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Previous Year Questions

TLS Online TPP Program

QUESTION ID:1

If then which of the following options is TRUE?


QUESTION ID:2

The Headmaster ___________ to speak to you.
Which of the following options is incorrect to complete the above sentence?

QUESTION ID:3

Mahatma Gandhi was known for his humility as

QUESTION ID:4

All engineering students  should learn mechanics, mathematics and  how to do computation.
       I                                                  II                                           III                                           IV
Which of the above underlined parts of the sentence is not appropriate?

QUESTION ID:5

Select the pair that best expresses a relationship similar to that expressed in the pair:
water: pipe::

QUESTION ID:6

Velocity of an object fired directly in upward direction is given by V = 80 − 32 t, where t (time) is in seconds. When will the velocity be between 32 m/sec and 64 m/sec?

QUESTION ID:7

In a factory, two machines M1 and M2 manufacture 60% and 40% of the autocomponents respectively. Out of the total production, 2% of M1 and 3% of M2 are found to be defective. If a randomly drawn autocomponent from the combined lot is found defective, what is the probability that it was manufactured by M2?

QUESTION ID:8

Following table gives data on tourists from different countries visiting India in the year 2011

Which two countries contributed to the one third of the total number of tourists who visited India in 2011?

QUESTION ID:9

If |−2X + 9| = 3 then the possible value of |−X| − X2 would be:

QUESTION ID:10

All professors are researchers
Some scientists are professors
Which of the given conclusions is logically valid and is inferred from the above arguments:

QUESTION ID:11

N(CH3)3 and N(SiH3)3are congeners, but around N-atom the former has pyramidal geometry whereas the latter is nearly planar. The bonding responsible for planarity of N(SiH3)3is

QUESTION ID:12

The type of electronic transition responsible for the yellow colour of K2CrO4 is

QUESTION ID:13

The given equation
 
where H, T and CP are the enthalpy, temperature and heat capacity at constant pressure, respectively, is called

QUESTION ID:14

The number of 2-center-2-electron bonds in anhydrous AlCl3 is ___________

QUESTION ID:15

When dissolved in water, the number of H+ ions released from a molecule of H3BO3is _________

QUESTION ID:16

In NaCl crystal, the arrangement and coordination number of the ions are

QUESTION ID:17

The solubility product (Ksp) of Ca3(PO4)2 is 1.3 ×10-32. In a 0.02 M solution of Ca(NO3)2, the solubility of Ca3(PO4)2 (in units of M) is

QUESTION ID:18

Identify the CORRECT product in the following reaction:


QUESTION ID:19

The major product obtained in the following reaction is 


QUESTION ID:20

Iodine forms an anionic species Q in aqueous solution of iodide(I-). The number of lone pair(s) of electrons on the central atom of Q is __________

QUESTION ID:21

The rate of a chemical reaction is tripled when the temperature of the reaction is increased from 298 K to 308 K. The activation energy (in kcal mol-1 K-1, up to one decimal place) for the reaction is(Given R = 1.987cal mol-1 K-1) _____________

QUESTION ID:22



QUESTION ID:23

Consider the following SN2 reaction of optically pure 1-chloro-3-ethylcyclopentane (X).


The structure of Y in the above reaction is


QUESTION ID:24

The absolute configuration of1-chloro-3-ethylcyclopentane (X) shown above is

QUESTION ID:25

The molar conductance at infinite dilution of sodium acetate, sodium sulfate and sulfuric acid solutions are
91.0 ×10-4, 259.8×10-4 and 859.3×10-4S m2 mol-1, respectively.
The molar conductance at infinite dilution (in S m2 mol-1)of acetic acid is

QUESTION ID:26

The molar conductance at infinite dilution of sodium acetate, sodium sulfate and sulfuric acid solutions are
91.0 ×10-4, 259.8×10-4 and 859.3×10-4S m2 mol-1, respectively.
If the molar conductance of an acetic acid solution is15.2 ×10-4Sm2 mol-1,then the percentage (%) dissociation of acetic acid in the solution will be

QUESTION ID:27

Which one of the following statements is TRUE when a cell is kept in a hypotonic solution?

QUESTION ID:28

Which one of the following amino acids has a higher propensity for cis peptide bond formation?

QUESTION ID:29

The length of an alpha -helix composed of 36 amino acid residues is

QUESTION ID:30

The order n for a given substrate concentration in an enzyme catalyzed reaction following Michaelis-Menten kinetics, is

QUESTION ID:31

Which one of the following amino acid residues is specifically recognised by chymotrypsin mduring peptide bond cleavage?

QUESTION ID:32

The terminal electron acceptor during mitochondrial respiration is

QUESTION ID:33

During the biosynthesis of urea in the urea cycle, the two nitrogen atoms are derived from

QUESTION ID:34

An enzyme has two binding sites for an inhibitor molecule. When the inhibitor binds to the first site, the dissociation constant of the inhibitor for the second site increases, leading to negative co-operativity. The Hill coefficient for such an inhibitor is

QUESTION ID:35

An oligonucleotide was sequenced by the dideoxy method of Sanger and the following autoradiogram was obtained
The sequence of the oligonucleotide is

QUESTION ID:36

In different types of tissue transplantations, the rate of graft rejection in decreasing order is

QUESTION ID:37

You have prepared 1.0 liter of 0.5 M acetate buffer (pH=5.0). The dissociation constant of acetic acid is 1.7×10-5 M. What would be the acetate ion concentration in the buffer?

QUESTION ID:38

The following figures show the plot of reaction rate versus substrate concentration (mM) for an enzyme catalyzed reaction in the presence and absence of an inhibitor. Match the possible reaction types with the plots.
(P) Competitive inhibition (Q) Substrate inhibition (R) Michaelis-Menten (S) Non-competitive inhibition

QUESTION ID:39

Arrange the following in the decreasing order of their permeability coefficients across a lipid bilayer membrane.
(i) Urea
(ii) Glucose
(iii) H2O
(iv) Na+
(v) Tryptophan

QUESTION ID:40

Arrange the following in the increasing order of amount of ATP generated by metabolism of one molecule of the following compounds.
(i) Anaerobic catabolism of starch with 300 glucose units
(ii) Aerobic catabolism of glucose
(iii) Aerobic catabolism of acetate
(iv) Aerobic catabolism of palmitate

QUESTION ID:41

Match the following enzymes with their regulatory mechanism
(a) Phosphofructokinase                 1. Product inhibition
(b) Glycogen synthase                    2. Control of enzyme synthesis
(c) β-galactosidase                          3. Allosteric interaction
(d) Lactate dehydrogenase            4. Covalent modification

QUESTION ID:42

A researcher wants to clone 3 DNA fragments of sizes 1.1 Mb, 0.097 Mb and 0.045 Mb. The choice of the vectors for cloning each of the fragments are

QUESTION ID:43

Which of the four restriction enzymes given below cut the following DNA sequence?
5’-CCGATATCTCGAGGGC-3’
(P) BamH1 (3’-CCTAG^G-5’)
(Q) XhoI (3’-GAGCT^C-5’)
(R) EcoRI (3’-CTTAA^G-5’)
(S) EcoRV (3’-CTA^TAG-5’)

QUESTION ID:44

You have expressed the following protein that has an isoelectric point of 6.0. The best order of protein purification methodologies to obtain a pure protein is?

QUESTION ID:45

An enzyme of 40 kDa is added to a substrate solution in a molar ratio of 1:3. The concentration of the enzyme in the mixture is 12 mg/ml. What would be the corresponding substrate concentration?

QUESTION ID:46

A patient suffering from pneumonia and tuberculosis was found to have very low CD4+ T cells. In all probability the PRIMARY causative infectious agent belongs to

QUESTION ID:47

Bast fibres are present in

QUESTION ID:48

During cellular respiratory process, pyruvate must be oxidized to acetyl CoA and CO2 before it enters the citric acid cycle. The corresponding simplified equation is

This oxidation reaction occurs in mitochondria and is carried out in presence of the enzyme

QUESTION ID:49

Which one of the following statements having the terms - gene, chromosome and genome is CORRECT?

QUESTION ID:50

The aflatoxin found in post-harvested grains is injurious to health due to

QUESTION ID:51

Identify the event that exclusively occurs in meiotic cell division

QUESTION ID:52

In the symbiotic nitrogen fixation process, Leghemoglobin present in the nodule helps in fixing nitrogen in presence of the enzyme

QUESTION ID:53

Considering environment and ecosystem, identify the INCORRECT statement

QUESTION ID:54

The two enzymes commonly used for isolation of protoplasts from plants are

QUESTION ID:55

For successful transfer of a foreign gene from the engineered Ti-plasmid to the plant genome, few cis-acting DNA elements and trans-acting protein factors are very much essential. Select the CORRECT combination from the following

QUESTION ID:56

In naturally occurring cytoplasmic male sterility, the molecular determinant is located in

QUESTION ID:57

Identify the floral formula with the family and the corresponding plant species


QUESTION ID:58

plant of genotype GGHH is crossed with another plant of the genotype gghh. If the F1 is test crossed, what percentage (%) of the test cross progeny will have the genotype gghh when the two genes are -
(P) unlinked,
(Q) completely linked with no crossing over,
(R) 10 m.u. (genetic map unit) apart,
(S) 24 m.u. apart?

QUESTION ID:59

Which two of the following are the CORRECT statements ?
P. Nondisjunction in the parental meiosis is not essential to produce diploid organisms
Q. Nondisjunction in the parental meiosis is essential to produce aneuploid organisms
R. Nondisjunction in the parental meiosis is essential to produce hexaploid organisms
S. Nondisjunction in the parental meiosis is essential to produce tetraploid organisms

QUESTION ID:60

Identify the correct matching by taking one item from each column


QUESTION ID:61

Which two of the following are the INCORRECT statements ?
P. All plants fix CO2 by the action of ribulose biphosphate carboxylase. The reaction occurs in the bundle sheath of C4 plants
Q. All plants fix CO2 by the action of ribulose biphosphate carboxylase. The reaction occurs in the mesophyll cells of C4 plants
R. Phosphoenol pyruvate + CO2             Oxaloacetate + Pi, catalyzed by the enzyme phosphoenol pyruvate carbxylase occurs in the mesophyll cells of C4 plants
S. Phosphoenol pyruvate + CO2                Oxaloacetate + Pi, catalyzed by the enzyme phosphoenol pyruvate dehydrogenase occurs in the mesophyll cells of C4 plants

QUESTION ID:62

Select the CORRECT set comprising only the synthetic analogues of auxin and cytokinin

QUESTION ID:63

Which two of the following are the INCORRECT statements ?
P. In monocotyledonous stems with closed vascular bundle, secondary growth takes place without any cambium
Q. In dicotyledonous stems hypodermis is collenchymatous
R. Mobilization of storage reserves takes place during post-germination of embryo
S. Osborne’s classification of seed storage proteins is based upon solubility in n-hexane

QUESTION ID:64

Identify two CORRECT characteristic features of (P) Autogamy and (Q) Allogamy from the following statements
1. Plant species usually does not depend on external agents
2. Plant species usually depends on external agents
3. Plant species normally produces progeny that are healthier and better adapted in nature
4. Plant species normally produces weaker progeny in several generations

QUESTION ID:65

Identify the correct matching by taking one item from each column


QUESTION ID:66

Identify two CORRECT statements from the following which are related to the ion transportation in the root system of plant
P. The proton pumps and H+-pyrophosphatase appear to work in anti-parallel with the vacuolar ATPase to create a proton gradient across the tonoplast
Q. Calcium is one of the important ion whose concentration is strongly regulated by the concentration of apoplastic spaces in the millimolar level
R. Solute move through both apoplast and symplast, and xylem parenchyma cells participate in xylem loading
S. The limitation of Nerst equation for relating the membrane potential to the distribution of ion at equilibrium is that it cannot distinguish between active and passive transport

QUESTION ID:67

In 1976, Tonegawa’s experiment gave clue about gene rearrangement during differentiation of B- cells. The two different types of cells used in this experiment were

QUESTION ID:68

To which one of the following groups, the antibiotics kanamycin, streptomycin and gentamicin belong

QUESTION ID:69

Shine Dalgarno’s sequence present in mRNA binds to

QUESTION ID:70

Which one of the following transport mechanism is NOT employed by prokaryotes?

QUESTION ID:71

The most common indicator organism of faecal pollution in water is

QUESTION ID:72

The theoretical maximum number of ATP molecules produced from aerobic oxidation of glucose by eukaryotic cells is

QUESTION ID:73

Which one of the following DO NOT use water as an electron source during photosynthesis?

QUESTION ID:74

If the radius of a spherical coccus is 0.8 μm, the value of surface area/volume  in μm-1 will be

QUESTION ID:75

The enzyme that catalyzes the reduction of nitrogen to ammonia is

QUESTION ID:76

Chemostat is a continuous culture system in which sterile medium is fed into the culture vessel at the same rate as the spent medium is removed. If in a chemostat culture, the flow rate is 30 ml h-1 and volume of the medium inside the vessel is 100 ml, the dilution rate in h-1 is

QUESTION ID:77

In an experiment the structural genes lacZYAof lac operon were found to be constitutively expressed. The following explanations were given for the constitutive expression
(P) absence of a functional repressor due to mutation in the repressor gene lacI
(Q) mutation in the operator that can no longer bind the repressor
(R) mutation in the lacAgene
Which of the following is CORRECT

QUESTION ID:78

Which one of the following is TRUE about siderophores in bacteria?

QUESTION ID:79

In a population containing fast and slow growing bacteria, the slow growing bacteria can be enriched by supplementing the medium with

QUESTION ID:80

When the supply of tryptophan is plentiful, the tryptophan operon is repressed because the

QUESTION ID:81

Match the scientists in Group I with their contributions in microbiology in Group II

QUESTION ID:82

Match the infectious agents in Group I with the associated diseases in Group II


QUESTION ID:83

Match the microscopes in Group I with their working principles in Group II


QUESTION ID:84

In a phenol coefficient test for determining the efficacy of a disinfectant X, the maximum effective dilution for X and phenol was found to be 1/450 and 1/90, respectively. Calculate the phenol coefficient for X.

QUESTION ID:85

How many electrons are accepted when sulfate acts as the terminal electron acceptor in bacteria such as Desulfovibrio?

QUESTION ID:86

A bacterial population increases from 103 cells to 109 cells in 10 h. Calculate the number of generations per hour.

QUESTION ID:87

Which one of the following provides the strongest support for the theory of “descent with modification”?

QUESTION ID:88

Which one of the following is an example of sympatric speciation?

QUESTION ID:89

The primary difference between glycogen and cellulose is in the

QUESTION ID:90

Control mechanisms operate at any of the several steps involved in gene expression. Which one of the following is the key mode of regulation during the cell cycle?

QUESTION ID:91

Testicular feminization syndrome is a genetic condition wherein an individual with a XY genotype will have an external female-like phenotype. This is caused by

QUESTION ID:92

Which one of the following defects do you expect to see if you were able to specifically block apoptosis in the developing limb bud of a frog embryo?

QUESTION ID:93

The formation of antigen-antibody complex helps in disposing antigen through the following pathways EXCEPT:

QUESTION ID:94

The term “ecological succession” refers to:

QUESTION ID:95

Which one of the following options provide example for the term “habituation” in behavioral ecology?

QUESTION ID:96

Among the following cell structure-function pairs, identify the correctly paired one

QUESTION ID:97

Which of the following most accurately states the goal of systematics?

QUESTION ID:98

Among the following options, choose the one that is probably a cause of rapid diversification of animal groups during the Cambrian explosion.

QUESTION ID:99

A newly discovered, recessively-inherited disease-susceptibility trait (DS) is observed only in cotton plants with white flowers, although the flower colour (R) and DS are independently inherited. In a breeding programme, one variety that is homozygous for the absence of DS, but heterozygous for R was mated to another having white flowers but heterozygous for DS. What is the probability that a given plant among the cross progeny will be susceptible to the disease?

QUESTION ID:100

In a new species of moth, the genes for body colour (black, B, is dominant over grey, b), wing size (normal wing, W, is dominant over vestigial, w) and eye colour (red, R, is dominant over white, r) are linked. In this species, only one cross-over event has been observed between any two homologous chromosomes during meiosis. In a cross between BB; ww and bb; WW, 5 % of the progeny were black with normal wings. In a separate cross between RR; WW and rr; ww, 15 % of the progeny were red-eyed with vestigial wings. In a third cross between BB; rr and bb; RR, 10 % of the progeny were black-coloured with red eyes. Which among the following is the correct order
of these three genetic loci?

QUESTION ID:101

In vertebrates, the variations in the structure and function of nephrons are directly linked to the osmoregulatory requirements of the organisms depending on the habitats they live in. From the options given below, identify the correct combination that truly represents the adaptation seen in desert mammals:
i. Long loops of Henle
ii. Short loop of Henle
iii. Hyperosmotic urine
iv. Large volume of urine
v. Removal of nitrogen as uric acid

QUESTION ID:102

In Drosophila, mutations in homeotic genes result in which one of the following developmental defects?

QUESTION ID:103

Retroviruses, like the influenza virus, escape the detection of pre-existing antibodies in the host by generating surface antigen variants. They do so:

QUESTION ID:104

The relative number of individuals in each age group is an important demographic factor for the study of future growth trends, and this is normally depicted in the form of an age-structure pyramid. Based on your understanding on population dynamics, match the following distribution properties of age structure (Group 1) with the individual forecast given (Group 2):
Group 1
I). Uniform age distribution in the pyramid
II). Distribution skewed towards younger age groups
III). Distribution skewed towards older age groups
IV). Reduction in the number of males in the middle age group
Group 2
i). Emigration in the recent past and the possible increase in the older age groups in the near future.
ii). Likely to be a stable population
iii). Possible unemployment in the near future
iv). Increased government expenditure on medical needs and social security related issues in the near future

QUESTION ID:105

Like any other trait, animal behavior also evolves by natural selection. Which one of the following examples is NOT true with regard to the evolution of behavior by natural selection?

QUESTION ID:106

Among the following molecular process-biological effect pairs, identify the mismatched pair.

QUESTION ID:107

Kawashiorkor disease is caused due to the deficiency of

QUESTION ID:108

Which of the following statements is TRUE in case of oxidative rancidity of vegetable oils and fats?

QUESTION ID:109

The food borne disease, Q fever is caused by the organism

QUESTION ID:110

The primary bacterial spoilage of poultry meat at low temperature, with characteristic sliminess at outer surface, is caused by

QUESTION ID:111

The weight gain (in gram) per gram protein consumed is called

QUESTION ID:112

Which of the following carbohydrates is NOT classified as dietary fibre?

QUESTION ID:113

In the extruder barrel, the compression is achieved by back pressure created by the die and by

QUESTION ID:114

The brown colour of bread crust during baking is due to Maillard reaction between

QUESTION ID:115

Blanching influences vegetable tissues in terms of

QUESTION ID:116

When garlic is cut or processed, the crushed garlic odour is due to the formation of

QUESTION ID:117

Match the toxicants of plant foods in Group I with their main plant source given in Group II.

QUESTION ID:118

Match the products in Group I with the enzymes used for their preparation given in Group II.

QUESTION ID:119

Match the food items in Group I with the type of colloidal dispersion given in Group II.

QUESTION ID:120

[a] Assertion: In the presence of sucrose, the temperature and time for gelatinization of starch increases.
[r] Reason: Sucrose, due to its hygroscopic nature, competes with starch for water needed for gelatinization.

QUESTION ID:121

Thermal death of viable spores of Bacillus subtilis in a food sample follows a first order kinetics with a specific death rate constant of 0.23 min-1 at 100°C. The time (in minutes) required to kill 99% of spores in the food sample at 100°C will be

QUESTION ID:122

How much skim milk (in kg) containing 0.1% fat should be added to 500 kg of cream containing 50% fat to produce standardized cream containing 36% fat?

QUESTION ID:123

Which of the following statements is NOT CORRECT in relation to muscle proteins ?

QUESTION ID:124

A cold storage plant is used for storing 50 tonnes of apples in perforated plastic crates. During the storage, apples are cooled down from 28°C to storage temperature of 2°C. (Specific heat of the apple = 0.874 kCal kg-1 °C-1). If the required cooling is attained in 16 hours, the refrigeration plant capacity (in Tons) is

QUESTION ID:125

An actively growing culture of Acetobacter aceti is added to the vigorously aerated fermented fruit juice medium containing 10 g l-1 ethanol to produce vinegar. After some time, the ethanol concentration in the medium is 0.8 g l-1 and acetic acid produced is 8.4 g l-1. What is the conversion efficiency of the process with respect to theoretical yield?

QUESTION ID:126

An enzyme catalyzed reaction (following Michaelis-Menten kinetics) exhibits maximum reaction velocity (Vm) of 75 nmol l-1 min-1. The enzyme at a substrate concentration of 1.0x10-4 M shows the initial reaction velocity of 60 nmol l-1 min-1. The Km value of the enzyme in molar concentration (M) is