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Recent questions tagged 27
Questions
Match the Xenon compounds in Coloumnâ€“I with its structure in Columnâ€“II and assing the correct code:
neet
chemistry
past papers
2019
27
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 :
jeemain
physics
past papers
1998
27
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 :
jeemain
physics
past papers
1999
27
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 :
jeemain
physics
past papers
2000
27
asked
Dec 19, 2018
by
pady_1
0
answers
The de-Broglie wavelength of an electron having $80\;eV$ energy is nearly : <br> ($1\;eV = 1.6 \times 10^{-19} J $) <br> Mass of electron = $9 \times 10^{-31} kg $ <br> Planck's constant = $6.6 \times 10^{-34} Js $)
jeemain
physics
past papers
2001
27
asked
Dec 11, 2018
by
pady_1
0
answers
The escape velocity of a body depends upon mass as :
jeemain
physics
past papers
2002
27
asked
Dec 11, 2018
by
pady_1
0
answers
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 :<br>
jeemain
physics
past papers
2003
27
asked
Dec 11, 2018
by
pady_1
0
answers
In an a.c circuit, the instantaneous e.m.f and current are given by <br> $e = 100 \sin 30 t$ <br> $i = 20 \sin (30 t - \frac{\pi}{4})$ <br> In one cycle of a.c the average power consumed by the circuit and the wattless current are, respectively :
jeemain
physics
past papers
2018
27
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
jeemain
math
past papers
2017
27
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 :
jeemain
physics
past papers
2016
27
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 $(|e| = 1.6 \times 10^{-19} C, m_e = 9.1 \times 10^{-31} kg, \; h = 6.6 \times 10^{-34} Js)$ :
jeemain
physics
past papers
2015
27
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 :
jeemain
physics
past papers
2014
27
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).
jeemain
chemistry
past papers
2013
27
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
jeemain
math
past papers
2012
27
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 :
jeemain
physics
past papers
2011
27
asked
Dec 11, 2018
by
pady_1
0
answers
Biuret test is not given by
jeemain
chemistry
past papers
2010
27
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 <br>
jeemain
physics
past papers
2009
27
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
jeemain
math
past papers
2008
27
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 :
jeemain
math
past papers
2007
27
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 :
jeemain
physics
past papers
2006
27
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 :
jeemain
math
past papers
2005
27
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 :
jeemain
physics
past papers
2005
27
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
jeemain
math
past papers
2004
27
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 :
neet
physics
past papers
2018
27
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 $5g$ ?
neet
chemistry
past papers
2017
27
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 ?
neet
chemistry
past papers
2016
27
asked
Aug 21, 2018
by
pady_1
1
answer
The correct statement regarding defects in crystalline solids is
neet
chemistry
past papers
2015
27
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 : <br>
neet
physics
past papers
2014
27
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 -
neet
physics
past papers
2013
27
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 :
neet
physics
past papers
2012
27
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 :
neet
physics
past papers
2011
27
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 –
neet
physics
past papers
2010
27
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 :
neet
physics
past papers
2009
27
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
neet
physics
past papers
2008
27
asked
Jul 26, 2018
by
pady_1
1
answer
The total power dissipated in watts in the circuit shown here is :-<br>
neet
physics
past papers
2007
27
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- <br> <br> The logic circuit gate is:
neet
physics
past papers
2006
27
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-
neet
physics
past papers
2005
27
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:-
neet
physics
past papers
2004
27
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
neet
physics
past papers
2003
27
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 : -
neet
physics
past papers
2002
27
asked
Jul 23, 2018
by
pady_1
2
answers
Two waves having equation <br> $x_1 = a \sin (\omega t + \phi_1)$ <br> $x_2 = a \sin (\omega t + \phi_2)$ <br> If in the resultant wave the frequency and amplitude remains equals to amplitude of superimposing waves. Then phase diff. between them :-
neet
physics
past papers
2001
27
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 :
neet
physics
past papers
2000
27
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 : :
neet
physics
past papers
1998
27
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
class5
math
olympiad
logical
analytical
reasoning
27
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?
class5
math
olympiad
data handling
27
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?
class5
math
olympiad
measurements
27
asked
Dec 31, 2015
by
pady_1
0
answers
$\large\frac{6}{19} \div \large\frac{12}{38}$
class5
math
olympiad
fractions
decimals
27
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?
class5
math
olympiad
computation
27
asked
Dec 31, 2015
by
pady_1
0
answers
$\tan h^{-1}x = a\log \bigg(\large\frac{1+x}{1-x}\bigg),| x | < 1 =>a=$
jeemain
eamcet
math
2010
27
asked
Sep 26, 2013
by
meena.p
1
answer
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