Email
Chat with tutors
Login
Ask Questions, Get Answers
Menu
X
home
ask
tuition
questions
practice
papers
mobile
tutors
pricing
X
Recent questions tagged 2015
Questions
The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them :
jeemain
chemistry
past papers
2015
40
asked
Dec 11, 2018
by
pady_1
0
answers
The reaction $2N_2O_5 (g) \to 4NO_2 (g) +O_2 (g)$ follows first order kinetics. The pressure of a vessel containing only $N_2O_5$ was found to increase from $50\; mm \;Hg$ to $87.5\; mm \;Hg$ in $30\; min$. The pressure exerted by the gases after $60 \;min$. will be (Assume temperature remains constant) :
jeemain
chemistry
past papers
2015
39
asked
Dec 11, 2018
by
pady_1
0
answers
A variable, opposite external potential $(E_{ext})$ is applied to the cell $Zn|Zn^{2+} \; (1M) || Cu^{2+} \; (1M) | Cu$, of potential $1.1\;V$. When $E_{ext} < 1.1\;V$ and $E_{ext} > 1.1 \;V$, respectively electrons flow from :
jeemain
chemistry
past papers
2015
38
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
A solution at $20^{\circ}C$ is composed of $1.5\; mol$ of benzene and $3.5\; mol$ of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are $74.7\; torr$ and $22.3\; torr$, respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively :
jeemain
chemistry
past papers
2015
36
asked
Dec 11, 2018
by
pady_1
0
answers
The heat of atomization of methane and ethane are $360\; kJ/mol$ and $620\; kJ/mol$, respectively. The longest wavelength of light capable of breaking the $C - C$ bond is (Avogadro number =$ 6.02 \times 10^{23} ,\; h =6.62 \times 10^{-34}\; J s$) :
jeemain
chemistry
past papers
2015
35
asked
Dec 11, 2018
by
pady_1
0
answers
After understanding the assertion and reason, choose the correct option. <br> Assertion : In the bonding molecular orbital (MO) of $H_2$ , electron density is increased between the nuclei. <br> Reason : The bonding MO is $\Psi_A + \Psi_B$ , which shows destructive interference of the combining electron waves
jeemain
chemistry
past papers
2015
34
asked
Dec 11, 2018
by
pady_1
0
answers
If the principal quantum number n56, the correct sequence of filling of electrons will be :
jeemain
chemistry
past papers
2015
33
asked
Dec 11, 2018
by
pady_1
0
answers
Which of the following is not an assumption of the kinetic theory of gases ?
jeemain
chemistry
past papers
2015
32
asked
Dec 11, 2018
by
pady_1
1
answer
A sample of a hydrate of barium chloride weighing 61 g was heated until all the water of hydration is removed. The dried sample weighed $52\; g$. The formula of the hydrated salt is : (atomic mass, $Ba=137 \;amu,\; Cl = 35.5 \;amu$)
jeemain
chemistry
past papers
2015
31
asked
Dec 11, 2018
by
pady_1
0
answers
Diameter of a steel ball is measured using a Vernier callipers which has divisions of 0.1 cm on its main scale (MS) and 10 divisions of its vernier scale (VS) match 9 divisions on the main scale. Three such measurements for a ball are given as : <br> <br> If the zero error is 20.03 cm, then mean corrected diameter is :
jeemain
physics
past papers
2015
30
asked
Dec 11, 2018
by
pady_1
0
answers
In an unbiased n-p junction electrons diffuse from n - region to p - region because :
jeemain
physics
past papers
2015
29
asked
Dec 11, 2018
by
pady_1
0
answers
If one were to apply Bohr model to a particle of mass $'m'$ and charge $'q'$ moving in a plane under the influence of a magnetic field $'B'$, the energy of the charged particle in the $n^{th}$ level will be :
jeemain
physics
past papers
2015
28
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
A telescope has an objective lens of focal length 150 cm and an eyepiece of focal length 5 cm. If a 50 m tall tower at a distance of 1 km is observed through this telescope in normal setting, the angle formed by the image of the tower is $\theta$, then $\theta$ is close to :
jeemain
physics
past papers
2015
26
asked
Dec 11, 2018
by
pady_1
0
answers
A parallel beam of electrons travelling in $x$-direction falls on a slit of width $d$ (see figure). If after passing the slit, an electron acquires momentum $p_{_y}$ in the $y$-direction then for a majority of electrons passing through the slit ($h$ is Planck's constant) : <br>
jeemain
physics
past papers
2015
25
asked
Dec 11, 2018
by
pady_1
0
answers
You are asked to design a shaving mirror assuming that a person keeps it 10 cm from his face and views the magnified image of the face at the closest comfortable distance of 25 cm. The radius of curvature of the mirror would then be :
jeemain
physics
past papers
2015
24
asked
Dec 11, 2018
by
pady_1
0
answers
An electromagnetic wave travelling in the $x$-direction has frequency of $2 \times 10^{14}\; Hz$ and electric field amplitude of $27\; Vm^{-1}$ . From the options given below, which one describes the magnetic field for this wave ?
jeemain
physics
past papers
2015
23
asked
Dec 11, 2018
by
pady_1
0
answers
In the circuits (a) and (b) switches $S_1$ and $S_2$ are closed at $t = 0$ and are kept closed for a long time. The variation of currents in the two circuits for $t \geq 0$ are roughly shown by (figures are schematic and not drawn to scale) : <br>
jeemain
physics
past papers
2015
22
asked
Dec 11, 2018
by
pady_1
0
answers
When current in a coil changes from $5\; A$ to $2\; A$ in $0.1 \;s$, an average voltage of $50\; V$ is produced. The self - inductance of the coil is :
jeemain
physics
past papers
2015
21
asked
Dec 11, 2018
by
pady_1
0
answers
A $25 \;cm$ long solenoid has radius $2\; cm$ and $500$ total number of turns. It carries a current of $15\; A$. If it is equivalent to a magnet of the same size and magnetization $\overrightarrow{M}$ (magnetic moment/volume), then $|\overrightarrow{M}|$ is :
jeemain
physics
past papers
2015
20
asked
Dec 11, 2018
by
pady_1
0
answers
A proton (mass m) accelerated by a potential difference V flies through a uniform transverse magnetic field B. The field occupies a region of space by width $'d'$. If $'\alpha'$ be the angle of deviation of proton from initial direction of motion (see figure), the value of sin a will be : <br>
jeemain
physics
past papers
2015
19
asked
Dec 11, 2018
by
pady_1
0
answers
A $10V$ battery with internal resistance $1 \Omega$ and a $15V$ battery with internal resistance $0.6 \Omega$ are connected in parallel to a voltmeter (see figure). The reading in the voltmeter will be close to : <br>
jeemain
physics
past papers
2015
18
asked
Dec 11, 2018
by
pady_1
0
answers
Suppose the drift velocity $v_{_d}$ in a material varied with the applied electric field $E$ as $v_{_d} \propto \sqrt{E}$ ; . Then $V - I$ graph for a wire made of such a material is best given by :
jeemain
physics
past papers
2015
17
asked
Dec 11, 2018
by
pady_1
0
answers
If the capacitance of a nanocapacitor is measured in terms of a unit $'u'$ made by combining the electronic charge $'e'$, Bohr radius $'a_0$, Planck's constant $'h'$ and speed of light $'c'$ then :
jeemain
physics
past papers
2015
16
asked
Dec 11, 2018
by
pady_1
0
answers
Shown in the figure are two point charges $+Q$ and $-Q$ inside the cavity of a spherical shell. The charges are kept near the surface of the cavity on opposite sides of the centre of the shell. If $\sigma_1$ is the surface charge on the inner surface and $Q_1$ net charge on it and $\sigma_2$ the surface charge on the outer surface and $Q_2$ net charge on it then : <br>
jeemain
physics
past papers
2015
15
asked
Dec 11, 2018
by
pady_1
0
answers
A thin disc of radius $b=2a$ has a concentric hole of radius $'a'$ in it (see figure). It carries uniform surface charge $'\sigma'$ on it. If the electric field on its axis at height $'h (h<< a)$ from its centre is given as 'Ch' then value of 'C' is : <br>
jeemain
physics
past papers
2015
14
asked
Dec 11, 2018
by
pady_1
0
answers
A bat moving at $10 \;ms^{-1}$ towards a wall sends a sound signal of $8000\; Hz$ towards it. On reflection it hears a sound of frequency f. The value of f in Hz is close to (speed of sound = $320 \;ms^{-1}$ )$
jeemain
physics
past papers
2015
13
asked
Dec 11, 2018
by
pady_1
0
answers
A simple harmonic oscillator of angular frequency $2\; rad\; s^{-1}$ is acted upon by an external force $F = \sin t\; N$. If the oscillator is at rest in its equilibrium position at $t=0$, its position at later times is proportional to :
jeemain
physics
past papers
2015
12
asked
Dec 11, 2018
by
pady_1
0
answers
In an ideal gas at temperature $T$, the average force that a molecule applies on the walls of a closed container depends on $T$ as $T^q$ . A good estimate for $q$ is :
jeemain
physics
past papers
2015
11
asked
Dec 11, 2018
by
pady_1
0
answers
An ideal gas goes through a reversible cycle $a \to b \to c \to d$ has the $V-T$ diagram shown below. Process $d \to a$ and $b \to c$ are adiabatic. <br> <br> The corresponding $P - V$ diagram for the process is (all figures are schematic and not drawn to scale) :
jeemain
physics
past papers
2015
10
asked
Dec 11, 2018
by
pady_1
0
answers
If two glass plates have water between them and are separated by very small distance (see figure), it is very difficult to pull them apart. It is because the water in between forms cylindrical surface on the side that gives rise to lower pressure in the water in comparison to atmosphere. If the radius of the cylindrical surface is R and surface tension of water is T then the pressure in water between the plates is lower by : <br>
jeemain
physics
past papers
2015
9
asked
Dec 11, 2018
by
pady_1
0
answers
If it takes 5 minutes to fill a 15 litre bucket from a water tap of diameter $\frac{2}{\sqrt{\pi}}$ then the Reynolds number for the flow is (density of water $=10^3\; kg/m^3$ and viscosity of water $=10^{-3}$ Pa.s) close to :
jeemain
physics
past papers
2015
8
asked
Dec 11, 2018
by
pady_1
0
answers
A very long (length L) cylindrical galaxy is made of uniformly distributed mass and has radius $R(R << L)$. A star outside the galaxy is orbiting the galaxy in a plane perpendicular to the galaxy and passing through its centre. If the time period of star is T, and its distance from the galaxy's axis is $r$, then :
jeemain
physics
past papers
2015
7
asked
Dec 11, 2018
by
pady_1
0
answers
Consider a thin uniform square sheet made of a rigid material. If its side is $'a'$, mass m and moment of inertia I about one of its diagonals, then :
jeemain
physics
past papers
2015
6
asked
Dec 11, 2018
by
pady_1
0
answers
A uniform solid cylindrical roller of mass $'m'$ is being pulled on a horizontal surface with force $F$ parallel to the surface and applied at its centre. If the acceleration of the cylinder is $'a'$ and it is rolling without slipping then the value of $'F$ is :
jeemain
physics
past papers
2015
5
asked
Dec 11, 2018
by
pady_1
0
answers
A block of mass $m=0.1 \;kg$ is connected to a spring of unknown spring constant $k$. It is compressed to a distance $x$ from its equilibrium position and released from rest. After approaching half the distance$(\frac{x}{2})$ from equilibrium position, it hits another block and comes to rest momentarily, while the other block moves with a velocity $3 \;ms^{-1}$ . The total initial energy of the spring is :
jeemain
physics
past papers
2015
4
asked
Dec 11, 2018
by
pady_1
0
answers
A block of mass $m =10\; kg$ rests on a horizontal table. The coefficient of friction between the block and the table is $0.05$. When hit by a bullet of mass $50\; g$ moving with speed $v$, that gets embedded in it, the block moves and comes to stop after moving a distance of $2\; m$ on the table. If a freely falling object were to acquire speed $\frac{v}{10}$ after being dropped from height $H$, then neglecting energy losses and taking $g=10\; ms^{-2}$ , the value of $H$ is close to :
jeemain
physics
past papers
2015
3
asked
Dec 11, 2018
by
pady_1
0
answers
If a body moving in a circular path maintains constant speed of $10\; ms^{-1}$ , then which of the following correctly describes relation between acceleration and radius ?
jeemain
physics
past papers
2015
2
asked
Dec 11, 2018
by
pady_1
0
answers
$x$ and $y$ displacements of a particle are given as $x(t) = a \sin \omega t$ and $y(t) = a \sin 2 \omega t$. Its trajectory will look like :
jeemain
physics
past papers
2015
1
asked
Dec 11, 2018
by
pady_1
0
answers
Eutrophication of water bodies leading to killing of fishes is mainly due to nonavailability of -
neet
zoology
past papers
2015
74
asked
Aug 21, 2018
by
pady_1
0
answers
A beam of light consisting of red, green and blue colors is incident on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47, respectively. <br> <br> The prism will :
neet
physics
past papers
2015
180
asked
Aug 21, 2018
by
pady_1
1
answer
A photoelectric surface is illuminated successively by monochromatic light of wavelength $\lambda$ and $\frac{\lambda}{2}$ . If the maximum kinetic energy of the emitted photoelectrons in the seconds case is 3 times that in the first case, the work function of the surface of the material is : <br> (h = Planck’s constant, c = speed of light)
neet
physics
past papers
2015
179
asked
Aug 21, 2018
by
pady_1
1
answer
The value of coefficient of volume expansion of glycerin is $5 \times 10^{–4} K^{–1}$. The fractional change in the density of glycerin for a rise of $40^°C$ in its temperature, is :
neet
physics
past papers
2015
178
asked
Aug 21, 2018
by
pady_1
1
answer
In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of the image is I. The magnification of the telescope is :
neet
physics
past papers
2015
177
asked
Aug 21, 2018
by
pady_1
1
answer
Water rises to a height ‘h’ in capillary tube. If the length of capillary tube above the surface of water is made less than ‘h’, then :
neet
physics
past papers
2015
176
asked
Aug 21, 2018
by
pady_1
1
answer
A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be :
neet
physics
past papers
2015
175
asked
Aug 21, 2018
by
pady_1
1
answer
If dimensions of critical velocity $v_c$ of a liquid flowing through a tube are expressed as $[η^x ρ^y r^z]$ , where $η, ρ$ and $r$ are the coefficient of viscosity of liquid, density of liquid and radius of the tube respectively, then the values of $x, y,$ and $z$ are given by :
neet
physics
past papers
2015
174
asked
Aug 21, 2018
by
pady_1
1
answer
The input signal given to a CE amplifier having a voltage gain of 150 is $V_i = 2 \cos ( 15t + \frac{\pi}{3})$. The corresponding output signal will be :
neet
physics
past papers
2015
173
asked
Aug 21, 2018
by
pady_1
1
answer
A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to the field B. If the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is 1MeV, the energy acquired by alpha particle will be :
neet
physics
past papers
2015
172
asked
Aug 21, 2018
by
pady_1
1
answer
Page:
« prev
1
2
3
4
5
...
18
next »
Home
Ask
Tuition
Questions
Practice
Your payment for
is successful.
Continue
...