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Recent questions tagged jeemain
Questions
The number of sigma and pi $(\pi)$ bonds presents in benzene respectively are :
jeemain
eamcet
chemistry
2006
q40
asked
Nov 5, 2013
by
meena.p
1
answer
$CH_3CH_2OH \longrightarrow CH_3CHO \longrightarrow Cl_3CCHO $ In above reactions the role of $Cl_2$ in step -I and Step-2 respectively is :
jeemain
eamcet
chemistry
2006
q39
asked
Nov 5, 2013
by
meena.p
1
answer
Which of the following reactions does not liberate gaseous product?
jeemain
eamcet
chemistry
2006
q38
asked
Nov 5, 2013
by
meena.p
0
answers
Eithyl chloride reacts with sodium ethoxide to form a compound A. Which of the following reactions also yields A?
jeemain
eamcet
chemistry
2006
q37
asked
Nov 5, 2013
by
meena.p
1
answer
What are the metal ions present in carnallite?
jeemain
eamcet
chemistry
2006
q36
asked
Nov 5, 2013
by
meena.p
1
answer
$C_6H+6+O_3 \longrightarrow \: \: \: X \: \: \: \underrightarrow{Zn/H_2O} \: \: \: Y$
jeemain
eamcet
chemistry
2011
q121
asked
Nov 4, 2013
by
thanvigandhi_1
1
answer
A zener diode voltage regulator operated in the range 120 - 180 V produces a constant supply of 110 V and 250 mA to the load. If the maximum current is to be equally shared between the load and zener, then the value of series resistance $(R_S)$ and load resistance (R_L)$ are :
jeemain
physics
eamcet
2011
q120
asked
Nov 4, 2013
by
thanvigandhi_1
1
answer
Two deuterium nuclei each of mass 'm' fuse together, to form a Helium nucleus, releasing an energy E . If 'c' is the velocity of light , the mass of Helium nucleus formed will be :
jeemain
eamcet
physics
2011
q119
asked
Nov 4, 2013
by
thanvigandhi_1
1
answer
When a light of photons of energy 4.2 eV is incident on a metallic sphere of radius 10 cm and work function 2.4 eV , photoelectrons are emitted. The number of photoelectrons liberated before the emission is stopped , is $(e=1.6 \times 10^{-19}C\: and \: \large\frac{1}{4 \pi \varepsilon_{\circ}} = 9 \times 10^9\: N-m^2/Coulomb^2)$ :
jeemain
eamcet
physics
2011
q118
asked
Nov 4, 2013
by
thanvigandhi_1
1
answer
When two electrons enter into a magnetic field with different velocities, they deflect in different circular paths, in such a way that the radius of one path is double that of the other $ 1 \times 10^7\: ms^{-1}$ is the velocity of the electron in smaller circle of radius $ 2 \times 10^{-3} m$ . The velocity of electron in the other circular path is :
jeemain
eamcet
physics
2011
q117
asked
Nov 4, 2013
by
thanvigandhi_1
1
answer
A long straight vertical conductor carries a current of 8 A in the upward direction. What is the magnitude of the resultant magnetic induction at a point in the horizontal plane at a distance of 4 cm from the conductor towards south ?
jeemain
eamcet
physics
2011
q116
asked
Nov 4, 2013
by
thanvigandhi_1
1
answer
A series LCR circuit is connected to a source of alternating emf 50 V and if the potential differences across inductor and capacitor are 90 V and 60 V respectively, the potential difference across resistor is :
jeemain
eamcet
physics
2011
q115
asked
Nov 4, 2013
by
thanvigandhi_1
1
answer
If $ \overline B$ is the magnetic induction, at the centre of a circular coil of radius 'r' carrying a current is 1 T then its value at a distance of $ \sqrt 3 \: r$ on the axis from the centre of the coil is:
jeemain
eamcet
physics
2011
q114
asked
Nov 4, 2013
by
thanvigandhi_1
1
answer
In the thermocouple, cold junction is at $0^{\circ}C$, hot junction is at $t^{\circ}C$. The graph drawn between thermo - emf (E) and temperature of the hot junction (t) is represented by the equation , $E=at+bt^2$. If $ a = -224b$ the neutral and the inversion temperatures of the thermocouple respectively, in degree celsius are :
jeemain
eamcet
physics
2011
q113
asked
Nov 4, 2013
by
thanvigandhi_1
1
answer
If $\overrightarrow a\;and\:\overrightarrow b$ are unit vectors and if vectors $\overrightarrow c=\overrightarrow a+2\overrightarrow b$ and $\overrightarrow d=5\overrightarrow a-4\overrightarrow b$ are $\perp$ to each other, then the angle between $\overrightarrow a\;and\:\overrightarrow b$ is ?
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q19
asked
Nov 4, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a$ and $\overrightarrow b$ are such that $|\overrightarrow a+\overrightarrow b|=\sqrt {29}$ and $\overrightarrow a\times (2\hat i+3\hat j+4\hat k)=(2\hat i+3\hat j+4\hat k) \times \overrightarrow b$, then the possible value of $(\overrightarrow a+\overrightarrow b).(-7\hat i+2\hat j+3\hat k)=?$
jeemain
math
class12
ch10
vector-algebra
difficult
vector-product
q18
asked
Nov 4, 2013
by
rvidyagovindarajan_1
1
answer
The vector $\hat i+x\hat j+3\hat k$ is rotated about angle $\theta$ and is doubled in magnitude, then it becomes $4\hat i+(4x-2)\hat j+2\hat k$. The value of $x=?$
jeemain
math
class12
ch10
vector-algebra
easy
addition-of-vectors
q17
asked
Nov 4, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a=\hat i-\hat k,\:\overrightarrow b=x\hat i+\hat j+(1-x)\hat k\:and\:\overrightarrow c=y\hat i+x\hat j+(1+x-y)\hat k$, then $[\overrightarrow a\:\overrightarrow b\:\overrightarrow c]$ depends on?
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q16
asked
Nov 4, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a=\hat i-\hat k,\:\overrightarrow b=x\hat i+\hat j+(1-x)\hat k\:and\:\overrightarrow c=y\hat i+x\hat j+(1+x-y)\hat k$, then $[\overrightarrow a\:\overrightarrow b\:\overrightarrow c]$ depends on?
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q20
asked
Nov 4, 2013
by
rvidyagovindarajan_1
1
answer
A battery of emf 'E' and internal resistance 'r' is connected to a resistor of resistance $'r_1'$ and Q Joules of heat is produced in a certain time 't'. When the same battery is connected to another resistor of resistance $'r_2'$ the same quantity of heat is produced in the same time 't'. Then, the value of 'r' is :
jeemain
eamcet
physics
2011
q112
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
In the circuit shown in figure, the ammeter shows 5 A current, voltmeter shows 250 v and the internal resistance of the voltmeter is 2500 $ \Omega$ then the value of R is :
jeemain
eamcet
physics
2011
q111
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
Consider a parallel plate capacitor of capacity 10 $ \mu\: F$ filled with air. When the gap between the plates is filled partly with a dielectric constant 4, as shown in figure.The new capacity of the capacitor is ( A is the area of plates ) :
jeemain
eamcet
physics
2011
q110
asked
Nov 2, 2013
by
thanvigandhi_1
2
answers
Four positive point chargers (+q) are kept at the four corners of a square of side 'l' . The net electric field at the midpoint of any one side of the square is , $ \bigg( take\: \large\frac{1}{4 \pi \varepsilon_{\circ}} = K \bigg)$
jeemain
eamcet
physics
2011
q109
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
A bar magnet of moment M gives a time period 'T' at a place in a vibration magnetometer. Four such similar bar magnets are placed in the frame one over the other out of which one magnet is placed with opposite polarity. The new time period is :
jeemain
eamcet
physics
2011
q108
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
P-V diagram of an ideal gas is shown in figure. Work done by the gas in the process ABCD is :
jeemain
eamcet
physics
2011
q107
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
When a liquid filled in two vessels A and B of equal volumes, is heated, the coefficients of apparent expansions of the liquids are found to be $ \gamma_1\: and \: \gamma_2$ respectively. If $ \alpha_1$ be the coefficient of linear expansion of A, then the coefficient of linear expansion of B will be :
jeemain
eamcet
physics
2011
q106
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
At $ 10^{\circ}C$, the value of the density of a fixed mass of an ideal gas divided by its pressure is 'x' . At $110^{\circ}C$ this ratio is :
jeemain
eamcet
physics
2011
q105
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
A liquid flows through two capillary tubes A and B connected in series. The length and radius of B are twice that of A. The ratio of pressure difference across A and across B is :
jeemain
eamcet
physics
2011
q104
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
The surface energy of a liquid drop is E. It is sprayed into 1000 equal droplets. Then their surface energy is
jeemain
eamcet
physics
2011
q103
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
An Aluminium and Copper wire of same cross sectional area but having lengths in the ratio 2 : 3 are joined end to end. This composite wire is hung from a rigid support and a load is suspended from the free end. If the increase in length of the composite wire is 2.1 mm , the increase in lengths of Aluminium and Copper wires are : [$ Y_{AI} = 20\times 10^{11}N/m^2\: and \: Y_{Cu} = 12 \times 10^{11} N/m^2]$
jeemain
eamcet
physics
2011
q102
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
The time period of a simple harmonic motion is 8s. At t=0 , it is at its equilibrium position. The ratio of distances traversed by it in the first and second seconds is :
jeemain
eamcet
physics
2011
q101
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
A body is projected vertically upwards from the surface of the earth with a velocity equal to $\large\frac{3}{4}$th escape velocity of earth. If 'R' is the radius of earth, the maximum height attained by the body is :
jeemain
eamcet
physics
2011
q100
asked
Nov 2, 2013
by
thanvigandhi_1
2
answers
A wheel of radius 0.5 m rolls without sliding on a horizontal surface, starting from rest, the wheel moves with constant acceleration $6\: rad/s^2$ . The distance travelled by the centre of the wheel from $ t = 0 \: to \: t=3s$ is :
jeemain
eamcet
physics
2011
q99
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
Two circular rings of equal mass (m) and radius (r) are placed side by side, touching each other. The moment of inertia of the system about tangential axis in the plane of system passing through point of contact of the rings is :
jeemain
eamcet
physics
2011
q98
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
A uniform chain of length 'l' is placed on a rough table, with its length $ \large\frac{l}{n} ( n > 1)$ hanging over the edge of the table. If the chain just begins to slide off the table by itself, the coefficient of friction between the chain and the table is :
jeemain
eamcet
physics
2011
q97
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
A uniform metal disc of diameter 24 cm is taken and out of it a disc of diameter 8 cm is cut off from the right side end. The centre of mass of the remaining part will be at :
jeemain
eamcet
physics
2011
q96
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
A shell is fired from a cannon with a velocity 'v' at an angle $ '\theta'$ with the horizontal. At the highest point in its path it explodes into two pieces of equal masses. One of the pieces retraces its path and reaches the cannon. Then the velocity of the other piece immediately after collision is :
jeemain
eamcet
physics
2011
q95
asked
Nov 2, 2013
by
thanvigandhi_1
1
answer
A bullet is fired normally towards an immovable wooden block. It loses 25% of its kinetic energy in penetrating through a thickness 'x' of the plank. The total thickness penetrated by the bullet into the block is :
jeemain
eamcet
physics
2011
q94
asked
Nov 1, 2013
by
thanvigandhi_1
1
answer
The acceleration of 3 kg mass in figure shown is ( assume $g = 10 m/s^2 )$ :
jeemain
eamcet
physics
2011
q93
asked
Nov 1, 2013
by
thanvigandhi_1
0
answers
If $\overrightarrow a\:\:and\:\:\overrightarrow b$ are unit vectors and $\theta$ is angle between them then $\large\frac{1}{2}$$|\overrightarrow a-\overrightarrow b|$=?
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vector
q15
asked
Nov 1, 2013
by
rvidyagovindarajan_1
1
answer
A ball is dropped into a well. The water level in the well is at a depth 'h' below the top. If the speed of sound is V, then after what time the splash of sound is heard?
jeemain
eamcet
physics
2011
q92
asked
Nov 1, 2013
by
thanvigandhi_1
2
answers
Two vectors are $( \overrightarrow A + \overrightarrow B)$ and $( \overrightarrow A - \overrightarrow B)$. The angle between their resultant vector and $ \overrightarrow A $ is :
jeemain
eamcet
physics
2011
q91
asked
Nov 1, 2013
by
thanvigandhi_1
1
answer
$(\overrightarrow a+\overrightarrow b+\overrightarrow c).[(\overrightarrow a+\overrightarrow b)\times (\overrightarrow a+\overrightarrow c)]=?$
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q14
asked
Nov 1, 2013
by
rvidyagovindarajan_1
1
answer
Match the following physical quantities with their respective dimensional formula :
jeemain
eamcet
physics
2011
q90
asked
Nov 1, 2013
by
thanvigandhi_1
1
answer
If $\overrightarrow p,\overrightarrow q$ are non collinear vectors, then $[\hat i\:\overrightarrow p\:\overrightarrow q]\hat i+[\hat j\:\overrightarrow p\:\overrightarrow q]\hat j+[\hat k\:\overrightarrow p\:\overrightarrow q]\hat k$=?
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
vector-product
q13
asked
Nov 1, 2013
by
rvidyagovindarajan_1
1
answer
A magnet of length 10 cm and magnetic moment $1 Am^2$ is placed along the side AB of an equilateral triangle ABC. If the length of sides AB is 10 cm, the magnetic induction at point C is :
jeemain
eamcet
physics
2011
q89
asked
Nov 1, 2013
by
thanvigandhi_1
2
answers
Two polarizers have their axis inclined at $ 45^{\circ}$ to each other. If unpolarized light of intensity $I_{\circ}$ is incident on the first polarizer , then the intensity transmitted light through second polarizer is :
jeemain
eamcet
physics
2011
q88
asked
Nov 1, 2013
by
thanvigandhi_1
1
answer
The angle between the diagonals of a parallelogram $ABCD$, where $\overrightarrow {AB}=3\hat i-2\hat j+2\hat k$ and $\overrightarrow {BC}=-\hat i-2\hat k$ is?
jeemain
math
class12
ch10
vector-algebra
easy
addition-of-vectors
q12
asked
Nov 1, 2013
by
rvidyagovindarajan_1
1
answer
When a light of wavelength 4000 A in vacuum travels through the same thickness in diamond and water separately, the difference in the number of waves is 200. Find the thickness, if refractive indices of diamond and water are $ \large\frac{5}{2}\: and \: \large\frac{4}{3}$ respectively :
jeemain
eamcet
physics
2011
q87
asked
Nov 1, 2013
by
thanvigandhi_1
1
answer
A thin bi-convex lens of focal length 20 cm is made of glass of refractive index 1.5, when it is dipped in a liquid of refractive index $ \large\frac{9}{8} $, it acts as :
jeemain
eamcet
physics
2011
q86
asked
Nov 1, 2013
by
thanvigandhi_1
1
answer
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