PHY204 List of eExam Questions in the Bank

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Q1 The path followed by magnetic flux is called

Q2 The suscepbility of ferromagnetic substance depend on _,

Q3 In a vacuum, permeability is equals to

Q4 Magnetic susceptibility is __for paramagnetic material

Q5 , __magneticm are closely related to ferromagnetism.

Q6 At curies temperature ferromagnetic materials behave like a _material

Q7 Magnetic materials canbe classified into three groups. Name them __, __,

Q8 _is defined as the magnetic dipole moment per unit volume.

Q9 The product of flux and reluctance is termed

Q10 The reluctance varies with

Q11 If electric field exerts a torque on the orbiting electron, the resultant is equal to the rate of change of its

Q12 law states that the line integral of E around any closed path equals the rate of change of the magnetic flux through the surface enclosed by path

Q13 Paramagnetism involves change in the of the magnetic moment of an atom.

Q14 factor is a characteristics of the state of the atom

Q15 The property of electron in an atom behaving as if it were rotating around an axis of its own is called

Q16 The ratio of the magnetic moment and the angular momentum is called

Q17 Bimuth is an example of

Q18 There are two types of non-magnetic materials, name them __,

Q19 __polarisation occurs by the distortion of the electronic structure.

Q20 If we determine the relative permittivity at different pressures for a gas, we can calculate the

Q21 For a dielectric, the refraction index is defined as the ratio of the to

Q22 The relationship between polarisability and relative permittivity is that of _equation

Q23 The electric field inside the dielectric sphere is and in the direction of the polarisation vector.

Q24 The field at the centre of a spherical cavity filled with air is called

Q25 If molecule/atom is removed when all other charges remain inaffected, the field is called

Q26 The magnetic properties of a substance can be characteristics by magnetic

Q27 The electric field inside the dielectric is than the electric field causing polarisation

Q28 The function of the earthed conductor is simply to reduce the potential of the first conductor and thereby to increase its

Q29 Another name for coulomb/volt is

Q30 The ratio of the charge placed on the conductor to the change in its potential is called

Q31 The resultant capacitance of two capacitors C1 and C2, when connected in parallel is given by

Q32 Any device which can store charge is a

Q33 An electrolytic capacitor must be placed in a AC circuit such that the potential of the oxide plate is always relative to the other plate.

Q34 the two types of electrolytic capacitors are ,

Q35 The electrolyte in a electrolytic capacitors is a solution of ,

Q36 The positive plate of electrolytic capacitors is coated with a thin layer of aluminium oxide which serves as

Q37 An electrolytic capacitor consists of two electrodes of

Q38 Capacitors may be broadly classified into two groups namely _,

Q39 For capacitors connected in series the reciprocals of the capacitances add up to give the reciprocal of the

Q40 The intermediate plates in two capacitor acquire equal and opposite charges because of

Q41 The effective capacitance of the parallel combination of capacitor is equal to the sum of the individual

Q42 If three capacitors are connected in series and a voltage source is connected across the two end plates __charged will be induced in each capacitor.

Q43 The capacitance per unit length of a cylindrical capacitor depends on __,

Q44 A cylindrical capacitor is made up of

Q45 mention two forms of capacitor that you have studied ,

Q46 The maximum safe voltage in a capacitor is called

Q47 The ratio of the capacitance with dielectric between the plates to the capacitance with free space between the plates is equal to

Q48 The capacitance of a parallel plate capacitor increases with the increase in _of the plates and also with the decrease of the

Q49 The polarised dielectric slab reduces the _inside the dielectric by a factor.

Q50 The S.I. unit of capacitance C si

Q51 Another name for a capacitor is

Q52 The minimum potential that causes the charge separation is known as the and the process is known as the

Q53 The induced dipole moment is given as p=αE where α is

Q54 The charges appearing on the surface of the dielectric are called

Q55 Polarisation depends on field that is __,

Q56 The induced dipole moment (p) of the molecule increases with the increase in the average field €.TRUE or FALSE

Q57 An atom consists of a positively charged nucleus and negatively charged particles with electrons revolving around it.TRUE or FALSE

Q58 Faraday in his experiment found that the capacitor is independent of the shape and size of the material but varies from matrial to material. TRUE or FALSE

Q59 The breakdown voltage is the applied potential difference per unit length of the dielectric when the dielectric just breakdown. TRUE or FALSE

Q60 Any device which can store charge is a called

Q61 In the absence of external magnetic field, each atom of a magnetic substance has a vector sum of magnetic moment of all the electonic orbits equal to zero is _______theory.





Q62 The potential of a conductor increases as the charged place on it is __________





Q63 Electric dipole moment per unit volume is known as ____________





Q64 The following parameters are magnetic moments of an atom except one





Q65 The magnetic flux is produced by the magnet due to some force called______





Q66 The magnetic properties of material are completely specified by the following quantities except one__





Q67 In paramagnetic and diamagnetic materials, the magnetisation is maintained by________





Q68 The behaviour of ferromagnetic materials under action of changing magnetic fields exhibits the phenomenon called_____





Q69 In the presence of a magnetic field, the atom does not simply turn along the magnetic field but presses around it with a frequency called





Q70 Paramagnetism is exhibited by those atoms which do not have magnetic ______





Q71 A change in orbital speed means a change in the _______





Q72 The magnetic moments are induced in a direction ________to that of the external magnetic field.





Q73 The unit of magnetic dipole moment is _____





Q74 The following characteristics of dielectric are desirable for use in capacitors except one





Q75 The refractive index of the same substances can be determined by_________





Q76 In estimating the capacitance of the guard ring capacitor, one of the following is considered_______





Q77 A common capacitor whose capacitance can be varied continuosly is used for_________





Q78 One of the advantages with the ceramic dielectrics is that they have _________





Q79 All of the following are the uses of a capacitor except one _______





Q80 An example fo non-polar molecules is________





Q81 _____________is an examples of electric insulators.





Q82 Reluctance depends on the following except_____





Q83 The ratio of the intensity of magnetisation induced in it and magnetic field is called______





Q84 The total number of lines of force per unit area due to magnetising field and due to the field induced in the substance is called _______





Q85 What is the value of magnetic susceptibility in a vacuum





Q86 The temperature at which the forces of thermal agitation dominate exchange forces is called_____





Q87 The magnetic dipole moment of the atoms arises due to the spins of _______electrons





Q88 When a diamagnetic atom is placed in an external magnetic field normal to its orbit, the field induces a magnetic moment opposing the field itself. This statement is ______





Q89 The orbital motion of the electron is associated with a magnetic moment n, which is proportional to its orbital______





Q90 The magnetic field produced by the magnetised material is obtained by______





Q91 The magnetic resistance is known as _______





Q92 Diamagnetism involves a change in the ______of the magnetic moment of an atom.





Q93 Gyro-magnetic ratio is independent of the _____and_____





Q94 An aluminium is a typical example of _____material





Q95 Materials which are not influenced by a magnet are called _____





Q96 For polar substances, relative permittivity varies with _______





Q97 The relation between polarisability and refractive index is known as the_______





Q98 Which of the field causes polarisation of the atom.





Q99 In an electric field, the electrons and atomic nuclei of the dielectric material experience ______in opposite direction





Q100 Capacitors are used in ________field





Q101 Ceramic capacitors are useful in ______circuits.





Q102 When a dielectric slab is inserted between the parallel plates of a condenser the capacity is _______





Q103 The field strength at which the dielectric is about to break down is known as the ____________





Q104 Non-polar molecule acquires a Dipole moment only in the presence of__________





Q105 In a dielectric material, the centres of positive and negative charges of its atoms are found to_________at the centre of the sphere.





Q106 In dielectrics, all the electrons are________to their respective atoms.





Q107 When a potential difference is applied to the insulators___________





Q108 The reciprocal of reluctance is called______





Q109 Change in the orientation of the magnetic moment accounts for _______





Q110 The magnetic moment due to current is the product of the ______and the ______of which the electron path is the boundary





Q111 ________equation gives the relation between susceptibility and atomic/molecular polarisability.





Q112 Electrolytic aluminium oxide is used where





Q113 The unit of permeance is ________





Q114 The unit of reluctance is ________





Q115 The product of current in amperes and number of turn is called________





Q116 The ratio of the magnetic induction B in the medium to the magnetising field is called _______





Q117 Magnetic susceptibility is negative for ____substance.





Q118 The magnetic properties of a substance can be characteristics by magnetic ________





Q119 A large number of varieties of plastics are good examples of ____________





Q120 Faraday experiemntally found that when an insulating material called dielectric is introduced between two plates of a capacitor, it is found that the capacitance is increased by a factor which is greater than ______________