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Recent questions tagged 8
Questions
The number of sigma $(\sigma)$ and pi $ (\pi)$ bonds in pent-2-en-4-yne is :-
neet
chemistry
past papers
2019
8
asked
Jul 8, 2019
by
pady_1
1
answer
If a body is in equilibrium under a set of non-collinear forces, the minimum number of forces has to be :
jeemain
physics
past papers
1998
8
asked
Dec 19, 2018
by
pady_1
0
answers
The angle between two vectors $6 \hat{i} + 6 \hat{j} - 3 \hat {k} $ and $7 \hat{i} +4 \hat{j} + 4 \hat{k}$ is given by :
jeemain
physics
past papers
1999
8
asked
Dec 19, 2018
by
pady_1
0
answers
Under minimum deviation condition in a prism, if a ray incident at an angle of $30^{\circ}$. The angle between the emergent ray and the second refracting surface of the prism is :
jeemain
physics
past papers
2000
8
asked
Dec 19, 2018
by
pady_1
0
answers
A magnet of length $10\; cm$ and magnetic moment $1\; Am^2$ is placed along side AB of an equilateral triangle ABC. If the length of the side AB is $10\; cm$. The magnetic induction at the point 'C' is :<br> $(\mu_0 = 4 \pi \times 10^{-7} Hm^{-1})$
jeemain
physics
past papers
2001
8
asked
Dec 11, 2018
by
pady_1
1
answer
If two mirrors are kept at $ 60^{\circ}$ to each other, then the number of images formed by them is :
jeemain
physics
past papers
2002
8
asked
Dec 11, 2018
by
pady_1
0
answers
The length of a wire of a potentiometer is 100 cm, and the emf of its stand and cell is E volt. It is employed to measure the emf of a battery whose internal resistance is $0.5 \Omega$. If the balance point is obtained at $l = 30\; cm$ from the positive end, the emf of the battery is :
jeemain
physics
past papers
2003
8
asked
Dec 11, 2018
by
pady_1
0
answers
Unpolarized light of intensity I passes through an ideal polarized A. Another identical polarizer B is placed behind A. The intensity of light beyond B is found to be $\frac{I}{2}$. Now another identical polarizer C is placed between A and B. The intersity beyond B is now found to be $\frac{I}{8}$. The angle between polarizer A and C is :
jeemain
physics
past papers
2018
8
asked
Dec 11, 2018
by
pady_1
0
answers
The area (in sq. units) of the region $\{ (x, y) : x \geq 0, \; x + y \leq 3, \; x^2 \leq 4y$ and $ y \leq 1 + \sqrt{x} \}$ is :
jeemain
math
past papers
2017
8
asked
Dec 11, 2018
by
pady_1
2
answers
An ideal gas undergoes a quasi static, reversible process in which its molar heat capacity C remains constant. If during this process the relation of pressure P and volume V is given by $PV^n$=constant, then $n$ is given by (Here $C_P$ and $C_V$ are molar specific heat at constant pressure and constant volume, respectively) :
jeemain
physics
past papers
2016
8
asked
Dec 11, 2018
by
pady_1
0
answers
If it takes 5 minutes to fill a 15 litre bucket from a water tap of diameter $\frac{2}{\sqrt{\pi}}$ then the Reynolds number for the flow is (density of water $=10^3\; kg/m^3$ and viscosity of water $=10^{-3}$ Pa.s) close to :
jeemain
physics
past papers
2015
8
asked
Dec 11, 2018
by
pady_1
0
answers
A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it?
jeemain
physics
past papers
2014
8
asked
Dec 11, 2018
by
pady_1
0
answers
The coagulating power of electrolytes having ions $Na^+, Al^{3+}$ and $Ba^{2+}$ for arsenic sulphide sol increases in the order :
jeemain
chemistry
past papers
2013
8
asked
Dec 11, 2018
by
pady_1
0
answers
Let $A = \begin{pmatrix} 1 & 0 & 0 \\ 2 & 1 & 0 \\ 3 & 2 & 1 \end{pmatrix}$. If $u_1$ and $u_2$ are column matrices such that $Au_1 = \begin{pmatrix} 1 \\ 0 \\ 0 \end{pmatrix} $ and $Au_2 = \begin{pmatrix} 0 \\ 1 \\ 0 \end{pmatrix} $, then $u_1 + u_2$ is equal to
jeemain
math
past papers
2012
8
asked
Dec 11, 2018
by
pady_1
1
answer
Two identical charged spheres suspended from a common point by two massless strings of length $l$ are initially a distance $d(d <<1)$ apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result the charge approach each other with a velocity v. Then as a function of distance x between them,
jeemain
physics
past papers
2011
8
asked
Dec 11, 2018
by
pady_1
0
answers
From amongst the following alcohols the one that would react fastest with conc. $HCl$ and anhydrous $ZnCl_2$, is
jeemain
chemistry
past papers
2010
8
asked
Dec 11, 2018
by
pady_1
0
answers
Let $P(r) = \frac{Q}{\pi R^4} r$ be the charge density distribution for a solid sphere of radius R and total charge Q for a point 'p' inside the sphere at distance $r_1$ from the centre of the sphere, the magnitude of electric field is
jeemain
physics
past papers
2009
8
asked
Nov 29, 2018
by
pady_1
0
answers
The conjugate of a complex number is $\frac{1}{i-1}$.The conjugate of a complex number is
jeemain
math
past papers
2008
8
asked
Nov 29, 2018
by
pady_1
0
answers
Consider a family of circles which are passing through the point $(-1, 1)$ and are tangent to $x-axis$. If $(h, k)$ are the coordinates of the centre of the circles, then the set of values of $k$ is given by the interval :
jeemain
math
past papers
2007
8
asked
Nov 29, 2018
by
pady_1
1
answer
A whistle producing sound waves of frequencies 9500 Hz and above is approaching a stationary person with speed $\nu \; ms^{-1}$. The velocity of sound in air is $300 \; ms^{-1}$. If the person can hear frequencies upto a maximum of 10,000 Hz, the maximum value of $\nu$ upto which he can hear the whistle is :
jeemain
physics
past papers
2006
8
asked
Nov 13, 2018
by
pady_1
0
answers
Area of the greatest rectangle that can be inscribed in the ellipse $\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1 $ is :
jeemain
math
past papers
2005
8
asked
Nov 5, 2018
by
pady_1
0
answers
A car starting from rest, accelerates at the rate $f$ through a distance $S$, then continues at constant speed for time $t$ and then decelerates at the rate $f/2$ to come to rest. If the total distance travelled is $15 \;S$, then :
jeemain
physics
past papers
2005
8
asked
Nov 5, 2018
by
pady_1
0
answers
If $a_1, a_2, a_3, ....,a_n,....$ are in G.P., then the value of the determinant $\begin{vmatrix} \log a_n & \log a_{n+1} & \log a_{n+2} \\ \log a_{n+3} & \log a_{n+4} & \log a_{n+5} \\ \log a_{n+6} & \log a_{n+7} & \log a_{n+8} \end{vmatrix}$, is
jeemain
math
past papers
2004
8
asked
Nov 5, 2018
by
pady_1
0
answers
Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied ) is 20 div/V. The resistance of the galvanometer is
neet
physics
past papers
2018
8
asked
Aug 21, 2018
by
pady_1
1
answer
The reason for greater range of oxidation states in actinoids is attributed to :
neet
chemistry
past papers
2017
8
asked
Aug 21, 2018
by
pady_1
1
answer
The electronic configurations of Eu (Atomic No. 63), Gd(Atomic No. 64) and Tb (Atomic No. 65) are:
neet
chemistry
past papers
2016
8
asked
Aug 21, 2018
by
pady_1
1
answer
Caprolactam is used for the manufacuture of :
neet
chemistry
past papers
2015
8
asked
Aug 21, 2018
by
pady_1
1
answer
The oscillation of a body on a smooth horizonatal surface is represented by the equation, $X = A \cot (\omega t)$ <br> where, $X$ = displacement at time $t$ <br> $\omega$ = frequency of oscillation <br> Which one of the following graph shows correctly the variation $'a'$ with $'t'$ ? <br> Here a = acceleration at time t <br> T = time period
neet
physics
past papers
2014
8
asked
Aug 20, 2018
by
pady_1
1
answer
A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is -
neet
physics
past papers
2013
8
asked
Aug 20, 2018
by
pady_1
1
answer
Two spheres A and B of masses m1 and m2 respectively collide. A is at rest initially and B is moving with velocity v along x-axis. After collision B has a velocity$\frac{v}{2}$ in a direction perpendicular to the original direction. The mass A moves after collision in the direction.
neet
physics
past papers
2012
8
asked
Aug 20, 2018
by
pady_1
1
answer
A body of mass M hits normally a rigid wall with velocity V and bounces back with the same velocity. The impulse experienced by the body is -
neet
physics
past papers
2011
8
asked
Aug 16, 2018
by
pady_1
1
answer
A ball is droped from a high rise platform at t = 0 starting fro rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t = 18 s. What is the value of v ? (take g = 10 m/s2)
neet
physics
past papers
2010
8
asked
Jul 26, 2018
by
pady_1
1
answer
Four identical thin rods each of mass M and length l, from a square frame. Moment of inertia of this frame about an axis through the centre of the square and perpendicular to its plane is :
neet
physics
past papers
2009
8
asked
Jul 26, 2018
by
pady_1
1
answer
Two nuclei have their mass numbers in the ratio of 1 : 3. The ratio of their nuclear densities would be -
neet
physics
past papers
2008
8
asked
Jul 26, 2018
by
pady_1
1
answer
$\overrightarrow{A}$ and $\overrightarrow{B} $ are two vectors and $\theta$ is the angle between them, if $| \overrightarrow{A} \times \overrightarrow{B} | = \sqrt{3} (\overrightarrow{A}.\overrightarrow{B})$ the value of $\theta$ is:-
neet
physics
past papers
2007
8
asked
Jul 26, 2018
by
pady_1
1
answer
Two circular coil 1 and 2 are made from the same wire but the radius of the $1^{st}$ coil is twice that of the $2^{nd}$ coil. What potential difference in volts should be applied across them so that the magnetic field at their centres is the same-
neet
physics
past papers
2006
8
asked
Jul 25, 2018
by
pady_1
1
answer
An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of the circle is proportional to :
neet
physics
past papers
2005
8
asked
Jul 24, 2018
by
pady_1
1
answer
Of the diodes shown in the following diagrams, which one of the diode is reverse biased ? +5V R
neet
physics
past papers
2004
8
asked
Jul 24, 2018
by
pady_1
1
answer
A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope ? ($g = 10 m/s^2$)
neet
physics
past papers
2003
8
asked
Jul 24, 2018
by
pady_1
1
answer
Which is having minimum wavelength : -
neet
physics
past papers
2002
8
asked
Jul 23, 2018
by
pady_1
1
answer
Two particles having mass 'M' and 'm' are moving in a circular path having radius R and r respectively. If their time period are same then the ratio of angular velocity will be : -
neet
physics
past papers
2001
8
asked
Jul 20, 2018
by
pady_1
1
answer
For the given reaction, the particle X is : ${6^C}^{11}\rightarrow{5^B}^{11}+\beta^+{+}X$
neet
physics
past papers
2000
8
asked
Jul 20, 2018
by
pady_1
1
answer
A circular ring of mass M and radius R is rotating about its axis with constant angular velocity $\omega$. Two particle each of mass m are attached gently to the opposite ends of a diameter of the ting. The angular velocity of the ring will now become :
neet
physics
past papers
1998
8
asked
Jun 15, 2018
by
pady_1
2
answers
Site of cellular respiration is
cbsc
class
8
biology
olympiad
t3
asked
Aug 25, 2017
by
priyanka.c
1
answer
Plant diversity can be preserved through the use of
cbsc
class
8
biology
olympiad
t3
asked
Aug 23, 2017
by
priyanka.c
1
answer
Many different kinds of plants are being maintained all over the world in
cbsc
class
8
biology
olympiad
t3
asked
Aug 23, 2017
by
priyanka.c
1
answer
The technique used to preserve milk is
cbsc
class
8
biology
olympiad
t3
asked
Aug 19, 2017
by
priyanka.c
1
answer
Milk turns into curd sue to action of
cbsc
class
8
biology
olympiad
t3
asked
Aug 19, 2017
by
priyanka.c
1
answer
Apiculture is the rearing of
cbsc
class
8
biology
olympiad
t3
asked
Aug 19, 2017
by
priyanka.c
1
answer
The places meant for conservation of biodiversity in their natural habitat are <br>i. Zoological garden <br>ii. Botanical garden <br>iii. Wild life sanctuary <br>iv. National park
cbsc
class
8
biology
olympiad
t2
asked
Aug 18, 2017
by
priyanka.c
1
answer
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