A rectangular block of mass m and area of cross-section A floats in a liquid of density ρ. If it is given a small vertical displacement from equilibrium, it undergoes oscillation with a time period T. Then:
1.
2.
3.
4.
A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased so as to increase its efficiency by 50% of original efficiency?
1. 275 K
2. 325 K
3. 250 K
4. 380 K
When a charged particle moving with velocity is subjected to a magnetic field of induction , the force on it is non-zero. This implies that:
1. angle between and is necessarily 90o.
2. angle and between can have any value other than 90o.
3. angle between and have any value other than zero and 180o.
4. angle between and is either zero or 180o.
Two cells having the same emf, are connected in series through an external resistance R. Cells have internal resistance r1 and r2 respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:
1.
2.
3.
4.
A black body at 1227 °C emits radiations with maximum intensity at a wavelength of 5000 Å. If the temperature of the body is increased by 1000 °C, the maximum intensity will be observed at:
1. 4000 Å
2. 5000 Å
3. 6000 Å
4. 3000 Å
Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of the potential difference applied across them so that the magnetic field at their centres is the same?
1. 3
2. 4
3. 6
4. 2
A transistor-oscillator using a resonant circuit with an inductance L (of negligible resistance) and a capacitance C has a frequency f. If L is doubled and C is changed to 4C, the frequency will be:
1. f/4
2. 8f
3.
4. f/2
The binding energy of deuteron is 2.2 MeV and that of is 28 MeV. If two deuterons are fused to form one then the energy released is:
1. 25.8 MeV
2. 23.6 MeV
3. 19.2 MeV
4. 30.2 MeV
In a radioactive material, the activity at time t1 is R1 and at a later time t2, it is R2. If the decay constant of the material is λ, then:
1.
2.
3.
4.
The ionization potential of the hydrogen atom is 13.6 V. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr’s theory, the spectral lines emitted by hydrogen will be:
1. two
2. three
3. four
4. one
The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is :
1. 4 U
2. 8 U
3. 16 U
4. U/4
For angles of projection of a projectile at angles (45°-θ) and (45°+θ), the horizontal ranges described by the projectile are in the ratio of:
1. 1:1
2. 2:3
3. 1:2
4. 2:1
A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation s = t2, where t is in s. Work done by the force in 2 s is :
1.
2.
3.
4.
A particle moves along a straight line OX. At a time t (in seconds) the distance x (in metres) of the particle from O is given by
x= 40 + 12t – t3
How long would the particle travel before coming to rest?
1. 24 m
2. 40 m
3. 56 m
4. 16 m
The velocity v of a particle at time t is given by , where a, b and c are constants. The dimensions of a, b, and c are respectively:
1.
2.
3.
4.
A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again?
1. 1 cm upward
2. 4.5 cm downward
3. 1 cm downward
4. 2 cm upward
300 J of work is done in sliding a 2 kg block up an inclined plane of height 10 m. Taking g = 10 m/s2, work done against friction is :
1. 200 J
2. 100 J
3. zero
4. 1000 J
A transistor is operated in common emitter configuration at constant collector voltage Vc = 1.5 V such that a change in the base current from 100 μA to 150 μA produces a change in the collector current from 5 mA to 10 mA. The current gain (β) is:
1. 67
2. 75
3. 100
4. 50
Which of the following is an example of forward biasing?
1.
2.
3.
4.
A photo-cell employs photoelectric effect to convert:
1. change in the frequency of light into a change in electric voltage.
2. change in the intensity of illumination into a change in photoelectric current.
3. change in the intensity of illumination into a change in the work function of the photocathode.
4. change in the frequency of light into a change in the electric current.
The core of a transformer is laminated because :
1. energy losses due to eddy currents may be minimized
2. the weight of the transformer may be reduced
3. rusting of the core may be prevented
4. ratio of voltage in primary and secondary may be increased
Two coils of self-inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is:
1. 10 mH
2. 6 mH
3. 4 mH
4. 16 mH
In a discharge tube ionization of enclosed gas is produced due to collisions between:
1. positive ions and neutral atoms/molecules
2. negative electrons and neutral atoms/molecules
3. photons and neutral atoms/molecules
4. neutral gas atoms/molecules
When photons of energy h fall on an aluminium plate (of work function E0), photoelectrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be :
1.
2. 2K
3. K
4. K+h
The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B, and C as shown below:
The logic circuit gate is :
1. AND gate
2. NAND gate
3. NOR gate
4. OR gate
A coil of inductive reactance 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitive reactance 25 Ω. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is:
1. 0.56
2. 0.64
3. 0.80
4. 0.33
A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of 30 ° with the wall. It is reflected with the same speed and at the same angle. If the ball is in contact with the wall for 0.25 s, the average force acting on the wall is :
1. 48 N
2. 24 N
3. 12 N
4. 96 N
The moment of inertia of a uniform circular disc of radius R and mass M about an axis touching the disc at its diameter and normal to the disc is :
1.
2.
3.
4.
The momentum of a photon of energy 1 MeV in kg m/s, will be :
1.
2.
3.
4.
The radius of Germanium (Ge) nuclide is measured to be twice the radius of . The number of nucleons in Ge are:
1. 73
2. 74
3. 75
4. 72
The molar specific heat at constant pressure of an ideal gas is (7/2)R. The ratio of specific heat at constant pressure to that at constant volume is :
1. 7/5
2. 8/7
3. 5/7
4. 9/7
The earth is assumed to be a sphere of radius R. A platform is arranges at a height R from the surface of the earth. The escape velocity of a body from this platform is fve, where ve is its escape velocity from the surface of the earth. The value of f is :
1.
2.
3.
4.
Two sound waves with wavelength 5.0 m and 5.5 m respectively, each propagate in a gas with velocity 330 m/s. We expect the following number of beats per seconds:
1. 12
2. 0
3. 1
4. 6
The power dissipated across the 8Ω resistor in the circuit shown here is 2 W. The power dissipated in watt units across the 3 Ω resistor is :
1. 2.0
2. 1.0
3. 0.5
4. 3.0
Kirchhoff’s first and second laws for electrical circuits are consequences of:
1. coservation of energy
2. conservation of electric charge and energy respectively
3. conservation of electric charge
4. conservation of energy and electric charge respectively
A transverse wave propagating along x-axis is represented by :
y(x,t) = 8.0 sin
Where x is in metres and t is in seconds. The speed of the wave is :
1.
2.
3.
4.
The time of reverberation of a room A is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double of those of room A ?
1. 2
2. 4
3.
4. 1
Which one of the following statements is true?
1. Both light and sound waves in air are transverse
2. The sound waves in air are longitudinal while the light waves are transverse
3. Both light and sound waves in air are longitudinal
4. Both light and sound waves can travel in a vacuum
Above Curie temperature :
1. a ferromagnetic substance become paramagnetic
2. a paramagnetic substance become diamagnetic
3. a diamagnetic substance become paramagnetic
4. a paramagnetic substance become ferromagnetic
A convex lens and a concave lens, each having the same focal length of 25 cm, are put in contact to form a combination of lenses. The power in dioptres of the combination is :
1. 25
2. 50
3. infinite
4. zero
An electric dipole of moment is lying along a uniform electric field . The work done in rotating the dipole by 90 ° is :
1.
2.
3. 2pE
4. pE
A parallel plate air capacitor is charged to a potential difference of V volts. After disconnecting the charging battery , the distance between the plates of the capacitor is increased using an insulating handle. As a result the potential difference between the plates:
1. decreases
2. does not change
3. becomes zero
4. increases
A car turns at a constant speed on a circular track of radius 100 m, taking 62.8 s for every circular lap. The average velocity and average speed for each circular lap respectively is :
1. 0,0
2. 0, 10 m/s
3. 10 m/s, 10 m/s
4. 10 m/s, 0
A square surface of side L m is in the plane of the paper. A uniform electric field (V/m), also in the plane of the paper, is limited only to the lower half of the square surface, (see figure). The electric flux in SI units associated with the surface is :
1.
2.
3. zero
4.
A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity ω. The force exerted by the liquid at the other end is :
1.
2.
3.
4.
A uniform rod of length l and mass m is free to rotate in a vertical plane about A. The rod initially in horizontal position is released. The initial angular acceleration of the rod is :
(Moment of inertia of rod about A is )
1.
2.
3.
4.
The vectors and
are such that a :
| +
| = |
-
|
The angle between the two vectors is :
1. 90o
2. 60o
3. 75o
4. 45o
Two bodies, A(of mass 1 kg) and B (of mass 3 kg) are dropped from heights of 16 m and 25 m, respectively. The ratio of the time taken by them to reach the ground is :
1. 5/4
2. 12/5
3. 5/12
4. 4/5
Identify the correct statement for change of Gibbs energy for a system (ΔGsystem) at constant temperature and pressure:
1. If , the process is spontaneous
2. If , the system has attained equilibrium
3. If , the system is still moving in a particular direction.
4. If , the process is not spontaneous
A solution containing 10g per dm3 of urea (molecular mass = 60g mol-1) is isotonic with a 5% solution of a non-volatile solute. The molecular mass of this non-volatile solute is :
1. 25g mol-1.
2. 300g mol-1.
3. 350g mol-1.
4. 200g mol-1.
A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to :
1. log k
2. n
3.
4. log 1/k
Assume each reaction is carried out in an open container. For which reaction will ΔH=ΔE ?
1.
2.
3.
4.
In a set of reactions propanoic acid yielded a compound D.
The structure of D would be :
1.
2.
3.
4.
During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process
Proteins PolypeptidesAmino acids, are respectively:
1. amylase and maltase
2. diastase and lipase
3. pepsin and trypsin
4. invertase and zymase
The human body does not produce :
1. DNA
2. vitamins
3. hormones
4. enzymes
CsBr crystallises in a body centred cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avogadro number being 6.02×1023 mol-1, the density of CsBr is :
1. 42.5
2. 0.425
3. 8.25
4. 4.25
More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is :
1. more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
2. lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
3. greater metallic character of the lanthanoids than that of the corresponding actinoids
4. more active nature of the actinoids
Given : The mass of electron is 9.11×10-31 kg plank constant is 6.626 ×10-34 Js, the uncertainty involved in the measurement of velocity within a distance of 0.1Å is :
1.
2.
3.
4.
Copper sulphate dissolves in excess of KCN to give :
1. CuCN
2.
3.
4.
In which of the following pairs are both the ions coloured in aqueous solution?
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co= 27)
1.
2.
3.
4.
Al2O3 can be converted to anhydrous AlCl3 by heating :
1.
2. with NaCl in solid state
3. a mixture of and carbon in dry gas
4. with gas
The enthalpy and entropy change for the reaction:
Br2 (l) + Cl2 (g) →2BrCl(g)
Are 30kJ mol-1 and 105 JK-1 mol-1 respectivel. The temperature at which the reaction will be in equilibrium is:
(At No. Ti = 22, V = 23, Cr = 24, Mn = 25)
1. 285.7 K
2. 273 K
3. 450 K
4. 300 K
The appearance of colour in solid alkali metal halides is generally due to :
1. F-centres
2. Schottky defect
3. Frenkel defect
4. Interstitial positions
The general molecular formula, which represents the homologous serious of alkanols is :
1.
2.
3.
4.
If = -0.441 V and
= 0.771 V, the standard emf of the reaction :
Fe + 2Fe3+→ 3Fe2+ will be :
1. 0.330 V
2. 1.653 V
3. 1.212 V
4. 0.111 V
For the reaction
2A + B → 3C + D
Which of the following does not express the reaction rate?
1.
2.
3.
4.
For the reaction,
CH4(g) + 2O2(g) CO2(g) + 2H2O(l)
ΔrH = -170.8 kJ mol-1
Which of the following statements is not true?
1. At equilibrium, the concentrations of and water (l) are not equal.
2. The equilibrium constant for the reaction is given by
3. Addition of at equilibrium will cause a shift to the right
4. The reaction is exothermic
[NH(CH2)6NHCO(CH2)4CO]n is a :
1. co-polymer
2. addition polymer
3. thermo-setting polymer
4. homopolymer
A carbonyl compound reacts with hydrogen cyanide to form cyanohydrins which on hydrolysis forms a racemic mixture of α-hydroxy acid. The carbonyl compound is :
1. acetaldehyde
2. acetone
3. diethyl ketone
4. formaldehyde
Which one of the following is a peptide hormone?
1. Glucagon
2. Testosterone
3. Thyroxin
4. Adernaline
The major organic product in the reaction,
CH3 — O — CH(CH3)2 + HI →Product is :
1.
2.
3.
4.
Nucleophilic addition reaction will be most favoured in :
1.
2.
3.
4.
The enthalpy of combustion of H2, cyclohexene (C6H10) and cyclohexene (C6H12) are -241, -3800 and -3920 kJ per mol respectively. Heat of hydrogenation of cyclohexene is :
1. -121 kJ per mol
2. +121 kJ per mol
3. +242 kJ per mol
4. -242 kJ per mol
Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields :
1. ethyl butyrate
2. acetoacetic ester
3. methyl acetoacetate
4. ethyl propionate
Consider the reaction
N2(g) + 3H2(g) → 2NH3(g)
The equality relationship between and
is :
1.
2.
3.
4.
Which of the following is not chiral?
1. 2-butanol
2. 2,3-dibromopentane
3. 3-bromopentane
4. 2-hydroxypropanoic acid
[Co(NH3)4(NO2)2]Cl exhibits :
1. linkage isomerism, ionization isomerism and optical isomerism
2. linkage isomerism, ionization isomerism and geometrical isomerism
3. ionization isomerism,geometrical isomerism and optical isomerism
4. linkage isomerism, geometrical isomerism and optical isomerism
[Cr(H2O)6]Cl3 (at. No. of Cr = 24) has a magnetic moment of 3.83 BM, the correct distribution of 3delectrons in the chromium of the complex is :
1.
2.
3.
4.
1.00 g of non-electrolyte solute (molar mass 250 mol-1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, Kf of benzene is 5.12 mol-1, the freezing point of benzene will be lowered by :
1. 0.4 K
2. 0.3 K
3. 0.5 K
4. 0.2 K
Which of the following pairs constitutes a buffer?
1.
2.
3.
4.
The hydrogen ion concentration of a 10-8 M HCl aqueous solution at 298 K (Kw = 10-14) is :
1.
2.
3.
4.
A solution of acetone in ethanol :
1. shows a negative deviation from Raoult's law
2. shows a positive deviation from Raoult's law
3. behaves like a near ideal solution
4. obeys Raoult's law
A hypothetical electrochemical cell is shown below A-|A+ (xM) || B+ (yM)| B+
The emf measured is +0.20V. The cell reaction is :
1.
2.
3. the cell reaction cannot be predicted
4.
Ethylene oxide when treated with Grignard reagent yields :
1. secondary alcohol
2. tertiary alcohol
3. cyclopropyl alcohol
4. primary alcohol
During osmosis, flow of water through a semi-permeable membrane is :
1. from solution having higher concentration only
2. from both sides of semi-permeable membrane with equal flow rates
3. from both sides of semi-permeable membrane with unequal flow rates
4. from solution having lower concentration only
Which of the following is more basic than aniline?
1. Diphenylamine
2. Triphenylamine
3. p-nitroaniline
4. Benzylamine
In which of the following molecules are all the bonds not equal?
1.
2.
3.
4.
The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH3 (1.5 D) is larger than that of NF3 (0.2 D). This is because :
1. in NH3 as well as in NF3 the atomic dipole and bond dipole are in the same direction
2. in NH3 the atomic dipole and bond dipole are in the same direction whereas in NF3 these are in opposite directions
3. in NH3 as well as in NF3 the atomic dipole and bond dipole are in opposite directions
4. in NH3 the atomic dipole and bond dipole is in the opposite directions whereas in NF3 these are in the same directions
The correct order of the mobility of the alkali metal ions in aqueous solution is :
1.
2.
3.
4.
The correct order regarding the electronegativity of hybrid orbitals of carbon is:
1.
2.
3.
4.
Which of the following species has a linear shape?
1.
2.
3.
4.
Which of the following is the most basic oxide?
1.
2.
3.
4.
The orientation of an atomic orbital is governed by :
1. azimuthal quantum number
2. spin quantum number
3. magnetic quantum number
4. principal quantum number
Which of the following is not a correct statement?
1. The electron deficient molecules can act as Lewis acids.
2. The canonical structures have no real existance.
3. Every AB5 molecule does in fact have square pyramidal structure.
4. Multiple bonds are always shorter than corresponding single bonds.
The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is :
1. 2
2. 3
3. 4
4. 1
Which one of the following orders is not in accordance with the property stated against?
1.
2.
3.
4.
Which of the following is not isostructural with SiCl4?
1.
2.
3.
4.
The IUPAC name of is :
1. 3, 4-dimethylpentanpyl chloride
2. 1-chloro-1-oxo-2,2-dimethylpentane
3. 2-ethyl-3-methylbutanoyl chloride
4. 2, 3-dimethylpentanoyl chloride
What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in its synergids ?
1. 16
2. 24
3. 32
4. 8
Pineapple (annanas) fruit develops from:
1. a unilocular polycarpillary flower
2. a multipistillate syncarpous flower
3. a cluster of compactly borne flowers on a common axis
4. a multilocular monocarpillary flower
Golden rice is a promising transgenic crop. When released for cultivation, it will help in:
1. alleviation of vitamin-A deficiency
2. pest resistance
3. herbicide tolerance
4. producing a petrol-like fuel from rice
Parthenocarpic tomato fruits can be produced by:
1. removing androecium of flowers before pollen grains are released
2. treating the plants with low concentrations of gibberellic acid and auxins
3. raising the plants from vernalised seeds
4. treating the plants with phenylmercuric acetate
How does pruning help in making the hedge dense?
1. It includes the differentiation of new shoots from the rootstock
2. It frees axillary buds from apical dominance
3. The apical shoot grows faster after pruning
4. It releases wound hormones
The 'blue baby' syndrome results from:
1. excess of chloride
2. methaemoglobin
3. excess of dissolved oxygen
4. excess of TDS (Total Dissolved Solids)
Praying mentis is a good example of:
1. mullerian mimicry
2. warning colouration
3. social insects
4. camouflage
Which one of the following statements is correct?
1. Neurons regulate endocrine activity, but not vice versa
2. Endocrine glands regulate neural activity and nervous system regulates endocrine glands
3. Neither hormones control neural activity not the neurons control endocrine activity
4. Endocrine glands regulate neural activity, but not vice versa
Examination of blood of a person suspected of having anaemia, shows large, immature, nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following, is likely to alleviate his symptoms?
1. Thiamine
2. Folic acid and cobalamine
3. Riboflavin
4. Iron compounds
Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cau.se decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?
1. Frequent irrigation of the crop
2. Treatment of the paints with cytokinins alongwith a small dose of nitrogenous fertilizer
3. Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5-trichlorophenoxy acetic acid
4. Application of iron and magnesium to promote synthesis of chlorophyll
In which of the following fruits is the edible part the aril?
1. Custard apple
2. Pomegranate
3. Orange
4. Litchi
Which one of the following amino acids was not found to be synthesized in Miller’s experiment?
1. Glycine
2. Aspartic acid
3. Glutamic acid
4. Alanine
Crop plants grown in monoculture are
1. low in yield
2. free from intraspecific competition
3. characterized by poor root system
4. highly prone to pests
Montreal protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year:
1. 1986
2. 1987
3. 1988
3. 1985
The formula for exponential population growth is :
1. dt/dN= rN
2. dN/rN= dt
3. rN/dN= dt
4. dN/dt= rN
Which one of the following is not used for construction of ecological pyramids ?
1. Dry weight
2. Number of individuals
3. Rate of energy
4. Fresh weight
Niche overlap indicates
1. active co-peration between two species
2. two different parasites on the same host
3. sharing of one or more resources between the two species
4. mutualism between two species
In photosystem-I, the first electron acceptor is:
1. ferredoxin
2. cytochrome
3. plastocyanin
4. an iron-sulphur protein
Treatment of seed at low temperature under moist conditions to break its dormancy is called :
1. sacrification
2. vernalization
3. chelation
4. stratification
Which one of the following is the most suitable, medium for culture of Drosophila melanogaster?
1. Moist bread
2. Agar agar
3. Ripe banana
4. Cow dung
Which one of the following is not included under in situ conservation?
1. Sanctuary
2. Botanical garden
3. Biosphere reserve
4. National park
Which antibiotic inhibits the interaction between t-RNA and m-RNA using bacterial protein synthesis?
1. Erythromycin
2. Neomycin
3. Streptomycin
4. Tetracycline
Phenotype of an organism is the result of:
1. mutuations and linkages
2. cytoplasmic rffects and nutrition
3. environmental changes and sexual dimorpgism
4. genotype and environment interactions
Photochemical smog pollution does not contain:
1. ozone
2. nitrogen dioxide
3. carbon dioxide
4. PAN (Peroxy Acyl Nitrate)
Moss peat is used as a packing material for sending flowers and live plants to distant places because:
1. it is easily available
2. it is hygroscopic
3. it reduces transpiration
4. it serves as a disinfectant
A common structural feature of vessel elements and sieve tube elements is :
1. thick secondary walls
2. pores on lateral walls
3. presence of P-protein
4. enucleate condition
The thalloid body of a slime mould (Myxomycetes) is known as :
1. protonema
2. Plasmodium
3. fruiting body
4. mycelium
In which mode of inheritance do you expect more maternal influence among the offspring?
1. Autosomal
2. Cytoplasmic
3. Y-linked
4. X-linked
What type of placentation is seen in sweet pea ?
1. Basal
2. Axile
3. Free-central
4. Marginal
Long filamentous threads protruding at the end of a young cob of maize are:
1. anthers
2. styles
3. ovaries
4. hairs
Conifers differ from grasses in the:
1. production of seeds from ovules
2. lack of xylem tracheids
3. absence of pollen tubes
4. formation of endosperm before fertilization
How many different kinds of gametes will be produced by a plant having the genotype AABbCC?
1. Three
2. Four
3. Nine
4. Two
In maize, hybrid vigour is exploited by :
1. bombarding the protoplast with DNA
2. crossing of two inbreed parental lines
3. harvesting seeds from the most productive plants
4. inducing mutations
Which of the following statements regarding mitochondrial membrane is not correct ?
1. The outer membrane is permeable to all kinds of molecules
2. The enzymes of the electron transfer chain are embedded in the outer membrane
3. The inner membrane is highly convoluted forming a series of infoldings
4. The outer membrane resembles a sieve
Amino acid sequence, in protein synthesis is decided by the sequence of:
1. t-RNA
2. m-RNA
3. c-DNA
4. r-RNA
How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to CO2 and H2O yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal?
1. Two
2. Thirty
3. One
4. Fifty seven
An organic substance bound to an enzyme and essential for its activity is called:
1. coenzyme
2. holoenzyme
3. apoenzyme
4. isoemzyme
Bowman’s glands are found in:
1. olfactory epithelium
2. external auditory canal
3. cortical nephrons only
4. juxtamedullary nephrons
The bacterium (Clostridium botulinum) that causes botulism is:
1. a facultative anaerobe
2. an obligate anaerobe
3. a facultative aerobic
4. an obligate aerobic
Which one of the following is the correctly matched pair of an endangered animal and a National Park?
1. Lion- Corbett National Park
2. Rhinoceros- Kaziranga National Park
3. Wild ass- Dudhwa National Park
4. Great Indian bustard- Keoladeo National Park
A person showing upredictable moods, outbursts of emotion, quarrelsome behaviour and conflicts with others is suffering from :
1. schizophrenia
2. borderline personality disorder (BPD)
3. mood disorders
4. addictive disorders
Sulphur is an important nutrient for optimum growth and productivity in :
1. pulse crops
2. cereals
3. fibre crops
4. oilseed crops
Pentamerous, actinomorphic flowers, bicarpillary ovary with oblique septa, and fruit a capsule or berry, are characteristic features of:
1. Asteraceae
2. Brassicaceae
3. Solanaceae
4. Liliaceae
In a moss the sporophyte:
1. is partially parasitic on the gametophyte
2. produces gametes that give rise to the gametophyte
3. arises from a spore produced from the gametophyte
4. manufactures food for itself, as well as for the gametophyte
Curing of tea leaves is brought by the activity of:
1. bacteria
2. mycorrhiza
3. viruses
4. fungi
People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 meters have around 8 million. This is because at high altitude
1. people get pollution-free air to breathe and more oxygen is available
2. atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive
3. there is more UV radiation which enhances RBC production
4. people eat more nutritive food, therefore more RBCs are formes
An important evidence in favour of organic evolution is the occurrence of:
1. homologous and vestigial organs
2. analogous and vestigial organs
3. homologous organ only
4. homologous organs only
Which one of the following is not a living fossil?
1. King crab
2. Sphenodon
3. Archaeopteryx
4. Peripatus
Annual migration does not occur in the case of:
1. Salmons
2. Siberian crane
3. Salamander
4. Artic team
A major breakthrough in the studies of cells came with the development of electron microscope. This is because:
1. the resolution power of the electron microscope is much higher than that of the light microscope
2. the resolving power of the electron microscope is 200-350 nm compared to 0.1-0.2 nm for the light microsope
3. electron beam can pass through thick materials, whereas light microscopy requires thin sections
4. the electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons
Which one of the following is a matching set of a phylum and its three examples?
1. Cnidaria- Bonellia, Physalia, Aurelia
2. Platyhekminthes- Planaria, Schistosoma, Enterobius
3. Mollusca- Loligo, Teredo, Octopus
4. Prifera- Spingilla, Euplectella, pennatula
Metameric segmentation is the characteristic of :
1. Platyhelminthes and Arthropoda
2. Echinodermata and Annelisa
3. Annelida and Anthropoda
4. Mollusca and Chordata
Which of the following pairs of an animal and a plant represents endangered organisms in India ?
1. Bentinckia nicobarica and red panda
2. Tamarind and rhesus monkey
3. Cinchona and leopard
4. Banyan and black buck
Jurassic period of the Mesozoic era is characterised by:
1. gymnosperms, adminant plants and first birds appear
2. radiation of reptiles and origin of mammal like reptiles
3. Dinosaurs become extinct and angiosperms appear
4. flowering plants and first dinosaurs apper
What is common about Trypanosoma, Noctiluca, Monocystis and Giardia?
1. These are all unicellular protists
2. They have flagella
3. They produce spores
4. These are all parasites
Which of the following statements regarding cilia is not correct?
1. The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane
2. Cilia are hair-like cellular appendages
3. Microtubules of cilia are composed of tubulin
4. Cilia contain an outer ring of nine doublet microtubules surrounding two single microtubuoles
Microbes found to be very useful in genetic engineering are:
1. Escherichia coli and Agrobacterium tumefaciens
2. Vibrio cholerae and a tailed bacteriophage
3. Diplococcus sp. and Pseudomonas sp.
4. Crown gall bacterium and caenorhabditis elegans
Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread ?
A) The temperature of about 25 °C
B) The temperature of about 5 °C
C) Relative humidity of about 5%
D) Relative humidity of about 95%
E) A shady place
F) A brightly illuminated place
Choose the answer from the following options:
1. A, C and E only
2. A, D and E only
3. B, D and E only
4. B, C and F only
Evolutionary history of an organism is known as:
1. Phylogeny
2. Ancestry
3. Palaeontology
4. Ontogeny
Which of the following is considered a hot-spot of biodiversity in India?
1. Western ghats
2. Indo-Gangetic plain
3. Eastern ghats
4. Aravalli hills
During photorespiration, the oxygen consuming reaction(s) occur in:
1. stroma of chloroplasts and mitochondria
2. storma of chloroplasts and peroxisomes
3. grana of chloroplasts and peroxisomes
4. stroma of chloroplasts
Which one of the following is an example of polygenic inheritance?
1. Flower colour in Mirabilis jalapa
2. Production of male honey bee
3. Pod shape in garden pea
4. Skin colour in humans
Which one of the following not act as a neurotransmitter ?
1. Acetylcholine
2. Epinephrine
3. Nor epinephrine
4. Cortisone
Sertoli cells are regulated by the pituitary hormone known as :
1. FSH
2. GH
3. Prolactin
4. LH
A steroid hormone which regulates glucose metabolism is :
1. cortisol
2. corticosterone
3. 11-deoxycorticosterone
4. cortisone
The contractile protein of skeletal muscle involving ATPase activity is :
1. tropomyosin
2. myosin
3. a-actinin
4. toponin
Which one of the following is not a second messenger in hormone action ?
1. cGMP
2. Calcium
3. Sodium
4. cAMP
In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy ?
1. Only round seeds with green cotyledons
2. Only wrinkled seeds with yellow cotyledons
3. Only wrinkled seeds with green cotyledons
4. Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons
One gene – one enzyme hypothesis was postulated by:
1. R. Franklin
2. Hershey and Chase
3. A. Garrod
4. Beadle and Tatum
One turn of the helix in a B-form DNA is approximately:
1. 20 nm
2. 0.34 nm
3. 3.4 nm
4. 2 nm
Test cross involves:
1. crossing between two genotypes with recessive trait
2. crossing between two F1 hybrids
3. crossing the F1 hybrid with a double recessive genotype
4. crossing between two genotypes with the trait
Antiparallel strands of a DNA molecule means that:
1. one strand turns anti-clockwise
2. the phosphate groups of two DNA strands, at their ends, share the same position
3. the phosphate groups at the start of two DNA strands are in opposite position(pole)
4. one strand turns clockwise
Areolar connective tissue joins :
1. fat body with muscles
2. integument with muscles
3. bones with muscles
4. bones with bones
Mast cells secrete:
1. hippurin
2. myoglobin
3. histamine
4. haemoglobin
If a colourblind woman marries a normal visioned man, their sons will be :
1. all normal visioned
2. one-half colourblind and one-half normal
3. three-fourths colourbling and one-fourth normal
4. all colourblind
Cri-du-chat syndrome in humans is caused by the :
1. fertilization of an XX egg by a normal y-bearing sperm
2. loss of half of the short arm of chromosome 5
3. loss of half of the long arm of chromosome 5
4. trisomy of 21st chromosome
Restriction endonuclease:
1. cuts the DNA molecule randomly
2. cuts the DNA molecule at specific sites
3. restricts the synthesis of DNA inside the nucleus
4. synthesis DNA
Antibodies in our body are complex:
1. lipoproteins
2. steroids
3. prostaglandins
4. glycoproteins
Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal wastewater into natural surface water is
1. <3.0 ppm
2. < 10 ppm
3. < 100 ppm
4. < 30 ppm
Earthworms are:
1. ureotelic when plenty of water is available
2. uricotelic when plenty of water is available
3. uricotelic under conditions of water scarcity
4. ammonotelic when plenty of water is available
Which of the following is an accumulation and release centre of neurohormones?
1. Posterior pituitary lobe
2. Intermediate lobe of the pituitary
3. Hypothalamus
4. Anterior pituitary lobe
Withdrawal of which of the following hormones is the immediate cause of menstruation ?
1. Estrogen
2. FSH
3. FSH-RH
4. Progesterone
Which one of the following statements is incorrect?
1. The residual air in lungs slightly decreases the efficiency of respiration in mammals
2. The presence of non-respiratory air sacs, increases the efficiency of respiration in birds
3. In mammals, circulating body fluids serve to distribute oxygen to tissues
4. The principle of countercurrent flow facilitates efficient respiration in gills of fishes
Which one of the following has an open circulatory system?
1. Pheretima
2. Periplaneta
3. Hirudinaria
4. Octopus
Which hormone causes dilation of blood vessels, increased oxygen consumption and gluco- genesis?
1. ACTH
2. Insulin
3. Adrenalin
4. Glucagon
The causative agent of mad-cow disease is a:
1. bacterium
2. prion
3. worm
4. virus
The translocation of organic solutes in sieve tube members is supported by:
1. root pressure and transpiration pull
2. P-proteins
3. mass flow involving a carrier and ATP
4. cytoplasmic streaming
Biradial symmetry and lack of cnidoblasts are the characteristics of:
1. Starfish and sea anemone
2. Ctenoplana and Beroe
3. Aurelia and Paramecium
4. Hydra and starfish
The arrangement of the nuclei in a normal embryo sac in the dicot plants is:
1. 2+4+2
2. 3+2+3
3. 2+3+3
4. 3+3+2
An enzyme that can stimulate germination of barley seeds is:
1. a-amylase
2. lipase
3. protease
4. invertase
In a cereal grain the single cotyledon of embryo is represented by :
1. coleorhiza
2. scutellum
3. prophyll
4. coleoptiles
The majority of carbon dioxide produced by our body cells is transported to the lungs :
1. dissolved in the blood
2. as bircarbonates
3. as carbonates
4. attached to haemoglobin
Triticale, the first man-made cereal crop, has been obtained by crossing wheat with:
1. rye
2. pearl millet
3. sugarcane
4. barley
In order to obtain virus-free plants through tissue culture the best method is :
1. protoplast culture
2. embryo rescue
3. anther culture
4. meristem culture
HIV that causes AIDS, first starts destroying:
1. B-lymphocytes
2. leucocytes
3. thrmobocytes
4. helper T-lymphocytes
In which one of the following sets of animals do all the four give birth to young ones?
1. Lion, bat, whale, ostrich
2. Platypus, penguin, bat, hippopotamus
3. Shrew, bat, cat, kiwi
4. Kangaroo, hedgehog, dolphin, loris
Sicks cell anaemia has not been eliminated from the African population because:
1. It is controlled by recessive genes
2. It is not a fatal disease
3. It provides immunity against malaria
4. It is controlled by dominant genes
Two common characters found in centipede, cockroach and crab are:
1. compound eyes and anal cerci
2. joined legs and chitinous exoskeleton
3. green pland snd tracheae
4. book lungs and antennae
Both sickle cell anaemia and Huntington’s chorea are:
1. bacteria-related diseases.
2. congenital disorders
3. pollutant-induced disorders
4. virus-related diseases
Angiotensinogen is a protein produced and secreted by:
1. macula densa cells
2. endothelial cells (cells lining the blood vessels)
3. liver cells
4. juxtaglomerular (JG) cells