Recent questions tagged past papers

Compound 'A' on chlorination gives compound 'B'. 'B' reacts with alc. KOH gives gas 'C', which decolourises Baeyer reagent and ozonolysis of compound 'C' gives only HCHO compound 'A' is :

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Which of the following is a chiral compound :

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Which of the following compound gives p- cresol with p-methyl diazonium chloride :

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According to hardy Schultze law the order of coagulation power of cations will be :

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Phenyl acetylene reacts with dil. $H_2SO_4$ in presence of $HgSO_4$ gives :

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On the basis of unit cell concept a crystal has :

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In compound microscope the magnification is 95, and the distance of object from objective lens 1/3.8 cm and focal length of objective is ¼ cm. What is the magnification of eye pieces when final image is formed at least distance of distinct vision :

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Two particles are projected with same initial velocity one makes angle ? with horizontal while other makes an angle ? with vertical. If their common range is R then product of their time of flight is directly proportional to :

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Frequency of an E.M. waves is 10 MHz then its wavelength is :

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When a stick is released (as shown in fig.). Its free end velocity when it strikes the ground is : l = 0.6m Hinge (ground)

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Two conducting slabs of heat conductivity $K_1$ and $K_2$ are joined as shown in fig. The temp. at ends of the slabs are $\theta_1$ and $\theta_2({\theta_1}>{\theta_2})$ the, final temp. ( $\theta_m$ ) of junction is : <br>

asked Jun 21, 2018 by pady_1

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For a prism its refractive index is cot A/2 then minimum angle of deviation is :

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The half life of a radio nuclide is 77 days then its decay constant is :

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A radio-active elements emits one $\alpha$ and $\beta$ particles then mass no. of daughter element is :

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Two identically charged particles A and B initially at rest, are accelerated by a common potential difference V. They enters into a transverse uniform magnetic field B. They describe a circular path of radii $r_1$and $r_2$ respectively then their mass ratio is :

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The total energy of an electron is 3.555 MeV, then its Kinetic energy is :

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The K.E. of electron and photon is same then relation between their De-Broglie wavelength :

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Light of wavelength 3000 Å in Photoelectric effect gives electron of max. K.E. 0.5 eV. If wavelength change to 2000 Å then max. K.E. of emitted electrons will be :

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A particle is projected with velocity 'u' makes an angle $\theta w.r.t $horizontal. Now it breaks in two identical parts at highest point of trajectory. If one part is retrace its path, then velocity of other part is -

asked Jun 21, 2018 by pady_1

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A sphere maintained at temperature 600 K, has cooling rate R in an external environment of 200 K temp. If its temp. falls to 400 K then its colling rate will be -

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Initial pressure and volume of a gas are P and V respectively. First its volume is expanded to 4V by isothermal process and then again its volume makes to be V by adiabatic process then its final pressure is ($ \gamma=1.5$) -

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A cylindrical tube (L = 125 cm) is resonant with a tuning fork of frequency 330 Hz. If it is filling by water then to get resonance again, minimum length of water column is$ (V_{air} = 330 m/s)$ -

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1 answer

Depletion layer has (for an unbiased PN junction) -

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Zener diode is used as -

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Initially plane of coil is parallel to the uniform magnetic field B. In time $\Delta{t}$it makes to perpendicular to the magnetic field, then charge flows in $\Delta{t}$ depends on this time as -

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The value of R for which power in it is maximum-

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If the power dissipated in $5\Omega$ is 20 W then power dissipated in $4 \Omega$

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The effective capacity of the network between terminals A and B is

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The current in$8\Omega$ resistance is (See fig.)

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Diatomaceous earth is used as heat insulator in boilers and steam pipes because the cell wall of diatom :

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Neuroglial cells associated with :

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In inducible operon, regulatory gene synthesize:

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Simplest reflex action in human is :

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Recently extinct animal from India is :

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Secondary structure of protein, which is attached to lipid layer and lining the pores of cell membrane will be :

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Agglutination occurs in blood present in a test tube. This indicate :

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Shell of egg in bird becomes thin (not properly formed) due to the pollution of pesticides. This is due to interference in the activity of :

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Tendon consist of :

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Ligament consist of :

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Genetic material of prokaryotic cell :

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Which substance can be used as male contraceptive in future :

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Hybridoma is :

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Minute quantity of hormones & steroid are detected by :

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Molecular weight of DNA in yeast is :

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Dental formula of adolescent human being before seventeen year :

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Reptiles like mammals originated in :

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Maximum photosynthesis takes place by :

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Insectivorous plants grow in the soil which is deficient in :

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Main reason of water bloom in rivers, lakes, sea etc. is :

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Which of the following yield maximum energy :

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