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1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Ferro-electric materials have which of
the following characteristics ? Both of the above [other wrong options] [Discuss in forum] They have a high dielectric constant
which is non-linear They exhibit hysteresis loops None of the above |
Q22 ⇒ The major use of ferro-electrics is in ____ electro-mechanical transducers [other wrong options] [Discuss in forum] active transducers passive transducers none of the above |
Q23 ⇒ For which of the following materials the
relative permeability is much greater
than unity ? Ferro-magnetic materials [other wrong options] [Discuss in forum] Diamagnetic materials Paramagnetic materials None of the above |
Q24 ⇒ Alnico magnet alloys have the ____ energy
per unit of cost or volume of any permanent
magnet material commercially
available. highest [other wrong options] [Discuss in forum] lowest either of the above none of the above |
Q25 ⇒ The magnetic domains, during the
process of magnetisation of ferro-magnetic
material expand first and then. rotate [other wrong options] [Discuss in forum] only expand neither expand nor rotate rotate first and then expand |
Q26 ⇒ The converse of hardness is known as softness [other wrong options] [Discuss in forum] malleability toughness none of the above |
Q27 ⇒ Commonly used conducting materials
are both (a) and (b) [other wrong options] [Discuss in forum] copper aluminium copper and silver platinum and gold |
Q28 ⇒ Superconductors are becoming popular
for use in generating very strong magnetic field [other wrong options] [Discuss in forum] manufacture of bubble memories generating electrostatic field generating regions free from magnetic field |
Q29 ⇒ The structure sensitive property of a
super conductor is critical current density [other wrong options] [Discuss in forum] critical magnetic field transition temperature none of the above |
Q30 ⇒ Carbon electrodes are not used in GLS lamps [other wrong options] [Discuss in forum] electric arc furnace dry cells cinema projectors |
Q31 ⇒ Thermonic emission occurs in vacuum tubes [other wrong options] [Discuss in forum] copper conductors ferrite cores transistors |
Q32 ⇒ The number of atoms per unit cell in
B.C.C. structure is 2 [other wrong options] [Discuss in forum] 1 4 8 |
Q33 ⇒ Due to which of the following factors
the brush wear rate is altered ? All of the above [other wrong options] [Discuss in forum] Speed of the machine Contact pressure Surface conditions of brush and commutator Excessive sparking |
Q34 ⇒ Copper, even though costly, finds use
in the windings of electrical machines
because all of the above [other wrong options] [Discuss in forum] copper points offer low contact
resistance copper can be easily soldered and welded copper windings are less bulky and the machines become compact |
Q35 ⇒ Selenium is ____ semiconductor. intrnisic [other wrong options] [Discuss in forum] extrnisic N-type P-type |
Q36 ⇒ Superconducting metal in super conducting
state has relative permeability
of zero [other wrong options] [Discuss in forum] one negative more than one |
Q37 ⇒ For germanium the forbidden energy
gap is 0.7 eV [other wrong options] [Discuss in forum] 0.15 eV 0.25 eV 0.5 eV |
Q38 ⇒ The conductivity of semiconductors
depends on which of the following factors
? Both (a) and (b) [other wrong options] [Discuss in forum] Number of current carriers present
per unit volume The mobility of the current carriers None of the above |
Q39 ⇒ Conduction of heat in a semiconductor
takes place in which of the following
ways ? Both (a) and (b) [other wrong options] [Discuss in forum] By the thermal vibrations of the
atoms By the electrons None of the above |
Q40 ⇒ A good insulating material should
possess which of the following characteristics
? All of the above [other wrong options] [Discuss in forum] Large insulation resistance High dielectric strength Least thermal expansion Low dissipation factor (loss tangent) |
Or |