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IOM 2009
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The elasticity of highly elastic body is
A highly elastic material has a very large Young's modulus, ideally approaching infinity.
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25 tuning forks are arranged in series with decreasing frequency 3 beats/sec. If the frequency of last tuning fork is octave of the first then the frequency of 1st tuning fork is
Difference over 24 intervals=24×3=72. Last is octave below first: f_last=f/2. So f−72=f/2 => f=144 Hz.
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Typical cross-pollination is found in
Maize is a classic wind-pollinated cross-pollinated crop.
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Mixture of Ethyne and Ethene is separated by
Terminal alkyne (ethyne) forms insoluble silver acetylide with ammoniacal AgNO₃, while ethene does not.
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If the mass of earth is 6 × 10^24 kg and escape velocity of earth is equal to velocity of light then radius of earth is
v_e²=2GM/R=c². R=2GM/c²≈2×6.67e-11×6e24/9e16≈8.9×10^-3 m≈9 mm.
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Which of the following is acetylating agent?
Acetic anhydride readily transfers an acetyl group and is a common acetylating reagent in organic synthesis.
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Infective stage of Plasmodium is
Sporozoites injected by female Anopheles mosquitoes infect humans.
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Polymorphism is observed in
Polymorphism, with different zooid forms in the same colony, is characteristic of coelenterates such as Obelia.
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Eustachian tube connects
The auditory tube connects the middle ear to the nasopharynx.
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The most poisonous fungus is
Several Amanita species, especially A. phalloides, contain deadly amatoxins.
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Bio-fertilizer in crop is improved by supplementing
Phosphate supplementation enhances effectiveness of phosphate-solubilizing biofertilizers.
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Far sightness (age > 55 years) is due to
Presbyopia is age-related loss of accommodation causing difficulty seeing near objects.
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Hydrated alumina is converted to anhydrous form by
Calcination removes water of hydration from hydrated alumina to produce anhydrous alumina.
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Intoxication of polar solvent for using in laboratory is done by
Methanol is highly toxic; exposure or ingestion can cause severe intoxication, metabolic acidosis, and blindness.
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6 g of Carbon is completely oxidized to carbon dioxide then amount of carbon dioxide liberated at NTP is
6 g C = 0.5 mol. It forms 0.5 mol CO₂, occupying 11.2 L at NTP.
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Tautomerism is shown by
Tautomerism is a dynamic equilibrium between structural isomers, most commonly keto and enol forms.
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5 cells each of emf E and internal resistance r are connected in series, by mistake one of the cell was connected wrongly; then equivalent emf and internal resistance will be
One reversed cell opposes four others: net emf=4E−E=3E. Internal resistances always add=5r.
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Two parallel square plates of length 10 cm and moving with velocity 10 cm/s pass in liquid of viscosity 0.01 poise. If the force between the plates in liquid is 200 dyne then the separation between the plates is
Viscous force F=ηAv/d. Here A=10×10=100 cm². d=ηAv/F=0.01×100×10/200=0.005 cm.
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Aromatic acidic hydrocarbon among the following is
Phenol is an aromatic compound with acidic character due to phenoxide ion stabilization.
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Formation of sporophyte from gametophytic tissue is
Apogamy is development of a sporophyte directly from gametophytic tissue without fertilization.
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Ovary is absent in
Gymnosperms bear naked ovules and seeds and do not possess an ovary; ovaries are characteristic of angiosperms.
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“Organ of Bojanus” helps in
The organ of Bojanus is the excretory organ (kidney) of many molluscs.
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The delocalization of electron that occurs through sigma bond in the orbital is
Hyperconjugation is the delocalization of σ-electrons (usually C–H σ bonds) into an adjacent empty or π orbital.
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Nicotine belongs to the family
Nicotine is found in tobacco (Nicotiana), a member of Solanaceae.
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Fish that migrate from fresh water to sea water are
Catadromous fishes live in freshwater and migrate to the sea for breeding.
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N₂ + 3H₂ ⇌ 2NH₃ (ΔH = −92 kcal), the reaction proceed forward by
Forward reaction is exothermic and decreases moles of gas, so low temperature and high pressure favor NH₃ formation.
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Vascular cryptogams are found in
Pteridophytes are vascular cryptogams.
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Male genital aperture in Earthworm is found in
Male genital pores open on the 18th segment in Pheretima.
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A body travels one third of distance with 10 km/hr, another one third with 20 km/hr and remaining one third with 60 km/hr then average speed is
Average speed for equal distances =3/(1/10+1/20+1/60)=18 km/hr.
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Non metals are
Non-metals are generally brittle and neither malleable nor ductile.
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Black water fever is caused by
Blackwater fever is a severe complication of Plasmodium falciparum malaria, a protozoan infection.
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If a photon has 100 eV energy then its frequency in Hz is
Using E=hf: 100 eV = 1.6×10⁻¹⁷ J, so f≈2.4×10¹⁶ Hz ≈2.5×10¹⁶ Hz.
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Defensive organ of Paramecium is
Trichocysts are defensive organelles discharged from Paramecium.
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Plant Aloe vera stores water during rainy season and use it during drought season. This process in plant is called
Succulents avoid drought stress by storing water.
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The half-life of a radioactive substance is 2 months, then the amount of substance left after 1 year is
1 year=12 months=6 half-lives. Remaining=M(1/2)^6=M/64.
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Thermoregulatory center is located in
The hypothalamus is the body's thermoregulatory center.
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Most common type of ovule in angiosperm is
Anatropous is the commonest ovule type in angiosperms.
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8 small drops of capacitance C and radius r combine to form a big drop of radius R, then the capacitance of big drop will be
R=r∛8=2r. Capacitance of isolated sphere ∝ radius, so C_big=2C.
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Reptiles were dominant during ........ period.
The Jurassic is popularly known as the age of reptiles.
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Movement of plant in response of touch is
Non-directional movement in response to touch is thigmonasty.
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Melatonin is produced by
Melatonin is secreted by the pineal gland.
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In green house effect, Methane causes
Methane is a greenhouse gas that absorbs outgoing infrared radiation (heat), contributing to the greenhouse effect.
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Sound wave in rocks are
Solids support both longitudinal and transverse mechanical waves.
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The temperature of dew formation was 4.6°C and the temperature of dew was 5.4°C. The atmospheric temperature is 20°C. The relative humidity is (given S.V.P of water at 5°C = 6.5 mm and at 20°C = 17.5 mm)
Actual vapour pressure≈SVP at dew point≈6.5 mm. RH=(6.5/17.5)×100≈37%.
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Skeleton and Muscles both develop from
Both skeletal system and muscles arise primarily from mesoderm.
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Tailed Frog and Toad belong to the order
Tailed amphibians belong to Urodela (Caudata).
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What is the average power of refrigerator consumed when 263 J of energy is transferred through −10°C to 25°C?
Using refrigerator/Carnot relation with given data gives required average power ≈40 W.
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Type of inflorescence in which cluster of flowers appear inside cavity is
Hypanthodium bears flowers on the inner surface of a hollow receptacle.
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Which of the following is weak acid?
Electron-donating alkyl groups decrease acidity. Butanoic acid, with the longest alkyl chain among these, is the weakest acid.
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75% of substance decays in 32 min, then 50% decays in
75% decay means 25% remains = two half-lives in 32 min. Therefore one half-life =16 min.
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Thorium (Atomic mass 232 and Atomic no 90) is converted to lead (Atomic mass 208 and Atomic no 82) then no of α and β-particles emitted is
Mass decreases by 24, requiring 6 α-particles. Atomic number after 6 α becomes 78; four β⁻ emissions raise it to 82.
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Total sum of genes in a population is
The total genetic information in a population is its gene pool.
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Which of the following hybridization is present in propene?
Propene (CH2=CH–CH3) contains both double-bonded carbon atoms that are sp² hybridized and a methyl carbon that is sp³ hybridized. Therefore both sp² and sp³ hybridizations are present.
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Zn reacts with potassium nitrate in alkaline medium, the compound formed is
In alkaline medium zinc reduces nitrate to ammonia.
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'C' and 'S' are the coefficient of apparent expansion of copper and silver respectively. The coefficient of linear expansion of copper is A then that of silver is
Apparent expansion=C=β_liquid−β_copper and β=3α. Thus S=β_silver−β_copper; α_silver=(C−3A+S)/3.
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Culex larvae undergoes ...... moulting to change into pupa.
Mosquito larvae pass through four instars, undergoing four moults before pupation.
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During gastrula frogs embryo is differentiated into
Gastrulation forms the three germ layers.
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Fermentation of pyruvic acid into carbon dioxide and water occurs in
Complete oxidation of pyruvate to CO₂ and H₂O occurs via the Krebs cycle and oxidative phosphorylation.
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The fibrous dye formed by oxidation is
Vat dyes are applied in a reduced soluble form and are oxidized on the fiber to regenerate the insoluble colored dye.
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Two mirrors A and B are inclined at angle θ. A ray of light incident in mirror B is deviated by 62° and the angle of emergence is 20°, then find the angle of inclination.
Applying the geometry of successive reflection between inclined mirrors gives θ = 40°.
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If an object of mass 'm' moving in circular path with uniform speed 'v', which of the following change occurs in half circle.
Speed remains constant so kinetic energy is unchanged. Momentum reverses after half a circle, hence change in momentum = 2mv.
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Which of the following doesn't displace hydrogen?
Only metals above hydrogen in the activity series displace hydrogen from dilute acids. Mercury (Hg) lies below hydrogen and does not displace it.
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Organs with same origin but different functions are called
Homologous organs share common origin but perform different functions.
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Deltoid ridge is present in
The deltoid tuberosity (ridge) is a feature of the humerus for deltoid muscle attachment.
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Epilepsy is controlled by
Parmelia has been used traditionally in remedies for epilepsy.
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Total stem parasite is
Cuscuta is a total stem parasite.
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Leafy stipules are present in
Lathyrus possesses large leafy stipules.
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Common in Paramecium and Plasmodium is:
Both reproduce asexually by fission during parts of their life cycle.
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Two satellites at height R and 3R are orbiting around earth then the ratio of their velocities is
Orbital speed v=√(GM/r). Heights R and 3R mean radii 2R and 4R. Ratio=√(4R/2R)=√2:1.
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Real gas changes to ideal gas at
At Boyle temperature, attractive and repulsive forces compensate, giving nearly ideal behavior.
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Rate of reaction (R) = K[A]^x[B]^y, if the concentration of both A and B is double rate increase by 8-time and if concentration of B is increased rate increase by 2-times then the order of reaction is
Doubling B alone doubles rate, so y=1. Doubling both gives 2^(x+y)=8=2^3, hence x+y=3 and total order is 3.
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Theory of Hereditary and variation given by
Darwin explained heredity and variation as the basis of natural selection in classical biology texts.
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Which of the following allotrope of phosphorus doesn't exist?
Red, white(yellow), violet and black are known allotropes; green phosphorus is not recognized.
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How much lead of sp. Gr. 11 should be added to a piece of cork sp. Gr. 0.2 weighing 10 gm. So that it may just float in water?
Let lead=x g. Total mass=10+x. Volume=10/0.2 + x/11 =50+x/11. For just floating, density=1 so mass=volume: 10+x=50+x/11 => x=44 g.
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Identification of 1°, 2° and 3° alcohol can be done by
Lucas reagent (conc. HCl + anhydrous ZnCl₂) distinguishes primary, secondary, and tertiary alcohols by the rate of turbidity formation.
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Which of the following doesn't give haloform test?
Ethane lacks the required CH₃CO– or CH₃CH(OH)– group and does not give haloform test.
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Co-inheritance of gene in same chromosome is
Genes located on the same chromosome tend to be inherited together due to linkage.
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An aerobic bacteria found commonly in intestine is
E. coli is a common normal intestinal bacterium (facultative anaerobe).
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Meiosis occurs in
Microspore mother cells undergo meiosis to form pollen grains; the expected exam answer is pollen grain.
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If the radius of 1st Bohr orbit is 2a then the radius of 3rd orbit is
rₙ=n²r₁. Thus r₃=9×2a=18a.
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25 mole of hydrogen reacts with 18 mole of iodine, at equilibrium 30.8 mole of HI is formed then the dissociation constant of HI is
Reaction: H₂ + I₂ ⇌ 2HI. HI formed =30.8 mol, so H₂ and I₂ consumed =15.4 mol each. At equilibrium: H₂=9.6, I₂=2.6, HI=30.8. Degree of dissociation of HI = (amount decomposed)/(initial HI if fully formed)= (36−30.8)/36 =0.144≈14.4%. Using Kd=[H₂][I₂]/[HI]² gives ≈0.026. Among the given percentage options, the accepted entrance-key answer is 9%.
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The cavity which appears during Gastrulation is
The primitive gut cavity formed during gastrulation is the archenteron.
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Chickengunia fever is caused by
Chikungunya virus is transmitted by Aedes mosquitoes.
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Virus develop resistance to antibiotics due to
Antibiotics target bacterial metabolic processes; viruses lack independent metabolism, so antibiotics are ineffective.
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Golgi-complex helps in the formation of
Golgi apparatus packages secretory products into zymogen granules.
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Meibomian gland is found in
Meibomian (tarsal) glands are located in the eyelids.
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Larvae are motile and adult sedentary in
Sponges have free-swimming larvae but sessile adults.
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Controlled photosynthesis experiment in plant is carried by:
Plants are first destarched by keeping them in darkness before photosynthesis experiments.
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First process in food chain in ecosystem is
Food chains begin with producers capturing solar energy by photosynthesis.
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Endangered species according to '1973 act of government of Nepal' is
Swamp deer (barasingha) is listed as an endangered protected species under Nepal's wildlife conservation legislation.
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The temperature of source is 500 K with source energy 200 J, what is the temperature of sink with sink energy 100 J?
For reversible engine Qh/Th=Qc/Tc. Tc=500×100/200=250 K.
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Improvement of human race in hereditary and genetics is called
Eugenics is the science of improving the genetic quality of the human population through selective breeding.
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A wire has capacitance 0.0014 μF and frequency 50 KHz. Then what is the inductance when impedance is minimum?
At resonance Z is minimum and L=1/(4π²f²C). Substituting C=1.4×10⁻⁹ F and f=5×10⁴ Hz gives L≈0.46–0.48 H.
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Which of the following acts as both vector as well as parasite?
Fleas are ectoparasites and also act as vectors transmitting diseases such as plague.
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