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Recent questions tagged 46
Questions
In which of the following processes, heat is neither absorbed nor released by a system ?
neet
physics
past papers
2019
46
asked
Jul 8, 2019
by
pady_1
1
answer
The number of $\alpha$ and $\beta$ particles, respectively, emitted in the radioactive decay $ _{90}X^{200} \to _{80}Y^{168}$ are :
jeemain
physics
past papers
1998
46
asked
Dec 19, 2018
by
pady_1
0
answers
In hydrogen spectrum the shortest wavelength in Balmer series is $\lambda$. The shortest wave length in Bracket series will be :
jeemain
physics
past papers
1999
46
asked
Dec 19, 2018
by
pady_1
0
answers
Two metal rods A and B of equal lengths and equal cross-sectional areas are joined end to end. The coefficients of thermal conductivities of A and B are in the ratio 2:3, when the free end of A is maintained at $100^{\circ}C$ and the free end of B is maintained at $0^{\circ}C$, the temperature of the junction is :
jeemain
physics
past papers
2000
46
asked
Dec 19, 2018
by
pady_1
1
answer
The length of an elastic string is $'a'$ metres when the longitudinal tension is 4 N and $'b'$ meters when the longitudinal tension is 5 N. The length of the string in metres when the longitudinal tension is 9 N is :
jeemain
physics
past papers
2001
46
asked
Dec 11, 2018
by
pady_1
0
answers
In a simple harmonic oscillator, at the mean position :
jeemain
physics
past papers
2002
46
asked
Dec 11, 2018
by
pady_1
0
answers
Two identical, photocathodes recieve light of frequencies $f_1$ and $f_2$. If the velocities of the photoelectrons (of mass m) coming out are respecitvely $\nu_1$ and $\nu_2$, then :
jeemain
physics
past papers
2003
46
asked
Dec 11, 2018
by
pady_1
0
answers
Let $a_1, a_2, a_3,.....,a_{49}$ be in A.P. such that $\displaystyle\sum_{k=0}^{12} a_{4k+1}=416$ and $a_9 + a_{43} =66$. <br> If $a_1^2 + a_2^2....a_{17}^2=140\;m$ then $m$ is equal to :
jeemain
math
past papers
2018
46
asked
Dec 11, 2018
by
pady_1
1
answer
Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths $r = \lambda_1/\lambda_2$, is given by : <br>
jeemain
physics
past papers
2017
46
asked
Dec 11, 2018
by
pady_1
0
answers
The pair in which phosphorous atoms have a formal oxidation state of +3 is :
jeemain
chemistry
past papers
2016
46
asked
Dec 11, 2018
by
pady_1
0
answers
The geometry of $XeOF_4$ by VSEPR theory is :
jeemain
chemistry
past papers
2015
46
asked
Dec 11, 2018
by
pady_1
0
answers
et A and B be two events such that $P (\overline{A \cup B}) = \frac{1}{6} , \; P ( A \cap B) = \frac{1}{4} $ and $P(\overline{A}) = \frac{1}{4}$ , where $\overline{A}$ stands for the complement of the event A. Then the events A and B are
jeemain
math
past papers
2014
46
asked
Dec 11, 2018
by
pady_1
1
answer
$\displaystyle{\lim_{x \to 0} \frac{(1 - \cos 2x) ( 3 + \cos x)}{ x \tan 4 x}}$ is equal to
jeemain
math
past papers
2013
46
asked
Dec 11, 2018
by
pady_1
1
answer
This question has statement 1 and statement 2. Of the four choices given after the statements, choose the one that best describes the two statements <br> Statement 1 : Davisson-germer experiment established the wave nature of electrons. <br> Statement 2 : If electrons have wave nature, they can interfere and show diffraction.
jeemain
physics
past papers
2012
46
asked
Dec 11, 2018
by
pady_1
0
answers
Equation of the ellipse whose axes are the axes of coordinates and which passes through the point (-3, 1) and has eccentricity $\sqrt{\frac{2}{5}}$ is
jeemain
math
past papers
2011
46
asked
Dec 11, 2018
by
pady_1
0
answers
If a source of power 4 kW produces $10^{20}$ photons/second, the radiation belong to a part of the spectrum called
jeemain
physics
past papers
2010
46
asked
Dec 11, 2018
by
pady_1
0
answers
Which of the following has as optical isomer ?
jeemain
chemistry
past papers
2009
46
asked
Nov 29, 2018
by
pady_1
0
answers
The equilibrium constants $K_{p_{1}}$ and $K_{p_{2}}$ for the reactions X = 2Y and Z = P + Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressure at these equilibria is
jeemain
chemistry
past papers
2008
46
asked
Nov 29, 2018
by
pady_1
0
answers
A long straight wire of radius $a$ carries a steady current $i$. The current is uniformly distributed across its cross-section. The ratio of the magnetic field at $\frac{a}{2}$ and $2a$ is :
jeemain
physics
past papers
2007
46
asked
Nov 29, 2018
by
pady_1
0
answers
The potential energy of a 1 kg particle free to move along the $x$-axis is given by $V(x) = (\frac{x^4}{4} - \frac{x^2}{2} ) J$ <br> The total mechanical energy of the particle is $2J$. Then, the maximum speed (in m/s) is:
jeemain
physics
past papers
2006
46
asked
Nov 13, 2018
by
pady_1
0
answers
For any vector $\overrightarrow{a}$, the value of $(\overrightarrow{a} \times \hat{i})^2+ (\overrightarrow{a} \times \hat{j})^2 + ( \overrightarrow{a} \times \hat{k})^2$ is equal to :
jeemain
math
past papers
2005
46
asked
Nov 5, 2018
by
pady_1
0
answers
A nuclear transformation is denoted by $X(n, \alpha) \to ^7_3 Li$. Which of the following is the nucleus of element $X$ ?
jeemain
physics
past papers
2005
46
asked
Nov 5, 2018
by
pady_1
0
answers
The equation of the straight line passing through the point $(4, 3)$ and making intercepts on the co-ordinate axes whose sum is $-1$ is
jeemain
math
past papers
2004
46
asked
Nov 5, 2018
by
pady_1
0
answers
Which of the following oxides is most acidic in nature ?
neet
chemistry
past papers
2018
46
asked
Aug 21, 2018
by
pady_1
1
answer
Asymptote in a logistic growth curve is obtained when :
neet
botany
past papers
2017
46
asked
Aug 21, 2018
by
pady_1
1
answer
The two polypeptides of human insulin are linked together by
neet
zoology
past papers
2016
46
asked
Aug 21, 2018
by
pady_1
2
answers
Root pressure develops due to -
neet
botany
past papers
2015
46
asked
Aug 21, 2018
by
pady_1
1
answer
What is the maximum number of orbitals that can be identified with the following quantum number n = 3, $\ell$ = 1, m = 0
neet
chemistry
past papers
2014
46
asked
Aug 20, 2018
by
pady_1
1
answer
The value of Planck's constant is $6.63 \times 10^{-34} Js$. The speed of light is $3 \times 10^{17} nms^{-1}$. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of $6 \times 10^{15} s^{-1}$ ?
neet
chemistry
past papers
2013
46
cbse
class11
ch2
structure-of-atom
asked
Aug 20, 2018
by
pady_1
1
answer
Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is <br>
neet
physics
past papers
2012
46
asked
Aug 20, 2018
by
pady_1
1
answer
A nucleus $_n^m{X}$ emits one α particle and two β– particles. The resulting nucleus is :
neet
physics
past papers
2011
46
asked
Aug 16, 2018
by
pady_1
1
answer
A series combination of $n_1$ capacitors, each of value $C_1$ , is charged by a source of potential difference 4V. When another parallel combination of $n_2$ capacitors, each of value $C_2$, is charged by a source of potential difference V, it is has the same (total) energy stored in it, as the first combination has. The value of $C_2$, in terms of $C_1$, is then –
neet
physics
past papers
2010
46
asked
Jul 26, 2018
by
pady_1
1
answer
The mean free path of electrons in a metal is $4\times10^-8$ m. The electric field which can give on an average 2 eV energy to an electron in the metal will be in units of V/m :
neet
physics
past papers
2009
46
asked
Jul 26, 2018
by
pady_1
1
answer
At 10ºC the value of the density of a fixed mass of an ideal gas divided by its pressure is x. At 110ºC this ratio is -
neet
physics
past papers
2008
46
asked
Jul 26, 2018
by
pady_1
1
answer
The total energy of electron in the ground state of hydrogen atom is -13.6 eV. The kinetic energy of an electron in first excited state is :-
neet
physics
past papers
2007
46
asked
Jul 26, 2018
by
pady_1
2
answers
A square surface of side L metres is in the plane of the paper. A uniform electric field E(volt/m), also in the plane of the paper, is limited only to the lower half of the square surface, (see figure). The electric flux in SI units associated with the surface is:- r E
neet
physics
past papers
2006
46
asked
Jul 25, 2018
by
pady_1
2
answers
Energy levels A, B and C of a certain atom correspond to increasing values of energy i.e. ${E_A}<{E_B}<{E_C}$ . If${\lambda_1},{\lambda_2},{\lambda_3}$ are wave lengths of radiations corresponding to transitions C to B, B to A and C to A respectively, which of the following relations is correct -
neet
physics
past papers
2005
46
asked
Jul 24, 2018
by
pady_1
1
answer
One mole of an ideal gas at an initial temperature of T K does 6 R joules of work adiabatically. If the ratio of specific heats of this gas at consta pressure and at constant volume is $\frac {5} {3}$, the final temperature of gas will be :-
neet
physics
past papers
2004
46
asked
Jul 24, 2018
by
pady_1
2
answers
Barrier potential of a p-n junction diode does not depend on -
neet
physics
past papers
2003
46
asked
Jul 24, 2018
by
pady_1
1
answer
A charge 'q' moves in a region where electric field and magnetic field both exist, then force on it is : -
neet
physics
past papers
2002
46
asked
Jul 23, 2018
by
pady_1
0
answers
250 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m then the load is lifted to 3m, the efficiency of pulley system will be : -
neet
physics
past papers
2001
46
asked
Jul 20, 2018
by
pady_1
2
answers
The life span of atomic hydrogen is :
neet
physics
past papers
2000
46
asked
Jul 20, 2018
by
pady_1
2
answers
The cause of potential barrier in a P–N junction diode is :
neet
physics
past papers
1998
46
asked
Jun 15, 2018
by
pady_1
1
answer
A housekeeper leaves home to visit his customers. He drives 4 kilometres east, 1 kilometre south, 7 kilometres west, 5 kilometres north, and 4 kilometres south. How far and in which direction must the housekeeper go to get back to his home?
class5
math
olympiad
logical
analytical
reasoning
46
asked
Dec 31, 2015
by
pady_1
1
answer
Of the students in Josh's class, 4 have been to Montana and 6 have been to Washington. 3 students have been to both Montana and Washington. How many students have been to Montana or Washington or both?
class5
math
olympiad
data handling
46
asked
Dec 31, 2015
by
pady_1
0
answers
A square lounge has sides that are 9 metres long. What is the lounge's perimeter?
class5
math
olympiad
measurements
46
asked
Dec 31, 2015
by
pady_1
0
answers
Balvinder is reading a mystery novel and this book has 460 pages. Balvinder manages to read $\large\frac{9}{46}$ of the book every day. After 4 days, how many pages does he have left to read?
class5
math
olympiad
fractions
decimals
46
asked
Dec 31, 2015
by
pady_1
1
answer
The denominator of a fraction is 3 more than the numerator. If both the numerator and the denominator are increased by 4, the fraction becomes $\large\frac{4}{5}$ What was the original fraction?
class5
math
olympiad
computation
46
asked
Dec 31, 2015
by
pady_1
0
answers
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