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Recent questions tagged 21
Questions
The manganate and permanganate ions are tetrahedral, due to
neet
chemistry
past papers
2019
21
asked
Jul 8, 2019
by
pady_1
1
answer
A real gas can be approximated to an ideal gas at :
jeemain
physics
past papers
1998
21
asked
Dec 19, 2018
by
pady_1
1
answer
The elongation of a steel wire stretched by a force is $e$. If a wire of the same material of double the length, and half the diameter is subjected to double the force, its elongation will be :
jeemain
physics
past papers
1999
21
asked
Dec 19, 2018
by
pady_1
0
answers
The fundamental physical quantities that have same dimensions in the dimensional formula of torque and angular momentum are :
jeemain
physics
past papers
2000
21
asked
Dec 19, 2018
by
pady_1
0
answers
When a resistor of $11 \; \Omega$ is connected in series with an electric cell, the current flowing in it is $0.5 \;A$. Instead, when a resistor of $5 \Omega$ is connected to the same electric cell in series, the current increases by $0.4 \;A$. The internal resistance of the cell is :
jeemain
physics
past papers
2001
21
asked
Dec 11, 2018
by
pady_1
0
answers
Two identical particle move towards each other with velocity $ 2v$ and $v$ respectively. The velocity of centre of mass is :
jeemain
physics
past papers
2002
21
asked
Dec 11, 2018
by
pady_1
0
answers
A car moving with a speed of $50\; km/h$, can be stopped by brakes after at least $6 \;m$. If the same car is moving at a speed of $100\; km/h$, the minimum stopping distance is :
jeemain
physics
past papers
2003
21
asked
Dec 11, 2018
by
pady_1
0
answers
A silver atom in a solid oscillates in simple harmonic motion in some direction with a frequency of $10^{12}/sec$. What is the force constant of the bonds connecting one atom with the other? <br> (Mole wt. of silver = 108 and Avagadro number = $6.02 \times 10^{23} gm\; mole^{-1}$)
jeemain
physics
past papers
2018
21
asked
Dec 11, 2018
by
pady_1
0
answers
Let $\overrightarrow{a} = 2 \hat{i} +\hat{j} - 2 \hat{k}$ and $\overrightarrow{b} = \hat{i} + \hat{j}$. Let $\overrightarrow{c}$ be a vector such that $| \overrightarrow{c} - \overrightarrow{a} | = 3, \; |(\overrightarrow{a} \times \overrightarrow{b} ) \times \overrightarrow{c} |=3$ and the angle between $\overrightarrow{c}$ and $\overrightarrow{a} \times \overrightarrow{b} $ be $30^{\circ}$. The $\overrightarrow{a}.\overrightarrow{c}$ is equal to
jeemain
math
past papers
2017
21
asked
Dec 11, 2018
by
pady_1
1
answer
Radiation of wavelength $\lambda$, is incident on a photocell. The fastest emitted electron has speed $v$. If the wavelength is changed to $\frac{3λ}{4}$ , the speed of the fastest emitted electron will be :
jeemain
physics
past papers
2016
21
asked
Dec 11, 2018
by
pady_1
0
answers
When current in a coil changes from $5\; A$ to $2\; A$ in $0.1 \;s$, an average voltage of $50\; V$ is produced. The self - inductance of the coil is :
jeemain
physics
past papers
2015
21
asked
Dec 11, 2018
by
pady_1
0
answers
A pipe of length 85 cm is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose frequencies lie below 1250 Hz. The velocity of sound in air is 340 m/s.
jeemain
physics
past papers
2014
21
asked
Dec 11, 2018
by
pady_1
0
answers
The order of stability of the following carbocations : <br> <br> is
jeemain
chemistry
past papers
2013
21
asked
Dec 11, 2018
by
pady_1
0
answers
Three numbers are chosen at random without replacement from $\{1, 2, 3, ....,8 \}$. The probability that their minimum is 3, given that their maximum is 6, is
jeemain
math
past papers
2012
21
asked
Dec 11, 2018
by
pady_1
0
answers
A Carnot engine operating between temperatures $T_1$ and $T_2$ has efficiency $\frac{1}{6}$. When $T_2$ is lowered by 62 $K$, its efficiency increases to $\frac{1}{3}$. Then $T_1$ and $T_2$ are, respectively :
jeemain
physics
past papers
2011
21
asked
Dec 11, 2018
by
pady_1
0
answers
The correct sequence which shows decreasing order of the ionic radii of the elements is
jeemain
chemistry
past papers
2010
21
asked
Dec 11, 2018
by
pady_1
0
answers
A long metallic bar is carrying heat from one of its end to the other end under steady-state. The variation of temperature $\theta$ along the length x of the bar from its hot end is best described by which of the following figure :
jeemain
physics
past papers
2009
21
asked
Nov 29, 2018
by
pady_1
0
answers
In a shop there are five types of ice-creams available. A child buys six ice-creams.<br> Statement -1: The number of different ways the child can buy the six ice-creams is $^{10}C_5$<br> Statement -2: The number of different ways the child can buy the six ice-creams is equal to the number of different ways of arranging 6 A’s and 4 B’s in a row.
jeemain
math
past papers
2008
21
asked
Nov 29, 2018
by
pady_1
0
answers
A value of C for which the conclusion of Mean Value Theorem holds for the function $f(x) = \log_e x $ on the interval $[1,3]$ is :
jeemain
math
past papers
2007
21
asked
Nov 29, 2018
by
pady_1
0
answers
The threshold frequeny for a metallic surface corresponds to an energy of 6.2 eV and the stopping potential for a radiation incident on this surface is 5V. The incident radiation lies in :
jeemain
physics
past papers
2006
21
asked
Nov 13, 2018
by
pady_1
0
answers
The system of equations <br>$\alpha x + y + z = \alpha -1$<br>$x + \alpha y + z = \alpha -1 $ <br>$x + y + \alpha z = \alpha - 1$ <br> has no solution, if $\alpha$ is :
jeemain
math
past papers
2005
21
asked
Nov 5, 2018
by
pady_1
0
answers
A body of mass m is accelerated uniform from rest to a speed $\nu$ in a time $T$. The instantaneous power delivered to the body as a function of time, is given by :
jeemain
physics
past papers
2005
21
asked
Nov 5, 2018
by
pady_1
0
answers
Let $\alpha, \beta$ be such that $\pi - \alpha - \beta < 3 \pi$. If $\sin \alpha + \sin \beta = -\frac{21}{65}$ and $\cos \alpha + \cos \beta = -\frac{27}{65}$, then the value of $\cos \frac{\alpha - \beta}{2}$ is
jeemain
math
past papers
2004
21
asked
Nov 5, 2018
by
pady_1
0
answers
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
neet
physics
past papers
2018
21
asked
Aug 21, 2018
by
pady_1
1
answer
Which is the incorrect statement ?
neet
chemistry
past papers
2017
21
asked
Aug 21, 2018
by
pady_1
1
answer
The correct thermodynamic conditions for the spontaneous reaction at all temperatures is :
neet
chemistry
past papers
2016
21
asked
Aug 21, 2018
by
pady_1
1
answer
Which of the following statements is not correct for a nucleophile?
neet
chemistry
past papers
2015
21
asked
Aug 21, 2018
by
pady_1
1
answer
The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lies below 1250 Hz are: (velocity of sound = $340 \;ms^{-1}$)
neet
physics
past papers
2014
21
asked
Aug 20, 2018
by
pady_1
1
answer
It we study the vibration of a pipe open at both ends, then the following statement is not true -
neet
physics
past papers
2013
21
asked
Aug 20, 2018
by
pady_1
1
answer
A coil of resistance $400\Omega$ is placed in a magnetic filed. if the magnetic flux $\phi$ (wb) linked with the coil varies with times t(sec) as <br> $\phi = 50 t^2 + 4.$ . The current is the coil at t = 2 sec is
neet
physics
past papers
2012
21
asked
Aug 20, 2018
by
pady_1
1
answer
A current carrying closed loop in the form of a right angle isoceles triangle ABC is placed in a uniform magnetic field acting along AB. If the magnetic force on the arm BC is $\overrightarrow{F}$ , the force on the arm AC is : <br>
neet
physics
past papers
2011
21
asked
Aug 16, 2018
by
pady_1
2
answers
Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be –
neet
physics
past papers
2010
21
asked
Jul 26, 2018
by
pady_1
1
answer
Which one of the following equations of motion represents simple harmonic motion ? <br> Where $k,\; k_0,\; k_1$ and a are all positive
neet
physics
past papers
2009
21
asked
Jul 26, 2018
by
pady_1
1
answer
On a new scale of temperature (which is linear) s and called the W scale, the freezing and boiling points of water are 39º W and 239º W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39ºC on the Celsius scale ?
neet
physics
past papers
2008
21
asked
Jul 26, 2018
by
pady_1
1
answer
The electric and magnetic field of an electromagnetic wave are:-
neet
physics
past papers
2007
21
asked
Jul 26, 2018
by
pady_1
1
answer
A forward biased diode is:-
neet
physics
past papers
2006
21
asked
Jul 25, 2018
by
pady_1
1
answer
As a result of change in the magnetic flux linked to the closed loop shown in the figure, an e.m.f. V volt is induced in the loop. The work done (joules) in taking a charge Q coulomb once along the loop is
neet
physics
past papers
2005
21
asked
Jul 24, 2018
by
pady_1
1
answer
The dimensions of universal gravitational constant are :-
neet
physics
past papers
2004
21
asked
Jul 24, 2018
by
pady_1
1
answer
An ideal gas heat engine operates in a carnot cycle between $227^{\circ}C$ and $127^{\circ}C$. It absorbs 6 kcal at the higher temperature. The amount of heat (in kcal) converted into work is equal to -
neet
physics
past papers
2003
21
asked
Jul 24, 2018
by
pady_1
1
answer
Unit of Stefan's constant is : -
neet
physics
past papers
2002
21
asked
Jul 23, 2018
by
pady_1
1
answer
With what velocity should a particle be projected so that its height becomes equal to radius of earth -
neet
physics
past papers
2001
21
asked
Jul 20, 2018
by
pady_1
1
answer
Motion of a particle is given by equation $S=({3t^3}+{7t^2}+14 t+8)m$ The value of acceleration of the particle at t = 1 sec. is :
neet
physics
past papers
2000
21
asked
Jul 20, 2018
by
pady_1
1
answer
Work function of a metal surface is $\phi$ = 1.5 eV. If a light of wavelength 5000Å falls on it then the maximum K.E. of ejected electron will be -
neet
physics
past papers
1998
21
asked
Jun 15, 2018
by
pady_1
1
answer
From the word 'POSTSCRIPT', how many independent words can be made without changing the order of the letters and using each letters only once?
class5
math
olympiad
logical
analytical
reasoning
21
asked
Dec 31, 2015
by
pady_1
1
answer
Dedra is planting flowers in her garden. She plants 3 flowers in the first row, 5 flowers in the second row, 8 flowers in the third row, and 12 flowers in the fourth row. If this pattern continues, how many flowers will Dedra plant in the fifth row?
class5
math
olympiad
data handling
21
asked
Dec 31, 2015
by
pady_1
0
answers
Find the breadth of a pathway whose area is 5000 sq m and length is 250 m.
class5
math
olympiad
measurements
21
asked
Dec 31, 2015
by
pady_1
0
answers
Following shape is made of several small cubes. What fraction of cubes are not visible in the picture shown below ?
class5
math
olympiad
fractions
decimals
21
asked
Dec 31, 2015
by
pady_1
1
answer
The cost of 11 pencils is Rs. 176. What will be the cost of 15 pencils ?
class5
math
olympiad
computation
21
asked
Dec 31, 2015
by
pady_1
0
answers
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