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Three charged particles ( their sign sare shown ) move along the path in a uniform electric fiel as shown . In each of three cases state whether the potential energy increases of decreases ?

During total solar eclipse, the spectrum of the sunlight observed is

A metal surace objects electrons when hit by green light but none when hit by yellow light .The electrons will be ejected when the surface is hit by…….

A point P moves in counter-clockwise direction on a circular path as shown in the figure. The movement of 'P ' is such that it sweeps out a lengths=t ^ 3+5where s isinmetersandtisinseconds.Theradiusofthepathis20m.The acceleration of ' P ' when t = 2 s is nearly:

In Sun, the important source of energy is

Hydrogen atoms are in an excited state with n = 5. In terms of the Bohr's model, (a) how many spectral lines can be radiated as these atoms return to be ground state? (b) Find the energies of the line with the longest and shortest wavelengths.

Aseries resonance LCR A.C. , circuit is called:

Draw a ray diagram to show image formation for a (Cassegrain) reflecting telescope. What is its magnifying power ?

About how many times more intense will the normal ear perceive a sound of 10^(-6)W//m^2? than one of 10^(-9) W//m^2 ?

A dipole of dipole moment vec(P) = P_(o) hat(j) is placed at point (l,0). There exists an electric field vec(E)=2ax^(2)hat(i)+(2by^(2)+2cy)hat(j). Then

A small sphere of mass m and having charge q is suspended by a light thread.

The adjoining figure shows a long straight wire of a circular cross section (radius a) carrying steady current I. The current I is uniformly distributed across its cross section. Calculate the magnetic field at a distance from its axis for (i) r lt a , (ii) r gt a .

Ultraviolet radiation of 6.2 e V falls on an aluminium surface (work function 4.2 e V). The kinetic energy in Joule of the fastest electron emitted is approximately :

A diminished image of an object is to be obtained on a screen 1.0 m from it. This can be achieved by appropriately placing

If the hydrogen atom is initially at n = 2 state, how much work have to do to move the electron and proton far into the hydrogen atom?

Two blocks of masses 10 kg and 4 kg are connected by a negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14 m/s to the heavier block in the direction of the lighter block. The velocity of the centre of mass is :

(A): However long a fuse wire may be, the safe current that can be allowed is the same through it. (R): The safe current that can be allowed to pass through a fuse wire depends on the radius of wire.

A ball is dropped from height of Im. If coefficient of restituion between surface and ball is 0.6. The ball rebounds to a height of:

What is the number of electrons which constitutes a current of one ampere ?

Att the magnetic materials lose their magnetic properties , when :

If capacitor of 60muF has charge of 3xx10^4C on each plate in coulomb. Then the energy, stored is :

Mention the principle behind the working of a transformer. Can a transformer used to step up a d.c. voltage ?

A proton, a deuteron and an a-particle have same kinetic energies. Their velocities are in the ratio of:

A conductor is moved at right angles to a magnetic field, will an emf be induced between the ends of the conductor ?

If W_(1), W_(2) and W_(3) represent the work done in moving a particle from A to B along three different paths 1, 2 and 3 respectively(as shown) in a gravitational field of point mass m, then

A charge Q_(0) is placed at the center of spherical cavity of a conductor and another charge Q is placed outside the conductor as shown in the figure. The correct statement is :

Assertion (A): The alloys manganin and constant on are used to make standard resistors.Reason (R) : Resistivity of nichrome is maximum amongst all alloys.

A star emitting light of 5000 Å is receding away from earth with a velocity of 300 km/s. the apparent wavelength of light is :

A telescope has a magnification equal to 5 and the length of its tube is 60 cm. The focal length of its eye piece is

At a certain voltage applied to an X-rays tuve with aluminium anticathode the short-wave cut-off wavelength of the continuous X-rays spectum is equal to 0.50nm. Will the K series of the characteristic specturm whose excitation potential is equal to 1.56kV be also observed in this case?

A tuning fork vibrates and produces concentric circular transverse wave on the surface of water. If distance between 10 crests is 9.0m and velocity of the wave on the surface of water is 450m/s, what is frequency of the tuning fork ?

Arigid circular loop of radius r nnd mass m lies in the x - y plane on a flat table and has a current i flowing in it. At this is particular place , the earth's magnetic field is B = Bxhati + Bzhatk. The value of i so that one edge of the loop lifts from the table is

As the quantum number increases, the difference of energy between consecutive energy leveles

A double-slit experiment is immersed in a liquid of refractive index 1.33. The separation between the slits is 1mm and the distance between the slits and screen is 1.33 m. If slits are illuminated by a parallel beam of light whose wavelength is 6300 Å, then fringe width will be

The half-life period of a radioactive element X is same as mean life of another radioactive element Y. Initially they have same no. of atoms, then:

For increasing the sharpness of resonance in a LCR series a.c. circuit, the presence in the circuit should be minimum.

Describe Young's slit experiment to produce interference pattern due to a monochromatic source of light. Deduce the expression for the fringe width.

A uniform electric field is prevailing in X- direction in certain region. The Co-ordinates of points P, Q and R are (0, 0), (2, 0), (0, 2) respectively which of the following alternatives is true for the potentials at these points ?

Two coherent sources S_1" and "S_2 produce interference fringes. If a thin mica plate is introduced in the path of light from S_(1) then the central maximum

Monochromatic light of wavelength 589 nm is incident from air on water surface. If the R.l. of water is 1.33, the frequency of refracted light is:

The resistance R of a conductor depends on its length l,area of crossection A and resistivity p of the meterial.Write an expression connecting R,I, A and rho.

Two circular coils of radii 20 cm and 30cm having number of turns 50 and 100 made of same material are connected in series. The ratio of the magnetic field of induction at their centres is

If a ray of light is incident from rarer medium at an angle 45° on the surface which separates two medium having refractive indices 1 and sqrt(2) for rarer and denser medium, then angle of deviation of refractive ray with incident ray is