Recent questions in 1999

Half life of a substance is 77 days then its decay constant will be :

asked Jun 21, 2018 by pady_1

1 answer

The bombarment of $\alpha$ -particle on $_{7}N^{14}$ , emits proton then new atom will be :

asked Jun 21, 2018 by pady_1

1 answer

Which of the following reaction given by isocyanide :

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1 answer

Clemenson's reaction is :

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1 answer

Which of the following is true for a reaction in which all the reactant & product are liquids :

asked Jun 21, 2018 by pady_1

1 answer

A system is expanded under adiabatic process :

asked Jun 21, 2018 by pady_1

1 answer

Increasing order of bond length is :

asked Jun 21, 2018 by pady_1

1 answer

What is true for a cyclic process :

asked Jun 21, 2018 by pady_1

1 answer

What will be the $H^+$ con when 4 gm NaOH dissolved in 1000 ml. of water :

asked Jun 21, 2018 by pady_1

1 answer

Determine the value of $E^0$ cell for the following reaction : <br> $Cu^{+2}+Sn^{+2}\to Cu+Sn^{+4}$ <br> Equilibrium constant is $10^6$ <br> $Cu^{++}+Sn^{++}\to Cu+Sn^{+4}$

asked Jun 21, 2018 by pady_1

0 answers

Sucrose on hydrolysis gives :

asked Jun 21, 2018 by pady_1

1 answer

Cr in $[Cr(NH_3)_6]$ has number of unpaired electron :

asked Jun 21, 2018 by pady_1

1 answer

$[Cu(NH_3)_4]^{+2}$ reacts with HNO3 in excess of water gives :

asked Jun 21, 2018 by pady_1

0 answers

A compound contain C, H and O. If C = 40% and H = 6.67% then empirical formula of compound will be :

asked Jun 21, 2018 by pady_1

1 answer

Which of the following compound contain zero oxidation state of Fe :

asked Jun 21, 2018 by pady_1

1 answer

Monomer of natural rubber is :

asked Jun 21, 2018 by pady_1

1 answer

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 :

asked Jun 21, 2018 by pady_1

1 answer

Which of the following is a chiral compound :

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

2 answers

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

asked Jun 21, 2018 by pady_1

2 answers

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

asked Jun 21, 2018 by pady_1

1 answer

On the basis of unit cell concept a crystal has :

asked Jun 21, 2018 by pady_1

1 answer

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 :

asked Jun 21, 2018 by pady_1

1 answer

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 :

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

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

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

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 :

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

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 :

asked Jun 21, 2018 by pady_1

0 answers

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

1 answer

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 -

asked Jun 21, 2018 by pady_1

1 answer

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 ( $\gamma=1.5$ ) -

asked Jun 21, 2018 by pady_1

1 answer

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 $(V_{air} = 330 m/s)$ -

asked Jun 21, 2018 by pady_1

1 answer

Depletion layer has (for an unbiased PN junction) -

asked Jun 21, 2018 by pady_1

2 answers

Zener diode is used as -

asked Jun 21, 2018 by pady_1

1 answer

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 -

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

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

asked Jun 21, 2018 by pady_1

1 answer

Neuroglial cells associated with :

asked Jun 21, 2018 by pady_1

1 answer

In inducible operon, regulatory gene synthesize:

asked Jun 21, 2018 by pady_1

1 answer

Simplest reflex action in human is :

asked Jun 21, 2018 by pady_1

1 answer

Recently extinct animal from India is :

asked Jun 21, 2018 by pady_1

1 answer

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