Recent questions tagged q111

Densities of air in chandigarh was found to be $1.156kgm^{-3}$. The temperature and pressure were recorded as $20^{\large\circ}C$ and $100.142\; KPa$. The average molecular mass of the air at that place in $g \;mol^{-1}$ is

asked Mar 2, 2014 by sharmaaparna1

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Which of the following compounds are chiral and resolvable ? $(i) \;[C_6 H_5 N^+(CH_2CH_2CH_3)(C_2H_5)(CH_3)]Br^ - ; \; (ii) C_6H_5N(CH_3)(C_2H_5) ; \\ (iii)\; CH_3CH_2CH (CH_3) (C_2H_5);\; (iv)\; HO_2C- CO_2H$

asked Feb 28, 2014 by meena.p

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The claisen rearrangement of the below reaction the product is

asked Feb 26, 2014 by sreemathi.v

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If the line $y=mx+c$ touches the hyperbola $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$ then find the value of c .

asked Feb 10, 2014 by sreemathi.v

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If $a_{1},a_{2},...a_{n}$ are in HP. , Then $\;a_{1}a_{2}+a_{2}a_{3}+.....+a_{n}\;a_{n-1}$ is equal to

asked Jan 20, 2014 by yamini.v

1 answer

Calculate the uncertainty in velocity of a cricket ball (mass=0.15Kg) if its uncertainty position is of the order of $1A^{\large\circ}$

asked Jan 16, 2014 by sreemathi.v

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If $\overrightarrow a,\overrightarrow b,\overrightarrow c$ are unit vectors and $\overrightarrow a+\overrightarrow b+\overrightarrow c$ is also a unit vector and $\alpha,\beta,\gamma $ are angles between $\overrightarrow a\:and\:\overrightarrow b,\:\:\overrightarrow b\:and\:\overrightarrow c\:\:\overrightarrow c\:and\:\overrightarrow a$ respectively, then among the three angles,

asked Jan 6, 2014 by rvidyagovindarajan_1

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Let $f(a)=g(a)=k$ and their $n^{th}$ derivatives $f^n(a)$, $g^n(a)$ exist and are not equal for some n. Further if $\lim\limits_{x\to a}\large\frac{f(a)g(x)-f(a)-g(a)f(x)+f(a)}{g(x)-f(x)}$$=4$, then the value of k is

asked Dec 31, 2013 by sreemathi.v

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Integrate : $\int \large\frac{\tan ^{-1} (e^x)}{1+(e^x)^2}.e^x\;dx$

asked Dec 19, 2013 by meena.p

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Vacuole in a plant cell :

asked Dec 18, 2013 by thanvigandhi_1

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A battery of e.m.f 2.1 V and internal resistance $0.05 \Omega$ is shunted for 5 seconds by a wire of constant resistance $ 0.02 \Omega$ , mass 1 g and specific heat $ 0.1 cal/g/^{\circ}C$ . The rise in the temperature of the wire is :

asked Nov 18, 2013 by thanvigandhi_1

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In the circuit shown in figure, the ammeter shows 5 A current, voltmeter shows 250 v and the internal resistance of the voltmeter is 2500 $ \Omega$ then the value of R is :

asked Nov 2, 2013 by thanvigandhi_1

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An electrical device which offers a low resistance to the current in one direction but a high resistance to the current in opposite direction is

asked Oct 20, 2013 by thanvigandhi_1

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A current of 2 A. flows in an electric circuit as shown in figure. The potential difference $(V_R-V_s)$, in volts ($V_R$ and $V_s$ are potentials at R and S respectively ) is

asked Oct 20, 2013 by meena.p

1 answer

A wire of length 'l' is bent into a circular loop of radius R and carries a current I. The magnetic field at the center of the loop is 'B'. The same wire is now bent into a double loop of equal radii. If both loops carry the same current I and it is in the same direction, the magnetic field at the center of the double loop will be :

asked Oct 14, 2013 by meena.p

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The necessary condition in making of a junction transistor ( E-emitter, B - base and C-collector)

asked Oct 12, 2013 by thanvigandhi_1

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$6 \Omega$ nad $12 \Omega$ resistors are connected in parallel. This combination is connected in series with a $10\;V$ battery and $6 \Omega$ resistor. What is the potential difference between the terminals of the $12 \Omega$ resistor?

asked Sep 30, 2013 by meena.p

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If a bar magnet of pole strength $m$ and magnetic moment M is cut equally 5 times parallel to its axis and again 3 times perpendicular to its axis, then the pole strength and magnetic moment of each piece are respectively:

asked Sep 24, 2013 by meena.p

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In the meter bridge experiment, the length AB of the wire is 1 m. The resistors $X$ and $Y$ have values $5 \Omega$ and $2 \Omega$ respectively. When a shunt resistance $S$ is connected to $X$, the balancing point is found to be $0.625\;m$ from A. Then, the resistance of the shunt is

asked Sep 18, 2013 by meena.p

1 answer

Which of the following is a contradiction ?

asked May 24, 2013 by poojasapani_1

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The asymptotes of the hyperbola $36y^{2}-25x^{2}+900=0$ are

asked May 14, 2013 by poojasapani_1

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