Recent questions tagged q94

An electron of energy $2000\;eV$ describes a path in magnetic field of flux density $0.2\;T$ What is the radius of this path ?

asked Aug 4, 2015 by meena.p

1 answer

The value of H on the surface of earth is of the order of ___________

asked Jul 22, 2015 by meena.p

1 answer

ABC is an equilateral triangle of each side $5 \;cm$ . Two charges of $\pm \large\frac{50}{3}$$\times 10^{-3} \mu c$ are placed at A and B respectively . Calculate the magnitude and direction of resultant intensity at C.

asked Jul 8, 2015 by meena.p

1 answer

A metal rod of length $10\;cm$ and a rectangular . Cross section of $1 \;cm \times \large\frac{1}{2}$$\;cm$ is connected to a battery across opposite faces. The resistance will be

asked Jul 3, 2015 by meena.p

1 answer

Which of the following hormones contain iodine?

asked Mar 31, 2014 by thanvigandhi_1

1 answer

S1: $ \Delta G$ and $ \Delta H$ of a reaction always have the same sign. \[\] S2: $ \Delta G_f^{\circ}$ of carbon(graphite) is equal to zero.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

The gemstone ruby is an impure form of alumina having impurity

asked Mar 20, 2014 by meena.p

1 answer

Impurities of lead in silver all removed by

asked Mar 13, 2014 by meena.p

1 answer

The polymer used in orthopedic devices andin controlled drug release is

asked Mar 12, 2014 by thanvigandhi_1

1 answer

Which of the following statement is incorrect on resonance ?

asked Mar 7, 2014 by sreemathi.v

1 answer

According to electromagnetic wave theory, the electric and magnetic field vector associated with the wave is given by \[\] $|E| = E_{max} \cos(kx – \omega t)$ \[\] $|B| = B_{max} \cos(kx – \omega t)$ \[\] The energy of electromagnetic wave is confined in the form of electric and magnetic fields. The energy per unit volume in an electric field is given by $U_E = \large\frac{1}{2} \in_oE^2$ and the energy per unit volume in a magnetic field is given by $ U_M =\large\frac{1}{2} B^2/ \mu_0$ . The energy density associated with the magnetic field is equal to the energy density associated with the electric field. The total energy is equally shared by the electromagnetic as well as magnetic field. The rate of flow of energy in an electromagnetic wave is defined as pointing vector $S = 1/\mu_o (E \times B)$. A plane electromagnetic wave varies sinusoidally at $90\: MHz $ as it travels along the $+ve\: x$ direction. The peak value of the electric field is $2\: millivolt/m$ and it is directed along $ \pm y$ direction \[\] The wavelength and period of the wave is respectively

asked Mar 5, 2014 by thanvigandhi_1

1 answer

The treatment of $LiAlH_4$ with the below one leads to

asked Feb 26, 2014 by sreemathi.v

1 answer

An inductor of inductance $ L = 400\: mH$ and resistors of resistances $R1 = 2\Omega$ and $R2 = 2\Omega$ are connected to a battery of $emf\: 12V$ as shown in the figure. The internal resistance of the battery is negligible. The switch $K$ is closed at $t= 0$. The potential drop across $L$ as a function of time is

asked Feb 13, 2014 by thanvigandhi_1

1 answer

The two curves represents by $9yy'+4x=0,\; y(0)=2,\; yy'+x=0,\; y(0)=3$ then number of common normals for two curves will be

asked Feb 7, 2014 by meena.p

1 answer

Find the length of sub tangent and sub-normal for an ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$?

asked Feb 7, 2014 by sreemathi.v

1 answer

To obtain a p-type semiconductor germanium is doped with

asked Jan 31, 2014 by meena.p

1 answer

Oxalates of alkaline earth metal(s) sparingly soluble in water (is) are

asked Jan 29, 2014 by sreemathi.v

1 answer

$2K_3Fe(CN)_6+2KOH\rightarrow x+y+z$,$H_2O_2+z\rightarrow y+w$.The $w$ is

asked Jan 24, 2014 by sreemathi.v

1 answer

$CF_2Cl_2+hv\rightarrow CF_2Cl+A,CFCl_3+hv\rightarrow CFCl_2+B$.what is A?

asked Jan 22, 2014 by sreemathi.v

1 answer

In an AP, the $\; 4^{th}\;$ term is $36$. The$\; 21^{st}\;$ term is $108$ more than the $\;9^{th}\;$ term. What is the first term a and the common difference $d$?

asked Jan 19, 2014 by yamini.v

1 answer

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n=4 to n=2 of $He^+$ spectrum ?

asked Jan 15, 2014 by sreemathi.v

1 answer

If the vertices of a triangle are $A(1,4,2),\:B(-2,1,2)\:C(2,-3,4)$ then the angle $B$ = ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

If $f(x)=\large\frac{1}{\sqrt{18-x^2}}$ then $\lim\limits_{x\to 3}\large\frac{f(x)-f(3)}{x-3}$ is

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate :$\int \sqrt {4x-x^2}dx$

asked Dec 19, 2013 by meena.p

1 answer

Which one of the following is most reactive towards electrophilic attack?

asked Dec 18, 2013 by thanvigandhi_1

0 answers

The plasmid $ P^{BR}$ 322 used in biotechnology is :

asked Dec 11, 2013 by thanvigandhi_1

0 answers

If $\overrightarrow a=2p\hat i+\hat j$ is rotated about an angle of $\theta$ in anti clock wise direction and becomes $(p+1)\hat i+\hat j$

asked Dec 8, 2013 by rvidyagovindarajan_1

1 answer

The chromosome compliment of heparin honey bees developed parthenogenetically from unfertilized eggs is

asked Dec 5, 2013 by thanvigandhi_1

0 answers

$\Rightarrow A\overset{HBr}{\rightarrow}C_2H_5Br\overset{B}{\rightarrow}A$.A is

asked Nov 29, 2013 by sreemathi.v

1 answer

Ammonium acetate which is 0.01 M, is hydrolysed to 0.001 M concentration. Calculate the change in $pH$ in 0.001 M solution, if initially $pH = pK_a$

asked Nov 27, 2013 by mosymeow_1

1 answer

Spermatophores in earthworm are formed by the secretion of the glands :

asked Nov 27, 2013 by thanvigandhi_1

1 answer

A spherical liquid drop of diameter D breaks up to n identical spherical drops. If the surface tension of the liquid is $' \sigma'$ is , the change in energy in this process is :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

If $-\large\frac{x}{2}$$<\sin^{-1}x<\large\frac{x}{2}$ then $\tan(\sin^{-1}x)$ is equal to

asked Nov 15, 2013 by sreemathi.v

1 answer

A bullet is fired normally towards an immovable wooden block. It loses 25% of its kinetic energy in penetrating through a thickness 'x' of the plank. The total thickness penetrated by the bullet into the block is :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

What volume at NTP of ammonia gas will be required to be passed into 30ml of $NH_2SO_4$ solution to bring down the acid normality to 0.2N

asked Oct 31, 2013 by sreemathi.v

1 answer

An artificial satellite of mass 'm' is revolving around in a circular orbit of radius 'r'. If the mass of earth is M , angular momentum of the satellite with respect to the centre of earth is ( G-Universal Gravitational Constant)

asked Oct 19, 2013 by thanvigandhi_1

1 answer

The surface tension of soap solution is $0.03 N/m$. The work done in blowing to form a soap bubble of surface area $40\;cm^2$, in Joules, is

asked Oct 18, 2013 by meena.p

1 answer

An ideal gas is subjected to a cyclic process ABCD as depicted in the P-V diagram given below :

asked Oct 11, 2013 by meena.p

1 answer

A body of mass 300 kg is moved through 10 m along a smooth inclined plane of angle $30^{\circ}$. The work done in moving in joules is $(g= 9.8\: ms^{-2})$

asked Oct 9, 2013 by thanvigandhi_1

1 answer

The excess pressure inside a spherical soap bubble of radius 1 cm is balanced by a column of oil $(Sp.gr=0.8),2$ mm high, the surface tension of the bubble is :

asked Sep 30, 2013 by meena.p

1 answer

A thin hollow sphere of mass $'m'$ is completely filled with a liquid of mass $'m'$. When the Sphere rolls with a velocity $'c'$, kinetic energy of the system is (neglect friction):

asked Sep 24, 2013 by meena.p

1 answer

A capillary tube of radius 'r' is immersed in water rises to a height of 'h'. Mass of water in the capillary tube is $5 \times 10^{-3}\;kg$. The same capillary tube is now immersed in a liquid whose surface tension is $\sqrt 2$ times the surface tension of water. The angle of contact between the capillary tube and this liquid is $45^{\circ}$. The mass of liquid which rises into the capillary tube now is , (in kg)

asked Sep 17, 2013 by meena.p

1 answer

Period of revolution of an earth satellite close to surface of earth is 90 minutes. The time period of another satellite in an orbit at a distance three times the radius of earth from its surface will be

asked Aug 29, 2013 by meena.p

1 answer

Two small particle of equal masses start moving in opposite direction from A in a horizontal circular path of radius r Their tangential velocity at A are v and 2v, respectively as shown. Where will be the first collision in the path of the circle.

asked Aug 8, 2013 by meena.p

1 answer

A $30\; g$ bullet initially travelling at $120 \;m/s$ penetrates $12\; cm$, into a wooden block. The average resistance exerted by block is

asked Jul 15, 2013 by meena.p

1 answer

The amount present in a radio active element disintegrates at a rate proportional to its amount .The differential equation corresponding to the above statement is ($k$ is negative)

asked May 23, 2013 by poojasapani_1

1 answer

Ask Questions, Get Answers