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Recent questions tagged physics
Questions
Find the maxima and minima obtained on screen in a $YDSE, D= 1m,d=1mm$ and $ \lambda=\large\frac{1}{2}\;mm$
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
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?
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
easy
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
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
The product of resistivity and conductivity of a conductor with uniform cross-section depends on
jeemain
physics
current-electricity
cbse
class12
ch5
resistivity
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
As the temperature of a metallic conductor is increased, the product of resistivity and conductivity
jeemain
physics
current-electricity
cbse
class12
ch5
resistivity
easy
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:
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
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
jeemain
physics
current-electricity
cbse
class12
ch3
q79
easy
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
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
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
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
difficult
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:
jeemain
physics
current-electricity
cbse
class12
ch5
kirchoffs-law
easy
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 )
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
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
jeemain
physics
current-electricity
cbse
class12
ch5
resistivity
easy
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
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
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.
jeemain
physics
class12
unit16
wave-optics
addition-of-waves
medium
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
jeemain
physics
current-electricity
cbse
class12
ch5
kirchoffs-law
medium
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
jeemain
physics
class12
unit16
wave-optics
addition-of-waves
easy
aims-12-physics
asked
Feb 13, 2014
by
meena.p
1
answer
Current in the $3\: ohm$ resistor is
jeemain
physics
current-electricity
cbse
class12
ch5
kirchoffs-law
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
The equivalent resistance between the points A and B is:
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
difficult
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
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Feb 13, 2014
by
yamini.v
1
answer
If $i= 3 \sin tw$ and $i_2= 4 \cos wt$ find $i_3$
jeemain
physics
class12
ch5
current-electricity
kirchoffs-law
easy
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 :
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
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 :-
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
The focal length of a Plano convex lens when plane surface is silvered and object is in front of curved surface is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
Two convex lenses of focal length 20 cm are placed co axially with separation of 60 cm between them. Find image of distant object.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 12, 2014
by
meena.p
1
answer
Convex lens of 10 cm focal length is combined with a concave lens of 6 cm focal length. Find focal length of combination.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
easy
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 .
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
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 $_a \mu_g =\large\frac{3}{2}$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
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
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
easy
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
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
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.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
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
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
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
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
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 $refractive index \;1.36$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
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.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
rafraction-at-sphericalsurfaces-and-lenses
difficult
asked
Feb 12, 2014
by
meena.p
1
answer
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 $\;(x > > a)$
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
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
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
difficult
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
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
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 )
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
difficult
asked
Feb 12, 2014
by
meena.p
1
answer
A uniform electric field of strength $\;\overrightarrow{E}\;$ exists in a region . An electron enters a point $A$ with velocity $v$ as shown . It moves through the electric field and reaches at point $B$ . Velocity of particle at $B$ is $2v$ at $30^{\circ}\;$ with x - axis . Then electric field $\;\overrightarrow{E}\;$ is
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
asked
Feb 12, 2014
by
yamini.v
1
answer
Calculate the dispersive power for crown glass from given data. $\mu_v= 1.523 $ and $\mu_R=1.5145$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
medium
asked
Feb 12, 2014
by
meena.p
1
answer
Find the dispersion produced by a thin prism of $18^{\circ}$ having refractive index fro red light $= 1.56$ and for violet light $=1.68$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
medium
asked
Feb 12, 2014
by
meena.p
1
answer
In the diagram shown , the charge +Q is fixed another charge +2q and mass M is projected from a distance R from the fixed charge . Minimum separation between the charges if the velocity becomes $\;\large\frac{1}{\sqrt{3}}\;$ times of the projected velocity , at this moment
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
force-between-multiple-charges
difficult
asked
Feb 12, 2014
by
yamini.v
1
answer
What should be the value of refractive index n of a glass rod placed in air, so that the light entering through the flat surface of rod does not cross the curved surface of rod.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
asked
Feb 12, 2014
by
meena.p
1
answer
Figure shows two conducting thin concentric shells of radii r and 3r . The outer shell carries charge q . Inner shell is neutral . Find the charge that will flow from inner shell to outer after the switch S is closed .
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 12, 2014
by
yamini.v
1
answer
An electric dipole of dipole moment P is placed in a uniform electric field E in stable equilibrium position . It's moment of inertia about the centroidal axis is I . If it is displaced slightly from it mean position find the period of small oscillations .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
difficult
asked
Feb 12, 2014
by
yamini.v
1
answer
What should be the value of angle $\theta$ so that light entering normally through the surface AC of a prism of refractive index $(n= \large\frac{3}{2})$ does not cross the second refracting surface AB.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
medium
asked
Feb 12, 2014
by
meena.p
1
answer
Find angle of refraction in a medium $(\mu =2)$ . If light is incident in vacuum making angle equal to twice the critical angle.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Feb 12, 2014
by
meena.p
1
answer
Find maximum angle that can be made in glass medium $(\mu =1.5)$ if a light ray is refracted from glass to vacuum.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Feb 11, 2014
by
meena.p
1
answer
Find lateral shift of light ray while is passes through a parallel glass slab of thickness 10 cm placed in air.The angle of incidence in air is $60^{\circ}$ and angle of refraction in glass is $45^{\circ}$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Feb 11, 2014
by
meena.p
1
answer
A layer of oil 3 cm thick is floating on a layer of colored water 5 cm thick refractive index of colored water is $\large\frac{5}{3}$ and apparent depth of two liquids appears to be $\large\frac{36}{7}$cm. Then refractive index of oil:
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Feb 11, 2014
by
meena.p
1
answer
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