Recent questions tagged sec-b

Find k, if $f(x) = \left\{ \begin{array} {1 1} k \sin \frac{\pi}{2}(x+1), & \quad x \leq 0 \\ \frac{\tan x - \sin x}{x^3} ,& \quad x >0 \end{array} \right. $ is a continuous at x=0

asked May 27, 2016 by meena.p

1 answer

Differentiate $\tan ^{-1} \bigg( \large\frac{\sqrt{1+x^2}-\sqrt{1-x^2}}{\sqrt{1+x^2}+\sqrt{1-x^2}}\bigg)$ with respect to $ \cos ^{-1}x^2$

asked May 27, 2016 by meena.p

1 answer

Differentiate $(\sin 2x)^x+ \sin ^{-1} \sqrt {3x}$ with respected to x

asked May 27, 2016 by meena.p

1 answer

Light of wave length $5000A^{\circ}$ falls on a reflecting surface . What are the wave length and frequency of the reflected light ? For what angle of incidence is the reflected ray normal to the incident ray ?

asked May 26, 2016 by meena.p

1 answer

A beam of light consisting of two wave length 650 nm and 520 nm, is used to obtain interference finger in a young's double slit experiment . What is the least distance from the central maximum ? Where the bright fringer due to both wavelength coincide ?

asked May 26, 2016 by meena.p

1 answer

A beam of light consisting of two wave length 650 nm and 520 nm, is used to obtain interference finger in a young's double slit experiment . Find the distance of the third bright fringe on the screen from the central maximum for wave length 650 nm

asked May 26, 2016 by meena.p

1 answer

In yang's double slit experiment , the slit are separated by $0.25$ mm and the screen is placed 1.4 m away. The distance the control bright fringe and the fourth bright fringe is measured to be 1.2 cm determine the wave length of light used in the experiment

asked May 26, 2016 by meena.p

1 answer

Monochromatic light of wavelength $589\;nm$ is incident from air on a water surface. What is the wave length frequency and speed of reflected light ? $\mu=1.33$

asked May 26, 2016 by meena.p

1 answer

One face of a prism is silvered and if refracting angle $30^{\circ}$ and refracting index 1.414 is silvered . At what angle must a ray of light fall on the silvered surface so that after refraction into prism and reflection at the silvered surface it retrace the path ?

asked May 25, 2016 by meena.p

1 answer

A thin convex lens of focal length 25 cm is cut into two pieces 0.5 cm above the principal axis . The top part is placed at $(0,0) $ and an object at $(-50 cm, 0)$. Find the coordinate axis ?

asked May 25, 2016 by meena.p

1 answer

For a glass prism $(\mu=\sqrt 3)$ the angle of minimum deviation is equal to the angle of the prism . Find the angle of the prism .

asked May 25, 2016 by meena.p

1 answer

The immiscible liquids of densities $d_1 > d_2 > d_3$ and refractive indices $\mu_1 > \mu_2 > \mu_3$ are put in a beaker . The height of each liquid column is $\large\frac{h}{3}$. A dot is made at the bottom of the beaker . For near normal vision, find the apparent depth of the dot .

asked May 25, 2016 by meena.p

1 answer

The radius of culvature of the curved surface of a plano - convex lens is 20 cm . If the refractive index of the material of the lens be 1.5 , it will

asked May 24, 2016 by meena.p

1 answer

You are given four sources of light each one providing a light of a single colour - red, blue , green , and yellow . Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is $90^{\circ}$ Which of the following statement is correct if the source of yellow light is replaced with that of other lights without changing the angle of incident ?

asked May 24, 2016 by meena.p

1 answer

Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards .A current in the coil produces a defection of $35^{\circ}$ of the mirror . What is the displacement of the reflected spot of light on ascreen 1.5 m away ?

asked May 24, 2016 by meena.p

1 answer

An angular magnification (magnifying power ) of 30 x is desired using an objective of focal length 1.25 cm and an eye piece of focal length 5 cm. How will you set up the compound microscope ?

asked May 23, 2016 by meena.p

1 answer

When viewing through a compound microscope our eyes should be positioned not on the eye piece, but a short distance away from it for best viewing , why ? How much should be the short distance between the eye and the eyepiece ?

asked May 23, 2016 by meena.p

1 answer

What should be the distance between the object and magnifying glass (converging lens of focal length 10 cm) if the virtual image of each square is to have an area of $6.25 mm^2$, would you be able to see the square distinct with your eyes very close to magnifier ?

asked May 23, 2016 by meena.p

1 answer

A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held close to the eye. At what distance should the lens be held from the card sheet in order to view the squares distinct with the minimum possible magnifying power ? Is the magnification equal to the magnifying power in this case ? explain

asked May 20, 2016 by meena.p

1 answer

A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held close to the eye. At what distance should the lens be held from the card sheet in order to view the squares distinct with the minimum possible magnifying power ? What is the magnification in this car ?

asked May 20, 2016 by meena.p

2 answers

A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held . close to the eye. Is the magnification same as the magnifying power ? explain

asked May 20, 2016 by meena.p

1 answer

A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held . close to the eye. What is the magnification produced by the lens ? How much is the area of each square in the virtual image ?

asked May 20, 2016 by meena.p

1 answer

A man with normal near point (25 cm) reads a book with small print using a magnifying glass a thin convex less of focal length 5 cm what are the closest and farthest distance at which he can read the book , When viewing through the magnifying glass? What is the maximum and the minimum angular magnification possible using the above simple microscope ?

asked May 20, 2016 by meena.p

1 answer

A man with normal near point (25 cm) reads a book with small print using a magnifying glass a thin convex less of focal length 5 cm what are the closest and farthest distance at which he can read the book , When viewing through the magnifying glass?

asked May 20, 2016 by meena.p

1 answer

For a normal eye, the far point is at infinity and the near point of distinct vision is about 25 cm in front of the eye. The cornea of the eye provides a converging power of about 40 diepter and the least converging power of eye lens behind the cornea is about 20 dioptre. From this rough data, estimate the range of accommodation of normal eye .

asked May 18, 2016 by meena.p

1 answer

A cross section of a light pipe made of a glass fibre of refractive index 1.68 . The outer covering of the pipe is made of material of refractive index 1.44 . What is the answer if there is no outer using of the pipe ?

asked May 13, 2016 by meena.p

1 answer

use the mirror equation to deduce that a convex mirror always produces a virtual image independent of the location of the object.

asked May 13, 2016 by meena.p

1 answer

A giant refracting telescope at an observatory has an objective lens of focal length 1.0 cm is used , what is the angular magnification of the telescope ? if this telescope is used to view the moon, what is the diameter of the image of the moon formed by this objective lens? The diameter of the moon is $3.48 \times 10^6 \;m$ and radius of the lunar orbit is $3.8 \times 10^8\;m$

asked May 12, 2016 by meena.p

1 answer

A small telescope has an objective terms of focal length $144\;cm$ and an eye -piece of focal length $6.0\;cm$ . What is the magnifying power of the telescope ?What is the seperation between the objective and the eyepiece ?

asked May 12, 2016 by meena.p

1 answer

A compound microscope consists of an objective less of focal length $2.0\;cm$ and an eye -piece of focal legth $6.25\;cm$ , separated by a distance of 15 cm . How far from the objective should an object be placed in order to obtain the final image at the least distance of distinct vision (25 cm) .

asked Mar 3, 2016 by meena.p

1 answer

A beam of light coverage to a point P. A lens is placed in the path of the convergent beam 12 cm from P. At what point does the beam converge if the lens is a concave lens of focal length 16 cm ?

asked Feb 17, 2016 by meena.p

1 answer

A beam of light coverage to a point P. A lens is placed in the path of the convergent beam 12 cm from P. At what point does the beam converge if the lens is to be 20 cm ?

asked Feb 17, 2016 by meena.p

1 answer

Double convex lenses are to be manufacture from a grass of refractive index 1.55 , with both a glass of refractive index 1.55 with both faces of same radius of curvature . What is the radius of curvature required if local length of lens is to be 20 cm ?

asked Feb 17, 2016 by meena.p

1 answer

A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. By rotating the prism the minimum angle of deviation is measured to be $40 ^{\circ}$ What is the refractive index of the prism ?

asked Feb 15, 2016 by meena.p

1 answer

A placed bulb is placed at the bottom of a tank containing water to a depth of 80 cm. What is the area of the surface of water through which light from the bulb can emerge out ? Refractive index of water is 1.33 consider the bulb to be a point source .

asked Feb 15, 2016 by meena.p

1 answer

A 4.5 cm needle is placed away from a convex mirror of focal length 15 cm . give the location of the image and the magnification .

asked Feb 10, 2016 by meena.p

1 answer

A small candle 2.5 cm in size is placed 27 cm in front of a concave mirror of radius of curvature 36 cm. If the candle is moved closer to the mirror, how would the screen have to be moved ?

asked Feb 10, 2016 by meena.p

1 answer

A small candle 2.5 cm in size is placed 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in order to receive a sharp image ? Describe the nature and size of the image ?

asked Feb 10, 2016 by meena.p

1 answer

Condensation product of caprolactum

asked Dec 21, 2015 by meena.p

1 answer

2-Acetoxy benzoic acid is used as an :

asked Dec 21, 2015 by meena.p

1 answer

Benzene diazonium chloride on hydrolysis gives,

asked Nov 23, 2015 by meena.p

1 answer

When Sodium benzonole is heated with soda lime we get,

asked Nov 23, 2015 by meena.p

1 answer

The emf of a cell containing sodium / copper electrodes is $3.05\;V$ , if the electrode potential of copper electrode is $0.34\;V$ , the electrode potential of sodium is

asked Sep 21, 2015 by meena.p

1 answer

The charge required to deposit 9 g of $Al$ from $Al^{3+}$ solution is (At wt of AI=27.0)

asked Sep 21, 2015 by meena.p

1 answer

One mole of sugar is dissolved in two moles of water. the VP of the solution relative to that of pure water is

asked Sep 16, 2015 by meena.p

1 answer

A compound formed by element A and B crystallizes in the cubic. Structure where A atoms are at the coiners of the cube and B atoms are at face centers. The formula of the compound is

asked Sep 8, 2015 by meena.p

1 answer

What happens when a ferromagnetic solid is heated ?

asked Sep 7, 2015 by meena.p

1 answer

A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because

asked Sep 7, 2015 by meena.p

1 answer

A compound contains two types of atoms x and y , it crystallizes in a cubic lattice with atoms X at the corners of the unit cell and atoms y at the body centers . The simplest possible formula of this compound is

asked Sep 4, 2015 by meena.p

1 answer

A galvanometer with a coil resistance $12 \Omega$ shows a full scale deflection for a current $2.5\;mA$ How will you convert it into a voltmeter of range $7.5 \;V$ Also find the total resistance of Voltmeter formed ?

asked Aug 5, 2015 by meena.p

1 answer

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