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Recent questions tagged 37
Questions
Match the following (a)Pure nitrogen (i) Chlorine (b) Haber process (ii) Sulphuric acid (c) Contact process (iii) Ammonia (d) Deacon's process (iv) Sodium azide or Barium azid Which of the following is the correct option ? (a) (b) (c) (d) (1) (i) (ii) (iii) (iv) (2) (ii) (iv) (i) (iii) (3) (iii) (iv) (ii) (i) (4) (iv) (iii) (ii) (i)
neet
chemistry
past papers
2019
37
asked
Jul 8, 2019
by
pady_1
1
answer
A wire of resistance $10 \Omega$ is elongated by $10 \%$, the resistance of the elongated wire :
jeemain
physics
past papers
1998
37
asked
Dec 19, 2018
by
pady_1
0
answers
The magnetic field strength at a point at a distance $d$ from the centre, on the axial line of a very short bar magnet of magnetic moment $M$, is $B$. The magnetic induction at a distance $2d$ from centre, on equatorial line of magnet of magnetic moment $8M$, will be :
jeemain
physics
past papers
1999
37
asked
Dec 19, 2018
by
pady_1
0
answers
A particle executing simple harmonic motion has an amplitude of $6\;cm$. Its acceleration at a distance from the mean position $2\;cm$ is $8\;cm/sec^2$. The maximum speed of the particle is :
jeemain
physics
past papers
2000
37
asked
Dec 19, 2018
by
pady_1
0
answers
A force applied by an engine on a train of mass $2.05 \times 10^6 kg$ changes its velocity from $5 \; m/s$ to $25\; m/s$ in 5 minutes. The power of the engine is :
jeemain
physics
past papers
2001
37
asked
Dec 11, 2018
by
pady_1
0
answers
Length of a string tied to two rigid supports is $40 \; cm$. Maximum length (wavelength in cm) of a stationary wave produced on it, is :
jeemain
physics
past papers
2002
37
asked
Dec 11, 2018
by
pady_1
0
answers
Two particles A and B of equal masses are suspended from two massless springs of spring constants $k_1$ and $k_2$, respctively. If the maximum velocities, during oscillations are equal, the ratio of amplitudes of A and B is
jeemain
physics
past papers
2003
37
asked
Dec 11, 2018
by
pady_1
0
answers
Let $S = \{x \in R : x \geq 0$ and $2|\sqrt{x} - 3| + \sqrt{x} (\sqrt{x} - 6) + 6 = 0\}$ Then $S$ :
jeemain
math
past papers
2018
37
asked
Dec 11, 2018
by
pady_1
1
answer
A copper ball of mass $100\; gm$ is at a temperature T. It is dropped in a copper calorimeter of mass $100 \;gm$, filled with $170\; gm$ of water at room temperature. Subsequently, the temperature of the system is found to be $75^{\circ} C$. T is given by : (Given : room temperature = $30^{\circ}C$, specific heat of copper = $0.1 \;cal/gm^{\circ}C$)
jeemain
physics
past papers
2017
37
asked
Dec 11, 2018
by
pady_1
0
answers
The equilibrium constant at $298 \;K$ for a reaction $A+B⇌C+D$ is $100$. If the initial concentration of all the four species were $1\; M$ each, then equilibrium concentration of D (in $mol\; L^{−1}$ ) will be :
jeemain
chemistry
past papers
2016
37
asked
Dec 11, 2018
by
pady_1
0
answers
Gaseous $N_2O_4$ dissociates into gaseous $NO_2$ according to the reaction $ N_2O_4 (g) \leftrightharpoons 2NO_2 (g)$ At $300\; K$ and $1\; atm \;pressure$, the degree of dissociation of $N_2O_4$ is $0.2$. If one mole of $N_2O_4$ gas is contained in a vessel, then the density of the equilibrium mixture is :
jeemain
chemistry
past papers
2015
37
asked
Dec 11, 2018
by
pady_1
0
answers
The integral $\begin{align*} \int_0^{\pi} \sqrt{1 + 4 \sin^2 \frac{x}{2} - 4 \sin \frac{x}{2} \; dx} \end{align*}$ equals
jeemain
math
past papers
2014
37
asked
Dec 11, 2018
by
pady_1
1
answer
If $\displaystyle\int f (x) dx = \Psi (x)$, then $\displaystyle\int x^5 f (x^3) dx$ is equal to
jeemain
math
past papers
2013
37
asked
Dec 11, 2018
by
pady_1
1
answer
A coil is suspended in a uniform magnetic field, with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating; it is very difficult to stop. But if an aluminium plate is placed near to the coil, it stops. This is due to :
jeemain
physics
past papers
2012
37
asked
Dec 11, 2018
by
pady_1
0
answers
If $\frac{dy}{dx} = y + 3 > 0$ and $y(0) = 2$, then $y(In2)$ is equal to
jeemain
math
past papers
2011
37
asked
Dec 11, 2018
by
pady_1
0
answers
Two long parallel wires are at a distance 2d apart. They carry steady equal current flowing out of the plane of the paper as shown. The variation of the magnetic field along the line XX ' is given by
jeemain
physics
past papers
2010
37
asked
Dec 11, 2018
by
pady_1
0
answers
Which of the following statement is incorrect regarding physissorptions ?
jeemain
chemistry
past papers
2009
37
asked
Nov 29, 2018
by
pady_1
0
answers
Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains
jeemain
chemistry
past papers
2008
37
asked
Nov 29, 2018
by
pady_1
0
answers
The solution for $x$ of the equation $\begin{align*}\int_{\sqrt{2}}^x \; \; \frac{dt}{t \sqrt{t^2 -1}} = \frac{\pi}{2} \end{align*}$ is :
jeemain
math
past papers
2007
37
asked
Nov 29, 2018
by
pady_1
0
answers
The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit ? <br>
jeemain
physics
past papers
2006
37
asked
Nov 13, 2018
by
pady_1
0
answers
A spherical iron ball 10 cm in radius is coated with a layer of ice of uniform thickness that melts at a rate of $50\; cm^2/min$. When the thickness of ice is 15 cm, then the rate at which the thickness of ice decreases, is :
jeemain
math
past papers
2005
37
asked
Nov 5, 2018
by
pady_1
0
answers
A Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is :
jeemain
physics
past papers
2005
37
asked
Nov 5, 2018
by
pady_1
1
answer
$\begin{align*} \frac{dx}{\cos x - \sin x} \end{align*}$ is equal to
jeemain
math
past papers
2004
37
asked
Nov 5, 2018
by
pady_1
0
answers
A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes a vertical circle of diameter AB = D. The height h is equal to <br>
neet
physics
past papers
2018
37
asked
Aug 21, 2018
by
pady_1
1
answer
Which of the following pairs of compounds is isoelectronic and isostructural ?
neet
chemistry
past papers
2017
37
asked
Aug 21, 2018
by
pady_1
1
answer
The pressure of $H_2$ required to make the potential of $H_2$-electrode zero in pure water at $298$ K is :
neet
chemistry
past papers
2016
37
asked
Aug 21, 2018
by
pady_1
1
answer
Number of possible isomers for the complex $[Co(en)_2Cl_2]Cl$ will be : (en = ethylene diamine)
neet
chemistry
past papers
2015
37
asked
Aug 21, 2018
by
pady_1
1
answer
It the focal length of objective lens is increased then magnifying power of:
neet
physics
past papers
2014
37
asked
Aug 20, 2018
by
pady_1
1
answer
For photoelectric emission from certain metal the cutoff frequency is $ν$. If radiation of frequency $2ν$ impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass) -
neet
physics
past papers
2013
37
asked
Aug 20, 2018
by
pady_1
1
answer
A concave mirror of focal length $'f_1'$ is placeed at a distance of 'd' from a convex lens of focal length $'f_2'$ A beam of light coming from infinity and falling on this convex lens- concave mirror combination returns to infinity. The dsitance 'd' must equal
neet
physics
past papers
2012
37
asked
Aug 20, 2018
by
pady_1
1
answer
Which of the following is not due to total internal reflection ?
neet
physics
past papers
2011
37
asked
Aug 16, 2018
by
pady_1
1
answer
The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature TK is given by – (Where $\sigma$ is Stefan's Contant)
neet
physics
past papers
2010
37
asked
Jul 26, 2018
by
pady_1
1
answer
A rectangular, a square, a circular and an elliptical loop, all in the (x – y) plane, are moving out of a uniform magnetic field with a r constant velocity, $\overrightarrow{V}=V.\widehat{i}$ . The magnetic field is directed along the negative z-axis direction. The induced emf, during the passage of these loops, come out of the field region, will not remain constant for :
neet
physics
past papers
2009
37
asked
Jul 26, 2018
by
pady_1
1
answer
A galvanometer of resistance 50 $\Omega$ is connected to a battery of 3V along with a resistance of 2950 $\Omega$ in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should be -
neet
physics
past papers
2008
37
asked
Jul 26, 2018
by
pady_1
2
answers
A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately-
neet
physics
past papers
2007
37
asked
Jul 26, 2018
by
pady_1
1
answer
Kirchhoff's first and second laws for electrical circuits are consequences of:-
neet
physics
past papers
2006
37
asked
Jul 25, 2018
by
pady_1
1
answer
The total energy of an electron in the first excit state of hydrogen atom is about –3.4eV. Its kinetic energy in this state is-
neet
physics
past papers
2005
37
asked
Jul 24, 2018
by
pady_1
1
answer
A wheel having moment of inertia $2 kg–m ^{2}$ about its vertical axis, rotates at the rate of 60 rpm about the axis. The torque which can stop the wheel's rotation in one minute would be :-
neet
physics
past papers
2004
37
asked
Jul 24, 2018
by
pady_1
1
answer
A sample of radioactive element has a mass of 10 gm at an instant t = 0. The approximate mass of this element in the sample after two mean lives is :
neet
physics
past papers
2003
37
asked
Jul 24, 2018
by
pady_1
1
answer
Specific resistance of a conductor increases with :
neet
physics
past papers
2002
37
asked
Jul 23, 2018
by
pady_1
1
answer
A dipole of moment $\overrightarrow{p}$ is placed in uniform electric field $\overrightarrow{E}$ then torque acting on it is given by :-
neet
physics
past papers
2001
37
asked
Jul 20, 2018
by
pady_1
1
answer
Nuclear – Fission is best explained by :
neet
physics
past papers
2000
37
asked
Jul 20, 2018
by
pady_1
1
answer
A car is moving with velocity V. If stop after applying break at a distance of 20 m. If velocity of car is doubled, then how much distance it will cover (travel) after applying break :
neet
physics
past papers
1998
37
asked
Jun 15, 2018
by
pady_1
1
answer
Elia swam fewer laps than Mia. Steve swam fewer laps than Elia. Who swam more laps, Steve or Mia?
class5
math
olympiad
logical
analytical
reasoning
37
asked
Dec 31, 2015
by
pady_1
1
answer
Number of set squares in geomentry box is
class5
math
olympiad
data handling
37
asked
Dec 31, 2015
by
pady_1
0
answers
A square garden has sides that are 18 metres long. Fencing costs ₹419.00 per metre. How much would it cost to put a fence around the garden?
class5
math
olympiad
measurements
37
asked
Dec 31, 2015
by
pady_1
0
answers
Shyam and Neha have bookshelves of the same size and holding books of the same sizes. Shyam's shelf is $\large\frac{1}{2}$ full and Neha's shelf is $\large\frac{4}{5}$ full. If 21 more books of the same size are distributed among them, then they can fill their shelves completely. How many books does Neha have today?
class5
math
olympiad
fractions
decimals
37
asked
Dec 31, 2015
by
pady_1
0
answers
What \% is 22 of 44?
class5
math
olympiad
computation
37
asked
Dec 31, 2015
by
pady_1
0
answers
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