(A) Conduction band (X)
(B) Valence band (X)
(C) Forbidden band (X)
(D) Core band ()
Answers: A completely filled band is called Core band.
(A) Electrical insulators alone (X)
(B) Electrical conductors alone (X)
(C) Electrical semi conductors alone (X)
(D) All of the above ()
Answers; The band theory of solid explains satisfactorily the nature of all of the above.
(A) Symmetry (X)
(B) Homogeneity ()
(C) Isotropy (X)
(D) Cleavage (X)
Answers: If the density of atoms remain same along any direction in a crystal is a called Homogeneity.
(A) Isotropy (X)
(B) Cleavage (X)
(C) Homogeneity (X)
(D) The external symmetry of form ()
Answers: The angular positions of cells remains the same for a sample of a crystal. This property is called the external symmetry of form.
(A) Semi conductor (X)
(B) Super conductors (X)
(C) Insulators ()
(D) Conductor (X)
Answers; Materials in which valence electrons are tightly bound to their atoms at low temperature are called Insulators.
((A) High voltage A.C (X)
(B) Low voltage A.C (X)
(C) Alternating current at its peak value ()
(D) D.C current at peak value (X)
Answers: A ferromagnet will become full magnetized at Alternating current at its peak value .