Recent questions tagged 2005

Which group of three of the following five statements (a-e) contain is all the three correct statements regarding beri-beri - (a) A crippling disease prevalent among the native population of sub-Saharan Africa (b) A deficiency disease caused by lack of thiamine (vitamin $B_1$) (c) A nutritional disorder in infants and young children when the diet is persistently deficient in essential protein (d) Occurs in those countries where the staple diet is polished rice (e) The symptoms are pain from neuritis, paralysis, muscle wasting, progressive oedema, mental deterioration and finally heart failure

asked Jul 24, 2018 by pady_1

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Top-shaped multiciliate male gametes, and the mature seed which bears only one embryo with two cotyledons, are characteristic features of -

asked Jul 24, 2018 by pady_1

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Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by -

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The name of Norman Borlaug is associated with-

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Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution -

asked Jul 24, 2018 by pady_1

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Auxospores and hormocysts are formed respectively, by -

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Identify the correctly matched pair -

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Which of the following characters is not typical of the class Mammalia -

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Which of the following is not used for disinfection of drinking water -

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Grey crescent is the area -

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Secretin and cholecystokinin are digestive hormones. They are secreted in -

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Bacillus thuringiensis (Bt) strains have been used for designing novel -

asked Jul 24, 2018 by pady_1

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As compared to a $C_3$-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by $C_4$-plants -

asked Jul 24, 2018 by pady_1

1 answer

A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as get the best possible resolution -

asked Jul 24, 2018 by pady_1

2 answers

Which one of the following makes use of RNA as a template to synthesize DNA -

asked Jul 24, 2018 by pady_1

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Four healthy people in their twenties got involved in injuries resulting in damage and death of a few cell of the following. Which of the cells are least likely to be replaced by new cell

asked Jul 24, 2018 by pady_1

1 answer

An acromian process is characteristically found in the -

asked Jul 24, 2018 by pady_1

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Through which cell of the embryo sac, does the pollen tube enter the embryo sac-

asked Jul 24, 2018 by pady_1

1 answer

The deficiencies of micronutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport -

asked Jul 24, 2018 by pady_1

1 answer

E. coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because -

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Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these -

asked Jul 24, 2018 by pady_1

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Which of the following is the simplest amino acid -

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1 answer

The correct order of acid strength is -

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$H_2 S$ gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because-

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1 answer

Which of the following is the electron deficient molecule -

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4.5g of aluminium (at. mass 27 amu) is deposited at cathode from $Al^{3+}$ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from $H^+$ions in solution by the same quantity of electric charge will be -

asked Jul 24, 2018 by pady_1

1 answer

A nuclide of an alkaline earth metal undergoes radioactive decay by emission of the $\alpha$-particles is succession. The group of the periodic table to which the resulting daughter element would belong is :-

asked Jul 24, 2018 by pady_1

1 answer

In a set of reactions acetic acid yielded a product D

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The major organic product formed from the following reaction

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The cell membranes are mainly composed of :-

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What is the correct relationship between the pHs of isomolar solutions of sodium oxide ($pH_1$ ), sodium sulphide ($pH_2$ ), sodium selenide ($pH_3$ ) and sodium telluride ($pH_4$) ?

asked Jul 24, 2018 by pady_1

1 answer

For a first order reaction $A\to B$ the reaction rate at reactant concentration of 0.01M is found to be$2.0 \times 10^{-5} mole L^{-1} S^{-1}$. The half life period of the reaction is :-

asked Jul 24, 2018 by pady_1

1 answer

The monomer of the polymer

asked Jul 24, 2018 by pady_1

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The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is :-

asked Jul 24, 2018 by pady_1

1 answer

A solution has a 1 :4 mole ratio of pentane to hexane. The vapour pressures of the pure hydrocarbons at $20^{\circ}$C are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in the vapour phase would be-

asked Jul 24, 2018 by pady_1

1 answer

Which one of the following is expected to exhibit optical isomerism ? (en = ethylenediamine)

asked Jul 24, 2018 by pady_1

1 answer

Four successive members of the first row transition elements are listed below with their atomic numbers. which one of them is expected to have the highest third ionization enthalpy :-

asked Jul 24, 2018 by pady_1

2 answers

Which of the following undergoes nucleophilic substitution exclusively by$ SN^1$mechanism :

asked Jul 24, 2018 by pady_1

1 answer

The number of moles of $KMnO_4$ reduced by one mole of KI in alkaline medium is :-

asked Jul 24, 2018 by pady_1

1 answer

The mass of carbon anode consumed (giving only carbondioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is :- (Atomic mass : Al = 27)

asked Jul 24, 2018 by pady_1

1 answer

The vapour pressure of two liquids 'P' and 'Q' are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mole of Q would be :-

asked Jul 24, 2018 by pady_1

1 answer

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species :-

asked Jul 24, 2018 by pady_1

1 answer

The chirality of the compound

asked Jul 24, 2018 by pady_1

1 answer

The mole fraction of the solute in one molal aqueous solution is :-

asked Jul 24, 2018 by pady_1

1 answer

Equilibrium constants $K_1$ and $K_2$ for the following equilibria : $NO(g)+\frac{1}{2}O_2 {\stackrel{k_1}{\rightleftharpoons}} NO_2(g)$ and $2NO_2 (g) {\stackrel{k_2}{\rightleftharpoons}} 2NO (g) + O_2 (g) $ are related as -

asked Jul 24, 2018 by pady_1

1 answer

A ball is thrown vertically up ward. It has a speed of 10m/sec when it has reached one half of its maximum height. How high does the ball rise? Take g = $10=m/s^2-$

asked Jul 24, 2018 by pady_1

2 answers

Two bodies have their moments of inertia I and 2I respectively about their axis of rotation. If their kinetic energies of rotation are equal, their angular momentum will be in the ratio -

asked Jul 24, 2018 by pady_1

1 answer

Two boys are standing at the ends A and B of a ground where AB = a. The boy at B starts. running in a direction perpendicular to AB with velocity v1. The boy at A starts running simultaneously with velocity v and catches the other boy in a time t, where t is -

asked Jul 24, 2018 by pady_1

1 answer

The displacement x of a particle varies with time$x=ae^{-\alpha t}+be^{\beta t}$, where $a,b,\alpha$ and $\beta$ are positive constants. The velocity of the particle will -

asked Jul 24, 2018 by pady_1

2 answers

If a vector $2\hat{i} + 3\hat{j}+8\hat{k}$ is perpendicular to the vector 4j- 4i + ak , then the value of ?

asked Jul 24, 2018 by pady_1

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