Recent questions in 2006

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asked Jul 25, 2018 by pady_1

1 answer

Which of the following is not isostructural with $SiCl_4$:-

asked Jul 25, 2018 by pady_1

0 answers

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of$ NH_3$ (1.5 D) is larger than that of$ NF_$3 (0.2 D). This is because:-

asked Jul 25, 2018 by pady_1

0 answers

In which of the following molecules all the bonds are not equal:-

asked Jul 25, 2018 by pady_1

1 answer

Which of the following is more basic than aniline:-

asked Jul 25, 2018 by pady_1

1 answer

During osmosis, flow of water through a semipermeable membrane is:-

asked Jul 25, 2018 by pady_1

1 answer

Ethylene oxide when treated with Grignard reagent yields:-

asked Jul 25, 2018 by pady_1

0 answers

A hypothetical electrochemical cell is shown below: $ \overset{\Theta}{A} | A^+ (xM)|| B^+ (yM)| \overset{\bigoplus}{B}$ The emf measured is +0.20V. The cell reaction is:

asked Jul 25, 2018 by pady_1

0 answers

Consider the reaction $N_2(g)+3H_2(g)\to2NH_3(g)$ The equality relationship between $\frac{d[NH_3]}{dt}$ and $\frac{-d[H_2]}{dt}$is :-

asked Jul 25, 2018 by pady_1

0 answers

Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields:-

asked Jul 25, 2018 by pady_1

0 answers

The enthalpy of hydrogenation of cyclohexene is $-119.5KJmol^{-1}$. If resonance energy of benzene is $-150.4KJmol^{-1}$ its enthalpy of hydrogenation would be:-

asked Jul 25, 2018 by pady_1

0 answers

Nucleophilic addition reaction will be most favoured in:-

asked Jul 25, 2018 by pady_1

0 answers

The major organic product in the reaction,$CH_3-O-CH(CH_3)_2+HI \to$ Product is:

asked Jul 25, 2018 by pady_1

0 answers

Which one of the following is a peptide hormone:-

asked Jul 25, 2018 by pady_1

1 answer

The enthalpy and entropy change for the reaction: $Br_2(l)+Cl_2(g)\to 2BrCl(g)$ are$30KJ mol^{-1}$ and $105JK^{-1} mol^{-1}$ respectively. The temperature at which the reaction will be in equilibrium is:-

asked Jul 25, 2018 by pady_1

0 answers

$Al_2 O_3$ can be converted to anhydrous $AlCl_3$ by heating:-

asked Jul 25, 2018 by pady_1

0 answers

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]

asked Jul 25, 2018 by pady_1

0 answers

Copper sulphate dissolved in excess of KCN to give:-

asked Jul 25, 2018 by pady_1

1 answer

Given: The mass of electron is $9.11\times10^{-31}$Kg Planck constant is $6.626\times10^{-34}$Js, the uncertainty involved in the measurement of velocity within a distance of 0.1Å is:-

asked Jul 25, 2018 by pady_1

1 answer

More number of oxidation states are exhibited by the actinoids than by the lanthonoids. The main reason for this is:-

asked Jul 25, 2018 by pady_1

1 answer

CsBr crystallizes 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\times10^{23} mol^{-1} $, the density of CsBr is:-

asked Jul 25, 2018 by pady_1

1 answer

The human body does not produce:-

asked Jul 25, 2018 by pady_1

1 answer

Two bodies, A(of mass 1kg) and B(of mass 3kg), are dropped from heights of 16 m and 25 m respectively. The ratio of the time taken by them to reach the ground is:-

asked Jul 25, 2018 by pady_1

1 answer

The vectors $\overrightarrow{A}$ and $\overrightarrow{B}$ are such that $[\overrightarrow{A}+\overrightarrow{B}]=[\overrightarrow{A}-\overrightarrow{B}]$ .The angle between the two vectors is:-

asked Jul 25, 2018 by pady_1

1 answer

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 $\frac{ ml^2}{3}$ ):

asked Jul 25, 2018 by pady_1

1 answer

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 ?. The force exerted by the liquid at the other ends is:-

asked Jul 25, 2018 by pady_1

2 answers

A square surface of side L metres is in the plane of the paper. A uniform electric field E(volt/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:- r E

asked Jul 25, 2018 by pady_1

2 answers

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-

asked Jul 25, 2018 by pady_1

1 answer

A transverse wave propagating along x-axis is represented by $Y(x,t)=8.0 \sin (0.5 \pi x-4\pi-\frac {\pi }{4})$ where x is in metres and t is in seconds. The speed of the wave is:-

asked Jul 25, 2018 by pady_1

1 answer

Kirchhoff's first and second laws for electrical circuits are consequences of:-

asked Jul 25, 2018 by pady_1

1 answer

Power dissipated across the $8\Omega $resistor in the circuit shown here is 2 watt. The power dissipated in watt units across the $3\Omega $ resistor is:

asked Jul 25, 2018 by pady_1

1 answer

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 second:-

asked Jul 25, 2018 by pady_1

1 answer

The Earth is assumed to be a sphere of radius R. A platform is arranged at a height R from the surface of the Earth. The escape velocity of a body from this platform is fv, where v is its escape velocity from the surface of the Earth. The value of f is:-

asked Jul 25, 2018 by pady_1

1 answer

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 are as shown below- The logic circuit gate is:

asked Jul 25, 2018 by pady_1

1 answer

When photons of energy hv fall on an aluminium plate (of work function$E_0 $), 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

asked Jul 25, 2018 by pady_1

1 answer

In a discharge tube ionization of enclosed gas produced due to collisions between:

asked Jul 25, 2018 by pady_1

1 answer

Two coils of self inductances 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:

asked Jul 25, 2018 by pady_1

1 answer

The core of a transformer is laminated because:-

asked Jul 25, 2018 by pady_1

1 answer

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 $X=40+12t-t^{3}$. How long would the particle travel before coming to rest: -

asked Jul 25, 2018 by pady_1

1 answer

A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation $S=\frac{ 1}{ 3}{t^2}$ , where t is in seconds. Work done by the force in 2 seconds is:-

asked Jul 25, 2018 by pady_1

1 answer

For angles of projection of a projectile at angles $(45 ^\circ-\theta)$ and$(45 ^\circ+\theta)$, the horizontal ranges described by the projectile are in the ratio of:

asked Jul 25, 2018 by pady_1

1 answer

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:-

asked Jul 25, 2018 by pady_1

2 answers

Ionization potential of hydrogen atom is 13.6eV. 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:-

asked Jul 25, 2018 by pady_1

1 answer

In a radioactive material the activity at time $t_1$ is $R_1$ and at a later time $t_2$, it is$R_1$. If the decay constant of the material is $\lambda$, then

asked Jul 25, 2018 by pady_1

1 answer

The binding energy of deuteron is 2.2 MeV and that of $_{2}^{4}HE$ is 28MeV. If two deuterons are fused to form one$_{2}^{4}HE$ then the energy released is:-

asked Jul 25, 2018 by pady_1

1 answer

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:-

asked Jul 25, 2018 by pady_1

1 answer

A rectangular block of mass m and area of cross- section A floats in a liquid of density ?. If it given a small vertical displacement from equilibrium it undergoes oscillation with a time period T. Then:-

asked Jul 25, 2018 by pady_1

1 answer

In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will-

asked Jul 25, 2018 by pady_1

1 answer

In producing chlorine through electrolysis 100 watt power at 125V is being consumed. How much chlorine per minute is liberated ? E.C.E. of chlorine is $0.367\times 10^{–6}$ kg/coulomb:-

asked Jul 25, 2018 by pady_1

1 answer

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