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Showing posts with label Mcq. Show all posts
Showing posts with label Mcq. Show all posts

Tuesday, May 14

Lahore Board 2007 Physics Part 2

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1) the word xerography means
a) to take photograph
b) dry writing
c) writing by machine
d) to paint something


2) rheostat can operate as
a)transformer
b)amplifier
c)potential divider
d)oscillator


3) force on a moving charge in a magnetic filed is given by
a) F = q (B x V)
b) F = q(B + V)
c) F = q (V x B)
d) F = BIL


4)the sum of positive and negative peak values are usually written as
a) P-n values
b)P-P values
c)rms values
d)cycle values


5) in case of capacitor the unit of reactance is called
a) farad
b) Ohm
c) MoH
d) Henry


6) substances which break just after elastic limit is reached are
a)poor substances
b)brittle
c)ductile
d)soft substances


7) materials whose resistivity become zero below a certain temp are
a)good conductors
b)insulators
c)semi conductors
d)super condcutors


8) X=A+B is the mathematical natation for
a)OR gate
b)AND gante
c)NOR gate
d)NAND gate


9) theory of relativity which deals with non inertial frame of reference
a)special theory of relativity
b)general theory of relativity
c)quantum theory
d)classic theory


10) a pair of quark and anti quark makes a
a)meson
b)baryon
c)photon
d)proton

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Monday, May 13

Past Papers of Fsc

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Here we will be adding the Mcqs from Fsc papers of last few years. Correct answers are mentioned but try to solve the question or think about it at-least once before looking for the correct answer. In-case of any error inform us on the page (http://www.facebook.com/Etest.Prep).
In order to send us the past papers which we haven't added use the same link :-)

Papers of Math
Papers of Biology
Papers of Chemistry
Papers of Phyiscs
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Papers of Biology

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Sunday, May 12

Gujranwala Board 2011 Bio Part 2

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1) the form of learning which involves a dimution of response to repeated stimuli
a) imprinting
b) habituation
c) latent learning
d) insight learning


2) gastrin is a hormone reduced by
a) adrenals
b) pancrease
c) gut
d) liver


3) the duration of gestation period in human female is
a) 250 days
b) 260 days
c) 280 days
d) 270 days


4) light sensitive pigment in plants
a) cytochrome
b) phytochrome
c) photochrome
d) auxin


5) only 30 percent of earth is
a) land
b) fresh water
c) marine water
d) mountains


6) limnetic phytoplankton include the
a) bacteria
b) algae
c) mosses
d) cyanobacteria


7) in ecosystem 2nd trophic level is consisted of
a) prdoducers
b) primary consumers
c) secondary consumers
d) tertiary consumers


8) according to endosymbiont hypothesis the aerobic bacteria developed into
a) ribosomes
b) lysosomes
c) mitochondria
d) golgi apparatus


9) the spindle fibers are composed of RNA and protein called
a) insulin
b) tubulin
c) actin
d) myosin


10) the enzyme luciferase is produced by an insect called
a) housefly
b) firefly
c) butterfly
d) tsetefly


11) cambium is an example of
a) apical meristem
b) intercalary meristem
c) lateral meristem
d) apex


12) V-shaped chromosome is called
a) acrocenteric
b) telocentric
c) metacentric
d) submetacentric


13) fibers, scleriods, and vessels are three types of
a) collenchyma
b) scelerenchyma
c) parenchyma
d) cambium


14) bone dissolving cells are called
a) osteocalsts
b) osteoblasts
c) osteocytes
d) stem cells

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Lahore Board 2011 Bio Part 2

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1) animals excreting ammonia are
a) ureaotelic
b) uricotelic
c) ammnotelic
d) excretoltelic


2) earth worn has tubular excretory system called
a) procphridia
b) protonephridia
c) mesonephridia
d) metanephridia


3) which hormone in male stimulates the intersititail cells of the testsis to secrete testosterone
a) TSH
b) FSH
c) ICSH
d) LTH


4) hormone secreted by mucose of pyloric regiom of stomach is
a) gastrin
b) secretin
c) osetrogen
d) progesterone


5) corpus leteum starts secreting a hormone called
a) oestrogen
b) progesterone
c) oxytocin
d) testosterone


6) in human female discharge of blood and cell debris is called
a) ovulation
b) menstruation
c) abortion
d) secretion


7) cleavage results in the formation of rounded closely packed mass of balstomere called
a) morula
b) blastula
c) gastrula
d) neurula


8) in 1882 chromosomes were first observed by
a) john brown
b) walther fleming
c) alter Sutton
d) TH morgan


9) condensation of chromosomes reaches to is max in
a) diakinesis
b) pachytene
c) zygotene
d) leptotene


10) the individuals which are universal recipients have
a) A blood group
b) B
c) AB
d) O


11) Wallace developed a theory of natural selection identical to
a) Lamarck
b) Linnaeus
c) Darwin
d) Hutton


12) zone where light penetrate to support photosynthesis
a) limnetic zone
b) littoral zone
c) profundal zone
d) benthic zone



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Gujranwala Board 2010 Bio Part 2

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1) lung cancer is cause due to
a) SO2
b) CFS
c) oxides of nitrogen
d) CO


2) when sperms are in tubules protection and nourishment is provided by
a) sertoli cells
b) interstitial cells
c) epidydimis
d) seminiferous tubules


3) savanna are the grasslands in
a) temperate climate
b) tropical climate
c) arctic tundra
d) alpine tundra


4) phenyl ketonuria is a well known example of
a) deletion
b) insertion
c) inversions
d) point mutation


5) in plants elongation of cells is favored by
a) infrared light
b) red light
c) blue light
d) UV light


6) reptiles are included in
a) endotherm
b) ectotherms
c) homeotherms
d) heterotherms


7) twisting around actin there are two strands of another protein
a) myosin
b) tropoinin
c) tropomyosin
d) creatinine


8) in a population that is in hardy Weinberg equilibrium, 16% individuals show the recessive trait what is the frequency of the dominant allele in the population
a) 0.48
b) 0.36
c) 0.84
d) 0.4


9) the syndrome having trisomy of chromosome no 18
a) edward
b) down
c) ptau
d) jacob’s


10) a genome is a full set of gene of a
a) cell
b) tissue
c) individual
d) population


11) association b/w fungus and alga is an example of
a) commensalism
b) parasitism
c) mycorhiza
d) lichens


12) the genic system for determination if sex is present in
a) ginkgo
b) yeast
c) drosophila
d) protenor bug


13) ovary under stimulus of FSH produces
a) estrogen
b) progesterone
c) oxytocin
d) corticosteroids


14) heart wood accumulates the chemical
a) cellulose
b) abseisins
c) chitin
d) resin


15) metabolism of purine and pyrimidine produces significant amount of
a) creatinine
b) creatine
c) xanthine
d) trimethylamine oxide


16) simplest form of learning is
a) imprinting
b) habituation
c) insight learning
d) latent learning

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Lahore Board 2010 Bio Part 2

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1) protein filament which binds to calcium
a) actin
b) myosin
c) troponin
d) tropomyosin


2) which one of the following is plantigrade
a) rabbits
b) monkeys
c) horses
d) goats


3) match diabetes inspidus with one of the following
a) oxytocin
b) vasopressin
c) insulin
d) glucagen


4) kohler used chimpanzee to prove
a) habituation
b) imprinting
c) latent learning
d) insight learning


5) when will u call embryo fetus
a) after two months
b) after three months
c) after four months
d) after five months


6) the larval epidermis is formed from
a)clear cytoplasm
b) yellow cytoplasm
c) gray vegeta cytoplasm
d) gray equatorial cytoplasm


7) which of following is stop signal during transcription
a) CA
b) GA
c) GC
d) TA


8) which one is absent in animal cell
a) spindle
b) centriole
c) chromatids
d) phragmoplast


9) locus is a
a) part of DNA
b) position of gene
c) partner of gene
d) complement of gene


10) the first restriction enzyme was isolated by
a) kary mullis
b) hamilton
c) sanger
d) maxam


11) the main reason for extinction of species is
a)population
b) overproduction
c) habitat destruction
d) parasitism


12) which is not a micro nutrient
a) zinc
b) iron
c) sulfur
D)iodine


13) plants in deserts
a) remain ever green
b) short rooted
c) conserve water
d) broad leaves


14) percentage of land under cultivation
a) 30 percent
b) 21 %
c) 11%
d) 5%

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Gujranwala Board 2007 Bio Part 2

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1) muscle fatigue is caused by
a) CO2
b) accumulation of lactic acid
c) fumaric acid
d) ethyl alcohol


2) the neuron net of hydra lacks
a) neurons
b) direction of impulse flow
c) connections
d) dendrites


3) every gene starts with codon AUG which normally encodes the amino acid
a) arginine
b) cutruline
c) methionine
d) lysine


4) in klinefilter syndrome
a) one x chromosome missing
b) additional sex chromosome
c) sex chromosome fail to segregate
d) none


5) drosophila males are
a) homozygous
b) heterozygous
c) semizygous
d) hemizygous


6) one common type of vector is a
a) chromosome
b) lysosome
c) plasmid
d) mitochondria



7) The living plants which can store water , during drought, in their fleshy stems are :
a) cacti
b) euphorbia
c) both a and b
d) none of these

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Lahore Board 2007 Bio Part 2

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1) the collecting tubules open into
a) glonmerulus
b) bowman’s capsule
c) urethra
d) pelvis


2) the P730-P660 inter-conversions might be the plant time regulators for
a) leafing
B) budding
c) flowering
d) shooting


3) S-phase in case of human cell cycle is
a) 20 min
b) 9 hrz
c) 10 hrz
d) 4.5 hrz


4) soil is continuously depleting its mineral nutrient due to vigorous
a) crop production
b) deforestation
c) tree production
d) population explosion


5) archeabacteria tolerate temp upto
a) 110 C
b) 120 C
c) 130 C
d) 140 C


6) the cell membrane is virtualy impermeable to all ions except
a) Ca2+
b) Mg2+
c) Na1+
d) K1+


7) a central role for chromosome in hereditary was first suggested by
a) karl correns
b) Fredrick miescher
c) Fredrick sanger
d) Fredrick grifith


8) Eco R1 cuts double stranded DNA when it has this sequence at the
a) breaking site
b) flanking site
c) cleavage site
d) joining site

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Saturday, May 11

Gujranwala Board 2009 Bio Part 2

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1) which one is said to be excretophore
a) pants
b) stem
c) roots
d) leaves


2) vertebral column protects the cord and has ________ curvatures
a) 2
b) 3
c) 4
d) 5


3) which produce the reception of pain
a) nocireceptors
b) mechanorecptors
c) chemoreceptors
d) thermoreceptors


4) number of cranial and spinal nerves in man
a) 12 , 31
b) 24 , 62
c) 10 , 40
d) all


5) mRNA is synthesized by
a) RNA polymerase
b) DNA polymerase
c) DNA ligase
d) none of these


6) Se is on _______ chromosome
a) 9
b) 19
c) 21
d) 24


7) which one is human smallest chromosome
a) 22
b) 12
c) 14
d) 20


8) eukaryotes are thought to have first appeared about ______ billion years ago
a) 1.5
b) 2.5
c) 3.5
d) 4.5


9) scientific name for rehus monkey
a) Maccaca Mulatto
b) taxus baccata
c) felis felis
d) none of these


10) modern man is called homo sapiens and has been on this world for about _____ years
a) 10000
b) 20000
c) 30000
d) 40000


11) condition in which palatine plate fail to fuse
a) cleft palate
b) arthritis
c) tetany
d) osteoporosis

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Lahore Board 2009 Bio Part 2

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1) end product of Hb breakdown and metabolites of various hormones is
a) uric acid
b) bilirubin
c) creatinine
d) all


2) the collenchyma cells have protoplast and usually lack
a) secondary wall
b) primary wall
c) cell membrane
d) vacuole


3) spontaneous movements due to internal causes
a) autonomic
b) paratonic
c) tactic
d) taxi


4) absicis acid promotes closing of stomata under condition of
a) water stress
b)light stress
c) temp stress
d) wind stress


5) largest part of brain
a) cerebellum
b) cerebrum
c) medulla
d) thalamus


6) clear cytoplasm produces
a) muscle cells
b) larval epidermis
c) gut
d) neural tube


7) succive amino acids bearing t Rna will bind at
a) A site
b) B site
c) P site
d) E site


8) gene with multiple phenotypic effects
a) polygenic allele
b) Bombay allele
c) pleotropic allele
d) multiple allele


9) ABO blod group system was discovered by
a) Landsteiner
b) morgan
c) correns
d) bernstein


10) cystic fibrosis patients lacks a gene that encodes for trans-membrane carrier for
a) calcium ions
b) sodium ions
c)chlorine
d) chloride ions


11) the rate of primary production is about 70-1500 g/m2 annually in
a) temperate grassland
b0 desert
c) tundra
d) tropical grassland


12) largest consumer of electrical energy is
a) homes
b) offices
c) industries
d) agriculture

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Gujranwala Board 2008 Bio Part 2

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1) the animals which do not adjust their internal salt conc. according to external environment are
a) osmo regulators
b) thermo regulators
c) osmo conformers
d) none of these



2) the movement in response to stimulus of light is called
a) photo tactic movement
b) chemo tactic moment
c) sleep movement
d) rapid movement


3) the structural and functional unit of nervous system is
A) neuron
b) neuroglial cells
c) receptor
d) effector


4) fruit development proceeds without fertilization and no seed formation takes place is called
a) parthenocrapy
b) seed dormancy
c) photoperiodism
d) none of these


5) the ability to regain the lost part is called
a) regeneration
b) aging
c) embryonic induction
d) none of these


6) different alleles of a gene that are both expressed in a heterozygous condition are called
a) co dominance
b) complete dominance
c) over dominance
d)dominance


7) natural extra chromosomal circular DNA in bacteria are called
a) plasmids
b) endonucleases
c)phage virus
d) restriction enzymes


8) group of interbreeding individual belonging to a particular species and sharing a common geographic area are called
a) species
b) population
c) individual
d) community


9) the succession in pond is called
a) xerosere
b) hydrosere
c) mezosere
d) none of these


10) floating plants are called
a) phytoplankton
b) algae
c) fungi
d) protista


11) ozone is present upto the height of
a) 10-50 km
b) 100 km
c) 90 km
d) 110km


12) metanephridium is present in
a) earth worm
b) cockroach
c) hydra
d) planaria


13) if plants are wounded they form masses known as
a) calluses
b) chelated
c) cholorosis
d) none of these


14) adenine and guanine forms
a) purine
b) pyrimidine
c) nucleatidase
d) phosphodiester bond

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Lahore Board 2008 Bio Part 2

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1) All of the following are synthesized by liver except that of
a) glucagon
b) alumin
c) fibrinogen
d) prothrombin


2) all of the following are related to axial skeleton except
a) skull
b) ribs
c) sternum
d) appendages


3) which one is not related to others
a) myoxedma
b) diabetes
c) cretinism
d) exopithalmic goiter


4) during delivery in human females the average loss of blood is about
a) 250cm3
b) 350cm3
c) 350mm3
d) 250mm3


5) the meristem present at the bases of inter nodes in many plants is
a) apical meristem
b) intercalary meristem
c) lateral meristem
d) cork cambium


6) a central role for chromosome in hereditary was first suggested in 1990 by
a) W.S Sutton
b) TH Morgan
c) Karl correns
d) walther fleming


7) in which phase of cell cycle the no of chromosomes become double
a) S phase
b) G1 phase
c) G2 phase
d) Go phase


8) all the alleles found in breeding population nat a given time are collectively called
a) Poly-gene
b) gene pool
c) continuously varying trait
d) multiple alleles


9) the enzyme that extracted from thermos aquatieus bacterium is
a) DNA polymerase
b) taq polymerase
c) rna polynmerase
d) dna polymerase and taq polymerase


10) in a population with two alleles for a particular locus Ba and b the allele frequency of B is 0.7 what would be the frequency of heterozoyte if the population is in hardy Weinberg equilibrium
a) 0.42
b) 0.49
c) 0.03
d) 0.21


11) the living organism who can prepare their own food
a) green plants
b) Producers
c) Heteroptrophs
d) Green plants and producers


12) in Sindh the desert ecosystem is called
a) Thar
b) Thal
c) Cholistan
d) Temperate


13) a single chlorine atom can react with UV rays and destroy ozone molecules as many as
a) one billion
b) one million
c) two million
d) two billion


14) the type of calcium phosphate stones of all types of stones are
a) 5 percent
b) 15 percent
c) 10 percent
d) 70 percent


15) the structure formed by the fusion of posterior four pelvic vertebrae
a) Sacrum
b) coccyx
c)atlas
d) axis


16) The ones of elipsey occurs before the age of
a) 30s
b) 60s
c) 25 yrs
d) 50 yrs


17) the first convoluted part of vas deferens is called
a)Epidydmis
b) seminiferous tubule
c) ureter
d) scrotum

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Bahawalpur Board 2009 maths Part 2 Group 2

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1) ( e2x - 1 )/ 2ex equals
a) Sin x
b) Sinh x
c) Cos x
d) Cosh x


2) Limn→∞ (1 - 1/n)n equals:
a) e
b) e2
c) e-1
d) e-2


3) d/dx [x(x-3)] equals:
a) 2x - 3
b) 3x - 2
c) 2x + 3
d) 3x - 2


4) (d/dx(Sin x))2 + (d/dx(Cos x))2 equals:
a) -1
b) 1
c) 0
d) 2


5) If y=Cos(π/2 - x) , then y2 equals:
a) -Sin x
b) Sin x
c) Cos2x
d) -Cos x


6) ∫ cosec2x equals:
a) Cot x + c
b) -Cot x + c
c) -2Cosec x + c
d) 2Cosec x + c


7) ∫ esin x . Cos x equals:
a) esin x + c
b) ecos x + c
c) -esin x + c
d) - ecos x + c


8) ∫ Sec2 dx with limits 0 to π/4 equals:
a) 0
b) -1
c) 1
d) 2


9) ∫ 1/√(1-x2) dx with limits 0 to 1 is equal to
a) π/6
b) π/4
c) π/3
d) π/2


10) The solution of differential equation dy/dx = 1/1+x2 is:
a) y = Sin-1x + c
b) y = Sec-1x + c
c) y = Tan-1x + c
d) y = Cot-1x + c


11) The midpoint of the line through two points (-1,-4) and (-1.0) is :
a) (-1,-2)
b) (-2,-2)
c) (-1,2)
d) (-1,0)


12) The slope of the line parallel to 2x - 7y + 4 = 0 is:
a) -7/2
b) 7/2
c) 2/7
d) -2/7


13) The angle between two lines represented by x2 - 2xy + y2 = 0 is:
a) π/2
b) 0
c) π/4
d) π/3


14) The radius of the circle x2 + y2 = 5 equals:
a) 5
b) 25
c) 5/2
d) √5


15) The length of the tangent from point (0,1) to circle x2 + y2 + 8 = 0 equals
a) 3
b) 8
c) 4
d) √3


16) The focus of the parabola x2 = 4(y-1) equals :
a) (0,0)
b) (0,2)
c) (0,-2)
d) (2,0)


17) The center of the ellipse (x+1)2/9 + (y-1)2/5=1 is:
a) (-1,1)
b) (1,-1)
c) (1,1)
d) (-1,-1)


18) Transverse axis of y2/a2 - x2/b2 = 1 is :
a) y=0
b) y=a
c) x=0
d) x=b


19) If | xi - j + k | = √6 , then x equals:
a) ±2
b) ±3
c) ±1
d) 0


20) The value of (i x j) . k is
a) 0
b) -1
c) 1
d) 2

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Friday, May 10

Bahawalpur Board 2009 maths Part 2

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1) If |AB x AC| = 9 , then the area of triangle ABC equals:
a) 18
b) 9
c) 9/2
d) 27


2) A unit vector in direction of [3 , -4] is:
a) [1/5 , 2/5]
b) [-3/5 , 4/5]
c) [-1/5 , 4/5]
d) [3/5 , -4/5]


3) Vertices of hyperbola x2/16 - y2/4=1 are:
a) (±2,0)
b) (0,±2)
c) (±4,0)
d) (0,±4)


4) For an ellipse eccentricity is
a) one
b) less than one
c) greater than one
d) zero


5) Focus of parabola y2 = 8x is:
a) (0,-2)
b) (8,0)
c) (2,0)
d) (-8,0)


6) The length of tangent drawn from (1,2) to the circle x2 + y2 + 2x + 4y - 14 = 0 is:
a) 1
b) √6
c) 4
d) 12


7) The center of the circle x2 + y2 + 12x -10y = 0
a) (6,5)
b) (-6,5)
c) (-6,-5)
d) (6,-5)


8) if f(tx , ty) = tnf(x,y) then f(x,y) is a homogeneous function of degree:
a) n-1
b) t
c) n
d) n + 2


9) Slope of line parallel to x axis is
a) π/3
b) 1
c) 0
d) undefined


10) Distance of the point (1,2) from y axis is
a) -2
b) 1
c) -1
d) 2


11) Order of differential equation y dy/dx + 2x = 0 is
a) 3
b) 2
c) 1
d) 4


12) ∫ sec2x dx with limits 0 to π/4 is equal to:
a) 0
b) 1/2
c) 1/4
d) 1


13) ∫ 1/x dx with limits 0 to 1 is equal to:
a) 0
b) 1
c) ∞
d) -1


14) ∫ 1/xlnx dx equals:
a) ln(lnx) + c
b) lnx + c
c) -lnx + c
d) -ln(lnx) + c


15) ∫ tanx dx equals:
a) ln|Cosx| + c
b) -ln|Cosx| + c
c) -ln|Secx| + c
d) ln|Sinx| + c


16) f(x) decreases if:
a) f'(x) = 0
b) f'(x) > 0
c) f'(x) ≥ 0
d) f'(x) < 0


17) d/dx ( Sin 1/x) is equal to
a) 1/x Cos 1/x
b) -1/x2Cos 1/x
c) 1/x2Cos 1/x
d) -1/x Cos 1/x


18) dy/dx for 3x + 4y + 7 = 0 is
a) 1/4
b) 4/3
c) -4/3
d) -3/4


19) Limx→0 (ex - 1)/x equals:
a) 0
b) 1
c) -2
d) 2


20) If f(x)=e2lnx, then f(0) is
a) 0
b) 2
c) ∞
d) 1


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Thursday, May 9

Bahawalpur Board Math 2010-Part 2

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1) The volume of parallelepiped is equal to:
a) ( u x v ) . w
b) ( u x v ) x w
c) u x ( v x w )
d) u x ( v x v )


2) Two non- zero vectors u and v are parallel if
a) u . v = 1
b) |u . v| = 1
c) u . v = 0
d) u . v ≠ 0


3) Which one is focus of parabola y2= 4ax
a) (a,0)
b) (-a,0)
c) (0,0)
d) (0,-a)


4) x2 + y2 + 2gx + 2fy = 0 represents :
a)circle
b) ellipse
c) hyperbola
d) parabola


5) eccentricity of ellipse x2 / a2 + y2 / b2 = 1 , a > b is
a) a / c >1
b) ac < 1
c) c / a < 1
d) a / c2 > 1


6) the variables used in system of linear equalities are also known as
a) constants
b) constraints
c) solutions
d) corners


7) second degree homogenous equation is equal to
a) ax2 + bx + c = 0
b) ax3 + bx2 + cx +d=0
c) ax+by+c=0
d) ax2 + 2hxy + by2 = 0


8) if line is parallel to x-axis then "α" is equal to
a) 0o
b) 90o
c) 120o
d) 150o


9) ∫ 1/√(1-x2) dx with limits 0 to 1 is equal to
a) π/6
b) π/4
c) π/3
d) π/2


10) d3y/dx3 + 2d2y/dx2 + d/dx + y = 0 is the differential equation of the

order
a) 2
b) 3
c) 4
d) 5


11) ∫ e^x [ cosx + sinx ]dx is equal to:
a) ex cosx + c
b) ex sinx + c
c) ex tanx + c
d) ex cotx + c


12) ∫ sec2x / tanx dx is :
a) ln tanx
b) ln cotx + c
c) cotx + c
d) tanx + c


13) ∫ x^n dx where n ≠-1 is equal to:
a) xn-1 / n-1 + c
b) xn+1 / n+1 + c
c) xn /n + c
d) xn+2 / n+2 + c


14) the function f(x) = ax2 + bx + c = 0 has the minimum value if
a) a > 0
b) a < 0
c) a > 1
d) a > 2


15) 1 – 1/2 +1/3 -1/4 + …… is the expansion of
a) ln2
b) ln3
c) ln4
d) ln5


16) d/dx cos-1x is equal to
a) 1 / √(1-x2)
b) -1 / √(1-x2)
c) 1 / √(x2-1)
d) -1 / √(x2-1)


17) d/dx ( x + 1/x) is equal to
a) 1 + 1/x
b) 1 – 1/x2
c) x – 1/x2
d) x + 1/x2


18) ∫ cosx dx with limits 0 to π is :
a) -2
b) -1
c) 0
d) 2


19) Area, surface area, volume etc deal with
a) integral calculus
b) differential calculus
c) complex numbers
d) infinite numbers


20) sinhx is equal to:
a) [ ex + e-x ] / 2
b) [ ex – e-x ] / 2
c) [ ex - e-x ] / [ex + e-x]
d) [ ex + e-x ] / [ex - e-x]

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Monday, January 14

Solutions of Questions:

By With 1 comment:
Question 1: 

A copper wire of resistance 12 ohm. Its bent in the form of a circle. The effective resistance b/w two points a across a diameter is
a) 3 ohm 
b) 6 ohm 
c) 12 ohm 
d) 24 ohm


Solution:

3 ohm is the answer...
For Solution see the pic:

https://www.facebook.com/photo.php?fbid=410656699014991&set=a.144657985614865.37547.130470747033589&type=1&relevant_count=1
In case of confusion do inform... 

Question 2:
An element that would form anion of largest size to get a noble gas electronic configuration is :
a. sodium
b. phosphorus
c. chlorine
d. sulphur


Ans: 
Sulphur

Solution: 

This question tests your knowledge of cations and anions and their sizes in comparison to their parent atoms.
Remember the two points:


          1) Size of cation is always smaller than the parent atom
          2) Size of anion is always larger than the parent atom.

Now check among the above given options which one will form anion and which one will form cation to gain the noble gas electronic configuration.

a) Sodium: Its oxidation state is +1 and thus will form a cation.
b) phosphorous: Its oxidation states are +3 and +5 and thus will form cation.
c) chlorine: its oxidation state is -1 and thus will form anion.
d) sulphur: its oxidation state is -2 and will form anion. 

For sodium and phosphorous the formation of anion isn't possible to get the noble gas electronic configuration so we are left with two options now. 

Moving across the periods size of an atom decreases, so size of Chlorine atom is smaller than that of Sulfur. Moreover 
Chlorine gets one electron to complete the octet while sulphur gets two electrons. So more the electrons more the repulsion and thus greater the size.. 
Therefore, the answer to this question is sulphur.

Hope its clear now :) In case of any confusion fee free to ask...


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