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Recent questions tagged 43
Questions
For the chemical reaction $N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)$ the correct option is :
neet
chemistry
past papers
2019
43
asked
Jul 8, 2019
by
pady_1
1
answer
The radius of the Bohr orbit depends on $n$ as :
jeemain
physics
past papers
1998
43
asked
Dec 19, 2018
by
pady_1
0
answers
When two infinitely long parallel wires separated by a distance of 1 m, each carry a current of 3 A, the force in $N/m$ length experienced by each will be given $\mu_0 = 4 \pi \times 10^{-7}$ SI units :
jeemain
physics
past papers
1999
43
asked
Dec 19, 2018
by
pady_1
0
answers
A flask is filled with $1.3\;g$ of an ideal gas at $27^{\circ}C$ and its temperature is raised to $52^{\circ}C$. The mass of the gas that has to be released to maintain the temperature of the released to maintain the temperature of the gas in the flask at $52^{\circ}C$ and the pressure remaining the same is :
jeemain
physics
past papers
2000
43
asked
Dec 19, 2018
by
pady_1
0
answers
Mass $M$ is divided into two parts $''xm''$ and $''(1-x)m''$. For a given separation the value of $x$ for which the gravitational attraction between the two pieces becomes maximum is :
jeemain
physics
past papers
2001
43
asked
Dec 11, 2018
by
pady_1
0
answers
If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should :
jeemain
physics
past papers
2002
43
asked
Dec 11, 2018
by
pady_1
0
answers
Let $\overrightarrow{F}$ be the force acting on a particle having position vector $\overrightarrow{r}$ and $\overrightarrow{\tau}$ be the torque of this force about the origin. Then :
jeemain
physics
past papers
2003
43
asked
Dec 11, 2018
by
pady_1
0
answers
Tangent and normal are drawn at $P(16, 16)$ on the parabola $y^2 =16x$, which intersect the axis of the parabola at A and B, respectively. If $C$ is the centre of the circle through the points $P, \;A$ and $B$ and $\angle CPB=\theta$, then a value of $\tan \theta$ is :
jeemain
math
past papers
2018
43
asked
Dec 11, 2018
by
pady_1
1
answer
An electric dipole has a fixed dipole moment $\overrightarrow{p}$, which makes angle $\theta$ with respect to x-axis. When subjected to an electric field $\overrightarrow{E_1} = E \hat{i}$, it experiences a torque $\overrightarrow{T_1} = \tau \hat{k}$. When subjected to another electric field $\overrightarrow{E_2} = \sqrt{3} E_1 \hat{j}$ it experiences a torque $\overrightarrow{T_2} = - \overrightarrow{T_1}$. The angle $\theta$ is :
jeemain
physics
past papers
2017
43
asked
Dec 11, 2018
by
pady_1
0
answers
Which one of the following statements about water is FALSE ?
jeemain
chemistry
past papers
2016
43
asked
Dec 11, 2018
by
pady_1
0
answers
Permanent hardness in water cannot be cured by :
jeemain
chemistry
past papers
2015
43
asked
Dec 11, 2018
by
pady_1
1
answer
If $\alpha, \beta \neq 0$, and $f(n) = \alpha^n + \beta^n$ and $ \begin{vmatrix} 3 & 1+f(1) & 1+f(2) \\ 1+f(1) & 1+f(2) & 1+f(3) \\ 1+f(2) & 1+f(3) &1+f(4) \end{vmatrix} = K(1 - \alpha)^2 (1 - \beta)^2 (\alpha - \beta)^2$, then $K$ is equal to
jeemain
math
past papers
2014
43
asked
Dec 11, 2018
by
pady_1
1
answer
The area (in square units) bounded by the curves $y = \sqrt{x}, 2y - x + 3 = 0$, x-axis, and lying in the first quadrant is
jeemain
math
past papers
2013
43
asked
Dec 11, 2018
by
pady_1
1
answer
Two electric bulbs marked 25 W - 220 V and 100 W - 220 V are connected in series to a 440 V supply. Which of the bulbs will fuse ?
jeemain
physics
past papers
2012
43
asked
Dec 11, 2018
by
pady_1
0
answers
The domain of the function $f(x) = \frac{1}{\sqrt{|x|-x}}$ is
jeemain
math
past papers
2011
43
asked
Dec 11, 2018
by
pady_1
0
answers
A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field E at the centre O is
jeemain
physics
past papers
2010
43
asked
Dec 11, 2018
by
pady_1
0
answers
Given : $E^o_{Fe^{3+}/Fe} = - 0.036V,$ $E^o_{Fe^{2+}/Fe} = -0.439\; V$. The value of standard electrode potential for the change, $Fe^{3+}_{(aq)} + e^- \to Fe^{2+} (aq)$ will be :
jeemain
chemistry
past papers
2009
43
asked
Nov 29, 2018
by
pady_1
0
answers
In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of $\triangle_o$ be the highest?
jeemain
chemistry
past papers
2008
43
asked
Nov 29, 2018
by
pady_1
0
answers
An electric charge $10^{-3} \mu C$ is placed at the origin (0, 0) of X-Y coordinate system. Two points A and B are situated at $(\sqrt{2}, \sqrt{2})$ and $(2, 0)$ respectively. The potential difference between the points A and B will be :
jeemain
physics
past papers
2007
43
asked
Nov 29, 2018
by
pady_1
0
answers
A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency $\omega$. The amplitude of oscillation is gradually increased. The coin will leave contact with the platform for the first time:
jeemain
physics
past papers
2006
43
asked
Nov 13, 2018
by
pady_1
0
answers
The parabolas $y^2 = 4x$ and $x^2 = 4y$ divide the square region bounded by the lines $x = 4, y = 4$ and the co-ordinate axes. If $S_1, S_2, S_3$ are respectively the areas of these parts numbered from top to bottom, then $S_1 : S_2 : S_3$ is :
jeemain
math
past papers
2005
43
asked
Nov 5, 2018
by
pady_1
0
answers
If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor :
jeemain
physics
past papers
2005
43
asked
Nov 5, 2018
by
pady_1
0
answers
The differential equation for the family of curves $x^2 + y^2 - 2ay = 0$, where $a$ is an arbitary constant is
jeemain
math
past papers
2004
43
asked
Nov 5, 2018
by
pady_1
0
answers
For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is
neet
physics
past papers
2018
43
asked
Aug 21, 2018
by
pady_1
1
answer
If molality of the dilute solution is doubled, the value of molal depression constant $(K_f)$ will be
neet
chemistry
past papers
2017
43
asked
Aug 21, 2018
by
pady_1
1
answer
Which of the following statements is false ?
neet
chemistry
past papers
2016
43
asked
Aug 21, 2018
by
pady_1
1
answer
Which of the following reaction(s) can be used for the preparation of alkyl halides ? <br> (I) $CH_3CH_2OH + HCl \xrightarrow{anh. ZnCl_2}$ <br> (II) $CH_3CH_2OH + HCl \to $ <BR> (III) $(CH_3)_3COH + HCl \to $ <br> (IV) $(CH_3)_2 CHOH + HCl \xrightarrow{anh. ZnCl_2}$
neet
chemistry
past papers
2015
43
asked
Aug 21, 2018
by
pady_1
1
answer
A radio isotope 'X' with a half life $1.4 \times 10^9$ years decays to 'Y' which is stable. A sample of the rock from a cave was found to contain 'X' and 'Y' in the ratio 1 : 7. The age of the rock is :
neet
physics
past papers
2014
43
asked
Aug 20, 2018
by
pady_1
1
answer
In a n-type semiconductor, which of the following statements is true -
neet
physics
past papers
2013
43
asked
Aug 20, 2018
by
pady_1
1
answer
An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be
neet
physics
past papers
2012
43
asked
Aug 20, 2018
by
pady_1
1
answer
The half life of radioactive isotope 'X' is 50 years. It decays to another element 'Y' which is stable. The two elements 'X' and 'Y' were found to be in the ratio of 1 : 15 in a sample of a given rock. The age of the rock was estimated to be :
neet
physics
past papers
2011
43
asked
Aug 16, 2018
by
pady_1
1
answer
Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be (e being the charge on an electron) – 4?? 2
neet
physics
past papers
2010
43
asked
Jul 26, 2018
by
pady_1
1
answer
The ionization energy of the electron in the hydrogen atom in its grounds state is 13.6 eV. The atoms are excited to higher energy levels to emit radiations of 6 wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between :
neet
physics
past papers
2009
43
asked
Jul 26, 2018
by
pady_1
1
answer
The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the :
neet
physics
past papers
2008
43
asked
Jul 26, 2018
by
pady_1
1
answer
In radioactive decay process, the negatively charged emitted $\beta$- particles are :-
neet
physics
past papers
2007
43
asked
Jul 26, 2018
by
pady_1
1
answer
An electric dipole of moment p is lying along a r uniform electric field E . The work done in rotating the dipole by 90º is:-
neet
physics
past papers
2006
43
asked
Jul 25, 2018
by
pady_1
1
answer
A point source emits sound equally in all directions in a non-absorbind medium. Two ed points P and Q are at distance of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is -
neet
physics
past papers
2005
43
asked
Jul 24, 2018
by
pady_1
1
answer
The output of OR gate is 1 :-
neet
physics
past papers
2004
43
asked
Jul 24, 2018
by
pady_1
1
answer
According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature T is proportional to -
neet
physics
past papers
2003
43
asked
Jul 24, 2018
by
pady_1
2
answers
Identical charges (–q) are placed at each corner of a cube of side 'b' then electrical potential energy of charge (+q) which is placed at centre of cube will be
neet
physics
past papers
2002
43
asked
Jul 23, 2018
by
pady_1
1
answer
The resistance of each arm of the wheat stone bridge is 10 ohm. A resistance of 10 ohm is connected in series with galvanometer then the equivalent resistance across the battery will be :
neet
physics
past papers
2001
43
asked
Jul 20, 2018
by
pady_1
1
answer
The potentiometer is best for measuring voltage, as :
neet
physics
past papers
2000
43
asked
Jul 20, 2018
by
pady_1
2
answers
for nuclear reaction : $_{92}U^{235} +_0 n^1 \longrightarrow _{56}Ba^{144}+........+3_0n^1$
neet
physics
past papers
1998
43
asked
Jun 15, 2018
by
pady_1
1
answer
In Robbie's toy bin there are 23 red blocks. There are 4 more yellow blocks than red blocks. There are also 14 more blue blocks than red blocks. How many blocks are there in all?
class5
math
olympiad
logical
analytical
reasoning
43
asked
Dec 31, 2015
by
pady_1
1
answer
The number of lines of a symmetry in a $30^{\circ}-60^{\circ}-90^{\circ}$ set square is
class5
math
olympiad
data handling
43
asked
Dec 31, 2015
by
pady_1
3
answers
A square newspaper ad has an area of 9 square centimetres. How long is each side?
class5
math
olympiad
measurements
43
asked
Dec 31, 2015
by
pady_1
0
answers
The parking lot of the Mall has a capacity of 224 cars. On Thursday $\large\frac{6}{8}$ of the parking lot was occupied with cars. How many additional cars could park there?
class5
math
olympiad
fractions
decimals
43
asked
Dec 31, 2015
by
pady_1
1
answer
Sparrowtown Publishing needs to ship 88 new maths textbooks to a college. If each box can hold 8 textbooks, how many boxes will the publisher need?
class5
math
olympiad
computation
43
asked
Dec 31, 2015
by
pady_1
0
answers
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