BHU PMT Question Papers 2015 - All students can download here Physics, Chemistry, Biology full syllabus Sample Question papers for admission to MBBS & BDS programme for academic session 2015-16.
A monochromatic source of light is placed at a large distance 'd' from a metal surface. Photo electrons are ejected at rate n, the kinetic energy being E. If the source is brought nearer to distance d/2, the rate and kinetic energy per photoelectron become nearly
(1) 2n and 2E
(2) 4n and 4E
(3) 4n and E
(4) n and 4E
The mean lives of a radioactive substance are 1620 year and 405 year for α-emission and β- emission respectively. Find the time during which three-fourth of a sample will decay if it is decaying both by α- mission and β-emission simultaneously
(1) 249 years
(2) 449 years
(3) 133 years
(4) 99 years
Velocity of sound in air is 320 m/s. A pipe closed at one end has a length of 1 m. Neglecting end correction, the air column in the pipe can resonate for sound of frequency
(a) 80 Hz (b) 240 Hz (c) 320 Hz (d) 400 Hz
(1) a, b, c
(2) a, b, d
(3) a, c, d
(4) b, c, d
An earthquake generates both transverse (S) and longitudianl (P) sound waves in the earth. The speed of S waves is about 4.5 km/s and that of P waves is about 8.0 km/s. A seismograph records P and S waves from an earthquake. The first P wave arrives 4.0 min before the first S wave. The epicenter of the earthquake is located at a distance about
(1) 25 km
(2) 250 km
(3) 2500 km
(4) 5000 km
When formaldehyde is treated with 50% NaOH solution, it undergoes ?
(1) cannizzaro reaction
(2) wurtz reaction
(3) aldol condensation
(4) hydrolysis
25 mL of a solution of barium hydroxide on titration with 0.1 M solution of HCl gave a titre value of 35 mL. The molarity of Ba(OH)2is
(1) 0.28
(2) 0.35
(3) 0.07
(4) 0.14
A hydrocarbon C6H12, on ozonolysis gives only one product which does not give silver mirror with tollen's reagent. The hydrocarbon is
(1) 2,3-Dimethyl-2-butene
(2) 2-Hexene
(3) 2-Methyl-2-Pentene
(4) 3-Hexene
Which is/are correct in case of heterogeneous catalyst ?
(a) The catalyst decreases the energy of activation
(b) The surface of catalyst plays an important role
(c) The catalyst actually forms a compound with reactants
(d) There is no change in the energy of activation
(1) a, b, c (2) a, b, d
(3) a, c, d (4) All of these
The angular shape of SO2 molecule consists of :
(1) 2 sigma and 2 pi bonds
(2) 1 sigma and 1 pi bonds
(3) 2 sigma and 1 pi bonds
(4) 1 sigma and 2 pi bonds
Read the following statement regarding secondary growth in plant stem carefully and select the true statements
(A) Cork cambium is responsible for secondary growth in extra stelar region
(B) Cork cambium is more active during autumn
(C) Vascular cambium is secondary in origin
(D) Vascular cambium is responsible for interstellar secondary growth
(1) only A, B & C
(2) A & B both
(3) A, B & D
(4) A, B, C & D
In Angiosperms each pollen grains produces two sperms. What do these sperms do in the fertilization of a flower ?
(1) Each one fertilizes a separate egg cell to give rise to two seeds
(2) One fertilizes an egg cell and the other fertilizes another cell that gives rise to the tissue of the fruit
(3) Both fertilizes a single egg cell
(4) One fertilizes an egg cell and the other fertilizes the cell that forms food reserve tissue
Which one of the following describes correctly the homologous structures ?
(1) Organs that have no function now, but had an important function in ancestors
(2) Organs appearing only in embryonic stage and disappearing later in the adult
(3) Organs with anatomical similarities, but performing different functions
(4) Organs with anatomical dissimilarities, but performing same function
Which of the following plant category would not show the photosynthetic carbondioxide fertilization effect after 20 years, with most favorable conditions of photosyntheis
(1) C3 Plants
(2) CAM plants
(3) C4 plants
(4) Both C3 and CAM
The transfer of energy through a terrestrial ecosystem is often depicted by energy pyramids. Which one of the following statement is true ?
(1) Ecological efficiency is highest for top consumers
(2) About 10% of the energy from one trophic level is incorporated into the biomass of the next level
(3) The energy lost as the heat in cellular respiration is 10% of the available energy of each trophic level
(4) Only 25% of energy in one trophic level is passed on to the next level.
Find out the correct sequence in embryonic development of animal :
(1) cleavage, zygote, fertilization, morula, blastula, gastrula
(2) fertilization, zygote, cleavage, morula, blastula, gastrula
(3) fertilization, cleavage, morula, zygote, blastula, gastrula
(4) fertilization, zygote, blastula, morula, cleavage, gastrula
(A) All living organisms present, past or future are linked to one another by sharing of common genetic material, but to varying degree
(B) Reproduction can be an all inclusive property of living organism
(C) Worker honey bees do not reproduce at all
(D) Interaction at lower level constituents results in emergant properties at higher level
(1) A, B, C & D are true
(2) A, C & D are true
(3) B, C & D are true
(4) A, B & C are true
The temperature of a black body is increased by 50%, then the percentage of increase of radiation is approximately
(1) 100%
(2) 25%
(3) 400%
(4) 500%
A body cools from 60ºC to 50ºC in 10 min. If room temperature is 25ºC, then temperature of body at the end of next 10 min will be
(1) 38.5ºC
(2) 40ºC
(3) 45ºC
(4) 42.85ºC
Two tuning forks when sounded together produced 4 beats/sec. The frequency of one fork is 256. The number of beats heard increases when the fork of frequency 256 is loaded with wax. The frequency of the other fork is
(1) 504
(2) 520
(3) 260
(4) 252
The molar ratio of Fe2+ to Fe3+ in a mixture of FeSO4 and Fe2(SO4)3 having equal number of sulphate ions in both ferrous and ferric sulphates is
(1) 1 : 2
(2) 3 : 2
(3) 2 : 3
(4) none of these
The reason of the loss of optical activity of lactic acid when OH group is changed by H, is that
(1) asymmetry of the molecule is destroyed
(2) symmetry of the molecule is destroyed
(3) structural change occurs
(4) spatial arrangement is changed
Which of the following statements regarding phenols is correct ?
(a) Phenols are stronger acid than water and alcohols
(b) Phenols are weaker acids than carboxylic acids
(c) Phenols are soluble in both aqueous NaOH and aqueous NaHCO3
(d) Phenoxide ions are more stable than the corresponding phenols
(1) a, b, c (2) a, b, d
(3) b, c, d (4) None
Which of the following metazoan phyla are grouped under Radiata ?
(1) Arthropoda and Porifera
(2) Cnidaria and Ctenophora
(3) Mollusca and Coelenterata
(4) Mollusca and Echinodermata
Arrange the steps of catalytic action of an enzyme in order and choose the right option.
I. The enzyme releases the products of the reaction and the enzyme is free to bind to another substrate.
II. The active site of enzyme is in close proximity of the substrate and breaks the chemical bonds of the substrate.
III. The binding of substrate induces the enzyme to alter its shape fitting more tightly around the substrate.
IV. The substrate binds to the active site of the enzyme fitting into the active site.
(1) III, IV, II, I (2) III, II, I, IV
(3) IV, II, I, III (4) II, I, IV, III
Voluntary, striated muscles are present in
(a) lungs (b) hind limbs (c) liver (d) heart (e) intestinal wall (f) urinary bladder (g) Iris (h) gall bladder
(1) a, b, d & e
(2) only b
(3) c, d, g & h
(4) All of these
Match the symmetry listed under column-I with the phyla given under column-II, choose the answer which gives the correct combination of the alphabets of the two columns
Column-I (Symmetry) Column-II (Phylum) A. Asmmetry p. Arthropoda B. Radial symmetry q. Ctenophora C. Biradial symmetry r. Cnidaria D. Blilateral symmetry s. Porifera(1) A = s, B = q, C = r, D = p
(2) A = q, B = r, C = s, D = p
(3) A = s, B = r, C = q, D = p
(4) A = r, B = q, C = s, D = p
Basic features of Kranz anatomy of C4-plant is presence of
(1) chloroplast in bundle sheath cells
(2) chloroplast in mesophyll and epidermal cells
(3) typical granal chloroplasts in bundle sheath cells and rudimentary chloroplast in mesophyll cells
(4) agranal chloroplasts in bundle sheath cells and typical granal chloroplasts in mesophyll cells
Pick up the correct match
(1) Xanthium – Long-day plant
(2) Sunflower – Short-day plant
(3) Wheat – Short-day plant
(4) Tomato – Day-neutral plant
Match the column-I and column-II and select the correct option
Column-I Column-II A. Gemmae i. Agaricus B. Exogenous spore ii. Chlamydomonas C. Zoospore iii. Yeast D. Binery fission iv. Marchantia(1) A = iv, B = iii, C = i, D = ii
(2) A = iv, B = iii, C = ii, D = i
(3) A = iv, B = i, C = ii, D = iii
(4) A = ii, B = i, C = iv, D = iii
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