A combination of two thin lenses in contact behave as converging lens of focal length 80 cm if one of the lense is convrging lens of focal length 20 cm, the power of other lens will be
Explanation.
f= focul length of combination of two lenses
f1= focul length of ist lens
f2= focul length of 2nd lens
As 1/f =1/f1 + 1/f2
1/80 = 1/20 + 1/f2
1/f2 = 1/80 - 1/20
f2 = -26.66cm
= -0.266 m
As Power of lens P= 1/f (where f will be in meters)
So
P=1/-0.266
= -3.75D
Showing posts with label MCAT. Show all posts
Showing posts with label MCAT. Show all posts
Friday 29 August 2014
Some MCQs of Physics and Chemistry.
Q1)when the aircraft concorde is moving in horizontal plane at const speed 650 m/s its turning circle has radius of 80 km wat is ratio of centripetal force to the weight of air craft?
Ans.
Q2)when 0.24 gm of magnesium is reacted with excess HCl what volume of gas librated at RTP
Ans.
Q3)In mixture of NO and CO2 initialy containing 4 mol of NO and 0.9 mol of CO2 reaction ocur acording to NO+CO2>NO2+CO at eq 0.1 mol of CO2 was presnt what is Kc
Ans.
Q4)a box of mas m =6 kg slid with speed v=4 m/s acros frictionless flor it sudenly explodes into 2 pieces one piece with mass m1 =2kg moves in same direction with speed v1=8 m/s find velocity of 2nd piece
Ans. as momentum before collision= momentum after collision
for m2 ,m=m1+m2 6=2+m2 m2=4kg so 6(4)=2(8)+4(x) 8=4x x=2m/s
Q5)Q2) on groud the gravitational force on satelite is W wat is gravitational force on satelite when at height R/50 where R is radius of earth
Ans. On the ground, the distance (from the centre of the Earth) is R. In orbit, the distance is R+R/50 or (51/50)R. The force is (ETA: inversely) proportional to the square of the distance so the multiplier you want is (50/51)^2 ~=0.96W
Q6)equal weights of methane and hydrogen are mixed in an an empty container at 25 degre centegrad the fraction of total presure exerted by hydrogen is.
Ans. apply mole fraction formula by daltons law of partial pressure
as moles fraction=no of moles of components/no of total moles let no of moles H2= n/2 let no of moles of CH4=n/16 total moles = n/2 + n/16 =9n/16 so mole fraction of pressure exerted byH2= n/2 ÷ 9n/16 = n/2 × 16/9n =8/9 ans
Ans.
Q2)when 0.24 gm of magnesium is reacted with excess HCl what volume of gas librated at RTP
Ans.
Q3)In mixture of NO and CO2 initialy containing 4 mol of NO and 0.9 mol of CO2 reaction ocur acording to NO+CO2>NO2+CO at eq 0.1 mol of CO2 was presnt what is Kc
Ans.
Q4)a box of mas m =6 kg slid with speed v=4 m/s acros frictionless flor it sudenly explodes into 2 pieces one piece with mass m1 =2kg moves in same direction with speed v1=8 m/s find velocity of 2nd piece
Ans. as momentum before collision= momentum after collision
for m2 ,m=m1+m2 6=2+m2 m2=4kg so 6(4)=2(8)+4(x) 8=4x x=2m/s
Q5)Q2) on groud the gravitational force on satelite is W wat is gravitational force on satelite when at height R/50 where R is radius of earth
Ans. On the ground, the distance (from the centre of the Earth) is R. In orbit, the distance is R+R/50 or (51/50)R. The force is (ETA: inversely) proportional to the square of the distance so the multiplier you want is (50/51)^2 ~=0.96W
Q6)equal weights of methane and hydrogen are mixed in an an empty container at 25 degre centegrad the fraction of total presure exerted by hydrogen is.
Ans. apply mole fraction formula by daltons law of partial pressure
as moles fraction=no of moles of components/no of total moles let no of moles H2= n/2 let no of moles of CH4=n/16 total moles = n/2 + n/16 =9n/16 so mole fraction of pressure exerted byH2= n/2 ÷ 9n/16 = n/2 × 16/9n =8/9 ans
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Saturday 10 May 2014
How to solve MCAT MCQs
1..
Read the multiple choice question carefully and think of an answer
before you see your choices. Read the choices to see if your answer is
there. If so, it is probably right. Read the other answers quickly to be
certain.
2.. If your answer is not one of the choices, then read all the choices carefully and start to eliminate choices.
3.. Cross out any answers that are obviously wrong.
4... When you narrow your choices to two, try each answer with the question to see if they both make sense. Sometimes you'll find a hidden clue, like a subject/verb agreement that gives it away.
5.. If you are confused by "all of the above" and "none of the above" questions and they tend to take up too much time, leave all of those blank and go back to them. These questions have an element of logic to them, and some people take longer than others to work out logic problems. If you find that they require a little extra concentration, you may need to treat them as a separate section.
6.. If you are stumped about a word, dissect it for clues. Think about the meanings of the prefix or suffix. Compare it to other words that start with the same letters. For example, the prefix "epi" is found in the word epidermis, which refers to the top layer of the skin. What can you discern, then, about a plant called an "epiphyte?" Would it have roots that stretch deep into the dirt or would it grow on the surface of something?
7... Don’t second-guess yourself. If you make an educated guess the first time around, don’t go back and start changing your answers around.
8.. Keep an eye on the clock to give yourself time to re-visit the questions you left blank.
9... If all else fails, choose B or C! A few studies show that those answers are correct at a slightly higher rate than A or D.
2.. If your answer is not one of the choices, then read all the choices carefully and start to eliminate choices.
3.. Cross out any answers that are obviously wrong.
4... When you narrow your choices to two, try each answer with the question to see if they both make sense. Sometimes you'll find a hidden clue, like a subject/verb agreement that gives it away.
5.. If you are confused by "all of the above" and "none of the above" questions and they tend to take up too much time, leave all of those blank and go back to them. These questions have an element of logic to them, and some people take longer than others to work out logic problems. If you find that they require a little extra concentration, you may need to treat them as a separate section.
6.. If you are stumped about a word, dissect it for clues. Think about the meanings of the prefix or suffix. Compare it to other words that start with the same letters. For example, the prefix "epi" is found in the word epidermis, which refers to the top layer of the skin. What can you discern, then, about a plant called an "epiphyte?" Would it have roots that stretch deep into the dirt or would it grow on the surface of something?
7... Don’t second-guess yourself. If you make an educated guess the first time around, don’t go back and start changing your answers around.
8.. Keep an eye on the clock to give yourself time to re-visit the questions you left blank.
9... If all else fails, choose B or C! A few studies show that those answers are correct at a slightly higher rate than A or D.
How to Prepare yourself for MCAT
Here
are the tips for the preparation of MCAT. Students should not be
confused. here are tips for preparation of physics, chemistry and
biology.
1. Physics
Dear students, the MCQs of physics in the paper are both easy and difficult. There are a total of 44 MCQs. Out of them, about 36 mcqs are quite easy and can be said as book lines. However, remaining 8 mcqs are not as such from the book. These mcqs are always world known and conceptual, not too difficult but quite interesting. In order not to lose 50 marks, which literally DECIDE YOUR MERIT, you have to be keen about those 8 mcqs as well.These mcqs involve diagrams and calculations etc, but are not so difficult. But you must have once gone through them before the entrance test. That's it!!
2. Chemistry
There are a total of 58 mcqs in chemistry. According to the updated syllabus, 2012-2013 about 52 mcqs are quite lenient(no diagrams), but remaining may contain diagrams and the most important questions in the form of diagrams come from AMINO ACIDS and MACROMOLECULES. Moreover, you should have FULL GRIP on your organic chemistry. Because 30 questions are from organic chemistry only. A good teacher can help you master the organic chemistry. If you think that first year chemistry is difficult then don't waste all your time on learning it only. There are 18 mcqs from first year and 40 from second year. So, try to keep a balance. That's it!!
3. Biology
There are 88 mcqs in biology paper. Dear students, ALL THESE MCQs are SIMPLE BOOK LINES except a few (3 or 4). So, you have to prepare it necessarily from book. I don't say that simply CRAM the book lines. You should learn all the topics of Biology like a story, yes a scientific story. Don't cram same to same book words but try to learn everything that is written in the book. And you need not learn any key books or notes in order to GET CONCEPTS. I can say, with extreme honesty that all the concepts are easily available in our textbook. So, you must take your textbook as reference. Learn everything from it, because not even a single word in mcat is from outside the range of your book. So, plz be serious about it. That's it....!
4. English
Now comes the embarrassing question of English (embarrassing for most of the students..). Actually the paper consists of 30 mcqs. These mcqs are very very important in deciding your merit. There are roughly 2 categories of questions:
Vocabulary (4 fill in the blanks and 10 synonyms)
Correction (6 Spot the Error and 10 choose the correct sentence)
So, you have to focus on these 2 things and I CLAIM that VOCABULARY is MORE IMPORTANT. Not even a single question in the paper of English is without the use of Vocabulary( given by UHS in syllabus "Essential Word Power"). So, you must have firm grip on these 872 vocabulary words. These are very very difficult words and have been eliminated from the Oxford Dictionary. At least, you must know the meaning of each and every word. This will cause your avoirdupois of English be reduced.
In grammar, you should know only the basic and primal concepts of tenses and PREPOSITION. You must learn all the basics, only basics not detailed concepts of verb, adverb, adjective, etc. These questions are very easy for those who are good at English and have a good base. but the students who need improvement must CONCENTRATE on English Grammar and general rules. These rules are taught by teachers. So, prefer them or simply read books for grammar like Captain and Bright. I personally prefer Captain Key book( only its Grammar portion). Thus the key to at least 25 correct questions in English is THE GRIP ON VOCABULARY. That's it!!!!
by : a medical student..
1. Physics
Dear students, the MCQs of physics in the paper are both easy and difficult. There are a total of 44 MCQs. Out of them, about 36 mcqs are quite easy and can be said as book lines. However, remaining 8 mcqs are not as such from the book. These mcqs are always world known and conceptual, not too difficult but quite interesting. In order not to lose 50 marks, which literally DECIDE YOUR MERIT, you have to be keen about those 8 mcqs as well.These mcqs involve diagrams and calculations etc, but are not so difficult. But you must have once gone through them before the entrance test. That's it!!
2. Chemistry
There are a total of 58 mcqs in chemistry. According to the updated syllabus, 2012-2013 about 52 mcqs are quite lenient(no diagrams), but remaining may contain diagrams and the most important questions in the form of diagrams come from AMINO ACIDS and MACROMOLECULES. Moreover, you should have FULL GRIP on your organic chemistry. Because 30 questions are from organic chemistry only. A good teacher can help you master the organic chemistry. If you think that first year chemistry is difficult then don't waste all your time on learning it only. There are 18 mcqs from first year and 40 from second year. So, try to keep a balance. That's it!!
3. Biology
There are 88 mcqs in biology paper. Dear students, ALL THESE MCQs are SIMPLE BOOK LINES except a few (3 or 4). So, you have to prepare it necessarily from book. I don't say that simply CRAM the book lines. You should learn all the topics of Biology like a story, yes a scientific story. Don't cram same to same book words but try to learn everything that is written in the book. And you need not learn any key books or notes in order to GET CONCEPTS. I can say, with extreme honesty that all the concepts are easily available in our textbook. So, you must take your textbook as reference. Learn everything from it, because not even a single word in mcat is from outside the range of your book. So, plz be serious about it. That's it....!
4. English
Now comes the embarrassing question of English (embarrassing for most of the students..). Actually the paper consists of 30 mcqs. These mcqs are very very important in deciding your merit. There are roughly 2 categories of questions:
Vocabulary (4 fill in the blanks and 10 synonyms)
Correction (6 Spot the Error and 10 choose the correct sentence)
So, you have to focus on these 2 things and I CLAIM that VOCABULARY is MORE IMPORTANT. Not even a single question in the paper of English is without the use of Vocabulary( given by UHS in syllabus "Essential Word Power"). So, you must have firm grip on these 872 vocabulary words. These are very very difficult words and have been eliminated from the Oxford Dictionary. At least, you must know the meaning of each and every word. This will cause your avoirdupois of English be reduced.
In grammar, you should know only the basic and primal concepts of tenses and PREPOSITION. You must learn all the basics, only basics not detailed concepts of verb, adverb, adjective, etc. These questions are very easy for those who are good at English and have a good base. but the students who need improvement must CONCENTRATE on English Grammar and general rules. These rules are taught by teachers. So, prefer them or simply read books for grammar like Captain and Bright. I personally prefer Captain Key book( only its Grammar portion). Thus the key to at least 25 correct questions in English is THE GRIP ON VOCABULARY. That's it!!!!
by : a medical student..
Tuesday 6 May 2014
ECAT MCQs Part 1
- Converse of pair production is
a)compton effect
b)annihilation of matter
c)photoelectric effect
d)none of them - de broglies hypothesis was experimentally verified by
a)maxwell
b)compton
c)einstien
d)davion and germar - What is the unit of absorbed dose?
a)gray
b)severt
c)curie
d)roentgen - The decay of neutron results into the formation of
a)proton,positron
b)proton,electron
c)electron,anti neutrino
d)proton,helium - The unit of concentration is
a)mol. ml
b)mol dm^-3
c)gm equivalent lit^-1
d)g. lit^-1 - If there are weak intermolecular forces in a liquid, it will be
a)more volatile
b)more dense
c)less volatile
d)heavy dense - In the definition of conic the constant ratio is called
a)directrix
b)focus
c)vertex
d)eccentricity - Which sentence is correct?
A. How beautiful moon is!
B. How beautiful the moon is!
C. How beautiful that moon is!
D. How beautiful the moon is. - sugar crystals belong to the
a)cubic
b)monoclinic
c)triclinic
d)orthrorhombic - weber is a unit of
a)magnetic flux
b)magnetic flux density
c)magnetic induction
d)none of these
AGA KHAN University Admission Schedule
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Admission Start from 07-04-2014
Last Date of Form Submission = 15-05-2014
Test Date = SUNDAY, JUNE 22, 2014
Application Processing Fee Rs. 4800/-
ETEA Test Schedule
ETEA Test Schedule for 2014:
Reg:
June-july
ETEA test:
10 Aug for engineering
18 Aug for medical test
Result: Aug
Reg:
June-july
ETEA test:
10 Aug for engineering
18 Aug for medical test
Result: Aug
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