Recent questions tagged past paper

It is because of inability of $ns^2$ electrons of the valence shell to participate in bonding that :

asked Nov 6, 2017 by meena.p

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Which one is the most acidic compound?

asked Nov 6, 2017 by meena.p

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If molality of the dilute solution is doubled , the value of molal depression constant $(k_f)$ will be :

asked Nov 6, 2017 by meena.p

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The species, having bond angles of $120^{\circ}$ is :

asked Nov 6, 2017 by meena.p

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Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating ?

asked Nov 6, 2017 by meena.p

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Concentration of the $Ag^{+}$ ions in a saturated solution of $Ag_2C_2O_4$ is $2.2x10^{-4}\; mol L^{-1}$ Solubility product of $Ag_2C_2O_4$, is:

asked Nov 6, 2017 by meena.p

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Which is the incorrect statement ?

asked Nov 2, 2017 by meena.p

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Mixture ofchloroxylenol and terpineol acts as

asked Nov 2, 2017 by meena.p

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$HgCl_2$ and $I_2$ both when dissolved in water containing $I^{-}$ ions the pair of species formed is :

asked Nov 2, 2017 by meena.p

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Which of the following pairs of compounds is isoelectronic and isostructural ?

asked Nov 2, 2017 by meena.p

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With respect to the conformers of ethane, which of the following statements is true ?

asked Oct 31, 2017 by meena.p

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The resistance of a wire is 'R' ohm. If it i-s melted and stretched to 'n' times its original length , its new resistance will be :

asked Oct 31, 2017 by meena.p

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A thin prism having refracting angle $10^{\circ}$ is made of glass of refractive index $1.42$ . This prism is combined with another thin prism of glass of refractive index $1.7$. This combination produces dispersion without deviation. The refracting angle of second prism should be :

asked Oct 31, 2017 by meena.p

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The two nearest harmonics of a tube closed at one end are open at other end are 220 Hz and 260 Hz .What is the fundamental frequency of the system ? end

asked Oct 31, 2017 by meena.p

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A rope is wound around a linder of mass $3 \;kg$ and radius $40\; cm$. What is the angular acceleration of the cylinder if the rope is pulled with a force of $30\; N$?

asked Oct 31, 2017 by meena.p

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A beam cf light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle $\theta$, the spot of the light is found to move through a distance $y$ on the scale. The angle $\theta$ is given by :

asked Oct 31, 2017 by meena.p

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Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time $t_1$. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time $t_2$. The time taken by her to walk up on the moving escalator will be

asked Oct 31, 2017 by meena.p

1 answer

Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities $\omega_1$ and $\omega_2$. They are brought into contacl face to face coinciding the axis of rotation. The expression for loss of energy during this process is

asked Oct 31, 2017 by meena.p

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A long solenoid of diameter $0.1\; m$ has $2 \times 10^{4}$ turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to -OA from 4A in 0.05s. If the resistance of the coil is $10 \pi^2 \Omega$ the total charge flowing through the coil during this time is :

asked Oct 31, 2017 by meena.p

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Two Polaroids $P_1$, and $P_2$ are placed with their axis perpendicular to each other. Unpolarised light $I_o$ is incident on $P_1$. A third polaroid $P_3$, is kept in -between $P_1$, and $P_2$, such that its axis makes an angle $45^{\circ}$ with that of $P_1$. The intensity of transmitted Iight through $P_2$, is:

asked Oct 31, 2017 by meena.p

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Two blocks A and B of masses $3\;m$ and $m$ respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively :

asked Oct 31, 2017 by meena.p

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A Spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the po35:r radiated in watt would be

asked Oct 31, 2017 by meena.p

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Consider a drop of rain water having mass 1 g falling from a height of 1km. It hits the ground with a speed of 50 m/s. Take 'g' constant with a value $10 m/s^2$ . The work done by the (i) gravitational force and the (ii) resistive force of air is:

asked Oct 31, 2017 by meena.p

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The ratio of resolving powers of an optical microscope for two wavelengths $\lambda_1=4000 A$ and $\lambda_2 =6000 A$ is:

asked Oct 31, 2017 by meena.p

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The bulk modulus of a sphericaI object is B. lf it is subjected to , uniform pressure 'p' , the fractional decrease in radius is

asked Oct 27, 2017 by meena.p

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In an electromagnetic wave in free space the root mean square value of the electric field is $E_{rms} = 6V/m.$ The peak value of the magnetic field is:

asked Oct 27, 2017 by meena.p

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Two astronauts are floating in gravitational free space after having lost contact with their space ship. The two will :

asked Oct 27, 2017 by meena.p

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An arrangement of three parallel straight wires placed perpendicular to plane of papei carrying same current'I' along the same direction is shown in the figure . Magnitude of force per unit length on the middle wire'B' is given by

asked Oct 27, 2017 by meena.p

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If $\theta_1$ and $\theta_2$, be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip 0 is given by :

asked Oct 27, 2017 by meena.p

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A carnot engine having an efficiency of $\large\frac{1}{10}$ as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energv absorbed from the reservoir at lower temperature is :

asked Oct 27, 2017 by meena.p

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Which of the following statements are correct ?

asked Oct 26, 2017 by meena.p

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The acceleration due to gravity at a height I km above the earth is the same as at a depth d below the , surface of earth. Then :

asked Oct 26, 2017 by meena.p

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The given electricaI network is equivalent to

asked Oct 25, 2017 by meena.p

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A spring of force constant k is cut into lengths of ratio $I : 2 :3$ . They are connected in series and the, new force constant is 'K'.- Then they are connected is parallel and force constant is k". Then k, : k, is

asked Oct 25, 2017 by meena.p

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Which one of the following represents; forward bias diode?

asked Oct 11, 2017 by meena.p

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