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A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a commonemitter transistor configuration is :

asked May 25, 2017 by priyanka.c

1 answer

A galvanometer has a $50$ division scale. Battery has no internal resistance. It is found that there is deflection of $40$ divisions when $R=2400 Ω$. Deflection becomes $20$ divisions when resistance taken from resistance box is $4900 Ω$. Then we can conclude :

asked May 25, 2017 by priyanka.c

1 answer

For $x \in R,x \neq -1$, if $(1+x)^{2016} +x(1=x)^{2015} +x^2(1+x)^{2014}+.......+x^{2016}=\sum \limits_{i=0} ^{2016} a_i x^i $, then $a_{17}$ is equal to :

asked May 25, 2017 by meena.p

1 answer

If the four letter words (need not be meaningful ) are to be formed using the letters from the word “MEDITERRANEAN” such that the first letter is R and the fourth letter is E, then the total number of all such words is :

asked May 25, 2017 by meena.p

1 answer

The number of distinct real roots of the equation $P=\begin{vmatrix} \cos x & \sin x & \sin x \\ \sin x & \cos x & \sin x \\ \sin x & \sin x & \cos x \end{vmatrix} = 0 $ in the interval $\bigg[ \large\frac{-\pi}{4} ,\frac{\pi}{4} \bigg]$ is :

asked May 25, 2017 by meena.p

1 answer

If $P=\begin{bmatrix} \large\frac{\sqrt 3}{2} & \frac{1}{2} \\ \large\frac{-1}{2} & \large\frac{\sqrt 3}{2} \end{bmatrix} $ , $A=\begin{bmatrix} 1 & 1 \\ 0 & 1 \end{bmatrix} $ and $Q= PAP^{T}$, then $P^Tq^{2015}P$ is :

asked May 25, 2017 by meena.p

1 answer

A thin $1 m$ long rod has a radius of $5 mm$. A force of $50 πkN$ is applied at one end to determine its Young’s modulus. Assume that the force is exactly known. If the least count in the measurement of all lengths is $0.01 mm$, which of the following statements is false ?

asked May 25, 2017 by priyanka.c

1 answer

A particle of mass m is acted upon by a force $F$ given by the empirical law $F = \frac{R}{t^2} v(t)$. If this law is to be tested experimentally by observing the motion starting from rest, the best way is to plot :

asked May 25, 2017 by priyanka.c

1 answer

A modulated signal $C_m(t)$ has the form $C_m(t)=30 \; \sin \; 300πt+10\; (cos 200πt −\cos 400πt)$. The carrier frequency $f_c$, the modulating frequency (message frequency) $f_ω$, and the modulation index $µ$ are respectively given by :

asked May 25, 2017 by priyanka.c

1 answer

To get an output of 1 from the circuit shown in figure the input must be :

asked May 25, 2017 by priyanka.c

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If the equations $x^2+bx−1=0$ and $x^2+x+b=0$ have a common root different from $−1$, then $|b|$ is equal to :

asked May 25, 2017 by meena.p

1 answer

A neutron moving with a speed ‘v’ makes a head on collision with a stationary hydrogen atom in ground state. The minimum kinetic energy of the neutron for which inelastic collision will take place is

asked May 25, 2017 by priyanka.c

1 answer

The point represented by $2+i$ in the Argand plane moves $1 \;unit $ eastwards, then $2 \;units$ northwards and finally from there $2 \sqrt 2$ units in the south-westwards direction. Then its new position in the Argand plane is at the point represented by :

asked May 25, 2017 by meena.p

1 answer

For $ x \in R, x \neq 0,x \neq 1 ,$ let $f_0(x) =\large\frac{1}{1-x} $ and $f_{n+1}(x) =f_0 (f_n(x)),n =0,1,2$.... Then the value of $f_{100} (3)+f_1\bigg( \large\frac{2}{3}\bigg) +f_2 \bigg( \large\frac{3}{2}\bigg)$ is equal to :

asked May 25, 2017 by meena.p

1 answer

A photoelectric surface is illuminated successively by monochromatic light of wavelengths $ λ$ and $\frac{λ}{2}$. If the maximum kinetic energy of the emitted photoelectrons in the second case is $3\; times $ that in the first case, the work function of the surface is :

asked May 25, 2017 by priyanka.c

1 answer

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

asked May 25, 2017 by meena.p

1 answer

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

1 answer

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

asked May 25, 2017 by meena.p

1 answer

Bouveault-Blanc reduction reaction involves :

asked May 25, 2017 by meena.p

1 answer

The gas evolved on heating $CH_3MgBr$ in methanol is

asked May 25, 2017 by meena.p

1 answer

$5\; L$ 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

1 answer

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

asked May 25, 2017 by meena.p

1 answer

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

1 answer

Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30cm. The wavelength of light 600 nm. To see the stars just resolved by the telescope, the minimum distance between them should be (1 light year = $9.46 \times 10^{15} m$) of the order of :

asked May 24, 2017 by priyanka.c

1 answer

A hemispherical glass body of radius $10 cm$ and refractive index $1.5$ is silvered on its curved surface. A small air bubble is $6 cm$ below the flat surface inside it along the axis. The position of the image of the air bubble made by the mirror is seen:

asked May 24, 2017 by priyanka.c

1 answer

Consider an electromagnetic wave propagating in vacuum. Choose the correct statement :

asked May 24, 2017 by priyanka.c

1 answer

A conducting metal circular-wire-loop of radius $r$ is placed perpendicular to a magnetic field which varies with time as $B = B_0 e^{-t/τ} $= , where $B_0$ and $τ$ are constants, at time $t=0$. If the resistance of the loop is $R$ then the heat generated in the loop after a long time $( t →\propto)$ is :

asked May 24, 2017 by priyanka.c

1 answer

A fighter plane of length $20 m$, wing span (distance from tip of one wing to the tip of the other wing) of $15 m$ and height $5 m$ is flying towards east over Delhi. Its speed is $240 ms^{−1}$. The earth’s magnetic field over Delhi is $5×10^{−5} T$ with the declination angle $~0^0$ and dip of $θ$ such that $\sin θ = \frac{2}{3}$. If the voltage developed is $V_B$ between the lower and upper side of the plane and $V_W$ between the tips of the wings then $V_B$ and $V_W$ are close to :

asked May 24, 2017 by priyanka.c

1 answer

BOD stands for :

asked May 24, 2017 by meena.p

1 answer

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

asked May 24, 2017 by meena.p

1 answer

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

asked May 24, 2017 by meena.p

1 answer

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

asked May 24, 2017 by meena.p

1 answer

The group of molecules having identical shape is :

asked May 24, 2017 by meena.p

1 answer

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

asked May 24, 2017 by meena.p

1 answer

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

asked May 24, 2017 by meena.p

1 answer

Identify the incorrect statement regarding heavy water :

asked May 24, 2017 by meena.p

1 answer

Consider a thin metallic sheet perpendicular to the plane of the paper moving with speed $'v'$ in a uniform magnetic field B going into the plane of the paper (see figure) . If charge densities $\sigma _1$ and $\sigma_2$ are induced on the left and right surfaces, respectively, of the sheet then (ignore fringe effects) :

asked May 24, 2017 by priyanka.c

1 answer

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

asked May 24, 2017 by meena.p

1 answer

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

asked May 24, 2017 by meena.p

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

asked May 24, 2017 by meena.p

1 answer

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

asked May 24, 2017 by meena.p

1 answer

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

asked May 24, 2017 by meena.p

1 answer

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