenesis fruits
[B]c. parthenocarpic fruits [/B]
d. placental fruits
e. Organic fruits

(48) Animal which captures and readily kills living animals for its food is called:

a. Parasite
b. Scavenger
[B]c. Predator[/B]
d. Mammal
e. None of these

(49) In a railway track, two rails are joined end to end with a gap tin between them because:

a. Steel can be saved
b. Accidents due to contraction in winter can be avoided
c. Air gaps are necessary for bearing the weight of running train
[B]d. Accidents due to expansion in summer can be avoided[/B]
e. All of these

(50) Name the famous book of Ibn-Sina in which he discussed human physiology and medicine:

[B]a. Al-Qanoon (The Canon of Medicine) [/B]
b. Al-Masudi
c. New Renaissance
d. Tadhkira
e. None of these

Abbreviations
 

(1) SONAR - sound navigation and ranging
(2) CNS - central nervous system
(3) PTFE - poly tetra flouro ethylene
(4) LDL - low density lipoprotein
(5) SARS - severe acute respiratory syndrome
(6) GUT - grand unified theory
(7) BASIC - beginners all purpose symbolic instruction code
(8) BTU - british thermal unit

I was going through the past papers, I have found this thread to be very helpful but there are a few obvious mistakes here and there, in Mosavir's attempt I'm pointing out the ones about which I am cent percent sure...

(9) Which of the following is not a part of Darwinism:

a. Over production
b. Natural selection
[B]c. Inheritance for acquired characters[/B] [I]Lamarck proposed this theory[/I]
d. Competition for survival
e. None of these

(11) Which form of drug abuse involves most risk of infection with the HIV (AIDS) virus:

a. Cigarette smoking
b. Using alcholol
[B]c. Injection of heroine[/B]
d. Taking too much aspirin
e. None of these

(21) Which of the following is most elastic ?

[B]a. Steel [/B] [I]glass would never come back to its original form[/I]
b. Rubber
c. Glass
d. Sponge
e. None of these

(24) “Black holes” refer to:

a. Hole occurring in heavenly bodies
b. Bright spots on the sun
[B]c. Collapsing objects of high density[/B] [I]please correct me if I am wrong[/I]
d. Collapsing of low density
e. None of these

(41) Which one of the following is a non-metallic mineral?

a. Manganese
b. Magnesium
[B]c. Gypsum[/B]
d. Bauxite
e. None of these