Recent questions tagged 2016

The most appropriate method of making egg-albumin sol is :

asked May 25, 2017 by meena.p

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The artificial sweetener that has the highest sweetness value in comparison to cane sugar is :

asked May 25, 2017 by meena.p

1 answer

Consider the following sequence for aspartic acid :

asked May 25, 2017 by meena.p

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The test to distinguish primary, secondary and tertiary amines is :

asked May 25, 2017 by meena.p

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Bouveault-Blanc reduction reaction involves :

asked May 25, 2017 by meena.p

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The gas evolved on heating $CH_3MgBr$ in methanol is

asked May 25, 2017 by meena.p

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$5\; L$ of an alkane requires $25\; L$ of oxygen for its complete combustion. If all volumes are measured at constant temperature and pressure, the alkane is :

asked May 25, 2017 by meena.p

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The hydrocarbon with seven carbon atoms containing a neopentyl and a vinyl group is :

asked May 25, 2017 by meena.p

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An organic compound contains C, H and S. The minimum molecular weight of the compound containing $8\%$ sulphur is : (atomic weight of $S=32 amu$)

asked May 25, 2017 by meena.p

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BOD stands for :

asked May 24, 2017 by meena.p

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Identify the correct trend given below : (Atomic No.= $Ti : 22, Cr : 24$ and $Mo : 42$)

asked May 24, 2017 by meena.p

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Which one of the following complexes will consume more equivalents of aqueous solution of $Ag(NO_3)$ ?

asked May 24, 2017 by meena.p

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Which one of the following species is stable in aqueous solution?

asked May 24, 2017 by meena.p

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The group of molecules having identical shape is :

asked May 24, 2017 by meena.p

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Match the items in Column I with its main use listed in Column II :

asked May 24, 2017 by meena.p

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The correct order of the solubility of alkaline-earth metal sulphates in water is :

asked May 24, 2017 by meena.p

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Identify the incorrect statement regarding heavy water :

asked May 24, 2017 by meena.p

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The plot shows the variation of −ln Kp versus temperature for the two reactions.

asked May 24, 2017 by meena.p

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The non-metal that does not exhibit positive oxidation state is :

asked May 24, 2017 by meena.p

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A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process :

asked May 24, 2017 by meena.p

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The reaction of ozone with oxygen atoms in the presence of chlorine atoms can occur by a two step process shown below :

asked May 24, 2017 by meena.p

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What will occur if a block of copper metal is dropped into a beaker containing a solution of $1\;M\; ZnSO_4$ ?

asked May 24, 2017 by meena.p

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Assertion : Rayon is a semisynthetic polymer whose properties are better than natural cotton. <br> Reason : Mechanical and aesthetic properties of cellulose can be improved by acetylation.

asked May 24, 2017 by meena.p

1 answer

For the reaction, $A(g)+B(g) \to C(g)+D(g), \; \Delta H^0$ and $\Delta S^0$ are,respectively, $−29.8\; kJ\; mol^{−1}$ and $−0.100\; kJ K^{−1} mol^{−1}$ at $298\; K$. The equilibrium constant for the reaction at $298\; K$ is :

asked May 24, 2017 by meena.p

1 answer

The solubility of $N_2$ in water at $300\; K$ and $500\;torr$ partial pressure is $0.01 \;g\; L^{−1}$. The solubility (in g L−1) at 750 torr partial pressure is :

asked May 24, 2017 by meena.p

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A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following :

asked May 24, 2017 by meena.p

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Which intermolecular force is most responsible in allowing xenon gas to liquefy ?

asked May 24, 2017 by meena.p

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The total number of orbitals associated with the principal quantum number 5 is :

asked May 24, 2017 by meena.p

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At very high pressures, the compressibility factor of one mole of a gas is given by :

asked May 24, 2017 by meena.p

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The amount of arsenic pentasulphide that can be obtained when $35.5\;g$ arsenic acid is treated with excess $H_2S$ in the presence of conc. $HCl$ ( assuming 100% conversion) is

asked May 24, 2017 by meena.p

1 answer

An unknown transistor needs to be identified as a $npn$ or $pnp$ type. A multimeter, with $+ve$ and $−ve$ terminals, is used to measure resistance between different terminals of transistor. If terminal 2 is the base of the transistor then which of the following is correct for a $pnp$ transistor ?

asked May 23, 2017 by meena.p

1 answer

An experiment is performed to determine the $I - V$ characteristics of a Zener diode,which has a protective resistance of $R=100 \Omega$, and a maximum power of dissipation rating of $1 \;W$. The minimum voltage range of the DC source in the circuit is :

asked May 23, 2017 by meena.p

1 answer

To find the focal length of a convex mirror, a student records the following data :The focal length of the convex lens is $f_1$ and that of mirror is $f_2$. Then taking index correction to be negligibly small, $f_1$ and $f_2$ are close to :

asked May 23, 2017 by meena.p

1 answer

To know the resistance G of a galvanometer by half deflection method, a battery of emf $V_E$ and resistance $R$ is used to deflect the galvanometer by angle $\theta$. If a shunt of resistance $S$ is needed to get half deflection then $G, R$ and $S$ are related by the equation :

asked May 23, 2017 by meena.p

1 answer

A uniformly tapering conical wire is made from a material of Young’s modulus $Y$ and has a normal, unextended length $L$. The radii, at the upper and lower ends of this conical wire, have values $R$ and $3R$,respectively. The upper end of the wire is fixed to a rigid support and a mass $M$ is suspended from its lower end. The equilibrium extended length, of this wire,would equal :

asked May 23, 2017 by meena.p

1 answer

A simple pendulum made of a bob of mass m and a metallic wire of negligible mass has time period $2\;s$ at $T=0^{\circ}C$. If the temperature of the wire is increased and the corresponding change in its time period is plotted against its temperature, the resulting graph is a line of slope $S$. If the coefficient of linear expansion of metal is $\alpha$ then the value of $S$ is :

asked May 23, 2017 by meena.p

1 answer

An audio signal consists of two distinct sounds : one a human speech signal in the frequency band of $200\; Hz$ to $2700\; Hz$, while the other is a high frequency music signal in the frequency band of $10200\; Hz$ to $15200\; Hz$. The ratio of the AM signal bandwidth required to send both the signals together to the AM signal bandwidth required to send just the human speech is :

asked May 23, 2017 by meena.p

1 answer

The truth table given in fig. represents :

asked May 23, 2017 by meena.p

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A hydrogen atom makes a transition from $n=2$ to $n=1$ and emits a photon. This photon strikes a doubly ionized lithium atom $(z=3)$ in excited state and completely removes the orbiting electron. The least quantum number for the excited state of the ion for the process is :

asked May 22, 2017 by meena.p

1 answer

When photons of wavelength $\lambda_1$ are incident on an isolated sphere, the corresponding stopping potential is found to be V. When photons of wavelength $\lambda_2$ are used, the corresponding stopping potential was thrice that of the above value. If light of wavelength $\lambda_3$ is used then find the stopping potential for this case :

asked May 22, 2017 by meena.p

1 answer

In Young’s double slit experiment, the distance between slits and the screen is $1.0\; m$ and monochromatic light of $600\; nm$ is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits is varied, the interference pattern disappears for a particular distance $d_0$ between the slits. If the angular resolution of the eye is $\large\frac{1^{\circ}}{60}$ the value of $d_0$ is close to

asked May 22, 2017 by meena.p

1 answer

A convex lens, of focal length 30 cm, a concave lens of focal length 120 cm, and a plane mirror are arranged as shown. For an object kept at a distance of 60 cm from the convex lens, the final image, formed by the combination, is a real image, at a distance of :

asked May 22, 2017 by meena.p

1 answer

Microwave oven acts on the principle of :

asked May 22, 2017 by meena.p

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A series $LR$ circuit is connected to a voltage source with $V(t)=V_0\; sin \omega t$. After very large time, current I(t) behaves as $\bigg( t_0 >> \large\frac{L}{R} \bigg)$:

asked May 22, 2017 by meena.p

1 answer

A $50 \Omega$ resistance is connected to a battery of $5 \;V$. A galvanometer of resistance $100\;Ω$ is to be used as an ammeter to measure current through the resistance, for this a resistance rs is connected to the galvanometer. Which of the following connections should be employed if the measured current is within $1 \%$ of the current without the ammeter in the circuit ?

asked May 22, 2017 by meena.p

1 answer

A magnetic dipole is acted upon by two magnetic fields which are inclined to each other at an angle of $75^{\circ}$. One of the fields has a magnitude of $15\; mT$. The dipole attains stable equilibrium at an angle of $30^{\circ}$ with this field. The magnitude of the other field (in mT ) is close to :

asked May 19, 2017 by meena.p

1 answer

In the circuit shown, the resistance r is a variable resistance. If for $r=f R$, the heat generation in r is maximum then the value of f is :

asked May 19, 2017 by meena.p

1 answer

Three capacitors each of $4 \mu F$ are to be connected in such a way that the effective capacitance is $6 \mu F$. This can be done by connecting them :

asked May 19, 2017 by meena.p

1 answer

The potential (in volts) of a charge distribution is given by $V(z) =30-5z^2$ for $|z| \leq 1\;m$$V(z) =35-10|z|$ for $|z| \geq 1\;m$ $V(z)$ does not depend on x and y .If this potential is generated by a constant charge per unit volume $\rho_0,$ (in units of $\in_0$) which is spread over certain region ,then choose the correct statement

asked May 18, 2017 by meena.p

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Two engines pass each other moving in opposite directions with uniform speed of $30\;m/s$. One of them is blowing a whistle of frequency $540\; Hz$. Calculate the frequency heard by driver of second engine before they pass each other. Speed of sound is $330\; m/sec$

asked May 18, 2017 by meena.p

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