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How does nuclear radius of an atom depend on its mass number ?

The optical density of turpentine is higher than that of water while its mass density is lower. Figure shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in as figure, the path shown is correct?

Assertion:The mass of beta-particles when they are emitted is higher than the mass of electrons obtained by other means. Reason:beta-particle and electron , both are similar particles.

The nucleus which has radius one-third of the radius of Os^(189) is

The output from a LASER is monochromatic. It means that it is :

The energy of the hydrogen atom in its ground state is -13.6 eV. Determine the energy of the energy level whose quantum number is 2.

(A) : If a galvanometer is converted into an ammeter and a milliammeter then the shunt resistance of ammeter is lower than that of milliammeter. (R) : In Ammeter the current through shunt is less than that o galvonameter.

The B-H curves (a) and (b) drawn below are associated with :

The refractive index of a lens material is1.5 and focal length f. Due to some chemical changes in the material, its refractive index has increased by 2%. The percentage change in its focal length is

A particle of charge q and mass m is projected with kinetic energy K. into the region between two plates of uniform magnetic field of induction B as shown. If the particle is to miss collision with opposite plate the maximum value of B is

Two wires of equal diameters of resistivities p_1 and p_2 and length x_1 and x_2 respectively are joined in series. The equivalent resistivity of the combination is

A long straight wire carries a current i. A particle having a positive charge q and mass m, kept at a distance x_0 from the wire is projected towards it with a speed v, as shown in Fig. Find the minimum separation between the wire and the particle.

At night the objects situated outside a brightly illuminated room are not visible through the glass windows. But if the Iights inside the room are off, external objects are visible. Explain the reason.

You are supplied with a 1m long uniform resistance wire of resistance 3Ω and a cell of emf 1.5v.Can you construct a potentiometer using 1m wire? If no, give reason, if yes, what is the least count of the arrangement?

यदि f(x) =F ax + b, जहाँ a तथा b पूर्णाक है तथा f(-1)=-5 तथा f(3)=3 हो, तो a तथा b का मान है

b.A convex mirror always produces a virtual image independent of the location of the object.

Identify the parts X and Y in the block diagram of a generalised communication system

Two metal plates form a parallel plate capacitor.The distance between the plates is d. A metal sheet of thickness d/2 and of the same area is introduced between the plates. What is the ratio of the capacitances in the two cases ?

When a proton is released from rest in a room, it starts with an initial acceleration a0 towards west. When it is projected towards north with a speed v_(0) it moves with an initial acceleration 3a_(0) towards west. The electric and magnetic fields in the room are respectively.

During emission of a negative beta - particle

A : Torque on the coil is the maximum, when coil is suspended in a radial magnetic field. R : The torque tends to rotate the coil on its own axis.

The electric field due to an electric dipole at a distance from its centre position is E. If the dipole is rotated through an angle of 90^(@) about its perpendicular aixs, electric field at the same point will be

A conducting sphere of radius 10 cm has an unknown charge if the electricfield 20 cm from the centre of the sphere is 1.5 xx10^(3)N/Cand pointsradialy inward whatis the net charge on the sphere

Charge of a circular ring of radius 20 cm is 100muC. Calculate the electric field intensity at distance (i) 5 cm and (ii) 5 m away from the centre of the ring along the axis.

A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of

पृथ्वी सम्मेलन किस देश में आयोजित किया गया था?

A Ship 'A' steams down north a speed of 8 kmph. andship B due west at a speed of 6 kmph. The velocity of A w.r.t. B is .

फलक केंद्रित इकाई कोशिका में संकुलन दक्षता होती

A thin circular ring of mass M and radius R is rotating about its central axis with angular velocity omega. Four point objects each of mass m are attached gently to the opposite ends of two perpendicular diameters, the angular velocity of the ring is given by :

In a Huygen's eye piece, the eyelens has a focal length of 'f'. The equivalent focal length of eyepiece is

If the collector current changes from 2mA to 3mA in a transistor, when collector-emitter voltage is increased from 2 to 10V, then the output resistance of the transistor is

The magnetic field in a plane electromagnetic wave is given by B_(y)=(2xx10^(-7)) T sin (0.5xx10^(3)x+1.5xx10^(11)t). What is the wavelength and frequency of the wave?

A battery of emf 10 V and internal resistance 3Omega is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?

A convex mirror of focal length f produces image 1/n th of the size of the object. The distance of the object from the mirror is :

An iron core solenoid has self-inductance 2.8 H. When the core is removed, the self-inductance becomes 2 mH. What is the relative permeability of the core used ?

A magnetic field in a certain region is given by barB = (40hati - 18hatk)G. How much flux passes through a 5.0 cm^(2) area loop if the loop lies flat on xy - plane ?

Assertion : Black boles highly dense massive object. Reason : Its mass ranges from 20 times mass of the sun to 1 mission times mass of the sun.

In the following diagram the conducting shells are concentric .The amount of charge that flows through the switch (S) after closing it is

The mass of a disk with a circular hole cut in it (Fig. ) is m. Find its moment of inertia about an axis passing through point A perpendicularly to the disk's plane

Number of spectral lines in hydrogen atom is

Both the latitudinal and longitudinal extent of India's mainland is about 30°. But on looking at the map of India which of the following alternatives do you observe about India's size?

The electric field in a region is given by vec(E )= E_(0) (x)/(L) hat(i). Find the charge contained inside a cubical volume bounded by the surface x=0, x= L, y= 0, y= L, z= 0 and z=L.

For a spherical capacitor show, at which points the electric field will be zero ? (r is the distance of point from centre O)

TheresultantoftwovectorsvecAand vecBis perpendiculartovecA. MagnitudeofResultantvecRis equalto half MagnitudeofvecB. FindtheanglebetweenvecAand vecB ?