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Recent questions tagged 48
Questions
The total energy of an electron in an atom in an orbit is -3.4 eV. Its kinetic and potential energies are, respectively :
neet
physics
past papers
2019
48
asked
Jul 8, 2019
by
pady_1
1
answer
In the carbon cycle of fusion :
jeemain
physics
past papers
1998
48
asked
Dec 19, 2018
by
pady_1
0
answers
In intrisic semiconductors :
jeemain
physics
past papers
1999
48
asked
Dec 19, 2018
by
pady_1
0
answers
If vibrating tuning fork of frequency $255 \;Hz$ is moving wih a velocity $4\;ms^{-1}$ towards the wall the number of beat heard per second is (speed of sound in air = $340\;ms^{-1}$) :
jeemain
physics
past papers
2000
48
asked
Dec 19, 2018
by
pady_1
0
answers
Water is conveyed through a uniform tube of 8 cm in diameter and 3140 m in length at the rate $2 \times 10^{-3} m^3$ per second. The pressure required in maintain the flow is : <br> (Viscosity of water = $10^{-3}$ SI units )
jeemain
physics
past papers
2001
48
asked
Dec 11, 2018
by
pady_1
0
answers
The minimum velocity (in $ms^{-1})$ with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is :
jeemain
physics
past papers
2002
48
asked
Dec 11, 2018
by
pady_1
0
answers
A 3V battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I, in the circuit will be : <br>
jeemain
physics
past papers
2003
48
asked
Dec 11, 2018
by
pady_1
0
answers
The value of $\begin{align*} \int_{-\frac{\pi}{2}}^{\frac{\pi}{2}} \frac{\sin^2 x}{1+2^x} dx \end{align*}$ is :
jeemain
math
past papers
2018
48
asked
Dec 11, 2018
by
pady_1
1
answer
A body is thrown vertically upwards. Which one of the following graphs correctly represent the velocity vs time ?
jeemain
physics
past papers
2017
48
asked
Dec 11, 2018
by
pady_1
0
answers
The pair having the same magnetic moment is : <br> [At. No : Cr = 24, Mn = 25, Fe = 26, Co = 27]
jeemain
chemistry
past papers
2016
48
asked
Dec 11, 2018
by
pady_1
0
answers
Which molecule/ion among the following cannot act as a ligand in complex compounds ?
jeemain
chemistry
past papers
2015
48
asked
Dec 11, 2018
by
pady_1
0
answers
Let the population of rabbits surviving at a time t be governed by the differential equation $\frac{dp(t)}{dt} = \frac{1}{2} p(t) - 200$ . If $p(0) = 100$, then $p(t)$ equals
jeemain
math
past papers
2014
48
asked
Dec 11, 2018
by
pady_1
1
answer
At present, a firm is manufacturing 2000 items. It is estimated that the rate of change of production P w.r.t. additional number of workers $x$ is given by $\frac{dP}{dx} = 100 - 12\sqrt{x}$. If the firm employs 25 more workers, then the new level of production of items is
jeemain
math
past papers
2013
48
asked
Dec 11, 2018
by
pady_1
1
answer
A charge Q is uniformly distributed over the surface of non conducting disc of radius R. The disc rotates about an axis perpendicular to its plane and passing through its centre with an angular velocity $\omega$. As a result of this rotation a magnetic field of induction B is obtained at the centre of the disc. If we keep both the amount of charge placed on the disc and its angular velocity of be constant and vary the radius of the disc then the variation of the magnetic induction at the centre of the disc will be represented by the figure
jeemain
physics
past papers
2012
48
asked
Dec 11, 2018
by
pady_1
0
answers
The vector $\overrightarrow{a}$ and $\overrightarrow{b}$ are not perpendicular and $\overrightarrow{c}$ and $\overrightarrow{d}$ are two vectors satisfying : $\overrightarrow{b} \times \overrightarrow{c} = \overrightarrow{b} \times \overrightarrow{d}$ and $\overrightarrow{a}.\overrightarrow{d} =0$. Then the vector $\overrightarrow{d}$ is equal to
jeemain
math
past papers
2011
48
asked
Dec 11, 2018
by
pady_1
0
answers
In a series LCR circuit $R = 200 \Omega$ and the voltage and the frequency of the main supply is 220 V and 50 Hz respectively. On taking out the capacitance from the circuit the current lags behind the voltage by $30^{\circ}$. On taking out the inductor from the circuit leads the voltage by $30^{\circ}$. The power dissipiated in the LCR circuit is
jeemain
physics
past papers
2010
48
asked
Dec 11, 2018
by
pady_1
0
answers
Which one of the following reactions of Xenon compounds is not feasible ?
jeemain
chemistry
past papers
2009
48
asked
Nov 29, 2018
by
pady_1
0
answers
Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?
jeemain
chemistry
past papers
2008
48
asked
Nov 29, 2018
by
pady_1
0
answers
If $M_o$ is the mass of an oxygen isotope $_8O^{17}, M_p$ and $M_n$ are the masses of a proton and a neutron respectively, the nuclear binding energy of the isotope is :
jeemain
physics
past papers
2007
48
asked
Nov 29, 2018
by
pady_1
0
answers
A wire elongates by $l\; mm$ when a load $W$ is hanged from it. If the wire goes over a pulley and two weights $W $ each are hung at the two ends, the elongation of the wire will be (in mm) :
jeemain
physics
past papers
2006
48
asked
Nov 13, 2018
by
pady_1
0
answers
If a vertex of a triangle is (1, 1) and the mid points of two sides through this vertex are (-1, 2) and (3, 2), then the centroid of a triangle is :
jeemain
math
past papers
2005
48
asked
Nov 5, 2018
by
pady_1
0
answers
Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge $q$ flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are $z_1$ and $z_2$ respectively, the charge which flows through the silver voltameter is :
jeemain
physics
past papers
2005
48
asked
Nov 5, 2018
by
pady_1
0
answers
If one of the lines given by $6x^2-xy+4cy^2=0$ is $3x+4y=0$, then $c$ equals
jeemain
math
past papers
2004
48
asked
Nov 5, 2018
by
pady_1
0
answers
A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. $H_2SO_4$. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP wil be
neet
chemistry
past papers
2018
48
asked
Aug 21, 2018
by
pady_1
1
answer
In case of poriferans, the spongocoel is lined with flagellated cells called :
neet
zoology
past papers
2017
48
asked
Aug 21, 2018
by
pady_1
1
answer
Which of the following is not a feature of the plasmids ?
neet
botany
past papers
2016
48
asked
Aug 21, 2018
by
pady_1
1
answer
Which of the following structures is not found in a prokaryotic cell ?
neet
botany
past papers
2015
48
asked
Aug 21, 2018
by
pady_1
1
answer
Equal masses of $H_2, O_2$ and methane have been taken in a container of volume V at temperature $27^oC$ in identical conditions. The ratio of the volumes of gases $H_2: O_2: methane$ would be -
neet
chemistry
past papers
2014
48
asked
Aug 20, 2018
by
pady_1
1
answer
What is the activation energy for a reaction if its rate doubles when the temperature is raised from $20^oC$ to $35^oC$ ? <br> (R = 8.314 $J mol^{-1} K^{-1}$)
neet
chemistry
past papers
2013
48
asked
Aug 20, 2018
by
pady_1
2
answers
In a CE transistor amplifier, the audio singal voltage across the collector resistance of $2k\Omega$ is 2V. If the v base resistance is $1 k\Omega$ and the current amplification of the transistor is 100, the input signal voltage is
neet
physics
past papers
2012
48
asked
Aug 20, 2018
by
pady_1
1
answer
If a small amount of antimony is added to germanium crystal :
neet
physics
past papers
2011
48
asked
Aug 16, 2018
by
pady_1
1
answer
A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the ? loop. If the force on one arm of the loop is $\overrightarrow{F}$ , the net force on the remaining three arms of the loop is –
neet
physics
past papers
2010
48
asked
Jul 26, 2018
by
pady_1
1
answer
A p–n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength :
neet
physics
past papers
2009
48
asked
Jul 26, 2018
by
pady_1
1
answer
A circular disc of radius 0.2 metre is placed in uniform magnetic field of induction $\frac{1}{\pi}[\frac{Wb}{m^2}]$ in such a way that its axis makes an angle of $60^o$ with $\overrightarrow{B}$ . The magnetic flux linked with the disc is -
neet
physics
past papers
2008
48
asked
Jul 26, 2018
by
pady_1
2
answers
A common emitter amplifier has voltage gain of 50, an input impedance of 100 $\Omega$ and an output impedance of 200 $\Omega$. The power gain of the amplifier is :-
neet
physics
past papers
2007
48
asked
Jul 26, 2018
by
pady_1
1
answer
A uniform rod of length l and mass m is free to rotate in a vertical plane about A. The rod initially in horizontal position is released. The initial angular acceleration of the rod is (Moment of inertia of rod about A is $\frac{ ml^2}{3}$ ):
neet
physics
past papers
2006
48
asked
Jul 25, 2018
by
pady_1
1
answer
Two boys are standing at the ends A and B of a ground where AB = a. The boy at B starts. running in a direction perpendicular to AB with velocity v1. The boy at A starts running simultaneously with velocity v and catches the other boy in a time t, where t is -
neet
physics
past papers
2005
48
asked
Jul 24, 2018
by
pady_1
1
answer
Five equal resistances each of resistance R are connected as shown in the Figure. A battery of V volts is connected between A and B. The current flowing in AFCEB will be <br>
neet
physics
past papers
2004
48
asked
Jul 24, 2018
by
pady_1
1
answer
The mass number of a nucleus is
neet
physics
past papers
2003
48
asked
Jul 24, 2018
by
pady_1
1
answer
The velocity of electromagnetic wave is parallel to : -
neet
physics
past papers
2002
48
asked
Jul 23, 2018
by
pady_1
1
answer
$M_n$ and $M_p$ represet the mass of neutron and proton respectively. An element having mass M has N neutron and Z-protons, then the correct relation will be : -
neet
physics
past papers
2001
48
asked
Jul 20, 2018
by
pady_1
1
answer
When an electron do transition from n = 4 to n = 2, then emitted line in spectrum will be :
neet
physics
past papers
2000
48
asked
Jul 20, 2018
by
pady_1
1
answer
We consider a thermodynamic system. If $\Delta$U represents the increase in its internal energy and W the work done by the system, which of the following statements is true ?
neet
physics
past papers
1998
48
asked
Jun 15, 2018
by
pady_1
1
answer
Lucy leaves school on a motorcycle. She rides 1 block east, 5 blocks north, 10 blocks south, 5 blocks west, and 5 blocks north. How far and in which direction must Lucy go to get back to her school?
class5
math
olympiad
logical
analytical
reasoning
48
asked
Dec 31, 2015
by
pady_1
1
answer
Of the students in Belle's grade, 9 like to eat crisps and 7 like to eat cheeseburgers. 4 students like to eat both crisps and cheeseburgers. How many students like to eat crisps or cheeseburgers or both?
class5
math
olympiad
data handling
48
asked
Dec 31, 2015
by
pady_1
0
answers
A soccer field is 113 metres long and 62 metres wide. What is its perimeter?
class5
math
olympiad
measurements
48
asked
Dec 31, 2015
by
pady_1
0
answers
Convert $9 \large\frac{5}{8}$ to improper fraction.
class5
math
olympiad
fractions
decimals
48
asked
Dec 31, 2015
by
pady_1
0
answers
A mobile phone company has 6,058 customers in India and 741 customers in other countries. In total, how many customers does it have?
class5
math
olympiad
computation
48
asked
Dec 31, 2015
by
pady_1
0
answers
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