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Recent questions tagged 15
Questions
Which will make basic buffer ?
neet
chemistry
past papers
2019
15
asked
Jul 8, 2019
by
pady_1
1
answer
A satellite is revolving near the earth's surface. Its orbital velocity is :
jeemain
physics
past papers
1998
15
asked
Dec 19, 2018
by
pady_1
0
answers
A car is moving on a circular level road of curvature $300\;m$. If the coefficient of friction is 0.3 and acceleration due to gravity $10\;m/s^2$, the maximum speed that car can have is :
jeemain
physics
past papers
1999
15
asked
Dec 19, 2018
by
pady_1
0
answers
When a metal surface is illuminated by a light of wavelength $400\;nm$ and $250\; nm$. The maximum velocities of the photo electrons ejected are $v$ and $2v$ respectively. The work function of the metal is : (h = Planck's constant, c = velocity of light in air )
jeemain
physics
past papers
2000
15
asked
Dec 19, 2018
by
pady_1
0
answers
In order to double the frequency of the fundamental note emitted by a stretched string, the length is reduced to $\frac{3}{4}^{th}$ of the original length and the tension is changed. The factor by which the tension is to be changed is :
jeemain
physics
past papers
2001
15
asked
Dec 11, 2018
by
pady_1
1
answer
If an electron and proton having same momenta enter perpendicularly to a magnetic field, then :
jeemain
physics
past papers
2002
15
asked
Dec 11, 2018
by
pady_1
0
answers
The time period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time period will become :
jeemain
physics
past papers
2003
15
asked
Dec 11, 2018
by
pady_1
0
answers
A granite rod of 60 cm length is clamped at its middle point and is set into longitudinal vibrations. The density of granite is $2.7 \times 10^3 kg/m^3$ and its Young's modulus is $9.27 \times 10^{10} $ Pa. What will be the fundamental frequency of the longitudinal vibrations?
jeemain
physics
past papers
2018
15
asked
Dec 11, 2018
by
pady_1
0
answers
The distance of the point $(1, 3, -7)$ from the plane passing through the point $(1, -1, -1)$, having normal perpendicular to both the lines $\frac{x-1}{1} = \frac{y+2}{-2} = \frac{z-4}{3}$ and $\frac{x-2}{2} = \frac{y+1}{-1} = \frac{z+7}{-1}$, is
jeemain
math
past papers
2017
15
asked
Dec 11, 2018
by
pady_1
1
answer
Two identical wires A and B, each of length $‘l’$, carry the same current $I$. Wire A is bent into a circle of radius $R$ and wire $B$ is bent to form a square of side $‘a’$. If $B_A$ and $B_B$ are the values of magnetic field at the centres of the circle and square respectively, then the ratio $\frac{B_A}{B_B}$ is :
jeemain
physics
past papers
2016
15
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
In the circuit shown here, the point â€˜Câ€™ is kept connected to point â€˜Aâ€™ till the current flowing through the circuit becomes constant. Afterward, suddenly, point â€˜Câ€™ is disconnected from point â€˜Aâ€™ and connected to point â€˜Bâ€™ at time $t = 0$. Ratio of the voltage across resistance and the inductor at $t = L/R$ will be equal to : <br>
jeemain
physics
past papers
2014
15
asked
Dec 11, 2018
by
pady_1
0
answers
Arrange the following compounds in order of decreasing acidity : <br>
jeemain
chemistry
past papers
2013
15
asked
Dec 11, 2018
by
pady_1
0
answers
The population $p(t)$ at time $t$ of a certain mouse species satisfies the differential equation $\frac{dp(t)}{dt} = 0.5\; p(t) -450$. If $p(0) = 850$, then the time at which the population becomes zero is
jeemain
math
past papers
2012
15
asked
Dec 11, 2018
by
pady_1
0
answers
A mass M, attached to a horizontal spring, executes S.H.M. with amplitude $A_1$. When the mass M passes through its mean position then a smaller mass m is placed over it and both of them move together with amplitude $A_2$. The ratio of $(\frac{A_1}{A_2})$ is :
jeemain
physics
past papers
2011
15
asked
Dec 11, 2018
by
pady_1
0
answers
On mixing, heptane and octane form an ideal solution. At $373\; K$, the vapour pressures of the two liquid components (heptane and octane) are $105\; k\;Pa$ and $45\; k\;Pa$ respectively. Vapour pressure of the solution obtained by mixing $25.0\;g$ of heptane and $35\; g$ of octane will be (molar mass of heptane = $100 g\; mol^{–1}$ an dof octane $= 114\; g\; mol^{–1}).$
jeemain
chemistry
past papers
2010
15
asked
Dec 11, 2018
by
pady_1
0
answers
Two points P and Q are maintained at the potentials of 10V and -4V respectively. The work done in moving 100 electrons from P to Q is
jeemain
physics
past papers
2009
15
asked
Nov 29, 2018
by
pady_1
0
answers
The line passing through the points (5, 1, a) and (3, b, 1) crosses the yz-plane at the point $\bigg[0,\frac{17}{2},\frac{-13}{2}\bigg]$. Then
jeemain
math
past papers
2008
15
asked
Nov 29, 2018
by
pady_1
0
answers
If $ | z+4| \leq 3$, then the maximum value of $|z+1|$ is :
jeemain
math
past papers
2007
15
asked
Nov 29, 2018
by
pady_1
0
answers
A ball of mass 0.2 kg is thrown verticlly upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes upto 2 m height further, find the magnitude of the force, consider $g=10\; m/s^2$ :
jeemain
physics
past papers
2006
15
asked
Nov 13, 2018
by
pady_1
0
answers
If $A = \begin{bmatrix} 1 & 0 \\ 1 & 1 \end{bmatrix}$ and $I = \begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}$, then which one of the following holds for all $n \geq 1$, by the principle of mathematical induction ?
jeemain
math
past papers
2005
15
asked
Nov 5, 2018
by
pady_1
0
answers
A particle of mass $0.3 \;kg$ is subjected to a force $F = -kx$ with $k = 15\; N/m$. What will be its initial acceleration, if it is released from a point 20 cm away from the origin ?
jeemain
physics
past papers
2005
15
asked
Nov 5, 2018
by
pady_1
0
answers
The coefficient of the middle term in the binomial expansion in powers of $(1 + \alpha x)^4$ and of $(1- \alpha x)^6$ is the same if $\alpha$ equals
jeemain
math
past papers
2004
15
asked
Nov 5, 2018
by
pady_1
0
answers
The refractive index of the material of a prism is $\sqrt{2}$ and the angle of the prism is $30^o$. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflecting from the silvered surface) if its angle of incidence on the prism is
neet
physics
past papers
2018
15
asked
Aug 21, 2018
by
pady_1
1
answer
The equilibrium constants of the following are : <br> $N_2 + 3H_2 \rightleftharpoons 2NH_3$ <br> $N_2 + O_2 \rightleftharpoons 2NO$ <br> $H_2 + \frac{1}{2} O_2 \to H_2O$ <br> The equilibrium constant (K) of the reaction : <br> $2NH_3 + \frac{5}{2} O_2 \stackrel{K}\rightleftharpoons 2NO + 3H_2O,$ will be
neet
chemistry
past papers
2017
15
asked
Aug 21, 2018
by
pady_1
1
answer
Match item of Column I with the items of Column II and assign the correct code : <br>
neet
chemistry
past papers
2016
15
asked
Aug 21, 2018
by
pady_1
1
answer
Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified $KMnO_4$ for complete oxidation?
neet
chemistry
past papers
2015
15
asked
Aug 21, 2018
by
pady_1
2
answers
Steam at $100^0 \;C$ is passed into 20g of water at $10^0 \;C$ When water acquires a temperature of $80^0 \;C$, the mass of water present will be: <br> [Take specific heat of water = $1 \; cal\; g^{-10} C^{-1}$ and latent heat of steam = $540 \;cal \;g^{–1} $]
neet
physics
past papers
2014
15
asked
Aug 20, 2018
by
pady_1
1
answer
A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using -
neet
physics
past papers
2013
15
asked
Aug 20, 2018
by
pady_1
1
answer
Two sources of sound placed close to each other, are emitting progressive waves given by $y_1 = 4 sin 600 \pi t $ and $y_2 = 5 sin 608 \pi t$
neet
physics
past papers
2012
15
asked
Aug 20, 2018
by
pady_1
1
answer
A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will :
neet
physics
past papers
2011
15
asked
Aug 16, 2018
by
pady_1
1
answer
An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 /s. The mass per unit length of water in the pipe is 100 kg/m. What is the power of the engine –
neet
physics
past papers
2010
15
asked
Jul 26, 2018
by
pady_1
1
answer
The two ends of a rod of length L and a uniform cross-sectional area A are kept at two temperatures $T_1$ and $T_2$ $(T_1>T_2)$. The rate of heat transfer, $\frac{dQ}{dt}$ through the rod in a steady dt state is given by :
neet
physics
past papers
2009
15
asked
Jul 26, 2018
by
pady_1
1
answer
If the error in the measurement of radius of a sphere is 2 % then the error in the determination of volume of the sphere will be -
neet
physics
past papers
2008
15
asked
Jul 26, 2018
by
pady_1
1
answer
An engine has an efficiency of $1/6$. When the temperature of sink is reduced by $62^{\circ}C$, its efficiency is doubled. Temperature of the source is-
neet
physics
past papers
2007
15
asked
Jul 26, 2018
by
pady_1
1
answer
A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation $S=\frac{ 1}{ 3}{t^2}$ , where t is in seconds. Work done by the force in 2 seconds is:-
neet
physics
past papers
2006
15
asked
Jul 25, 2018
by
pady_1
1
answer
A particle executing simple harmonic motion of amplitude 5 cm has maximum speed of 31.4 cm/s. The frequency of its oscillation is :
neet
physics
past papers
2005
15
asked
Jul 24, 2018
by
pady_1
1
answer
In semiconductors at a room temperature
neet
physics
past papers
2004
15
asked
Jul 24, 2018
by
pady_1
1
answer
An observer moves towards a stationary source of sound with a speed $1/5^{th}$ of the speed of sound. The wavelength and frequency of the source emitted are $\lambda$ and $f$ respectively. The apparent frequency and wavelength recorded by the observer are respectively :
neet
physics
past papers
2003
15
asked
Jul 24, 2018
by
pady_1
1
answer
A bulb is located on a wall. Its image is to be obtained on a parallel wall with the help of convex lens. If the distance between parallel walls is 'd' then required focal length of lens placed in between the walls is : -
neet
physics
past papers
2002
15
asked
Jul 23, 2018
by
pady_1
1
answer
Half life of radioactive element is 12.5 Hour and its quantity is 256 gm. After how much time its quantity will remain 1 gm : -
neet
physics
past papers
2001
15
asked
Jul 20, 2018
by
pady_1
2
answers
Maximum frequency of emission is obtained for the transition :
neet
physics
past papers
2000
15
asked
Jul 20, 2018
by
pady_1
0
answers
The speed of a boat is $5\; km/hr$ is still water. It crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of river water is :
neet
physics
past papers
1998
15
asked
Jun 15, 2018
by
pady_1
1
answer
Archana is standing in a row. If she is 12th from the front and 19th from the back, how may people are standing in the row ?
class5
math
olympiad
logical
analytical
reasoning
15
asked
Dec 31, 2015
by
pady_1
1
answer
A new cookbook is becoming popular. The local bookstore ordered 7 copies in June, 14 copies in July, 21 copies in August, and 28 copies in September. If this pattern continues, how many copies will the bookstore order in October?
class5
math
olympiad
data handling
15
asked
Dec 31, 2015
by
pady_1
0
answers
Find the area of a square of side 21 m.
class5
math
olympiad
measurements
15
asked
Dec 31, 2015
by
pady_1
0
answers
$4\large\frac{1}{3} \times 2\large\frac{1}{5}$
class5
math
olympiad
fractions
decimals
15
asked
Dec 31, 2015
by
pady_1
0
answers
If 10 Kgs. of corn is required to make food for 350 people, then how many kilograms will be needed to make food for 2380 people?
class5
math
olympiad
computation
15
asked
Dec 31, 2015
by
pady_1
0
answers
The maximum distance up to which TV transmission from a TV tower of height h can be received is
jeemain
aipmt
physics
cbse
class12
ch
15
communication-systemsbandwidth-of-signals-and-transmission-medium
easy
asked
Feb 25, 2014
by
thanvigandhi_1
1
answer
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