Thursday, March 28, 2024
04:33 PM (GMT +5)

Go Back   CSS Forums > CSS Compulsory Subjects > General Science & Ability

Reply Share Thread: Submit Thread to Facebook Facebook     Submit Thread to Twitter Twitter     Submit Thread to Google+ Google+    
 
LinkBack Thread Tools Search this Thread
  #111  
Old Wednesday, February 22, 2012
Senior Member
 
Join Date: Nov 2010
Posts: 107
Thanks: 21
Thanked 86 Times in 53 Posts
chemguy will become famous soon enough
Default

35) Kilowatt hour is unit of

a) Power
(The unit of electric current is Ampere)

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

I think it should be (a) Over production. Because if over production were part of evolution, then the notion of 'survival of the fittest' would be wrong. Plus Darwinism doesn't forgo inheritance of characteristics, it in fact depends on it because the species which are most likely to survive, inherit those superior characteristics from their parents.
I am not 100% certain myself, anyone else agree with me?
Reply With Quote
The Following User Says Thank You to chemguy For This Useful Post:
Pakistaniguy (Wednesday, February 22, 2012)
  #112  
Old Wednesday, February 22, 2012
Senior Member
 
Join Date: Nov 2010
Posts: 107
Thanks: 21
Thanked 86 Times in 53 Posts
chemguy will become famous soon enough
Default @Xaara

23. The building blocks of elements are called:
a) Atoms

Because except for a handful of gases that can only exist as molecules (Oxygen, Hydrogen, Nitrogen, Chlorine) , all other elements are composed of atoms. Molecules are building blocks of compounds not elements.

27) If an alkali is slowly added to an acidic solution, the pH of the acidic solution will:
d) Decrease to 7 and then increase

A is not right because adding alkali will lower pH of acidic solution.

31) Information can be sent over long distances in the form of:
Can you explain this, I am sceptical.

10. When a ray of sunlight enters a dark room , its straight path become visible because of dust particles hanging in the air. It is because light is :
Light itself is invisible. You can see things clearly in presence of light, can't you? Had light been visible our view would have been murky at least :P
b)Transparent
Reply With Quote
The Following User Says Thank You to chemguy For This Useful Post:
Pakistaniguy (Wednesday, February 22, 2012)
  #113  
Old Wednesday, February 22, 2012
xaara~hussain's Avatar
Senior Member
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason:
 
Join Date: Oct 2005
Location: Islamabad
Posts: 722
Thanks: 702
Thanked 852 Times in 370 Posts
xaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of light
Default

wait for my answers
Reply With Quote
  #114  
Old Wednesday, February 22, 2012
xaara~hussain's Avatar
Senior Member
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason:
 
Join Date: Oct 2005
Location: Islamabad
Posts: 722
Thanks: 702
Thanked 852 Times in 370 Posts
xaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of light
Default

(35) Kilowatt-hour is a unit of:

a. Power
b. Electric Current
c. Energy
d. Time
e. None of these



ok, Kilowatt hour is the unit of electricity consumed in homes, I confused it with electric current. but it is a unit of energy basically, not power. WATT is the unit of power. so correct answer is energy.

*The kilowatt hour, also written kilowatt-hour,
(symbol kW·h, kW h or kWh) is a unit of energy.
*It is most commonly used to express amounts of energy delivered by electric utilities, and it appears on electric meters and bills in some countries.

*The kilowatt hour is a measure of work, the watt is a measure of power. The amount of wattage times the amount of time is the amount of work done.

*It is not used in the International System of Units (SI). The SI unit of energy is the joule (J), equal to one watt second. The kilowatt hour is commonly used, though, especially for measuring electric energy.
Reply With Quote
The Following User Says Thank You to xaara~hussain For This Useful Post:
multithinker (Friday, December 21, 2012)
  #115  
Old Wednesday, February 22, 2012
xaara~hussain's Avatar
Senior Member
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason:
 
Join Date: Oct 2005
Location: Islamabad
Posts: 722
Thanks: 702
Thanked 852 Times in 370 Posts
xaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of light
Default

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

a. Over production
b. Natural selection
c. Inheritance for acquired characters (I am 1000% sure about it)
d. Competition for survival
e. None of these

The inheritance of acquired characteristics is a hypothesis that physiological changes acquired over the life of an organism (such as the enlargement of a muscle through repeated use) may be transmitted to offspring.

It is also commonly referred to as the theory of adaptation equated with the evolutionary theory of French naturalist Jean-Baptiste Lamarck known as Lamarckism.


so, it is definitely not a part of Darwinism.

natural selection and competition of fittest to hai he.
so
over production is left.

now have a look

Darwin's Theory of Natural Selection

Darwin's Finches

Charles Darwin visited the Galapagos Islands in 1835. There he observed many of the animal species that he had seen on the South American continent. However, he noticed that while the animals resembled the continental species there were distinct variations that made survival on the Galapagos Islands possible. This inspired the Theory of Natural Selection.

As he traveled from island to island, Darwin noticed that finches on each island had unique bill adaptations that allowed them to take advantage of the food sources of each island. Darwin proposed that the finches had all arrived on the islands at the same time, presumably as members of the same flock blown off course by a storm. There they were able to survive because within the original group there were bill variations that allowed each finch to establish an ecological niche and take advantage of different ways of life. Finches best suited for survival on each island produced offspring with the same bill variation. Overtime, the finches diverged from the original ancestral finch line and became 14 new finch species.

Today, Darwin's finches are found only on the Galapagos Islands with one species on the Cocos Island. They are differentiated from each other by the variations in their bills. What is unusual is that mainland finches are usually distinguished from each other by variations in plumage not body form.

There are few bird species on the Galapagos Islands. When the original finches arrived on the islands, they met little competition and were able to exploit the ecological niches available on each island. Ground finches have stout, strong bills that are good for cracking seeds. Tree finches have pointed bills and eat insects from under tree bark. Another type of finch has a woodpecker-like bill that drills into wood for insects. Unlike, the woodpecker, the finch has a short tongue, so it uses a twig to pull out the insect. Some are able to use cactus needles for this purpose.

The finches have two main predators: the Galapagos hawk and short-eared owl. With human introduction of domestic cats, the ground finches have been vulnerable to attack from this new predator. For the most part, the finches were able to adapt to the island food supply with little threat from predators. They also developed in isolation. This is a necessary condition for changes to take place that lead to new species.

Parts of the Theory

I. Variation within a Species

In his studies, Darwin noticed that individuals shared characteristics common to a species, but within a species there could be individual variation. These variations are the result of subtle differences in the genes of individuals. Slight changes in the DNA of an individual can occur through mutation. He speculated that while some mutations might be harmful, others might be beneficial and give an organism a selective advantage in survival.

II. Overproduction of Offspring


Darwin also observed that many species produce far more eggs or seeds than could ever develop into adults and be supported by the ecosystem. For example, a single female horseshoe crab may 100,000 eggs during the breeding season, but only 1 in 130,000 eggs survives to adulthood. Many eggs are lost to predators before they ever hatch. Predators also thin out hatchlings as soon as they reach the ocean waters. Darwin speculated that the overproduction of offspring was necessary to ensure that there would be enough adults to continue the species.

III. Struggle for Survival

Darwin observed that members of the same species competed for food, water, shelter, space, and mates. Those individuals best suited for survival had an advantage during harsh conditions or competition for scarce necessities. Darwin noticed that on the Galapagos Islands tortoise populations included individuals with long necks and short necks. During times of adequate rainfall, vegetation was available for both types of tortoises. However, in dry conditions, tortoises with long necks were favored for survival since they could reach leaves that were higher off the ground. Therefore, their variation was better adapted to the environmental conditions and led to survival.

IV. Natural Selection


Finally, individuals whose characteristics were best suited for survival were the most likely to achieve adulthood and reproduce. Through reproduction, the individual's genes were passed onto the next generation. Over time, in isolation, a new species might arise. This is how Darwin explained the 14 different species of finches who were differentiated by their beak type from one another, but who otherwise each strongly resembled an extinct ancestral finch from the South American mainland. This is called adaptive radiation and will be covered in detail in high school biology.

source: http://www.angelfire.com/nj3/mrschen/darwin.htm

so, please don't rectify a mistake if you yourself have not investigated enough. only guess-work based reasoning doesn't prove fruitful. other candidates can be confused.
Reply With Quote
The Following User Says Thank You to xaara~hussain For This Useful Post:
chemguy (Wednesday, February 22, 2012)
  #116  
Old Wednesday, February 22, 2012
xaara~hussain's Avatar
Senior Member
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason:
 
Join Date: Oct 2005
Location: Islamabad
Posts: 722
Thanks: 702
Thanked 852 Times in 370 Posts
xaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of lightxaara~hussain is a glorious beacon of light
Default

Quote:
Originally Posted by chemguy View Post
23. The building blocks of elements are called:
a) Atoms

Because except for a handful of gases that can only exist as molecules (Oxygen, Hydrogen, Nitrogen, Chlorine) , all other elements are composed of atoms. Molecules are building blocks of compounds not elements.

27) If an alkali is slowly added to an acidic solution, the pH of the acidic solution will:
d) Decrease to 7 and then increase

A is not right because adding alkali will lower pH of acidic solution.

31) Information can be sent over long distances in the form of:
Can you explain this, I am sceptical.

10. When a ray of sunlight enters a dark room , its straight path become visible because of dust particles hanging in the air. It is because light is :
Light itself is invisible. You can see things clearly in presence of light, can't you? Had light been visible our view would have been murky at least :P
b)Transparent
ok u maybe right in first two, as I am not chem girl u knw

but about that information MCQ, i am not sceptical about fibre optics. I am sure about it. They are most widely used for communication purposes now a days, and light is used in fibre optics.

and moreover, wires are not practical for long distances (think globally), and radio waves would be too weak to go so far carrying information.


about light being visible, it is a little tricky.

Transparent is a medium to allow light pass through it. Light itself cannot be transparent. It is visible to our eye, that is why it is visible in a dark room too! but it is tricky. I can't be sure.
Reply With Quote
  #117  
Old Wednesday, February 22, 2012
Senior Member
 
Join Date: Nov 2010
Posts: 107
Thanks: 21
Thanked 86 Times in 53 Posts
chemguy will become famous soon enough
Smile Thanks alot!

Out of the 6 that I pointed, I was wrong on 3 accounts and so were you. That makes us even

Quote:
so, please don't rectify a mistake if you yourself have not investigated enough. only guess-work based reasoning doesn't prove fruitful. other candidates can be confused.
Well aren't you happy that this little discussion cleared concepts for both of us? And possibly saved us from some future embarassment? It certainly did for me with your KwH explanation


I mistook "Inheritance for acquired characters " for inheritance in general sense of word. As for over production, I distinctly remember not finding this concept anywhere in Darwin's Origins of Species. One would think Darwin would've included this in his book . Nevertheless you are are right about this MCQ.

Concerning the means to send information, I was thinking of option "a combination.." because it'd better to lay fiber optic wires locally and for intercontinental communication, some form of radio signals.

As for light, the only reason we see objects is because light reflects off of them. Light itself is transparent. It'd be nice to have some source to ascertain this. I gave away the book in which I had read this
Reply With Quote
The Following User Says Thank You to chemguy For This Useful Post:
xaara~hussain (Wednesday, February 22, 2012)
  #118  
Old Saturday, February 25, 2012
Junior Member
 
Join Date: Feb 2012
Posts: 9
Thanks: 1
Thanked 8 Times in 5 Posts
amber farman ellahi is on a distinguished road
Default

u r good.just keep it up
Reply With Quote
The Following User Says Thank You to amber farman ellahi For This Useful Post:
xaara~hussain (Saturday, February 25, 2012)
  #119  
Old Sunday, February 26, 2012
Farrah Zafar's Avatar
Makhzan-e-Urdu Adab
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason: Diligent Service Medal: Awarded upon completion of 5 years of dedicated services and contribution to the community. - Issue reason:
 
Join Date: May 2010
Location: امید نگری
Posts: 2,362
Thanks: 2,346
Thanked 4,047 Times in 1,576 Posts
Farrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud of
Default

Quote:
Originally Posted by xaara~hussain View Post


19. Cusec is a unit of :

a) Area
b) Time
c) Distance
d) mass
e) None of these
Cusec is unit for volume flow rate

So it must be none of these.

Measurement unit conversion: cusec



Quote:
48. The most abundant element present is in the human body is :

a) Nitrogen
b) Oxygen
c) Carbon
d) Hydrogen
e) None of these
It's Oxygen.

Elements in the Human Body - The Free Information Society
__________________
Love is my Shield,Truth is my Sword,Brain is my Crown,Smile is my Treasure and I'm a Queen;
Quitters never win and Winners never quit..!!!
Reply With Quote
The Following User Says Thank You to Farrah Zafar For This Useful Post:
multithinker (Friday, December 21, 2012)
  #120  
Old Friday, April 06, 2012
Senior Member
 
Join Date: Feb 2012
Location: Quetta
Posts: 221
Thanks: 267
Thanked 29 Times in 24 Posts
prince93 is on a distinguished road
Default

its not alpha its gamma radiations which are not affected by Magnetic Field.......
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
English Grammar (Beginner`s Classes) Sureshlasi Grammar-Section 53 Thursday, January 20, 2022 09:10 PM
Lets solve IR MCQs from the past papers dr.atifrana International Relations 38 Monday, March 08, 2021 03:54 PM
development of pakistan press since 1947 Janeeta Journalism & Mass Communication 15 Tuesday, May 05, 2020 03:04 AM
Guide to Grammar and Writing Faryal Shah Grammar-Section 18 Wednesday, February 13, 2013 11:13 PM


CSS Forum on Facebook Follow CSS Forum on Twitter

Disclaimer: All messages made available as part of this discussion group (including any bulletin boards and chat rooms) and any opinions, advice, statements or other information contained in any messages posted or transmitted by any third party are the responsibility of the author of that message and not of CSSForum.com.pk (unless CSSForum.com.pk is specifically identified as the author of the message). The fact that a particular message is posted on or transmitted using this web site does not mean that CSSForum has endorsed that message in any way or verified the accuracy, completeness or usefulness of any message. We encourage visitors to the forum to report any objectionable message in site feedback. This forum is not monitored 24/7.

Sponsors: ArgusVision   vBulletin, Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.