61151. Assertion (A): Orbital magnetic moment of an electron in an atom is of the order of 1 Bohr magneton.Reason (R): 1 Bohr magneton = 9.27 x 10-24 A/m2.
61152. As per Bohr's postulate, only those circular orbits are stable for which the angular momentum is equal to an integer times .
61153. Inductors used at V.H.F. are made using
61154. If a capacitor C having selectivity factor Q is scaled down in all its dimensions by a factor K without any altering the dielectric material, the new capacitor will have capacitance and selectivity as
61155. The hysteresis loss is
61156. The Protestant Reformation started primarily because of the action of?
61157. Assertion (A): For a magnetic material M = (μr - 1) H, where M is magnetic dipole moment/m3, H is field intensity A/m and μr is relative permeability.Reason (R): μr can have any value from 0 to hundreds of thousands.
61158. As regards ∈0 and ∈r (absolute and relative permittivity)
61159. Thermistor is used in
61160. Nichrome is used for
61161. The electric dipole moment of a neutral system of point charges Q1, Q2.... is Qiri . The charges Qi
61162. The class of insulation of impregnated paper is
61163. Assertion (A): The resistance of a copper specimen changes by about 22% when temperature is increased from room temperature to 700°C.Reason (R): The physical properties of a material are determined mostly by the extent of impurities.
61164. Assertion (A): For most metals, Fermi energy EF is less than 10 eV.Reason (R): Fermi level of a metal is given by EF = 3.64 x 10-19 (n)2/3 where n is number of free electrons/m3 of metal.
61165. The capacitance of an insulated conducting sphere of radius R in vacuum is
61166. The transition of electron from energy level W1 to W2 is associated with emission or absorption of electro magnetic radiation of frequency f such that
61167. The first colour film in malayalam?
61168. Even at room temperature, an intrinsic semiconductor has some holes. These holes are due to
61169. In carbon resistor colour code, if the third band is of silver, it indicates
61170. In a metal, the drift velocity of electrons in the presence of a electric field E is
61171. At a temperature of about 1 K, aluminium is a
61172. The first privatised river in India is?
61173. If v is the velocity of electron, t c is the average time between collisions, the mean free path λ = vt c.
61174. Assertion (A): An electron having charge - e and mass m and lying in an electric field E is subjected to an acceleration - (e/m) E.Reason (R): If there are n electrons/m3 moving with velocity vx and each electron has a charge - e, the current density J = - n evx.
61175. When a pentavalent impurity is added, the semiconductor becomes
61176. In body centred cubic structure, comers and centre of the cube are occupied by identical atoms.
61177. For a multiplate capacitor having n plates, A as area of each plate, the capacitance is proportional to
61178. The orientation polarization is directly proportional to temperatureinversely proportional to temperatureinversely proportional to square of permanent dipole momentdirectly proportional to square of permanent dipole moment. Which of the above are correct?
61179. Assertion (A): Diamond and carborudum are both very hard materials.Reason (R): Valence band can be extremely strong.
61180. The chemical properties of atoms are determined by all the electrons and their configuration.
61181. A dumpy level is set up between stations A and Staff is held at A whose reduced level is 000 and Back Sight is noted as100,then Fore Sight is noted as000 after holding the staff at What is the reduced level of B?
61182. If k is Boltzmann's constant and T is absolute temp, then at room temp.
61183. If the valence electron is separated from a copper atom, the remaining part of atom has a net charge of
61184. The dielectrics having only one kind of atoms are known as elemental dielectrics.
61185. For a core having a relative permeability μr, magnetic dipole moment per unit volume M and field strength H, the flux density B is
61186. The law that (where K is thermal conductivity, σ is electrical conductivity and T is absolute temperature) for all metals is equal to a universal constant is known as
61187. In elemental dielectrics, the orientation and ionic polarization are absent.
61188. In which of the following semiconductor are holes majority carriers
61189. The equation D = ∈0∈r E refers only to isotropic materials.
61190. When a ferromagnetic substance is magnetised there are small changes in dimensions. This phenomenon is called
61191. Assertion (A): In some materials, ∈r is independent of temperature while in others, ∈r depends on temperature.Reason (R): If permanent dipoles are absent, ∈r varies with temperature.
61192. An electron in a homogeneous magnetic field and having velocity perpendicular to the direction of field moves
61193. Spontaneous polarization occurs in ferroelectric materials.
61194. For a given value (n) of principle quantum number, the number of possible electronic states are
61195. Electrical conductivity of metals expressed in ohm-1 m-1 is of the order of
61196. In a metal the probability of a state 0.1 eV below Fermi level being occupied
61197. An homogeneous dielectric material is subjected to an electric field E. If a small cavity is made inside the material, the electric field intensity inside and outside the cavity are different.
61198. A dielectric is subjected to alternating field. The dielectric losses are potential to
61199. Semiconductors have a positive temperature coefficient of resistivity.
61200. From a homogeneous and isotropic dielectric material of dielectric constant ∈r, a small volume element is taken out creating a cavity. The field can be kept homogeneous if Di. (i.e., electric flux density inside the cavity) and D0 (i.e., electric flux density outside the cavity) are such that