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Recent questions tagged 29
Questions
The correct structure of tribromooctaoxide is :-
neet
chemistry
past papers
2019
29
asked
Jul 10, 2019
by
pady_1
2
answers
An object is placed 40 cm in front of a convex mirror of radius of curvature 20 cm. The image :
jeemain
physics
past papers
1998
29
asked
Dec 19, 2018
by
pady_1
0
answers
In a medium, in which a transverse progressive wave is travelling to the phase difference between two points with a distance of separation is $1.25\;cm$ is $\frac{\pi}{4}$. If the frequency of wave is $1000\;Hz$, its velocity will be :
jeemain
physics
past papers
1999
29
asked
Dec 19, 2018
by
pady_1
0
answers
A ball is projected vertically down with an initial velocity from a height of 20 m on to a horizontal floor. During the impact it losses 50% of the energy and rebounds to the same height, the initial velocity of its projection is :
jeemain
physics
past papers
2000
29
asked
Dec 19, 2018
by
pady_1
0
answers
A heavy nucleus at rest breaks into two fragments which fly off with velocities in the ratio $3:1$. The ratio of radii of the fragments is :
jeemain
physics
past papers
2001
29
asked
Dec 11, 2018
by
pady_1
0
answers
Identify the pair whose dimension are equal :
jeemain
physics
past papers
2002
29
cbse11
ch1
units-and-measurement
asked
Dec 11, 2018
by
pady_1
1
answer
Consider the following two statements :<br> A. Linear momentum of a system of particles is zero. <br> B. Kinetic energy of a system of particle is zero. <br> Then :
jeemain
physics
past papers
2003
29
asked
Dec 11, 2018
by
pady_1
0
answers
Two moles of an ideal monoatomic gas occupies a volume $V$ at $27^{\circ}C$. The gas expands adiabatically to a volume $2V$. Calculate (a) the final temperature of the gas and (b) change in its internal energy. <br>
jeemain
physics
past papers
2018
29
asked
Dec 11, 2018
by
pady_1
0
answers
If, for a positive integer n, the quadratic equation, $x(x + 1) + (x + 1)(x + 2) +.....+ (x + \overline{n – 1})(x + n) = 10n$ has two consecutive integral solutions, then n is equal to
jeemain
math
past papers
2017
29
asked
Dec 11, 2018
by
pady_1
1
answer
Identify the semiconductor devices whose characteristics are given below, in the order (a), (b), (c), (d) : <br>
jeemain
physics
past papers
2016
29
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
Two beams, A and B, of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam A has maximum intensity (and beam B has zero intensity), a rotation of Polaroid through $30^{\circ}$ makes the two beams appear equally bright. If the initial intensities of the two beams are $I_A$ and $I_B$ respectively, then $I_A/I_B$ equals :
jeemain
physics
past papers
2014
29
asked
Dec 11, 2018
by
pady_1
0
answers
An organic compound A upon reacting with $NH_3$ gives B. On heating B gives C. C in presence of KOH reacts with $Br_2$ to give $CH_3CH_2NH_2$. A is
jeemain
chemistry
past papers
2013
29
asked
Dec 11, 2018
by
pady_1
0
answers
A line is drawn through the point (1, 2) to meet the coordinate axes at P and Q such that it forms a triangle OPQ, where O is the origin. If the area of the triangle OPQ is least, then the slope of the line PQ is
jeemain
math
past papers
2012
29
asked
Dec 11, 2018
by
pady_1
0
answers
The half life of a radioactive substance is 20 minutes. The aproximate time interval $(t_2 - t_1)$ between the time $t_2$ when $\frac{2}{3}$ of it has decayed and time $t_1$ and $\frac{1}{3}$ of it had decayed is :
jeemain
physics
past papers
2011
29
asked
Dec 11, 2018
by
pady_1
0
answers
The polymer containing strong intermolecular forces e.g. hydrogen bonding,
jeemain
chemistry
past papers
2010
29
asked
Dec 11, 2018
by
pady_1
0
answers
The work done on the gas in taking it from D to A is
jeemain
physics
past papers
2009
29
asked
Nov 29, 2018
by
pady_1
0
answers
$Let I ={\displaystyle\int^1_0\frac{sin{x}}{\sqrt{x}}dx}$ and $ J={\displaystyle\int^1_0\frac{cos{x}}{\sqrt{x}}dx}$. Then which one of the following is true?
jeemain
math
past papers
2008
29
asked
Nov 29, 2018
by
pady_1
0
answers
If (2, 3, 5) is one end of a diameter of the sphere $x^2 + y^2 + z^2 - 6x - 12 y - 2 z + 20 = 0 $, then the coordinates of the other end of the diameter are :
jeemain
math
past papers
2007
29
asked
Nov 29, 2018
by
pady_1
0
answers
Two insulating plates are both uniformly charged in such a way that the potential difference between them is $V_2 -V_1 = 20 V$.(i.e, plate 2 is at a higher potential). The plates are separated by $d=0.1 \;m$ and can be treated as infinitely large. An electron is released from rest on the inner surface of plate 1. What is its speed when it hits plate 2 ? <br> ($e = 1.6 \times 10^{-19} C, m_0 = 9.11 \times 10^{-31} kg$) <br>
jeemain
physics
past papers
2006
29
asked
Nov 13, 2018
by
pady_1
0
answers
In a triangle ABC, let $\angle{C} = \pi / 2$, if $r$ is the inradius and $R$ is the circumradius of the triangle ABC, then $2(r+R)$ equals :
jeemain
math
past papers
2005
29
asked
Nov 5, 2018
by
pady_1
0
answers
The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm, is incident on it. The band gap in (eV) for the semiconductor is :
jeemain
physics
past papers
2005
29
asked
Nov 5, 2018
by
pady_1
0
answers
Let $f(x) = \frac{1- \tan x}{4x - \pi}, \; x \neq \frac{\pi}{4} , \; x \in [0, \frac{\pi}{2}]$. If $f(x)$ is continuous in $[0, \frac{\pi}{2}]$, then $f(\frac{\pi}{4})$ is
jeemain
math
past papers
2004
29
asked
Nov 5, 2018
by
pady_1
0
answers
If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct ?
neet
physics
past papers
2018
29
asked
Aug 21, 2018
by
pady_1
1
answer
Machanism of a hypothetical reaction $X_2 + Y_2 \to 2XY$ is given below. <br> (i) $X_2 \to X + X (fast)$<br> (ii) $X + Y_2 \rightleftharpoons XY + Y (slow)$ <br> (iii) $X + Y \to XY (fast) $ <br> The overall order of the reaction will be -
neet
chemistry
past papers
2017
29
asked
Aug 21, 2018
by
pady_1
1
answer
Lithium has a bcc structure. Its density is $530\; kg\; m^{–3}$ and its atomic mass is $6.94\; g \;mol^{–1}$. Calculate the edge length of a unit cell of Lithium metal. (NA = $6.02 \times 10^{23} mol^{–1}$)
neet
chemistry
past papers
2016
29
asked
Aug 21, 2018
by
pady_1
1
answer
Two possible stero-structuers of $CH_3CHOH.COOH$, which are optically active, are called :
neet
chemistry
past papers
2015
29
asked
Aug 21, 2018
by
pady_1
1
answer
Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole $\overrightarrow{m}$ . Which configuration has highest net magnetic dipole moment?
neet
physics
past papers
2014
29
asked
Aug 20, 2018
by
pady_1
1
answer
A current loop in a magnetic field -
neet
physics
past papers
2013
29
asked
Aug 20, 2018
by
pady_1
1
answer
An electric dipole of moment 'p' is placed in an electric field of intensity 'E'. The dipole acquires a position such that the axis of the dipole makes an angle $\theta$ with the direction of the field.Assuming that the potential energy of the dipole to be zero when $\theta = 90º$, the torque and the potential energy of thedipole will respectively be
neet
physics
past papers
2012
29
asked
Aug 20, 2018
by
pady_1
1
answer
When 1 kg of ice at $0^oC$ melts to water at $0^oC$, the resulting change in its entropy, taking latent heat of ice to be $80 \; Cal/gm$ is :
neet
physics
past papers
2011
29
asked
Aug 16, 2018
by
pady_1
1
answer
Which of the following statement is false for the properties of electromagnetic 2 waves ?
neet
physics
past papers
2010
29
asked
Jul 26, 2018
by
pady_1
1
answer
A conducting circular loop is placed in a uniform magnetic field 0.04T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm/s. The induced emf in the loop when the redius is 2 cm is :
neet
physics
past papers
2009
29
asked
Jul 26, 2018
by
pady_1
1
answer
The energy required to charge a parallel plate condenser of plate separation d and plate area of cross-section A such that the uniform electric field between the plates is E, is :
neet
physics
past papers
2008
29
asked
Jul 26, 2018
by
pady_1
1
answer
If the cold junction of a thermo-couple is kept at $0^{\circ}C$ and the hot junction is kept at $T^{\circ}C$, then the relation between neutral temperature $(T_n)$ and temperature of inversion $(T_i)$ is:
neet
physics
past papers
2007
29
asked
Jul 26, 2018
by
pady_1
1
answer
A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of 30Âº with the wall. It is reflected with the same speed and at the same angle. If the ball is in contact with the wall for 0.25 seconds, the average force acting on the wall is:- <br>
neet
physics
past papers
2006
29
asked
Jul 25, 2018
by
pady_1
1
answer
Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54Å. The value of lattice constant for this lattice is-
neet
physics
past papers
2005
29
asked
Jul 24, 2018
by
pady_1
1
answer
A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in t the ratio of-
neet
physics
past papers
2004
29
asked
Jul 24, 2018
by
pady_1
1
answer
Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be :
neet
physics
past papers
2003
29
asked
Jul 24, 2018
by
pady_1
1
answer
A rod of length is 3m and its mass acting per unit length is driectly proportional to distance x from one of its end then its centre of gravity from th end will be at : -
neet
physics
past papers
2002
29
asked
Jul 23, 2018
by
pady_1
1
answer
Energy per unit volume for a capacitor having area A and separation d kept at potential difference V is given by :-
neet
physics
past papers
2001
29
asked
Jul 20, 2018
by
pady_1
1
answer
The relation between $\lambda$ and $T_\frac{1}{2}$ is : ( $T_\frac{1}{2}$= half life , $\lambda\rightarrow decay constant$ )
neet
physics
past papers
2000
29
asked
Jul 20, 2018
by
pady_1
1
answer
A gas of volume changes 2 litre to 10 litre at constant temperature 300K, then the change in internal energy will be :
neet
physics
past papers
1998
29
asked
Jun 15, 2018
by
pady_1
1
answer
Brooke bought 5 packs of white T-shirts and 2 packs of blue T-shirts for her basketball team. The white T-shirts come in packs of 9, and the blue T-shirts come in packs of 6. How many T-shirts did Brooke buy in all?
class5
math
olympiad
logical
analytical
reasoning
29
asked
Dec 31, 2015
by
pady_1
1
answer
Brenna is planting flowers in her garden. She plants 2 flowers in the first row, 6 flowers in the second row, 18 flowers in the third row, and 54 flowers in the fourth row. If this pattern continues, how many flowers will Brenna plant in the fifth row?
class5
math
olympiad
data handling
29
asked
Dec 31, 2015
by
pady_1
0
answers
John bought 27.5 m of cloth. How many cm of cloth did he buy?
class5
math
olympiad
measurements
29
asked
Dec 31, 2015
by
pady_1
1
answer
$6 \large\frac{2}{3} \div 4\large\frac{1}{5}$
class5
math
olympiad
fractions
decimals
29
asked
Dec 31, 2015
by
pady_1
0
answers
If 95 \% of the students are present in a school and the number of absent students is 25, find the total number of students in the school?
class5
math
olympiad
computation
29
asked
Dec 31, 2015
by
pady_1
0
answers
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