Loading

  Question 1

Apomictic embryos in citrus arise form :

A : Maternal sporophytic tissue in ovule
B : Antipodal cells
C : Diploid egg
D : Synergids


  •  
    .

     Correct answer is : A


  •   Question 2

    If due to some injury the chordae tendinae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect

    A : The pacemaker will stop working
    B : The blood will tend to flow into the leftatrium
    C : The flow of blood into the pulmonary arterywill be reduced
    D : The flow of blood into the aorta will be slowed down


  •  
    .

     Correct answer is : C


  •   Question 3

    The nerve centres which control the body temperature and the urge for eating are contained in

    A : Pons
    B : Cerebellum
    C : Thalamus
    D : Hypothalamus


  •  
    .

     Correct answer is : A


  •   Question 4

    The plasmamembrane consistsmainly of

    A : Proteins embedded in a phospholipid bilayer
    B : Proteins embedded in a polymer of glucosemolecules
    C : Proteins embedded in a carbohydrate bilayer
    D : Phospholipids embedded in protein bilayer


  •  
    .

     Correct answer is : A


  •   Question 5

    In unilocular ovary with a single ovule the placentation is

    A : Basal
    B : Free Central
    C : Axile
    D : Marginal


  •  
    .

     Correct answer is : A


  •   Question 6

    The genetically-modified (GM) brinjal in India has been developed for

    A : Enhancing shelf life
    B : Enhanicing mineral content
    C : Drought-resistance
    D : Insect-resistance


  •  
    .

     Correct answer is : D


  •   Question 7

    Ringworm is humans is caused by

    A : Fungi
    B : Nematodes
    C : Viruses
    D : Bacteria


  •  
    .

     Correct answer is : A


  •   Question 8

    Which one of the following pair is incorrectlymatched

    A : Somatostatin - Delta cells (Source)
    B : Corpusluteum - Relaxin (secretion)
    C : Insulin - Diabetes mellitus (disease)
    D : Glucagon - Beta cells (source)


  •  
    .

     Correct answer is : D


  •   Question 9

    Widal test is used for the diagnosis of

    A : Pneumonia
    B : Tuberculosis
    C : Typhoid
    D : Malaria


  •  
    .

     Correct answer is : C


  •   Question 10

    Which one of the following is an example of ex-situ conseryation

    A : Seed bank
    B : Sacred groves
    C : National park
    D : Wildlife sanctuary


  •  
    .

     Correct answer is : A


  •   Question 11

    Whcih one of the following symbols and its representation used in human pedigree analysis is correct

    A : B :
    C : D :


  •  
    .

     Correct answer is : D


  •   Question 12

    The permissible use of the technique amniocentesis is for

    A : Artificial insemination
    B : Transjfer of embryo into the uterus of a surrogatemother
    C : Detecting any genetic abnormality
    D : Detecting sex of the unborn foetus


  •  
    .

     Correct answer is : C


  •   Question 13

    Some hyperthermophilic organisms that grow in highly acidic (pH2) habitats belong to the two groups

    A : Cyanobacteria and diatoms
    B : Protists and mosses
    C : Liverworts and yeasts
    D : Eubacteria and archaea


  •  
    .

     Correct answer is : D


  •   Question 14

    Which one of the following statements in regard to the excretion by the human kidneys is correct

    A : Distal convoluted tubule is incapable of reabsorbing HCO2- ?
    B : Nearly 99 per cent of the glomerular filtrate is reabsorbed by the renal tubules
    C : Ascending limb of loop of Henle is impermeable to electrolytes
    D : Descending limb of loop of Henle is impermeable to water


  •  
    .

     Correct answer is : B


  •   Question 15

    Which one of the following statements in regard to the excretion by the human kidneys is correct

    A : Distal convoluted tubule is incapable of reabsorbing HCO2- ?
    B : Nearly 99 per cent of the glomerular filtrate is reabsorbed by the renal tubules
    C : Ascending limb of loop of Henle is impermeable to electrolytes
    D : Descending limb of loop of Henle is impermeable to water


  •  
    .

     Correct answer is : B


  •   Question 16

    Which one of the following is not lateral meristem

    A : Interfascicular cambium
    B : Phellogen
    C : Intercalarymeristem
    D : Intrafascicular cambium


  •  
    .

     Correct answer is : C


  •   Question 17

    Single-celled eukaryotes included in

    A : Fungi
    B : Archaea
    C : Monera
    D : Protista


  •  
    .

     Correct answer is : D


  •   Question 18

    C4 plants are more efficient in photosynthesis than C3 plants due to

    A : Presence of larger number of chloroplasts in the leaf cells
    B : Presence of thin cuticle
    C : Lower rate fo photorespiration
    D : Higher leaf area


  •  
    .

     Correct answer is : A


  •   Question 19

    Which one of the following is used as vector for cloning genes into higher organisms

    A : Salmonell typhimurium
    B : Rhizopus nigricans
    C : Retrovirus
    D : Baculovirus


  •  
    .

     Correct answer is : C


  •   Question 20

    Which one of the following is not a micronutrient

    A : Magnesium
    B : Zinc
    C : Boron
    D : Molybdenum


  •  
    .

     Correct answer is : A


  •   Question 21

    Kranz anatomy is one of the characteristics of the leaves of

    A : Mustard
    B : Potato
    C : Wheat
    D : Sugarcane


  •  
    .

     Correct answer is : D


  •   Question 22

    The fruit flyDrosophilamelanogaster was found to be very suitbable for experimental verification of chromosomal theory of inheritance byMorgan and his colleagues because

    A : It completes life cycle in about two weeks
    B : It reproduces parthenogenetically
    C : A single mating produces two young flies
    D : Smaller female is easily recognisable from larger male


  •  
    .

     Correct answer is : A


  •   Question 23

    Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation

    A : Nitrogenase is insensitive to oxygen
    B : Leghaemoglobin scavenges oxygen and is pinkish in colour
    C : Nodules act as sites nitrogen fixation
    D : The enzyme nitrogenase catalyses the conversion of atmospheric N2 to NH3


  •  
    .

     Correct answer is : A


  •   Question 24

    Which one of the following can not be used for preparation of vaccines against plague

    A : Heat-Killed suspensions of virulent bacteria
    B : Formalin-inactivated suspensions of virulent bacteria
    C : Avirulent live baeteria
    D : Synthetic capsular polysaccharide material


  •  
    .

     Correct answer is : A


  •   Question 25

    One of the commonly used plant growth hormone in tea plantations is

    A : Indole-3-acetic acid
    B : Ethylene
    C : Abscisic acid
    D : Zeatin


  •  
    .

     Correct answer is : A


  •   Question 26

    The haemoglobin content per 100 ml of blood of a normal healthy adult is

    A : 12 - 16 g
    B : 5 - 11 g
    C : 25 - 30 g
    D : 17 - 20 g


  •  
    .

     Correct answer is : A


  •   Question 27

    Black (stem) rust of wheat is caused by

    A : Xanthomonas oryzae
    B : Alternaria solani
    C : Ustilago nuda
    D : Puccinia graminis


  •  
    .

     Correct answer is : D


  •   Question 28

    In human female the blastocyst

    A : Gets implanted in endometrium by the trophoblast cells
    B : Forms placenta even before implantation
    C : Gets implanted into uterus 3 days after ovulation
    D : gets nutrition from uterine endometrial secretion only after implantation


  •  
    .

     Correct answer is : A


  •   Question 29

    Which of the following are used in gene cloning

    A : Plamids
    B : Nucleoids
    C : Lomasomes
    D : Mesosomes


  •  
    .

     Correct answer is : A


  •   Question 30

    ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are possible



  •  
    .

     Correct answer is :


  •   Question 31

    Given below are four statements (a-d) regarding human blood circulatory system
    (a)Arteries are thick-walled and have narrow lumen as compared to veins
    (b) Angina is acute chest pain when the blood ciruclation of the brain is reduced
    (c) Persons with blood group AB can donate blood to any person with any blood group under ABO system
    (d) Calcium ions play a very important role in blood clotting
    Which two of the above statements are correct


    A : c and d
    B : a and d
    C : a and b
    D : b and c


  •  
    .

     Correct answer is : B


  •   Question 32

    Vegetative propagation in Pistia occurs by

    A : Sucker
    B : Stolen
    C : Offset
    D : Runner


  •  
    .

     Correct answer is : C


  •   Question 33

    Which one of the following pairs of structure is correctly matched with their correct description

    A : Premolars and molars = 20 in all and 3-rooted
    B : Tibia and fibula = Both form parts of knee joint
    C : Cartilage and cornea = No blood supply but do require oxygen for respiratory need
    D : Shoulder joint and elbow joint = Ball and socket type of joint


  •  
    .

     Correct answer is : C


  •   Question 34

    Secretions from which one of the following are rich in fructose, calcium and some enzymes

    A : Salivary glands
    B : Male accessory glands
    C : Liver
    D : Pancreas


  •  
    .

     Correct answer is : B


  •   Question 35

    When domestic sewagemixes with river water

    A : The river water is still suitable for drinking as impurities only about 0.1%
    B : Small animals like rats will die after drinking river water
    C : The increasedmicrobial activity releases micro-nutrients such as iron
    D : The increasedmicrobial activity uses up dissolved oxygen


  •  
    .

     Correct answer is : D


  •   Question 36

    Three of the following statements about enzymes are correct and one is wrong which one is wrong

    A : Most enzymes are proteins but some are lipids
    B : Enzymes require optimum pH for maximal activity
    C : Enzymes are denatured at high temperatures but in certain exceptional organisms they are effective even at tempreatures 80°- 90°C
    D : Enzymes are highly specific


  •  
    .

     Correct answer is : A


  •   Question 37

    Root development is promoted by

    A : Ethylene
    B : Abscisic acid
    C : Auxin
    D : Gibberellin


  •  
    .

     Correct answer is : C


  •   Question 38

    In which one of the following organisms its excretory organs are correctly stated

    A : Frog-Kidneys, skin and buccal epithelium
    B : Humans-Kidneys, sebaceous glands and tear glands
    C : Earthworm-Pharyngeal, integumentary and septal nephridia
    D : Cockroach-Malpighian tubules and enteric caeca


  •  
    .

     Correct answer is : C


  •   Question 39

    If for some reason the pariental cells of the gut epithelium become partially nonfunctional, what is likely to happen.

    A : Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones
    B : The pancreatic enzymes and specially the trypsin and lipase will not work efficiently
    C : The pH of stomach will fall abruptly
    D : Steapsin will bemore effective


  •  
    .

     Correct answer is : A


  •   Question 40

    Which one of the following is now being commercially produced by biotechnological procedures

    A : Insulin
    B : Nicotine
    C : Morphine
    D : Quinine


  •  
    .

     Correct answer is : A


  •   Question 41

    Transport of foodmaterial in higher plants takes place through

    A : Sieve elements
    B : Companion cells
    C : Transfusion cells
    D : Tracheids


  •  
    .

     Correct answer is : A


  •   Question 42

    The figure given below shows the conversion of a substrate into produced by an enzyme. In which one of the four option (1-4) the components of reaction labelled as A, B, C and D are identified correctly respectively.



    A : Activation energy with enzyme, Transition state, Activation energy without enzyme, Potential energy
    B : Potential energy,Transition state, Activation energy with enzyme, Activation energy without enzyme
    C : Transition state,Potential energy, Activation energy without enzyme, Activation energy with enzyme
    D : Potential energy,Transition state, Activation energy with enzyme, Activation energy without enzyme


  •  
    .

     Correct answer is : C


  •   Question 43

    An eleborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called.

    A : Cytoskeleton
    B : Thylakoid
    C : Endosplasmic Reticulum
    D : Plasmalemma


  •  
    .

     Correct answer is : A


  •   Question 44

    Given below is the diagram of a stomatal apparatus. In which of the folloiwng all the four parts Labelled asA, B, C and D are correctly identified.(respectively)



    A : Epidermal cell,Subsidiary cell,Stomatal aperture,Guard cell
    B : Subsidiary cell,Epidermal cell,Guard cell,Stomatal aperture
    C : Guard cell,Stomatal aperture,Subsidiary cell,Epidermal cell
    D : Epidermal cell,Guard cell,Stomatal aperture,Subsidiary cell


  •  
    .

     Correct answer is : A


  •   Question 45

    Which one of the following statements about the particular entity is true.

    A : DNA consists of a core of eight histones
    B : Centromere is found in animal cells, which produces aster during cell division
    C : The gene for producing insulin is present in every body cell
    D : Nucleosome is formed of nucleotides


  •  
    .

     Correct answer is : C


  •   Question 46

    Study the pathway given below In which of the following options correct words for all the three blanks A, B and C are indicated



    A : Carboxylation,Decarboxylation,Reduction
    B : Decarboxylaiton,Reduction,Regeneration
    C : Fixation,Transamination,Regeneration
    D : Fixation,Decrboxylaiton,Regeneration


  •  
    .

     Correct answer is : D


  •   Question 47

    Which one of the following is a xerophytic plant in which the stem ismodified into a flat, green and succulent structure

    A : Acacia
    B : Opuntia
    C : Casuarina
    D : Hydrilla


  •  
    .

     Correct answer is : B


  •   Question 48

    Examine the figures A, B, C and D. In which one of the four options all the items, A, B, C and D are correct



    A : Funaria,Adinatum,Salvinia,Riccia
    B : Chara,Marchantia,Fucus,Pinus
    C : Equisetum,Ginkgo,Selaginella,Lycopodium
    D : Selaginella,Equisetum,Salvinia,Ginkgo


  •  
    .

     Correct answer is : D


  •   Question 49

    The lac operon consists of

    A : Three regulatory genes and three structural genes
    B : Four regulatory genes only
    C : One regulatory gene and three structural genes
    D : Two regulatory genes and two structural genes


  •  
    .

     Correct answer is : C


  •   Question 50

    Given below is the diagram of a bacteriophage. In which one of the options all the four partsA, B,C and D are correct.



    A : Collar,Tail fibres,Head,Sheath
    B : Tail fibres,Head,Sheath,Collar
    C : Sheath,Collar,Head,Tail fibres
    D : Head,Sheath,Collar,Tail fibres


  •  
    .

     Correct answer is : D


  •   Question 51

    Which one of the following is the the correct description of a certain part of a normal human skeleton

    A : Glenoid cavity is a depression to which the thigh bone articulates
    B : Parietal bone and the temporal bone of the skull are joined by fibrous joint
    C : First vertebra is axis which articulates with the occipital condyles
    D : The 9th and 10th pairs of ribs are called the floating ribs


  •  
    .

     Correct answer is : B


  •   Question 52

    An example of endomycorrhiza is

    A : Rhizobium
    B : Nostoc
    C : Glomus
    D : Agaricus


  •  
    .

     Correct answer is : C


  •   Question 53

    Aestivation of petals in the flower of cotton is correctly shown is

    A : B :
    C : D :


  •  
    .

     Correct answer is : A


  •   Question 54

    Examine the figures (A-D) given below and select the right option out of 1-4, in which all the four structures A, B, C and D are identified correctly.



    A : Sucker,Seta, Megaspore mother cell, Gemma cup
    B : Rhizome,Sporangiophore,Polar cell, Globule
    C : Runner,Archegoniophore,Synergid, Antheridium
    D : Offset,Antheridiophore,Antipodals, Oogonium


  •  
    .

     Correct answer is : D


  •   Question 55

    Which of the following representations shows the pyramid of number in a forest ecosystem



    A : C
    B : D
    C : A
    D : B


  •  
    .

     Correct answer is : D


  •   Question 56

    Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character



    A : The male parent is homozygous dominant
    B : The female parent is heterozygous
    C : The parents could not have had a normal daughter for this character
    D : The trait under study could not be colour-blindness.


  •  
    .

     Correct answer is : D


  •   Question 57

    The correct floral formula of soyabean is

    A : B :
    C : D :


  •  
    .

     Correct answer is : A


  •   Question 58

    The 3'-5' phosphodiester linkages inside a polynucleotide chain serve to join

    A : One nitrogenous base with pentose sugar
    B : One DNA strand with the other DNA strand
    C : One nucleoside with another nucleoside
    D : One nucleotide with another nucleotide


  •  
    .

     Correct answer is : D


  •   Question 59

    In genetic engineering, a DNA segment (gene) of interest, is transferred to the host cell through a vector. Consider the following four agents (A-D) in this regard and select the correct option about which one or more of these can be used as a vector/vectors:
    (A) a bacterium
    (B) plasmid
    (C) plasmodium
    (D) bacteriophage


    A : B abd D
    B : A,B and D
    C : A only
    D : A and C only


  •  
    .

     Correct answer is : A


  •   Question 60

    Study the cycle shown below and select the option which gives correct words for all the four blanks A, B, C and D.



    A : Denitrification,Nitrificaiton,Plants Animals
    B : Nitrification,Ammonification,Animals,Plants
    C : Denitrification,Ammonification,Plants, Animals
    D : Nitrification,Denitrification,Animals, Plants


  •  
    .

     Correct answer is : C


  •   Question 61

    Ureters act as urogenital ducts in



  •  
    .

     Correct answer is : 4


  •   Question 62

    The type of muscles present in our :



  •  
    .

     Correct answer is : 3

     Solution :
      Thigh muscles are skeletal muscle that are striated and voluntary.

  •   Question 63

    Pure Si at 500K has equal number of electron (ne) and hole (nh) concentrations of 1.5 * 1016 m?-3. Doping by indium increases nh to 4.5 * 1022 m?-3. The doped semiconductor is of :



  •  
    .

     Correct answer is : 4

     Solution :
      ni2 = nenh


    ne = 0.5 *1010
    nh = 4.5 *1022
    nh >>ne
    Trivalent impurity
    →p type semiconductor

  •   Question 64

    Read the following four statements (A-D) about certain mistakes in two of them
    (A) The first transgenic buffalo, Rosie produced milk which was human alpha-lactal bumin enriched.
    (B) Restriction enzymes are used in isolation of DNA from other macro-molecules.
    (C) Downstream processing is one of the steps of R-DNA technology.
    (D) Disarmed pathogen vectors are also used in transfer of R-DNA into the host.
    Which are the two statements having mistakes ?




  •  
    .

     Correct answer is : 4

     Solution :
      Transgenic Rosie is actually cow Restriction enzymes cut the DNA at specific site The separation of DNA is performed by Gel electrophorasis

  •   Question 65

    The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone :



  •  
    .

     Correct answer is : 4

     Solution :
      Responsible for circadian cycle

  •   Question 66

    Guttation is the result of :



  •  
    .

     Correct answer is : 4

     Solution :
      Guttation is due to root pressure.

  •   Question 67

    Examine the figure given below and select the right option giving all the four parts (a, b, c and d) correctly identified.





  •  
    .

     Correct answer is : 1


  •   Question 68

    Three of the following pairs of the human skeletal parts are correctlymatched with their respective inclusiveskeletal category and one pair is not matched. Identify the non-matching pair



  •  
    .

     Correct answer is : 2

     Solution :
      Glenoid cavity found in pectoral girdle

  •   Question 69

    Which one of the following aspects is an exclusive characteristic of living things ?



  •  
    .

     Correct answer is : 3


  •   Question 70

    "Good ozone " is found in the :



  •  
    .

     Correct answer is : 3


  •   Question 71

    Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct ?



  •  
    .

     Correct answer is : 3

     Solution :
      Clostridium butylicum form butyric acid

  •   Question 72

    The logistic population growth is expressed by the equation



  •  
    .

     Correct answer is : 2


  •   Question 73

    Two identical piano wires kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats/s when both the wires oscillate together would be :



  •  
    .

     Correct answer is : 1

     Solution :
      1/2l * √(F/µ) = f (for fundamentalmode)
    l and µ are constant
    Taking ln on both side & differentiating
    = dF/2F = df/f
    = dF/F = 2*df/f
    =2 * 6/600 = 0.02

  •   Question 74

    In the following figure, the diodes which are forward biased, are :





  •  
    .

     Correct answer is : 2

     Solution :
      Only in (a) and (c),
    Diodes are forward biased
    As p?type should be higher potential & n?type at lower potential.

  •   Question 75

    The threshold frequency for a photosensitive metal is 3.3 * 1014 Hz. If light of frequency 8.2 * 1014 Hz is incident on this metal, the cut-off voltage for the photoelectric emission is nearly :



  •  
    .

     Correct answer is : 1

     Solution :
      KE = hv - hvth =eV00 = h/e * (8.2 * 1014 - 3.3 * 1014

  •   Question 76

    A galvanometer of resistance, G is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is :



  •  
    .

     Correct answer is : 3

     Solution :
      G = GS/(S+G) + S'
    G- GS/(S+G) = S'
    S' = G2 /(S+G)


  •   Question 77

    A square loop, carrying a steady current I, is placed in a horizontal plane near a long straight conductor carrying a steady current I1 at a distance d from the conductor as shown in figure. The loop will experience





  •  
    .

     Correct answer is : 4

     Solution :
      F1 > F2. hence net attraction force will be towards conductor.


  •   Question 78

    A thermocouple of negligible resistance produces an e.m.f. of 40 µV/°C in the linear range of temperature. A galvanometer of resistance 10ohm whose sensitivity is 1µA/div, is employed with the termocouple. The smallest value of temperature difference that can be detected by the system will be :



  •  
    .

     Correct answer is : 4

     Solution :
      1 division = 1µA
    current for 1°C = 40µ/10 = 4µA
    1µA = 1/4 °C = 0.25°C

  •   Question 79

    The r.m.s. value of potential difference V shown in the figure is :





  •  
    .

     Correct answer is : 2



  •   Question 80

    A coil has resistance 30 ohm and inductive reactance 20 Ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be :



  •  
    .

     Correct answer is : 1

     Solution :
      R = 30 Ω
    XL = 20 Ω = Lω
    f = 50 Hz
    XL' = 20/50 * 100= 40 Ω (Θ ω' = 2ω)
    Z = √(R2 + XL'2) = 50 Ω
    Imax = 200/50 = 4A


  •   Question 81

    A particle of mass m is thrown upwards from the surface of the earth, with a velocity u. The mass and theradius of the earth are , respectively,Mand R. G is gravitational constant and g is acceleration due to gravityon the surface of the earth. The minimum value of u so that the particle does not return back to earth, is :



  •  
    .

     Correct answer is : 1

     Solution :
      GM = gR2
    =Ve = √(2gR)
    =√(2GM/R2)*R
    =√(2GM/R)

  •   Question 82

    Azener diode, having breakdown voltage equal to 15V, is used in a voltage regulator circuit shown in figure. The current through the diode is :





  •  
    .

     Correct answer is : 4

     Solution :
      Voltage across zener diode is constant
    (i)1kΩ 15 volt / 1kΩ = 15mA
    (i)250Ω (20-15)volt / 250Ω = 20mA
    (i)zener diode = 20-15 =5mA


  •   Question 83

    A particle covers half of its total distance with speed v1 and the rest half distance with speed v2. Its average speed during the complete journey is :



  •  
    .

     Correct answer is : 2

     Solution :
      Vav = S+S/(S/V1 + S/V2) = 2v1 v2 / ( v1 + v2)

  •   Question 84

    The electric potential V at any point (x, y, z), all in meters in space is given by V = 4x2 volt. The electric field at the point (1, 0, 2) in volt/meter is :



  •  
    .

     Correct answer is : 4



  •   Question 85

    A short bar magnet of magnetic moment 0.4J T?-1 is place in a uniform magnetic field of 0.16 T. The magnet is stable equilibrium when the potential energy is:



  •  
    .

     Correct answer is : 1

     Solution :
      For stable equilibrium U =-?MB
    =-(0.4) (0.16)
    = ?-0.064 J

  •   Question 86

    A thin prism of angle 15° made of glass of refractive index µ1 = 1.5 is combined with another prism of glass of refractive index µ2 = 1.75. the combination of the prism produces dispersion without deviation . The angle of the second prism should be:



  •  
    .

     Correct answer is : 2

     Solution :
      Deviation = zero
    So, δ = δ1 + δ2 = 0
    ( µ1 -1)A1 + (µ2 -1)A2 = 0
    A2=-0.5/0.75 * 15°
    A2=-10°

  •   Question 87

    Aconveyor belt ismoving at a constant speed of 2m/s.Abox is gently dropped on it. The coefficient of friction between them is µ= 0.5. The distance that the box will move relative to belt before coming to rest on it taking g = 10 ms-?2, is



  •  
    .

     Correct answer is : 4

     Solution :
      a = µg =5
    v2 = u2 + 2as
    Find s using above equations

  •   Question 88

    A mass of diatomic gas (γ = 1.4) at a pressure of 2 atmospheres is compressed adiabatically so that its temperature rise from 27°C to 927°C. The pressure of the gas is final state is :



  •  
    .

     Correct answer is : 3



  •   Question 89

    A mass m moving horizontally (along the x-axis) with velocity v collides and sticks to mass of 3m moving vertically upward (along the y-axis) with velocity 2v. The final velocity of the combination is :



  •  
    .

     Correct answer is : 1

     Solution :
      From momentum conservation
    mvî + 3m(2v)ĵ = (4m)v̂
    v̂ = (v/4)î + (6/4)vĵ
    =(v/4)î + (3/2)vĵ

  •   Question 90

    Two particle are oscillating along two close parallel straight lines side by side, with the same frequency and amplitudes. They pass each other, moving in opposite directions when their displacement is half of the amplitude. The mean positions of the two particles lie on a straight line perpendicular to the paths of the two particles. The phase difference is :



  •  
    .

     Correct answer is : 2



  •   Question 91

    A small mass attached to a string rotates on frictionless table top as shown. If the tension is the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2, the kinetic energy of the mass will:





  •  
    .

     Correct answer is : 3

     Solution :
      KE = L2/2I
    From angular momemtum conservation about centre
    L → constant
    I = mr2
    KE' = L2/2mr'2
    r' = r/2
    KE' = 4KE
    K.E. is increased by a factor of 4

  •   Question 92

    The density of material in CGS system of units is 4g/cm3. In a system of units in which unit of lengths is 10 cm and unit of mass is 100 g, the value of density of material will be :



  •  
    .

     Correct answer is : 2

     Solution :
      U2 = U1 * (M1 / M2 ) * (L1 / L2 )-3
    4 * (1/100)(1/10)-3
    =40

  •   Question 93

    An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitivematerial having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, the value of n is :



  •  
    .

     Correct answer is : 2

     Solution :
      KEmax =10eV
    φ = 2.75 eV
    E = φ + KE = 12.75eV
    Energy difference between n = 4 and n = 1
    value of n = 4

  •   Question 94

    A particle of mass M is situated at the centre of spherical shell of mass and radius a. The magnitude of the gravitational potential at a point situated at a/2 distance from the centre, will be:



  •  
    .

     Correct answer is : 2



  •   Question 95

    Two radioactive nuclei P and Q, in a given sample decay into a stable nucleolus R. At time t = 0, number of P species are 4 N0 and that of Q are N0. Half-life of P (for conversion to R) is 1 minute where as that of Q is 2 minutes. Initially there are no nuclei of R present in the sample. When number of nuclei of P and Q are equal, the number of nuclei of R present in the sample would be



  •  
    .

     Correct answer is : 2

     Solution :
      P→4N0
    Q→N0
    Half time TP=1min
    TQ = 2min
    Let after time t number of nuclie of P and Q are equal that is 4N0 /2t/1
    =N0/2t/2
    4/2t/2=1
    t = 4min
    NP=N0/4
    at t=4min.
    NQ = N0/24/2
    N0/4
    popu of R= (4N0 -N0)+(N0-N0/4)

  •   Question 96

    A projectile is fired at an angle of 45° with the horizontal. Elevation angle of the projectile at its highest point as seen from the point of projection is :



  •  
    .

     Correct answer is : 2

     Solution :
      RtanΘ = 4Hmax
    R * tan 45° = 4Hmax
    Hmax = R/4
    tan φ =Hmax/(R/2)
    =1/2

  •   Question 97

    Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr?s atomic model?



  •  
    .

     Correct answer is : 2



  •   Question 98

    In the circuit shown in the figure, if potential at point A is taken to be zero the potential at point B is :





  •  
    .

     Correct answer is : 4

     Solution :
      Current through DC = 2 - 1 = 1 A from D to C
    Path DBCB
    VC = 1V
    VDC =2*1=2V
    VB =0 + 1 + 2V -2V

  •   Question 99

    A conversing beam of rays is incident on a diverging lens. Having passed though the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meets will move 5 cm closer to the lens. The focal length of the lens is :



  •  
    .

     Correct answer is : 3

     Solution :
      u=10cm
    v=15cm
    f=?
    use -1/u + 1/v =1/f
    f=-30cm

  •   Question 100

    Three charges, each +q, are placed at the corners of an isosceles triangle ABC of sides BC and AC, 2a. D and E are the mid points of BC and CA. The work done in taking a charge Q from D to E is:





  •  
    .

     Correct answer is : 3



  •   Question 101

    Which of the following statements is not valid for oxoacids of phosphorus ?

    A : All oxoacids contain tetrahedral four coordinated phosphorous
    B : All oxoacids contain atleast one P = O units and one P - OH group
    C : Orthophosphoric acid is used in the manufacture of triple superphosphate
    D : Hypophosphorous acid is a diprotic acid


  •  
    .

     Correct answer is : D



  •   Question 102

    Identify the alloy containing a non-metal as a constituent in it

    A : Bell metal
    B : Bronze
    C : Invar
    D : Steel


  •  
    .

     Correct answer is : D

     Solution :
      Steel → Fe + C

  •   Question 103

    The pair of species with the same bond order is

    A : NO, CO
    B : N2, O2
    C : O2-2, B2
    D : O2+,NO+


  •  
    .

     Correct answer is : C

     Solution :
      Both have one

  •   Question 104

    Bond order of 1.5 is shown by:

    A : O22-
    B : O2
    C : O2+
    D : O2-


  •  
    .

     Correct answer is : D

     Solution :
      O2- B.O =1.5

  •   Question 105

    Which one of the following is a mineral of iron ?

    A : Pyrolusite
    B : Magnetite
    C : Malachite
    D : Cassiterite


  •  
    .

     Correct answer is : B

     Solution :
      Fe2O3

  •   Question 106

    Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air ?

    A : Li
    B : Na
    C : Rb
    D : K


  •  
    .

     Correct answer is : A

     Solution :
      4Li + O2 → 2Li2O

  •   Question 107

    The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is :

    A : A>B>C>D
    B : A>C>B>D
    C : B>A>D>C
    D : B>D>C>A


  •  
    .

     Correct answer is : C

     Solution :
      Acidicstrength due to I-effect

  •   Question 108

    In the following reaction :



    A : B :
    C : D :


  •  
    .

     Correct answer is : C



  •   Question 109

    Which nomenclature is not according to IUPAC system ?.

    A : B :
    C : D :


  •  
    .

     Correct answer is : C

     Solution :
      Correct Name - 3 Bromo propene

  •   Question 110

    Among the following compounds the one that is most reactive towards electrophilic nitration is :

    A : Toluene
    B : Benzene
    C : Benzoic acid
    D : Nitrobenzene


  •  
    .

     Correct answer is : A

     Solution :
      Due to +R effect of methyl group A) is more reactive towards ESR (Nitration).

  •   Question 111

    Deficiency of vitamin B1 causes the disease

    A : Cheilosis
    B : Sterility
    C : Convulsions
    D : Beri-Beri


  •  
    .

     Correct answer is : D

     Solution :
      Deficiency of B1 cause Beri-Beri.

  •   Question 112

    Which one of the following sets of monosaccharides forms sucrose ?

    A : α-D-Glucopyranose and β-D-fructofuranose
    B : β-D-Glucopyranose and α-D-fructofuranose
    C : α-D-Glucopyranose and α-D-fructofuranose
    D : α-D-Glucopyranose and β-D-fructofuranose


  •  
    .

     Correct answer is : D



  •   Question 113

    Which one of the following statements regarding photochemical smog is not correct ?:

    A : Photochemical smog is formed through photochemical reaction involving solar energy
    B : Photochemical smog does not cause irritation in eyes and throat
    C : Carbon monoxide does not play any role in photochemical smog formation
    D : Photochemical smog is an oxidising agent in character


  •  
    .

     Correct answer is : B

     Solution :
      Photo chemical smog causes irritation in eyes & throat

  •   Question 114

    In the following sequence of reactions



    A : Acetaldehyde
    B : Ethyl alcohol
    C : Acetone
    D : Methane


  •  
    .

     Correct answer is : B



  •   Question 115

    Which one of the following is not a condensation polymer ?

    A : Dacron
    B : Neoprene
    C : Melamine
    D : Glyptal


  •  
    .

     Correct answer is : B


  •   Question 116

    Predict the products in the given reaction



    A : B :
    Pairs of skeletalpartsCategory