Recent questions tagged 27

Match the Xenon compounds in Coloumn - I with its structure in Column - II and assigning the correct code:

asked Jul 8, 2019 by pady_1

1 answer

A string in a musical instrument is 50 cm long and its fundamental frequency is 270 Hz. If the desired frequency of 1000 Hz is to be produced, the required string length is :

asked Dec 19, 2018 by pady_1

0 answers

A liquid of mass $M$ and specific heat $S$ is at temperature $2t$. If another liquid of thermal capacity $1.5$ times at a temperature of $\frac{t}{3}$ is added to it, the resultant temperature will be :

asked Dec 19, 2018 by pady_1

0 answers

A force of $5N$ making an angle $\theta$ with the horizontal acting on an object displaces it by $0.4\;m$ along the horizontal direction. If the object gains kinetic energy of $1\;J$ the horizontal component of the force is :

asked Dec 19, 2018 by pady_1

0 answers

The de-Broglie wavelength of an electron having $80\;eV$ energy is nearly : ($1\;eV = 1.6 \times 10^{-19} J $) Mass of electron = $9 \times 10^{-31} kg $ Planck's constant = $6.6 \times 10^{-34} Js $)

asked Dec 11, 2018 by pady_1

0 answers

The escape velocity of a body depends upon mass as :

asked Dec 11, 2018 by pady_1

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A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is :

asked Dec 11, 2018 by pady_1

0 answers

In an a.c circuit, the instantaneous e.m.f and current are given by $e = 100 \sin 30 t$ $i = 20 \sin (30 t - \frac{\pi}{4})$ In one cycle of a.c the average power consumed by the circuit and the wattless current are, respectively :

asked Dec 11, 2018 by pady_1

0 answers

Let $a, \; b, \; c \in R$. If $f(x) = ax^2 + bx + c$ is such that $a + b + c = 3$ and $f(x+y) = f(x) + f(y) + xy, \forall x, y \in R$, then $ \displaystyle\sum_{n=1}^{10} f(n)$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

A galvanometer having a coil resistance of $100 \Omega$ gives a full scale deflection, when a current of $1\; mA$ is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of $10\; A$, is :

asked Dec 11, 2018 by pady_1

0 answers

de-Broglie wavelength of an electron accelerated by a voltage of 50 V is close to $(|e| = 1.6 \times 10^{-19} C, m_e = 9.1 \times 10^{-31} kg, \; h = 6.6 \times 10^{-34} Js)$ :

asked Dec 11, 2018 by pady_1

0 answers

When a rubber-band is stretched by a distance x, it exerts a restoring force of magnitude $F = ax + bx^2$ where a and b are constants. The work done in stretching the unstretched rubber band by L is :

asked Dec 11, 2018 by pady_1

0 answers

Compound (A), $C_8H_9Br$, gives a white precipitate when warmed with alcoholic $AgNO_3$. Oxidatiion of (A) gives a acid (B), $C_8H_6O_4$. (B) easily forms anhydride on heating. Identify the compound (A).

asked Dec 11, 2018 by pady_1

0 answers

An ellipse is drawn by taking a diameter of the circle $(x-1)^2 + y^2 = 1$ as its semiminor axis and a diameter of the circle $x^2+(y-2)^2 = 4$ as its semi-major axis. If the centre of the ellipse is the origin and its axes are the coordinate axes, then the equation of the ellipseis

asked Dec 11, 2018 by pady_1

0 answers

A water fountain on the ground sprinkles water all around it. If the speed of water coming out of the fountain is $v$, the total area around the fountain that gets wet is :

asked Dec 11, 2018 by pady_1

0 answers

Biuret test is not given by

asked Dec 11, 2018 by pady_1

0 answers

An inductor of inductance L =400 mH and resistors of resistances $R_1 = 2 \Omega$ and $R_2 = 2 \Omega$ are connected to a battery of emf 12V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t = 0. The potential drop across L as a function of time is

asked Nov 29, 2018 by pady_1

0 answers

The value of cot $\bigg(cosec^{-1}{\frac{5}{3}}+tan^{-1}{\frac{2}{3}}\bigg)$ is

asked Nov 29, 2018 by pady_1

0 answers

The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is :

asked Nov 29, 2018 by pady_1

0 answers

In a series resonant LCR circuit, the voltage across R is 100 volts and $R = 1\;k \Omega$ with $C = 2 \mu F$. The resonant frequency $\omega$ is 200 rad/s. At resonance the voltage across L is :

asked Nov 13, 2018 by pady_1

0 answers

If $x$ is so small that $x^3$ and higher powers of $x$ may be neglected, then $\frac{(1+x)^{3/2} - (1+\frac{1}{2}x)^3}{(1-x)^{1/2}}$ may be approximated as :

asked Nov 5, 2018 by pady_1

0 answers

A gaseous mixture consists of 16 g of helium and 16 g of oxygen. The ratio $\frac{C_p}{C_{\nu}}$ of the mixture is :

asked Nov 5, 2018 by pady_1

0 answers

The domain of the function $f(x) = \frac{ \sin^{-1} (x-3) }{\sqrt{9-x^2}}$ is

asked Nov 5, 2018 by pady_1

0 answers

A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy $(K_t)$ as well as rotational kinetic energy $(K_r)$ simultaneously. The ratio $K_t : (K_t + K_r)$ for the sphere is :

asked Aug 21, 2018 by pady_1

1 answer

A first order reaction has a specific reaction rate of $10^{–2} sec^{–1}$. How much time will it take for $20 \;g$ of the reactant to reduce to $5g$ ?

asked Aug 21, 2018 by pady_1

1 answer

Which one of the following orders in correct for the bond dissociation enthalpy of halogen molecules ?

asked Aug 21, 2018 by pady_1

1 answer

The correct statement regarding defects in crystalline solids is

asked Aug 21, 2018 by pady_1

1 answer

The resistance in the two arms of the meter bridge are 5 $\Omega$ and R $\Omega$ , respectively. When the resistance R is shunted with an equal resistance, the new balance point is at $1.6 \ell_1$ . The resistance 'R' is :

asked Aug 20, 2018 by pady_1

1 answer

The resistances of the four arms P, Q, R and S in a Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be -

asked Aug 20, 2018 by pady_1

1 answer

The electric field associated with an e. m. wave in vacuum is given by $\overrightarrow{E}=\hat{i}40 cos(KZ-6\times10^8t)$,where E, z and t are in ${volt}{m}$, meter and seconds respectively. The value of wave vector k is :

asked Aug 20, 2018 by pady_1

1 answer

In an ac circuit an alternating voltage $e = 200 \sqrt{2} \sin 100 \; t\; volts$ is connected to a capacitor of capacity $1 \mu F$. The r.m.s. value of the current in the circuit is :

asked Aug 16, 2018 by pady_1

1 answer

A galvanometer has a coil of resistance $100\Omega$ and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be –

asked Jul 26, 2018 by pady_1

1 answer

A bar magnet having a magnetic movement of $2\times10^4 JT^{-1}$ is free to rotate in a horizontal plane. A horizontal magnetic field $B=6\times10^{-4}T$ exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60º from the field is :

asked Jul 26, 2018 by pady_1

1 answer

If the lattice parameter for a crystalline structure is 3.6 Å, then the atomic radius in fcc crystal i

asked Jul 26, 2018 by pady_1

1 answer

The total power dissipated in watts in the circuit shown here is :-

asked Jul 26, 2018 by pady_1

1 answer

The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B and C are as shown below- The logic circuit gate is:

asked Jul 25, 2018 by pady_1

1 answer

The moment of inertia of a uniform circular disc o radius 'R' and mass 'M' about an axis passing from the edge of the disc and normal to the disc is-

asked Jul 24, 2018 by pady_1

2 answers

The ratio of the radii of gyration of a circular disc about a tangential axis in the plane of the disc and of a circular ring of the same radius abou a tangential axis in the plane of the ring is:-

asked Jul 24, 2018 by pady_1

1 answer

A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

asked Jul 24, 2018 by pady_1

1 answer

A lift of mass 1000 Kg which is moving with acceleration of 1 $\frac{m}{s^2}$ in upward direction, then the tension developed in string which is connected to lift is : -

asked Jul 23, 2018 by pady_1

2 answers

Two waves having equation $x_1 = a \sin (\omega t + \phi_1)$ $x_2 = a \sin (\omega t + \phi_2)$ If in the resultant wave the frequency and amplitude remains equals to amplitude of superimposing waves. Then phase diff. between them :-

asked Jul 20, 2018 by pady_1

2 answers

A string is cut into three parts, having fundamental frequencies $n_1$, $n_2$ and $n_3$ respectively. Then original fundamental frequency 'n' related by the expression as :

asked Jul 20, 2018 by pady_1

1 answer

O is the centre of an equilateral triangle ABC $\overrightarrow {F_1} $ , $\overrightarrow {F_2} $ , $\overrightarrow {F_3} $ are three forces acting along the sides AB, BC and AC as shown in fig. What r should be the magnitude of $\overrightarrow {F_3} $ so that total torque about O is zero : :

asked Jun 15, 2018 by pady_1

1 answer

A pineapple costs Rs. 7 each. A watermelon costs Rs. 5 each. X spends Rs. 38 on these fruits. The number of pineapples purchased is

asked Dec 31, 2015 by pady_1

1 answer

While organising her DVD collection, Kendall put 1 DVD on the first rack, 3 DVDs on the second rack, 9 DVDs on the third rack, 27 DVDs on the fourth rack, and 81 DVDs on the fifth rack. If this pattern continues, how many DVDs will Kendall put on the sixth rack?

asked Dec 31, 2015 by pady_1

0 answers

What will be the labor charge for tiling a hall 52 m long and 18 m wide at the rate of $ 8 per sq. m?

asked Dec 31, 2015 by pady_1

0 answers

$\large\frac{6}{19} \div \large\frac{12}{38}$

asked Dec 31, 2015 by pady_1

0 answers

A car travels a distance of 2322 Kms in a full tank of fuel. If the capacity of the tank is 54 litres, how much distance will the car travel on 10 litres of fuel?

asked Dec 31, 2015 by pady_1

0 answers

$\tan h^{-1}x = a\log \bigg(\large\frac{1+x}{1-x}\bigg),| x | < 1 =>a=$

asked Sep 26, 2013 by meena.p

1 answer

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