The Date Sheet of CBSE Class XII 2011 was released today, on 7th, January,2011.
The main subjects are as follows:
All exams start at 10:30 AM. Subject codes in parenthesis.
Here's the copy of the original file CBSE uploaded (Click here):
Science (Biology) Stream
March 1, Tuesday: Physics (042)
March 7, Monday: Chemistry (043)
March 11, Friday: English Core (301)
March 14, Monday: Biology (044)
March 22, Tuesday: Mathematics (041)
Science (Computer) Stream
March 1, Tuesday: Physics (042)
March 7, Monday: Chemistry (043)
March 11, Friday: English Core (301) March 22, Tuesday: Mathematics (041)
March 30, Wednesday: Computer Science (083)
Commerce Stream
March 3, Thursday: Business Studies (054)
March 9, Wednesday: Accountancy (055)
March 11, Friday: English Core (301)
March 16, Wednesday: Economics (030)
March 30, Wednesday: Informatics Practices (065)
Showing posts with label class12. Show all posts
Showing posts with label class12. Show all posts
Friday, January 7, 2011
Monday, November 1, 2010
KVPY Class XII SB(+2)/SX 2010 Questions and Answers
The KVPY 2010 question papers (SA, SB/SX) are provided below.
The KVPY 2010 answer keys (SA, SB/SX) are provided below.
Here's my attempt at answering KVPY Question Paper of Stream SB/SX conducted on October 31, 2010. The answers may or may not be right. Verify the logic on your own.
PART-I (Answer any three sections. One mark for right answers, -0.25 for wrong answers)
MATHEMATICS
PHYSICS
CHEMISTRY
BIOLOGY
PART-II (Answer any two sections. Two marks for right answers, -0.5 for wrong answers)
MATHEMATICS
PHYSICS
CHEMISTRY
110 A solution containing 8.0 g of nicotine in 92 g of water freezes 0.925 degrees below the normal freezing point of water. If the molal freezing point depression constant Kf = 1.85°C mol-1 then the molar mass of nicotine is
A. 16
B. 80
C. 320
D. 160
The depression is half the freezing point depression constant. So, there must be 0.5 moles. Now the unit given in the question seems to be wrong. The unit for molal freezing point depression must be °C kg mol-1. So, keeping that in mind, the molality of the solution is 0.5 mole per kg. That is, in 100g, there is 0.05 moles which is 8 g. 16 g in 0.1 moles and 160 g for 1 mole.
BIOLOGY
111: A host cell has intracellular bacterial symbionts. If the growth rate of the bacterial symbiont is always 10% higher than that of the host cell, after 10 generations of the host cell the density of bacteria in host cells will increase
A. by 10%
B. two-fold
C. ten-fold
D. hundred-fold
This is intracellular symbiont. Imagine there is one symbiont in one cell. So, when that host cell becomes 10, the total number of symbionts becomes 11, that is 1.1 per cell. (in one generation) Similarly when it becomes 100 in the next generation, the symbionts become 121. (1.2 per cell) Going on, in the 10th generation, it'll reach around 2.5 per cell which I rounded as two-fold.
112 In a diploid organism, there are three different alleles for a particular gene. Of these three alleles one is recessive and the other two alleles exhibit co-dominance. how many phenotypes are possible with this set of alleles?
A. 3
B. 6
C. 4
D. 2
This is nothing other than how the blood groups are. There is three different alleles, A, B and i. i is recessive, A and B exhibit co-dominance. And we have: AB, A, B and O phenotypes
| • | SA Part A |
| • | SA Part B |
| • | SB/SX |
| • | SA, SB, SX |
| • | SA Part B |
Here's my attempt at answering KVPY Question Paper of Stream SB/SX conducted on October 31, 2010. The answers may or may not be right. Verify the logic on your own.
PART-I (Answer any three sections. One mark for right answers, -0.25 for wrong answers)
MATHEMATICS
PHYSICS
CHEMISTRY
BIOLOGY
PART-II (Answer any two sections. Two marks for right answers, -0.5 for wrong answers)
MATHEMATICS
PHYSICS
CHEMISTRY
110 A solution containing 8.0 g of nicotine in 92 g of water freezes 0.925 degrees below the normal freezing point of water. If the molal freezing point depression constant Kf = 1.85°C mol-1 then the molar mass of nicotine is
A. 16
B. 80
C. 320
D. 160
The depression is half the freezing point depression constant. So, there must be 0.5 moles. Now the unit given in the question seems to be wrong. The unit for molal freezing point depression must be °C kg mol-1. So, keeping that in mind, the molality of the solution is 0.5 mole per kg. That is, in 100g, there is 0.05 moles which is 8 g. 16 g in 0.1 moles and 160 g for 1 mole.
BIOLOGY
111: A host cell has intracellular bacterial symbionts. If the growth rate of the bacterial symbiont is always 10% higher than that of the host cell, after 10 generations of the host cell the density of bacteria in host cells will increase
A. by 10%
B. two-fold
C. ten-fold
D. hundred-fold
This is intracellular symbiont. Imagine there is one symbiont in one cell. So, when that host cell becomes 10, the total number of symbionts becomes 11, that is 1.1 per cell. (in one generation) Similarly when it becomes 100 in the next generation, the symbionts become 121. (1.2 per cell) Going on, in the 10th generation, it'll reach around 2.5 per cell which I rounded as two-fold.
112 In a diploid organism, there are three different alleles for a particular gene. Of these three alleles one is recessive and the other two alleles exhibit co-dominance. how many phenotypes are possible with this set of alleles?
A. 3
B. 6
C. 4
D. 2
This is nothing other than how the blood groups are. There is three different alleles, A, B and i. i is recessive, A and B exhibit co-dominance. And we have: AB, A, B and O phenotypes
Tuesday, July 6, 2010
NCERT CBSE Vistas Class 12 Chapter 6 On The Face Of It questions and answers
Who is Mr Lamb? How does Derry get into his garden?
Mr Lamb is the owner of the house with the garden. Derry just wanted to see the garden.
Do you think all this will change Derry's attitude towards Mr Lamb?
Of course. Because Mr Lamb has a peculiar way of talking. And Derry has been accustomed to thinking that everyone hates him. When he finds someone who doesn't hate him, who's not afraid of him, he is bound to change the attitude.
What is it that draws Derry towards Mr Lamb in spite of himself?
Mr Lamb is tin-legged, talks peculiarly, and above all isn't afraid of Derry. He's not bothered about Derry's face, doesn't ask a word about it until Derry makes him do so. He just wants to make a friend out of Derry.
In which section of the play does Mr Lamb display signs of loneliness and disappointment? What are the ways in which Mr Lamb tries to overcome these feelings?
Mr Lamb's feeling of loneliness is evident by his exclamation when Derry's leaving. He says that everyone who has come there left saying they would come back. But they would never come back. He tries to overcome these feelings by listening to honey bees, and by making toffies, making friend out of everyone coming to his house, letting kids have crab apples, letting his house have no curtains, etc.
The actual pain or inconvenience caused by a physical impairment is often much less than the sense of alienation felt by the person with disabilities. What is the kind of behaviour that the person expects from others?
The kind of behaviour that a person with physical impairment expects from others depends on the person. There are people who falls into the vicious cycle of gaining sympathy and feeling helpless, and then living miserably. People who like to be called 'disabled'. They'd want others to ask about their disability, sympathise with them and may be even lend a helping hand. But there are also people who find opportunities in adversity, who play the best game out of the bad hand nature has dealt them. They'd like others to call them 'differently abled' and to consider them like normal people.
Will Derry get back to his old seclusion or will Mr Lamb’s brief association effect a change in the kind of life he will lead in the future?
Derry is very young. His mind and will are plastic. He became a pessimist not by choice, but by chance. There was only sympathetic voices filling his ears until his meeting with Mr Lamb. And that is exactly why he was that lonely boy afraid of everyone. His session with Mr Lamb has brought a profound transformation in his life. He, for the first time in his life saw opportunities. And man's mind once stretched to a new idea can never go back to its original dimensions. So, Derry will excel.
Mr Lamb is the owner of the house with the garden. Derry just wanted to see the garden.
Do you think all this will change Derry's attitude towards Mr Lamb?
Of course. Because Mr Lamb has a peculiar way of talking. And Derry has been accustomed to thinking that everyone hates him. When he finds someone who doesn't hate him, who's not afraid of him, he is bound to change the attitude.
What is it that draws Derry towards Mr Lamb in spite of himself?
Mr Lamb is tin-legged, talks peculiarly, and above all isn't afraid of Derry. He's not bothered about Derry's face, doesn't ask a word about it until Derry makes him do so. He just wants to make a friend out of Derry.
In which section of the play does Mr Lamb display signs of loneliness and disappointment? What are the ways in which Mr Lamb tries to overcome these feelings?
Mr Lamb's feeling of loneliness is evident by his exclamation when Derry's leaving. He says that everyone who has come there left saying they would come back. But they would never come back. He tries to overcome these feelings by listening to honey bees, and by making toffies, making friend out of everyone coming to his house, letting kids have crab apples, letting his house have no curtains, etc.
The actual pain or inconvenience caused by a physical impairment is often much less than the sense of alienation felt by the person with disabilities. What is the kind of behaviour that the person expects from others?
The kind of behaviour that a person with physical impairment expects from others depends on the person. There are people who falls into the vicious cycle of gaining sympathy and feeling helpless, and then living miserably. People who like to be called 'disabled'. They'd want others to ask about their disability, sympathise with them and may be even lend a helping hand. But there are also people who find opportunities in adversity, who play the best game out of the bad hand nature has dealt them. They'd like others to call them 'differently abled' and to consider them like normal people.
Will Derry get back to his old seclusion or will Mr Lamb’s brief association effect a change in the kind of life he will lead in the future?
Derry is very young. His mind and will are plastic. He became a pessimist not by choice, but by chance. There was only sympathetic voices filling his ears until his meeting with Mr Lamb. And that is exactly why he was that lonely boy afraid of everyone. His session with Mr Lamb has brought a profound transformation in his life. He, for the first time in his life saw opportunities. And man's mind once stretched to a new idea can never go back to its original dimensions. So, Derry will excel.
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