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You Are On Multi Choice Question Bank SET 1225

61251. Magnetic hysteresis phenomenon is explained by





61252. The function of haemoglobin is?





61253. The relation between thermal conductivity K (W/m/°C), heat flow density Q (watt/m2) and dT/dx (°C per metre) is





61254. As per Matthiessen's rule, the total resistivity r of a conductor can be written as r = r i + aT, where r i and a are constants and T is absolute temperature. At very low temperatures





61255. Consider the following statement: In case of a superconductor B = 0μr is highdiamagnetism is hightransition temperature varies with isotopic mass. Of the above statements





61256. Assertion (A): In liquids and glassy substances, dielectric losses occur. Reason (R): The orientation polarization in many substances is frequency dependent.





61257. A single layer air cored coil has n turns and inductance L. If a new coil is formed by having 2n turns while keeping the coil length and diameter the same, the new inductance is





61258. The colour code on a carbon resistor is yellow-violet-orange. The value of resistance is





61259. A dielectric of relative permittivity ∈r is subjected to a homogeneous electric field E. The dipole moment P per unit volume is given by





61260. Which of these has the highest dielectric strength?





61261. An electron in a metal suffers collision and if the probability of it being scattered over an angle dθ is 2p P(θ) sin θ dθ where P(θ) is an arbitrary function of scattering angle θ, then





61262. For an insulating material, dielectric strength and dielectric losses should be





61263. Consider the following statements An iron cored choke is non linear and passive device.A carbon resistor kept in sunlight is a time invariant and passive device.A dry cell is a time varying and active device.An air capacitor is time invariant and passive device. Of these statements





61264. Some ceramic materials become superconducting





61265. Assertion (A): Doping level in extrinsic semiconductors is very small.Reason (R): Additional of impurity in the ratio of 1 part in 108 parts increases the number of charge carriers by about 20.





61266. The core of an atom consists of





61267. Assertion (A): Copper is a good conductor of electricity.Reason (R): Copper has a face centred cubic lattice.





61268. When a dielectric is subjected to an electric field E, each volume element of dielectric can be considered to be carrying an electric dipole moment.



61269. Assertion (A): In an intrinsic semiconductor J = (μn x μp)eni.Reason (R): Intrinsic charge concentration ni at temperature T is given by ni2 = A0 T3 e-EG0/kT.





61270. When the atom of rare gas is placed in an electric field the nucleus shifts from the centre of electron cloud by an amount x. If the radius of electron cloud is R, then





61271. Macroscopic quantities of a given material





61272. For a superconductor, the relative permeability is





61273. The relative permeability of a ferromagnetic material is





61274. The direction of trade winds in the northern hemisphere?





61275. Assertion (A): The equation D = ∈0∈rE is applicable only to isotropic materials.Reason (R): In polycrystalline materials, the directional effects are absent.





61276. Assertion (A): For a dielectric, P = ∈0(∈r - 1) E.Reason (R): Dipole moment per unit volume is called polarization of dielectric.





61277. Assertion (A): Ferrites are very useful at very high frequencies.Reason (R): Ferrites have high permeability and high resistivity.





61278. In a conductor the current flow is due to





61279. When an electron moves at velocity v in combined electric and magnetic fields E and H, the Lorentz force F is F = - e(E + v x B).



61280. Anuja Prakash Thaku is related with which of the following game?





61281. When Schrodinger equation is applied to the motion of electron in the field of protons, the physically acceptable solutions for the wave function exist for quantum number which are





61282. For dielectrics in alternating field, polarizability a e is a complex quantity. The imaginary part of a e is zero for





61283. In the wave mechanical theory, the maximum of the charge distribution in the ground state occurs for a distance from the nucleus equal to





61284. Hysteresis curve is associated with motion of domain walls.



61285. The number of protons in germanium atom is





61286. Sulphur hexafluoride is used in





61287. The number of valence electrons in trivalent impurity is





61288. The v-i characteristic shown in the given figure is for





61289. The induced magnetic dipole moment has a direction opposite to the applied magnetic field.



61290. An atom of polarizability a is placed in a homogeneous electric field E. The energy stored in polarized atom is




61291. If B, H and M denote flux density, field intensity and magnetisation, B = μ0 (H + M).



61292. A capacitor can be represented by a capacitance and resistance in parallel. For a good capacitor, this parallel resistance should be





61293. Assertion (A): Ionic solids, in general, have no electrical conductivity.Reason (R): In ionic solids, electrons are tightly bound to the nucleus.





61294. The number of players in a basket ball team?





61295. The number of valence electrons in silicon atom is





61296. ∈r is determined by the atomic structure of the dielectric.



61297. A rare gas has N atoms per m3. If electronic polarizability of single atom of this gas is a e, then





61298. The colour code on a carbon resistor is brown-black-red-gold. The value of resistance is





61299. Tesla is a unit of





61300. If the operating temperature increases by 10°C, the rate of deterioration of solid dielectric becomes





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