Recent questions in Physics

In a YDSE with $D= 1m,d=1mm$ light of wave length $500 \;nm$ is incident at an angle of $0.57^{\circ}$ with respect to axis of symmetry of experimental set up. If centre of symmetry of screen is 0. Then the intensity at point 0 in terms of intensity of central maxima $I_0$ is

asked Feb 13, 2014 by meena.p

1 answer

A charged +Q is uniformly distributed in a spherical volume of radius R . A particle of charge +q and mass m projected with velocity $\;v_{0}\;$ from the surface of the spherical volume to its centre inside a smooth tunnel dug across the sphere . The minimum value of $\;v_{0}\;$ such that it just reaches the centre of the spherical volume is

asked Feb 13, 2014 by yamini.v

1 answer

Let C be the capacitance of a capacitor discharging through a resistor R. Suppose t1 is the time taken for the energy stored in the capacitor to reduce to half its initial value and t2 is the time taken for the charge to reduce to one-fourth its initial value. Then the ratio $ \large\frac{t1}{t2}$ will be

asked Feb 13, 2014 by thanvigandhi_1

1 answer

In a YDSE with $d= 1mm$ and $D= 1m$ slabs of $(t= 1 \mu m , \mu =3)$ and $(t=0.5\;\mu m , \mu =2) $ are introduced in front of upper and lower slit respectively . Then the shift in fringe pattern is :-

asked Feb 13, 2014 by meena.p

1 answer

The current through the battery is

asked Feb 13, 2014 by thanvigandhi_1

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White light is used in a YDSE with $D= 1m$ and $d= 0.9 mm$ .Light reaching the screen at position $y= 1 mm$ is passed through a prism and its spectrum is obtained. The missing lines in the visible region of this spectrum is :-

asked Feb 13, 2014 by meena.p

1 answer

Monochromatic light of wavelength $5000\;A^{\circ} $ is used in Y.D.S.E with slit- width $d= 1 mm$distance between screen and slits $D=1\;m$ Find the distance of 1000 th maxima

asked Feb 13, 2014 by meena.p

1 answer

The net resistance between the points A and B is

asked Feb 13, 2014 by thanvigandhi_1

1 answer

In the circuit shown in the figure, reading of the voltmeter is V1 when only S1 is closed, V2 when only S2 is closed and V3 when both S1 and S2 are closed. Then

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Monochromatic light of wavelength $5000\;A^{\circ} $ is used in Y.D.S.E with slit- width $d= 1 mm$distance between screen and slits $D=1\;m$ .Then the distance of 5th minima from central maxima on screen is :-

asked Feb 13, 2014 by meena.p

1 answer

A particle of mass m and charge q is fastened to one end of a string of length l . The other end of the string is fixed to the point O . The whole system lies on a frictionless horizontal plane . Initially , the mass is at rest at A . A uniform electric field in the direction shown is the switched on . Then speed of the particle at B and tension in the string are

asked Feb 13, 2014 by yamini.v

1 answer

When no current passes through a conductor

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Find the maxima and minima obtained on screen in a $YDSE, D= 1m,d=1mm$ and $ \lambda=\large\frac{1}{2}\;mm$

asked Feb 13, 2014 by meena.p

1 answer

Suppose you have three variable resistors each of range 15 ohms to 30 ohms. Which of the following values of equivalent resistance cannot be obtained using these 3 variable resistors?

asked Feb 13, 2014 by thanvigandhi_1

1 answer

A uniform wire of resistance $100\: ohms$ is cut into 10 equal parts and are connected in parallel to each other. The equivalent resistance of the combination is

asked Feb 13, 2014 by thanvigandhi_1

1 answer

The product of resistivity and conductivity of a conductor with uniform cross-section depends on

asked Feb 13, 2014 by thanvigandhi_1

1 answer

As the temperature of a metallic conductor is increased, the product of resistivity and conductivity

asked Feb 13, 2014 by thanvigandhi_1

2 answers

A current passes through a resistor. Let K1 and K2 be the average kinetic energy of the conduction electrons and metal ions respectively. Then:

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Two resistors R and 2R are connected in series in a circuit. The thermal energy developed in R and 2R are in the ratio

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Two resistors R and 2R are connected in parallel in a circuit. The thermal energy developed in R and 2R are in the ratio

asked Feb 13, 2014 by thanvigandhi_1

1 answer

In a YDSE, $D = 1m \; d= 1mm$ and $\lambda =\large\frac{1}{2}$$mm$ Then the distance between the first and central maxima on screen

asked Feb 13, 2014 by meena.p

1 answer

Consider the following two statements \[\] (A) Kirchhoff’s junction law follows from conservation of charge \[\] (B) Kirchhoff’s loop law follows from the conservative nature of electric field \[\] Then which of the following is true:

asked Feb 13, 2014 by thanvigandhi_1

1 answer

A charge q is placed at O in the cavity in a spherical uncharged conducter . Point S is outside the conducter . If q is displaced from O towards S (still remaining with in the cavity )

asked Feb 13, 2014 by yamini.v

1 answer

Two resistors A and B have their resistances $R_A\: and\: R_B$ with $R_A\: >\: R_B$. The resistivities of their material are related by

asked Feb 13, 2014 by thanvigandhi_1

1 answer

A metallic resistor is connected across a battery. If the number of collisions of free electrons with the lattice is somehow decreased in the resistor, the current will

asked Feb 13, 2014 by thanvigandhi_1

2 answers

Light from two sources , each of same frequency and travelling in same direction. but with intensity in ratio 4:1 interface. Find ratio of maximum to minimum intensity.

asked Feb 13, 2014 by meena.p

1 answer

In the circuit shown, potential difference between the points A and B is $16V$. The current passing through the $2\Omega$ resistor will be

asked Feb 13, 2014 by thanvigandhi_1

1 answer

$S_1$ and $S_2$ are two sources of light which produce individually disturbance at a point P given by $\in _1=3 \sin wt,\;\in _2 =4 \cos wt$ Assuming $\overrightarrow {\in_1}$ and $\overrightarrow{\in_2}$ to be along the same line then result of their superposition is

asked Feb 13, 2014 by meena.p

1 answer

Current in the $3\: ohm$ resistor is

asked Feb 13, 2014 by thanvigandhi_1

1 answer

The equivalent resistance between the points A and B is:

asked Feb 13, 2014 by thanvigandhi_1

1 answer

The curve represents the distribution of potential along the straight line joining the two charges $\;Q_{1}\;$ and $\;Q_{2}\;$ (separated by a distance r ) then which of the following are correct 1. $\;|Q_{1}| > |Q_{2}|\;$ 2. $\;Q_{1}\;is\;+ve\;$ 3. $\;A\;$ and $\;B\;$ are equibrium points 4. $\;C\;$ is point of unstable equilibrium

asked Feb 13, 2014 by yamini.v

1 answer

If $i= 3 \sin tw$ and $i_2= 4 \cos wt$ find $i_3$

asked Feb 13, 2014 by meena.p

1 answer

A pin is placed $10 cm$ in front of a convex lens of focal length $20 cm$ made of a material having refractive index $1.5$. The surface of lens is further away from P in is silvered and has a radius of curvature $22 \;cm$ Then position of final image will be :

asked Feb 13, 2014 by meena.p

1 answer

The focal length of a Plano convex lens when curved surface is silvered and object is in front of plane surface is :-

asked Feb 13, 2014 by meena.p

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The focal length of a Plano convex lens when plane surface is silvered and object is in front of curved surface is

asked Feb 13, 2014 by meena.p

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Two convex lenses of focal length 20 cm are placed co axially with separation of 60 cm between them. Find image of distant object.

asked Feb 12, 2014 by meena.p

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Convex lens of 10 cm focal length is combined with a concave lens of 6 cm focal length. Find focal length of combination.

asked Feb 12, 2014 by meena.p

1 answer

Find the electric field caused by a disc of radius "a" with a uniform charge density $\;\sigma\;$ , at a point along the axis of the disc a distance x from its centre .

asked Feb 12, 2014 by yamini.v

1 answer

A lens has a power of +5 diopters in air. What will be power if completely immersed in water? $_a \mu_w =\large\frac{4}{3}$ and $_a \mu_g =\large\frac{3}{2}$

asked Feb 12, 2014 by meena.p

1 answer

A convergent lens of 6 diopters is combined with a diverging lens of -2 diopters.Then the power and focal length is

asked Feb 12, 2014 by meena.p

1 answer

Consider a spherical surface of radius 4m centred at the origin . Point +q and -2q are fixed at points $\;A (2m , 0 , 0)\;$ and $\;B (8m , 0 ,0)\;$ respectively . The potential on the surface of sphere is

asked Feb 12, 2014 by yamini.v

1 answer

An object is placed at an of 45 cm from a converging lens of focal length 30 cm . A mirror of radius of curvature 40 cm is to be placed on other side of lens so that the object coincides with its image. Find the distance of mirror from lens if mirror is convex.

asked Feb 12, 2014 by meena.p

1 answer

An object is placed at a distance of 10 cm to left on axis of a convex lens A of focal length 20 cm.Another convex lens of focal length 10 cm is placed co-axially to the right of the lens A at a distance of 5 cm from A. Find the magnification of final image

asked Feb 12, 2014 by meena.p

1 answer

A solid conducting sphere of radius a having a charge q is surrounded by a concentric conducting spherical shell of inner radius 2a and outer radius as shown in figure . Find the amount of heat produced when switch is closed

asked Feb 12, 2014 by yamini.v

1 answer

A glass convex lens of refractive index $\large\frac{3}{2}$ has got a focal length equal to $50 \;cm$ Find the focal length of lens if it is immersed in ethyl alcohol of $refractive index \;1.36$

asked Feb 12, 2014 by meena.p

1 answer

A parallel beam of light travelling in water $(\mu =\large\frac{4}{3})$ is refracted through a spherical air bubble of radius R .. Find the location of image formed after refraction at two surfaces.

asked Feb 12, 2014 by meena.p

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Six charges are placed at the certices of a regular hexagon as shown in the figure . The electric field on the line passing through point O and perpendicular to the plane of the figure as a function of distance x from point O is $\;(x > > a)$

asked Feb 12, 2014 by yamini.v

1 answer

A prism of crown glass refracting angle of $50^{\circ}$ and mean refractive index $=1.51$ is combined with one flint glass prism of refractive index $=1.65$ to produce no deviation Then the angle of flint glass is

asked Feb 12, 2014 by meena.p

1 answer

Two point charges a and b whose magnitudes are same positioned at a certain distance along the positive x-axis from each other . a is at origin and b is at a distance $\;x_{0}\;$ from a . Graph is drawn between electrical field strength and distance x from a . E is taken positive if it is along the line joining from a to b . Then

asked Feb 12, 2014 by yamini.v

1 answer

The dispersive power of crown and flint glasses are 0.03 and 0.05 respectively . If difference in refractive indices of blue and red colours is 0.014 for crown glass and 0.023 for flint glass . Then the angle of two prisms for a deviation of $10^{\circ}$ (with out dispersion )

asked Feb 12, 2014 by meena.p

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