Recent questions tagged q78

An electron and a positron are released $(0,0,0)$ and $(0,01.5 \;R)$ respectively , in a uniform magnetic field $\overrightarrow{B} =B_0 \hat i$, each with an equal momentum of magnitude $P= eBR$ Under what condition on the direction of momentum will the orbit be non- intersecting circles.

asked Jul 31, 2015 by meena.p

1 answer

The earth's field departs from its dipole shape substantially at large distance (greater than about 30,000 km) What agencies may be responsible for this distortion ?

asked Jul 21, 2015 by meena.p

1 answer

Choose the correct alternative: Alloys usually have must ______( lower/higher ) temperature coefficients of resistance than pure metals

asked Jul 2, 2015 by meena.p

1 answer

Which of the following statements is not correct ?

asked Aug 1, 2014 by thanvigandhi_1

1 answer

For which of the following molecule/s significant $\mu\neq 0$?

asked Apr 7, 2014 by sreemathi.v

1 answer

Excess of which vitamin cannot be stored in the body?

asked Mar 30, 2014 by thanvigandhi_1

1 answer

The blast of hot air is introduced from tuyeres during extraction of iron at about.

asked Mar 20, 2014 by meena.p

1 answer

A gas expands from a volume of $3\: dm^3$ against a constant external pressure of $3\: atm$. to a volume of $5\: dm^3$. The work of expansion is used to heat $ 10\: ml$ of water at $290\: K$. Calculate the final temperature of the water.

asked Mar 19, 2014 by thanvigandhi_1

1 answer

The polymer used for the manufacture of paint and laqures is

asked Mar 12, 2014 by thanvigandhi_1

1 answer

The magnetic moment due to spin of unpaired electrons is given by

asked Mar 12, 2014 by meena.p

1 answer

In HCHO,the number of non-bonding electrons,$\sigma$-bonds and $\pi$ bonds are respectively

asked Mar 7, 2014 by sreemathi.v

1 answer

Out of the following , the one containing only nucleophiles is

asked Feb 26, 2014 by meena.p

1 answer

The following ether,when treated with HBr produces

asked Feb 25, 2014 by sreemathi.v

1 answer

The standard reduction potential of $Ag^+/Ag$ electrode at 298K is 0.79V.$K_{sp}$ of Ag$^+$ is $8.7\times 10^{-17}$.Evaluate the standard reduction potential of $I^-/AgI/Ag$ electrode

asked Feb 18, 2014 by sreemathi.v

1 answer

Mixture of volatile components A and B has total vapour pressure (in torr) P=$250-115X_A$ where $X_A$ is mol fraction of 'A' in mixture.Hence $P_A^0$ and $P_B^0$ respectively are (in torr)

asked Feb 14, 2014 by sreemathi.v

1 answer

Find the position of the point (4,-3) relative to the ellipse $5x^2+7y^2=140$?

asked Feb 7, 2014 by sreemathi.v

1 answer

Find the order and degree of differential equation : $e^{\Large\frac{d^6y}{dx^6}}-x^2 \large\frac{d^4y}{dx^4}$$+y=0$

asked Feb 7, 2014 by meena.p

1 answer

Which of the statement about NOT gate is true?

asked Jan 30, 2014 by meena.p

1 answer

What is the formula of calgon?

asked Jan 28, 2014 by sreemathi.v

1 answer

$Cu+H_2\quad\underrightarrow {heat}\quad Cu+x$,$ZnO+y\quad\underrightarrow{heat} \quad Zn+H_2O$,$2AgCl+H_2\rightarrow z+w$.The $x$ is

asked Jan 24, 2014 by sreemathi.v

1 answer

$SO_2+H_2O\rightarrow x$.The $x$ is

asked Jan 21, 2014 by sreemathi.v

1 answer

Number of nodal plane in px-orbital is

asked Jan 15, 2014 by sreemathi.v

1 answer

A tetrahedron has vertices $O(0,0,0),\:A(1,2,1)\:B(2,1,3)\:C(-1,1,2)$. The angle between the faces $OAB$ and $ABC$ is ?

asked Jan 6, 2014 by rvidyagovindarajan_1

1 answer

If $a, b, c$ are in $AP, a, x, b$ and $b, y, c$ in $GP$, what is the progression type for $x^2,b^2,y^2$?

asked Jan 6, 2014 by yamini.v

1 answer

$\lim\limits_{x\to 0}\large\frac{\sin(\pi\cos^2x)}{x^2}$=

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate : $\int (1+2x) (3+4x) .dx$

asked Dec 18, 2013 by meena.p

1 answer

Which one of the following arrangements does not give the correct picture of the trends indicated against it ?

asked Dec 17, 2013 by thanvigandhi_1

0 answers

The structure which join two bones at joints are made up of :

asked Dec 10, 2013 by thanvigandhi_1

0 answers

A man walks 4 mtrs. towards west and then walks 3 mtrs in the direction of $\large\frac{\pi}{6}\:$ radians east of north. What is the displacement of the man from the starting point?

asked Dec 5, 2013 by rvidyagovindarajan_1

1 answer

In which group of animals blastocoels is persistent as body cavity in adults

asked Dec 5, 2013 by thanvigandhi_1

0 answers

$CaO+D_2O\rightarrow Ca(OD)_2\downarrow$

asked Nov 29, 2013 by sreemathi.v

1 answer

Both $HCOOH$ and $CH_3COOH$ solutions have equal $pH$. If $\frac{K_1}{K_2}$ (ratio of acid ionisation constants) of these acids is 4, their molar concentration ratio will be

asked Nov 27, 2013 by mosymeow_1

1 answer

The pearl spot is :

asked Nov 26, 2013 by thanvigandhi_1

0 answers

Haemopoietic stem cells are :

asked Nov 15, 2013 by thanvigandhi_1

0 answers

If $x^2 y-x^3 \large\frac{dy}{dx}$$=y^4 \cos x$ then $x^3\;y$ is equal to :

asked Nov 13, 2013 by meena.p

1 answer

The solution of $(x^2+y^2)dx =2xy \;dy$ is :

asked Nov 7, 2013 by meena.p

1 answer

Match the following

asked Oct 30, 2013 by thanvigandhi_1

1 answer

Consider the decomposition reaction of nitroglycerine $4C_3H_5N_3O_9\rightarrow 6N_2+12CO_2+10H_2O+O_2$. If $200g$ nitroglycerine gives 6.55g $O_2$, then percent yield of the reaction is

asked Oct 29, 2013 by sreemathi.v

1 answer

The solution of $(x+y+1)\large\frac{dy}{dx}$$=1$

asked Oct 28, 2013 by meena.p

1 answer

One of the following shows arrhenotoky in its development

asked Oct 19, 2013 by thanvigandhi_1

1 answer

The solution of the differential equation $\large\frac{dy}{dx}=\frac{x-2y+1}{2x-4y}$ is :

asked Oct 18, 2013 by meena.p

1 answer

If in $\Delta ABC\; \tan\large\frac{A}{2}=\frac{5}{6}$ and $\tan\large\frac{C}{2}=\frac{2}{5}$ then $a,b,c$ are such that

asked Oct 10, 2013 by sreemathi.v

1 answer

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