Recent questions tagged q100

A change 3 coulomb is moving velocity $\overrightarrow{v}=(4 \hat i +3 \hat j) ms^{-1}$ in a magnetic field $\overrightarrow{B}=(4 \hat i +3 \hat j) wbm^{-2}$Find the force acting on the charge

asked Aug 5, 2015 by meena.p

1 answer

For a para magnetic substance

asked Jul 22, 2015 by meena.p

1 answer

Three point charges $+2q,-q$ and $ +3q$ . What is the electric flux due to this configuration through the surface S?

asked Jul 8, 2015 by meena.p

1 answer

An electric kettle has two coils. When one of these is switched on, the water in the kettle boils in 6 minutes. When the other coil is switched on, the water boils in 3 minutes. If the two coils are connected in parallel , find the time taken to boil the water in the kettle .

asked Jul 3, 2015 by meena.p

1 answer

Which one of the following does not exhibit the phenomenon of mutarotation?

asked Mar 31, 2014 by thanvigandhi_1

1 answer

Magnetic oxide of iron is

asked Mar 20, 2014 by meena.p

1 answer

Ethylene diamine is a example of a _____ ligand.

asked Mar 13, 2014 by meena.p

1 answer

The hybridisation of $'Xe'$ atom in $XeF_4$ molecule is

asked Mar 7, 2014 by sreemathi.v

1 answer

A sinusoidal electromagnetic plane wave travels through the empty space in $x$ - direction. The electric wave is polarized in the $y$ - direction frequency of waves is $1.5\: GHz$. At a certain point $P$ in space, the oscillating $E_y$ attains a maximum magnitude $E_o = 6.3 \: m V/m$ \[\] The direction of magnetic field vector is along?

asked Mar 5, 2014 by thanvigandhi_1

1 answer

Boyle's law may be represented as

asked Feb 28, 2014 by sharmaaparna1

1 answer

When a carbon atom is linked to four different groups it is said to be chiral carbon atom. when alpha hydrogen atom of an alkane is replaced by a functional group we get corresponding compound. How many isomeric alkenes on catalytic reduction gives 3- methylhexane ?

asked Feb 27, 2014 by meena.p

1 answer

When a carbon atom is linked to four different groups it is said to be chiral carbon atom. when alpha hydrogen atom of an alkane is replaced by a functional group we get corresponding compound. How many C- atoms are present in lowest molecular mass optically active alkane?

asked Feb 27, 2014 by meena.p

1 answer

Which of the following carboxylic acid under goes decarboxylation easily?

asked Feb 26, 2014 by sreemathi.v

1 answer

Depression in freezing points of $0.1\;M$ aqueous solution of $HCl,CuSO_4$ and $K_2SO_4$ are

asked Feb 17, 2014 by sreemathi.v

1 answer

Write the equation of conjugate hyperbola for the hyperbola $\large\frac{x^2}{a^2}-\frac{y^2}{b^2}$$=1$

asked Feb 10, 2014 by sreemathi.v

1 answer

The tangent to a curve intersects x axis at $B$ and $y$ at $A$. The normal to same curve intersects $x$ axis at $C$ and $Y$ axis at $D$. Given $\large\frac{AO}{OB}= \frac{OC}{CD}$ curve passes through $(2,3)$. Find the curve

asked Feb 10, 2014 by meena.p

1 answer

Correlation coeffiecient between $x$ and $y$ is $0.5 \: cov ( x,y )=8$ and $\sigma_y=4$ then $ \sigma_x$ is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

In the circuit given below the value of current is :

asked Jan 31, 2014 by meena.p

1 answer

Calcium oxide can be used for drying of

asked Jan 29, 2014 by sreemathi.v

1 answer

What is the volume strength of molar solution of hydrogen peroxide

asked Jan 27, 2014 by sreemathi.v

1 answer

PAN is called as

asked Jan 22, 2014 by sreemathi.v

1 answer

Let $S_{1}, S_{2}$....be the squares such that for each $n\geq\;1$, the length of side of $S_{n}$ = length of diagonal of $S_{n+1}$. If side of $S_{1}$ is 20 cm, the smallest value of n such that area of $S_{n}\;<\;2$ is

asked Jan 20, 2014 by yamini.v

1 answer

In Castner's process of attraction of sodium cathode is

asked Jan 17, 2014 by sreemathi.v

1 answer

Calculate the accelerating potential that must be imparted to a proton beam to give it an effective wavelength of 0.005nm.

asked Jan 16, 2014 by sreemathi.v

1 answer

Let $f(x)$ be a continuous function defined for $1\leq x\leq 3$. If $f(x)$ takes rational value for all $x$ and $f(2) = 10$ then $f(1.5)$ =

asked Dec 31, 2013 by sreemathi.v

1 answer

Integrate : $\large\frac{(1+ \log x)^4}{x}$$dx$

asked Dec 19, 2013 by meena.p

1 answer

Which one of the following is an amine hormone ?

asked Dec 18, 2013 by thanvigandhi_1

0 answers

If $\overrightarrow a,\:\overrightarrow b$ are two non zero and non collinear vectors, then $[\overrightarrow a\:\overrightarrow b\:\hat i]\hat i+[\overrightarrow a\:\overrightarrow b\:\hat j]\hat j+[\overrightarrow a\:\overrightarrow b\:\hat k]\hat k=?$

asked Dec 17, 2013 by rvidyagovindarajan_1

1 answer

Valve of Thebesius is present in the heart of :

asked Dec 11, 2013 by thanvigandhi_1

0 answers

Presence of notochord throughout the life and length of the body is a feature of

asked Dec 5, 2013 by thanvigandhi_1

0 answers

The $pK_a$ of weak acid (HA) is 4.5 . The $pOH$ of an aqueous buffered solution of HA in which 50% of acid is ionized is

asked Nov 27, 2013 by mosymeow_1

1 answer

Mandibles are absent in :

asked Nov 27, 2013 by thanvigandhi_1

0 answers

A cylinder of radius 'R' made of material of coefficient of thermal conductivity $'k_1'$ is surrounded by a cylindrical shell of inner radius 'R' and outer radius 2 R made of a material of coefficient of thermal conductivity $'k_2'$ . The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in the steady state. The effective coefficient of thermal conductivity of the system is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

The solution of the equation $[\sin x+\cos x]^{1+\sin 2x}=2,-\pi\leq x\leq \pi$ is

asked Nov 15, 2013 by sreemathi.v

1 answer

A body is projected vertically upwards from the surface of the earth with a velocity equal to $\large\frac{3}{4}$th escape velocity of earth. If 'R' is the radius of earth, the maximum height attained by the body is :

asked Nov 2, 2013 by thanvigandhi_1

2 answers

What would be the molality of a solution obtained by mixing equal volumes of 30% by weight $H_2SO_4$ ($d=1.218gml^{-1}$) and 70% by weight $H_2SO_4$ ($d=1.610gml^{-1}$)?If the resulting solution has density 1.425g/ml,calculate its molarity.

asked Oct 31, 2013 by sreemathi.v

1 answer

Two roads of lengths $L_1 \: and \: L_2$ are welded together to make a composite rod of length $(L_1 + L_2)$. If the coefficient of linear expansion of the materials of the rods are $( \alpha_1 \: and \: \alpha_2)$ respectively, the effective coefficient of linear expansion of the composite rod is

asked Oct 20, 2013 by thanvigandhi_1

1 answer

Two slabs A and B of equal surface area are placed one over the other such that their surfaces are completely in contact. The thickness of slab A is twice that of B. The coefficient of thermal conductiviy of slab A is twice that of B. The first surface of slab A is maintained at $100^{\circ}C$, while the second surface of slab B is maintained at $25^{\circ}$. The temperature at the contact of their surfaces is

asked Oct 18, 2013 by meena.p

0 answers

In the Young's double slit experiment, the intensities at two points $P_1$ and $P_2$ on the screen are respectively $I_1$ and $I_2$. If $P_1$ is located at the center of a bright fringe and $P_2$ is located at a distance equal to a quarter of fringe width from $P_1$, then $I_1/I_2$ is :

asked Oct 11, 2013 by meena.p

1 answer

A particle mass 'm' is attached to a thin uniform rod of length 'a' at a distance of $ \large\frac{a}{4}$ from the mid point C as shown in the figure . The mass of the rod is '4 m' . The moment of inertia of the combined system about an axis passing through 'O' and perpendicular to the rod is

asked Oct 9, 2013 by thanvigandhi_1

1 answer

Three rods AB,BC and BD made of the same material and having the same cross- section have been joined as shown in the figure. The ends A,C and D are held at temperatures of $20^{\circ},80^{\circ}$ and $80^{\circ}$ respectively. If each rod is of smme length, then the temperature at the junction B of the three rods is :

asked Sep 30, 2013 by meena.p

1 answer

A non-conducting body floats in a liquid at $20^{\circ}C$ with $\large\frac{2}{3}$ of its volume immersed in the liquid. When liquid temperature is increased to $100^{\circ}C,\large\frac{3}{4}$ of body's volume is immersed in the liquid . Then the coefficient of real expansion of the liquid is (neglecting the expansion of the liquid):

asked Sep 24, 2013 by meena.p

1 answer

Two bodies $A$ and $B$ of equal surface area have thermal emissivities of $0.01$ and $0.81$ respectively. The two bodies are radiating energy at the same rate. Maximum energy is radiated from the two bodies A and B at wavelengths $\lambda _A$ and $\lambda_B$ respectively. Difference in these two wavelength is $1 \; \mu m $. If the temperature of the body A is $5802\;K,$ then value of $\lambda _B$ is

asked Sep 17, 2013 by meena.p

1 answer

A particle is fired upward with a speed of $20 \;Km/s$. The speed with which it will move in in interstellar space is

asked Aug 30, 2013 by meena.p

1 answer

A body of mass m moving with velocity v collides head on with another body of mass $2m$ which is initially at rest. The ratio of K.E of colliding body before and after collision will be

asked Aug 9, 2013 by meena.p

1 answer

A particle moves on a rough horizontal ground with some initial velocity $V_0$. If $\large\frac{3}{4}$th of its kinetic energy is lost in friction in time $t_0$ the coefficient of friction is

asked Jul 15, 2013 by meena.p

1 answer

If $f '(x)=\sqrt{x}$ and $f(1)=2$ then $f(x)$ is

asked May 24, 2013 by poojasapani_1

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