Recently Active Physics Questions

1.A young's double slit expt is performed with white light,then A)The central fringe will be white B)There will not be a completely dark fringe C)The fringe next to the central will be red D)The fringe next to the central wil ...

Two circular rings A and B each of radius a=30cm are placed coaxially with their axes horizontal in a uniform electric field E=10^5 N/C directed vertically upwards.distance between the centres of these rings A and B is h=40 c ...

pls give me a detaild explanation abt sign convention for the pbm. 1)Two equiconvex lenses of focal lengths 30 cm and 70 cm,made of material of refractive index=1.5; are held in contact coaxially by a rubber band round their ...

A block of mass 1kg is pushd against a rough vertical wall with a force 20N coefficient of static friction being 1/4;Another horizontal force of 10 N is applid on the block in a direction parallel to the wall.Will th block mo ...

In the given figure , a smooth parabolic wire lies in the vertical (x-y plane) .The shape of the given track is defined by the equation y=x2/a(a is a constant ) .A ring of mass of which can slide freely on the wire track,is p ...

1 mole of a gas xpands with temperature T such dat its volume V=kT2 where k is a constant if d temperature of d gas changs by 60° den find d work done by d gas ? a gas has molar heat capacity C=37.35Jmol^-1 K^-1 in d process ...

a hollow sphere[inner radius r and outer radius R] and sphere of radius R are heated to same temperature ,which will cool faster and why ? ...

An aluminium sphere is dipped into water at 100C.If the temperature is increased ,the force of buoyancy 1)will increase 2)will decrease 3)will remain constant 4)may increase or decrease depending on the radius of the sphere. ...

AN IDEAL MONOATOMIC GAS AT NTP IS ENCLOSED IN AN ADIABATIC VERTICAL CYLINDER BETWEEN TWO LIGHT MOVABLE PISTONS (ONE UP AND ONE DOWN). SPRING WITH FORCE CONSTANT K IS CONNECTED TO THE UPPER PISTON AND IS IN A RELAXED STATE INI ...

1.A metre scale made of steel reads accurately at 20degrees C. In a sensitive experiment distances accurate upto 0.055mm in 1m are required. Find the range of temp in which the experiment can be performed with this metre scal ...

*Image* 1. a ball is allowed to fall from a height of 10 metre. if there is 40% loss of energy due to impact then after one impact ball will go upto a, 10 b. 8 c.6 d. 4 2. a particle is projected with kinetic energy k. its ra ...

calculate the magnetic induction at a point 1 Angstrom away from a proton , measured along its axis of spin. magnetic moment of proton is 1.4 x 10^ -26 A-m^2 ...

1.A 20N block is suspended by a spring balance.A beaker containing some water is placed on a weighing machine which reads 40N.The the spring balance is lowered inside the water such that the block is fully immersed.The spring ...

a satellite is in a circular orbit very close to the surface of a planet. at some point it is given an impulse along its direction of motion, causing the vel to increase by μ times. it now moves in an elliptical orbit with t ...

(A) : When a body is connected to earth,all its charge flows to earth and it becomes electrically neutral. (R) : Electric potential of earth is zero,so the body connected to earth should also attain zero potential. ...

a balll of density ρ0 falls from rest from a point P onto the surface of a liquid of density ρ in time T. It enters the liquid, stops, moves up n returns to P in a total time 3T. Neglect the viscosity, surface tension and s ...

1.Two strings A and B ,of same material and Ra=2Rb,are stretched by the same tension.Transverse waves travel thru these strings,find the ratio of their velocities va/vb 2.HC Verma in his book mentions velocities of 2 interfer ...

A Large spherical shell(radius r, charge q) rotating with angular velocity is placed in gravity-free space, having uniform magnetic field, suc that its direction is perpendicular to the axis of rotation. If the mass of shell ...

A Li7 target is bombarded with a proton beam current of 10-4A for 1 hour to produce Be7 with an activity of 1.8 *108 disintegrations per second . assuming that one Be radioactive nucleus is produced by 1000 protons bobarding ...

1.A body is suspended from a spring balance kept in a satellite,when orbit radius =R,reading = W1,when orbit = 2R,reading = W2 then A)W1=W2 B)W1W2 ans:(a) 2.Suppose a tunnel is dug thru the centre of the earth , and a particl ...

*Image* A wire of length l has current i apply amperes law ∫B.dx=μi B.2pir=μi B=μi/2πr ...(:P same as of infinite wire.) But we know it should be B=μi(sinα+sinβ)/4πr Explain what is wrong.. [3] ...

The angular velocity of the wheels of a scooter is directly proportional to the petrol input.The scooter is moving on a frictionless road with uniform velocity. If the input is increased by 50%,what is the change in linear ve ...

Paragraph for Question Nos. 41 to 43 The distance between the objective and the eyepiece in a microscope set in a horizontal direction is 12 cm and their respective focal lengths 0.6 cm and 5 cm. If a clear image is to be obt ...

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*Image* Block A is almost massless.and velocity is given to (mass=1kg) v= 8gH Find acceleration of A at initial instant. ...

*Image* the battery of volatge V=10 V .. three capacitors each of 3μF and 5 resistors each of 1Ω are aranged as shown in the fig. arrangement is left for long time so that steady state is reached. then: 1) charge on cap 1 2 ...

*Image* The left side of the plane has 0 potential and right has a positive potential. a positive charge is incident at boundary as shown with sufficient velocity as to enter right region. The excepted path in right side is I ...

metallic plates P(collector) & Q(emitter) are separated by a distance of 0.10m. These r connected through an ammeter without any cell. a magnetic field B exists parallel to the plates. light of wavelengths between 400nm & 60n ...

p.d = V is applied between 2 coaxial conducting pipes of radii a and b , with b>a. the pipes are made of non magnetic material. a long straight wire current I is fixed along the axis of the 2 pipes. an electron leaves the ...

A ray of light is incident on a rotating plane mirror. If angular speed of mirror is w, what is the angular speed of the reflected ray? ...