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According to Huygen's construction, each point of secondary wavefront will emit the light waves of

What is the function of a solar cell? Briefly explain its working and draw its I-V characteristic curve.

Two concentric spherical shells of radii R and 2R carry charges Q and 2Q respectively. Change in electric potential on the outer shell when both are connected by a conducing wire is (K= (1)/( 4 pi epis_0))

A steel flywheel is made in the shape of a solid ring of 40 cm external and 30 cm internal diameter. What is its maximum design speed? At what speed will it fly apart?

As angle of incidence increases, angle of deviation first _____minimum value and then increases.

A : When a light wave travels from a rarer to a denser medium, it looses speed. The reduction in speed imply a reduction in energy carried by the light wave. R : The energy of a wave of proportional to frequency of wave.

Aglassprism of refractive index 1.5 is immersed in water of refractive index 1.33. In this condition what should be the limiting angle of the prism for no emergent ray?

If veca and vecb are two vector with |veca| = |vecb| and |veca + vecb|+ 2|veca|,then angle between veca and vecb.

A block of mass 20kg is pushed with a horizontal force of 90N. If the co-efficient of static & kinetic friction are 0.4 & 0.3, the frictional force acting on the block is (g=10 ms^(-2))

The thermo-electric power P of a thermocouple is given by

The resistance of a wire is 5 Omega at 50^@C and 6 Omega at 100^@C . The resistance of the wire at 0^@Cwill be

A small sphere A of radius r and carrying a charge q is enclosed by a concentric spherical shell B of radius 2r carrying a charge 29. When A and B are connected by a conducting wire, the charge will flow from __________ to __________ .

In a coil of self-inductance 0.5henry, the current varies at a constant rate from zero to 10A in 2 sec. The induced e.m.f. in the coil is:

Suppose the Sun contracts (collapses) to a pulsar. Estimate the minimum radius of the pulsar and its period of rotation. The period of revolution of the Sun about its axis is 25.38 days (1 day = 24 hours).

A particle of mass m = 5 is moving with uniform speed v = 3sqrt(2) in the XOY plane along the line Y = X + 4. The magnitude of angular momentum of the particle about the origin is :

Draw equipotential surfaces for a uniform electric field along z-axis.

Obtain an expression for the frequency of radiation emitted when a hydrogen atom de-excites from level n to level (n-1). For large n, show that this frequency equals the classical frequency of revolution of the electron in the orbit.

Which magnetic substance has negative susceptibility.

There are two charges +1muC and +5 much. The ratio of the force acting on them is :

The osicllating electric and magnetic vectors of an electromagnetic wave are oriented along

Assertion : When a charge particle moves in a circular path. It produces electromagnetic wave. Reason : Charged particle has acceleration.

Calculate the current amplification factor beta when change in collector current is 1mA and change in base current is 20 mu A.

(a) A group of quantum states of the hydrogen atom has n= 5. How many values of l are possible for states in the group? (b) A subgroup of hydrogen atom states in the n = 5 group has l = 3. How many values of m_(l) are possible for states in this subgroup?

If the length of a cylinder on heating increases by 2%, the area of it's base will increase by

Statement (A) : Moving charges produce not only an electric field but also magnetic field in space Statement (B) : The force is exerted by a magnetic field on moving charges or on a current carrying conductor only but not on stationary charges

If a light ray incidents normally on one of the faces of the prism of refractive index '2' and emergent ray just grazes the second face of the prism, then the angle of deviation is

A cannon shell is fired to hit a target at a horizontal distance R. However, it breaks into two equal parts at its highest point. One part (A) returns to the cannon. The other part:

A current I from A toB is increasinginmagnitudes as shown in figure. What is the direction of induced current in the loop.

A point object is placed at the focus of a convex mirror, the image will be formed at

In aseries L-C-R circuit, resonance occurs, when:

Name the field which is conservative in nature .

A sinusoidal voltage of peak value 283 V and frequency 50 Hz is applied to a series LCR circuit in whichR=3Omega, L=25.48mH, C=7.96xx10^(-4)F. The impedance Z of the series LCR circuit is :

Give two differences between interference and diffraction.

Direction of motion of unit the positive test charge gives direction electric field. Direction of motion of………………………... gives direction of magnetic field.

Deompositionof uraeintoNH_(3) and CO_(2) isfollowedby theactionof enzyme :

When you have learned to integrate, derive the formula for the moment of inertia of a disk.

Which one of the following statements is true concerning the motion of an ideal projectile launched at an angle of 45^(@) to the horizontal ?

A convex lens of 40 cm focal length is combined with a concave lens of focal length 25 cm. The power of combination is

There are three source of sound of equal intensities with frequencies 400, 401 and 402 Hz. The no. of beats per second is :

Each of the two strings of length 51.6 cm and 49.1 cm are tensioned separately by 20 N force. Mass per unit length of both the strings is same and equal to 1 g/m. When both the strings vibrate simultaneously the number of beats is :

The binding energy of the electron in the energy of the electron in the second orbit is 3.4 eV. Its P.E. in the same orbit is_____eV.

A: a-particles with a large angle scattered leads to the discovery of the nucleus of the atom. R: The central part of the atom is almost concentrated by positive electric charges

An object of mass 1 kg is whirled in a horizontal circle of radius 25 cm. If it performs 60 rev/min, the centripetal force acting on it is,

Two lenses of power + 12D and - 2D are combined together. What is their equivalent focal length?

Define the term 'mutual inductance between the two coils. Obtain the expression for mutual inductance of a pair of long coaxial solenoids each of length l and radii r_(1) and r_(2) (r_(2) > r_(1)). Total number of turns in two solenoids are N_(1) and N_(2) respectively.

A slit of width d is placedin front of a lens of focal length 0.5 m and is illuminated normally with light of wavelength 5.89 xx 10^(-7)m. The first diffraction minima on either side of the central max. Are separated by 2 xx 10^(-3)m. The width of the slit is :

A small sphere A of radius r and carrying a charge q is enclosed by a concentric spherical shell B of radius 2r carrying a charge 29. When A and B are connected by a conducting wire, the charge will flow from to .