Recent questions tagged 2010

In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three? –

asked Jul 26, 2018 by pady_1

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The correct order of the decreasing ionic radii among the following isoelectronic species is :

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Which of the following pairs has the same size?

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During the kinetic study of the reaction, $2A+B\to C+D$ following results were obtained: Based on the above data which one of the following is correct?

asked Jul 26, 2018 by pady_1

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Crystal field stabilization energy for high spin$d^4$ octahedral complex is

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An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to:

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Which one of the following ions has electronic configuration $[Ar]3d^6$ (At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

asked Jul 26, 2018 by pady_1

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Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

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A solution of sucrose (molar mass = 342 g $mol^-1$ ) has been prepared by dissolving 68.5 g of sucrose in 1000 g of water. The freezing point of the solution obtained will be : ($K_f$ for water = 1.86 K kg mol –1)

asked Jul 26, 2018 by pady_1

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An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?

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Acetamide is treated with the following reagents separately. Which one of these would yield methyl amine?

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For an endothermic reaction, energy of activation is $E_a$ and enthalpy of reaction is $\delta H$ (both of these in kJ/mol). Minimum value of Ea will be:

asked Jul 26, 2018 by pady_1

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What is in mol/L of a solution that is 0.20 M in $CH_3COONa$ and 0.10 M in $CH_3COOH$ Ka for $CH_3COOH=1.8\times10^-5$

asked Jul 26, 2018 by pady_1

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In a set of reactions, ethyl benzene yielded a product D.

asked Jul 26, 2018 by pady_1

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Which one of the following compounds has the most acidic nature? CH

asked Jul 26, 2018 by pady_1

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For the reaction $N_2O_5(g)\to 2NO_2(g)+\frac12 O_2(g)$ the value of rate of disappearance of $N_2O_5$ is given as$6.25\times10^-3 mo lL^-1 S^-1$. The rate of formation of $NO_2$ and $O_2$ is given respectively as:

asked Jul 26, 2018 by pady_1

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To get an output Y = 1 from the circuit shown below, the input must be â€“

asked Jul 26, 2018 by pady_1

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Consider the following two statements – (A) Kirchhoff's junction law follows from the conservation of charge (B) Kirchhoff's loop law follows from the conservation of energy Which of the following is correct ?

asked Jul 26, 2018 by pady_1

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A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the ? loop. If the force on one arm of the loop is $\overrightarrow{F}$ , the net force on the remaining three arms of the loop is –

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Electromagnets are made of soft iron because soft iron has –

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A common emitter amplifier has a voltage gain of 50, an input impedance of 100$\Omega$ and an output impedance of 200$\Omega$. The power gain of the amplifier is –

asked Jul 26, 2018 by pady_1

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A source $S_1$ is producing, $10^{15}$ photons per second of wavelength 5000 Å. Another source $S_2$ is producing 1.02 × $10^{15}$ photons per second of wavelength 5100 Å. Then, (power of $S_2$)/(power of $S_1$) is equal to –

asked Jul 26, 2018 by pady_1

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A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is –

asked Jul 26, 2018 by pady_1

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In the given circuit the reading of voltmeter $V_1$ and $V_2$ are 300 volts each. The reading of the voltmeter $V_3$ and ammeter A are respectively –

asked Jul 26, 2018 by pady_1

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The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature TK is given by – (Where $\sigma$ is Stefan's Contant)

asked Jul 26, 2018 by pady_1

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If $\bigtriangleup U$ and $\bigtriangleup W$ represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true ?

asked Jul 26, 2018 by pady_1

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Which of the following statement is false for the properties of electromagnetic 2 waves ?

asked Jul 26, 2018 by pady_1

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A gramophone record is revolving with angular velocity $\omega$. A coin is placed at a distance r from the centre of the record. The static coefficient of friction is µ. The coin will revolve with the record if –

asked Jul 26, 2018 by pady_1

1 answer

A galvanometer has a coil of resistance $100\Omega$ and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be –

asked Jul 26, 2018 by pady_1

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Six vectors, $\overrightarrow{a}$ through $\overrightarrow{f}$ have the magnitudes and directions indicated in the figure. Which of the following statements is true?

asked Jul 26, 2018 by pady_1

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A particle of mass M is situated at the center of a spherical shell of same mass and radius a. The gravitational potential at a point situated at $\frac{a}{2}$ distance from the centre, will be –

asked Jul 26, 2018 by pady_1

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Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be –

asked Jul 26, 2018 by pady_1

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The activity of a radioactive sample is measured as N0 counts per minute at t = 0 and N0/e counts per minute at t = 5 minutes. The time (in minutes) at which the activity reduces to half its value is –

asked Jul 26, 2018 by pady_1

2 answers

A conducting circular loop is placed in a uniform magnetic field, B = .025 T with its e plane perpendicular to the loop The radius of the loop is made to shrink at a constant rate of 1 $mms^{–1}$. The induced e.m.f. when the radius is 2 cm, is –

asked Jul 26, 2018 by pady_1

1 answer

A particle moves a distance x in time t according to equation x = $(t + 5)^–1$. The acceleration of particle is proportional to –

asked Jul 26, 2018 by pady_1

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Which one of the following bonds produces a n solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point ?

asked Jul 26, 2018 by pady_1

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The period of oscillation of a mass M suspended from a spring of negligible mass is T. If along with it another mass M is also suspended, the period of oscillation will now be

asked Jul 26, 2018 by pady_1

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A ray of light travelling in a transparent medium of refractive index µ, falls on a surface separating the medium from air at an angle of incidence of 45º. For which of the following value of µ the ray can undergo total internal reflection -

asked Jul 26, 2018 by pady_1

2 answers

A ball is droped from a high rise platform at t = 0 starting fro rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t = 18 s. What is the value of v ? (take g = 10 m/s2)

asked Jul 26, 2018 by pady_1

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A beam of cathode rays is subjected to crossed. Electric (E) and Magnetic fields (B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by – (where V is the potential difference between cathode and anode)

asked Jul 26, 2018 by pady_1

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The radii of circular orbits of two satellite A and B of the earth, are 4R and R, respectively speed of satellite A is 3V, then the speed satellite B will be –

asked Jul 26, 2018 by pady_1

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The displacement of a particle along the x-axis is given by $X=a sin^2\omega t$. The motion of the particle corresponds to –

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Which one of the following statement is FALSE ?

asked Jul 26, 2018 by pady_1

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The two gases making highest relative contribution to the green house gases are –

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Coiling of garden pea tendrils around any support is an example of –

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Which one of the following statements about morula in humans is correct –

asked Jul 26, 2018 by pady_1

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Which one of the following is one of the characteristics of a biological community?

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Satellite DNA is useful tool in –

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Heartwood differs from sapwood in –

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Some of the characteristics of Bt cotton are –

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