Recent questions tagged class12

A solid metallic sphere of radius a is surrounded by a conducting spherical shell of radius b $\;(b >a)\;$ . The solid sphere is given a charge Q . Potential at the surface of the solid sphere is $\;V_{a}\;$ and at the surface of spherical shell is $\;V_{b}\;$. If we put -4Q charge on the shell the potential differance between the sphere and shell becomes $\;\bigtriangleup V\;.$ Now we earthed the outer shell and the charge on the ouer shell is $\;q_{1}\;$.Now we removed the earthing connection from the shell and earthed the inner solid sphere. Charge on solid sphere becomes $\;q_{2}\;$. Answer the following question based on the passage.$\;q_{1}\;$ is

asked Feb 20, 2014 by yamini.v

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Two monochromatic coherent sources of wavelength 5000 A are placed along line normal to screen as shown. Then the condition for maxima at the point P is :

asked Feb 20, 2014 by meena.p

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A solid metallic sphere of radius a is surrounded by a conducting spherical shell of radius b $\;(b >a)\;$ . The solid sphere is given a charge Q . Potential at the surface of the solid sphere is $\;V_{a}\;$ and at the surface of spherical shell is $\;V_{b}\;$. If we put -4Q charge on the shell the potential difference between the sphere and shell becomes $\;( \bigtriangleup V )\;.$ Now we earthed the outer shell and the charge on the ouer shell is $\;q_{1}\;$.Now we removed the earthing connection from the shell and earthed the inner solid sphere. Charge on solid sphere becomes $\;q_{2}\;$. Answer the following question based on the passage. Potential difference $\;(\bigtriangleup V) \;$ measured between the inner solid sphere and outer shell after putting a charge -4Q is

asked Feb 20, 2014 by yamini.v

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A typical compound under goes Cannizzaro's reaction as well as aldol condensation.The possible compound is

asked Feb 20, 2014 by sreemathi.v

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The below reduction reaction is known as

asked Feb 20, 2014 by sreemathi.v

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Benzaldehyde differs from acetaldehyde in that

asked Feb 20, 2014 by sreemathi.v

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Which is a product X of the below reaction:

asked Feb 20, 2014 by sreemathi.v

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A light ray enters into a medium whose refractive index varies along x-axis as $y(x) = \mu_{circ} \sqrt {1+ 0.25 x}.$ Where $\mu_0=1$.The medium is bounded by the planes $x=0,x=1\;cm$ and $y=0$ . If the ray enters at an angle $\theta=30^{\circ}$ with horizontal . Then the trajectory of light ray is

asked Feb 20, 2014 by meena.p

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Two particles $ X$ and $Y$ equal charges enter a region of uniform magnetic field after being accelerated through the same potential difference and describe circular paths of radii $R_X$ and $R_Y$ respectively. The ratio of their masses is

asked Feb 19, 2014 by thanvigandhi_1

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The ratio of the magnetic field at the centre of a current carrying coil to its magnetic moment is $ x$. If the current and the radius are both doubled, the new ratio will become

asked Feb 19, 2014 by thanvigandhi_1

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If a magnetic needle is kept in a non-uniform magnetic field, it experiences

asked Feb 19, 2014 by thanvigandhi_1

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Four point charges $\;+8 \mu C\;,-1 \mu C\;,-1 \mu C\;and\;+8 \mu C\;$ are fixed at the points $\;-\sqrt{\large\frac{27}{2}} m \;,- \sqrt{\large\frac{3}{2}} m \;,+ \sqrt{\large\frac{3}{2}} m \;and\;+\sqrt{\large\frac{27}{2}} m\;$ respectively on the Y-axis . A particle of mass $\;6\times10^{-4} kg\;$ and charge $\;0.1 \mu C \;$ moves along the - X direction . It's speed at $\;x=+ \infty\;$ is $\;V_{0}\;. \quad \;$ Answer the following question based on the passage. Kinetic energy of the particle at origin would be

asked Feb 19, 2014 by yamini.v

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In the ideal YDSE when a glass plate (RI= 1.5) of thickness t is introduced in path of one of interfering beams , the intensity at the position where central maximum occurred previously remains unchanged. The minimum thickness of glass plate is :

asked Feb 19, 2014 by meena.p

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A hollow double concave lens is made of very thin transparent material It can be filled with air or either of two liquids $L_1$ or $L_2$ having refracting indices $n_1$ and $n_2$ respectively $( n_2 > n_1 > 1)$ The lens will diverge a parallel beam of light if it is filled with

asked Feb 19, 2014 by meena.p

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A coil having $N$ turns is wound tightly in the form of a spiral with inner and outer radii as $a$ and $b$ respectively. The magnetic field at the centre when a current $i$ passes through it is

asked Feb 19, 2014 by thanvigandhi_1

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A particle of charge $q$ and mass $m$ is moving with a constant velocity v along $+x$ - axis. It enters a region of constant magnetic field along $-z$ - axis from $x = a$ to $x = b$. The minimum value of $ v$ required so that the particle can enter the region $x>b$ is

asked Feb 19, 2014 by thanvigandhi_1

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Four point charges $\;+8 \mu C\;,-1 \mu C\;,-1 \mu C\;and\;+8 \mu C\;$ are fixed at the points $\;-\sqrt{\large\frac{27}{2}} m \;,- \sqrt{\large\frac{3}{2}} m \;,+ \sqrt{\large\frac{3}{2}} m \;and\;+\sqrt{\large\frac{27}{2}} m\;$ respectively on the Y-axis . A particle of mass $\;6\times10^{-4} kg\;$ and charge $\;0.1 \mu C \;$ moves along the - X direction . It's speed at $\;x=+ \infty\;$ is $\;V_{0}\;. \quad \;$ Answer the following question based on the passage. Find the least value of $\;V_{0}\;$ for which the particle will cross the origin .

asked Feb 19, 2014 by yamini.v

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A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from pole of mirror , The size of image is approximate equal to :

asked Feb 19, 2014 by meena.p

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In the YDSE apparatus shown the ratio of maximum to minimum intensity on screen is 9. The wavelength of light used is $\lambda$, the value of y is :

asked Feb 19, 2014 by meena.p

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Four point charges $\;+8 \mu C\;,-1 \mu C\;,-1 \mu C\;and\;+8 \mu C\;$ are fixed at the points $\;-\sqrt{\large\frac{27}{2}} m \;,- \sqrt{\large\frac{3}{2}} m \;,+ \sqrt{\large\frac{3}{2}} m \;and\;+\sqrt{\large\frac{27}{2}} m\;$ respectively on the Y-axis . A particle of mass $\;6\times10^{-4} kg\;$ and charge $\;0.1 \mu C \;$ moves along the - X direction . It's speed at $\;x=+ \infty\;$ is $\;V_{0}\;. \quad \;$ Answer the following question based on the passage . Find the point on the x-axis where electric field is zero .

asked Feb 19, 2014 by yamini.v

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An object is placed at $ A\;(OA > f)$ Here, f is the focal length of the lens. The image is formed at B, A perpendicular is erected at 0 and C is chooses such that $\angle BCA =90^{\circ}$. Let $OA=a,OB=b$ and $OC=c$ then f is :

asked Feb 19, 2014 by meena.p

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Which is a product F of reaction

asked Feb 19, 2014 by sreemathi.v

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A charged particle enters a magnetic field with the velocity vector making a $45^{\circ}$ magnetic field. If the pitch of the helical path followed by the particle is $\wp$, its radius will be angle with the

asked Feb 19, 2014 by thanvigandhi_1

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A point object O is placed at a distance o 20cm from a convex lens of focal 10 cm as shown. At what distance x from lens should a concave mirror of focal length 60 cm can be placed so that final image coincides with object.

asked Feb 19, 2014 by meena.p

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In the below reaction only $CN^-$ ions are effective because

asked Feb 19, 2014 by sreemathi.v

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Net magnetic field at the centre of the circle $O$ due to a current carrying loop as shown in the figure for $ \theta < 180^{\circ}$ is

asked Feb 19, 2014 by thanvigandhi_1

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The dimensions of magnetic flux are

asked Feb 19, 2014 by thanvigandhi_1

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Optic axis of a thin equiconvex lens is the x-axis. The co-ordinates of a point object and its image are $(-40\;cm,1\;cm)$ and $(50\;cm,-2\;cm)$ respectively . lens is located at

asked Feb 19, 2014 by meena.p

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A charge $q$ moves along the $x$-axis with a velocity of 5 m/s in a uniform magnetic field $ \overrightarrow B = \hat i + \hat j + \hat k$ The force experienced by the charge will be

asked Feb 19, 2014 by thanvigandhi_1

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Refer the below reaction:

asked Feb 19, 2014 by sreemathi.v

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Which of the options represents Biot – Savart’s Law for a point charge particle Q moving with velocity $ \overrightarrow V$ ?

asked Feb 19, 2014 by thanvigandhi_1

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The product of below reaction:

asked Feb 19, 2014 by sreemathi.v

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A circular beam of diameter $d=2 \;cm$ falls on a plane surface of glass . The angle of incidence is $60^{\circ}$ and refractive index of glass is $ \mu=\large\frac{3}{2}$. The diameter of the refracted beam is ,

asked Feb 19, 2014 by meena.p

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In a region a horizontal electric field $E = 15N/C$ is present. A ball having charge $2C$ , mass $3kg$ and coefficient of restitution with ground $\;\large\frac{1}{2}\;$ is projected at an angle $\;30^{\circ}\;$ with the horizontal distance travelled by ball from first drop to the second drop

asked Feb 19, 2014 by yamini.v

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A concave mirror has a focal length 20 cm. The distance between the two positions of object for which the image size is double of object size.

asked Feb 19, 2014 by meena.p

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A convex lens forms a real image 3 times larger than the object on a screen. Object and screen are moved until the image becomes twice the size of object. If the shift of object is $6\;cm$ The shift of screen is :

asked Feb 19, 2014 by meena.p

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Given the scenario that follows, what will be $y$-coordinate of the particle when it collides with the screen? A particle having charge $q = 1C$ and mass = $1Kg$ is released from rest at the origin. The region has Electric and Magnetic fields given by: $E = 10 \hat I N/C$ for $x \leq 1.8m$ and $B = -5 \hat k T$ for $1.8m \leq x \leq 2.4m$. A screen is placed at $x = 3.0m$ parallel to the $y-z$ plane. Gravity is to be neglected.

asked Feb 19, 2014 by thanvigandhi_1

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Which of the following will be the best reagent for below transformation

asked Feb 19, 2014 by sreemathi.v

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A conducting ring of mass 2 Kg and radius $0.5m$ is placed on a smooth horizontal surface. The ring carries a current $i = 10A$. A horizontal magnetic field $B = 4T$ is now switched on. The angular acceleration of the ring will be

asked Feb 19, 2014 by thanvigandhi_1

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In YDSE $\large\frac{d}{D}$$=10^4$ (d= distance between slits ; D= distance of screen from slits). at a point P on screen resulting intensity is equal to intensity due to individual slit $I_0$ Then the distance of point P from central maximum is $(\lambda= 6000 A^{\circ})$

asked Feb 19, 2014 by meena.p

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Which of the following statements are correct ?

asked Feb 19, 2014 by sreemathi.v

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Refraction takes place at a concave spherical boundary separating glass air medium. For image to be real the object distance $(\mu g=\large\frac{3}{2})$

asked Feb 19, 2014 by meena.p

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Haloform reaction may be depicted as follows :

asked Feb 19, 2014 by sreemathi.v

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A 2 cm diameter coin rests flat on the bottom of a bowl in which water is 20 cm deep $(\mu_w= \large\frac{4}{3})$. If the coin is viewed directly from above what is its apparently diameter?

asked Feb 19, 2014 by meena.p

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Which of the following compounds exhibit Fehling's test?

asked Feb 19, 2014 by sreemathi.v

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Refer the below :

asked Feb 19, 2014 by sreemathi.v

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A plane mirror is made of glass slab $(\mu g=1.5)\;2.5\;cm$ thick and silvered on back. A point objected is placed 5 cm in front of unsilvered face of mirror. What will be the position of final image.

asked Feb 19, 2014 by meena.p

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In the below reaction the product Y is

asked Feb 19, 2014 by sreemathi.v

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At the distance of 5 cm and 10 cm from surface of a uniformly charged solid sphere , the potentials are 100 V and 75 V respectively . Then which of the following statements are correct $\; $ 1. Potential at it's surface is 150 V $\;$2.The charge on the sphere is $\;\large\frac{50}{3}\;\times 10^{-10}\;C$ $\;$3.Electric field on the surface is $\;1500 V/m\;$ $\;$4.Electric potential it's centre is 25V $\;\quad \;$

asked Feb 19, 2014 by yamini.v

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Magnetic moment of an electron in the $n^{th}$ orbit of the hydrogen atom is

asked Feb 19, 2014 by thanvigandhi_1

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