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Practice each question, then open the answer or worked solution.
Which of the following is not true about ionic solids?
depending upon their size.
the radii of the ions occupying the voids.
Option (iv) is the answer.
A ferromagnetic substance becomes a permanent magnet when it is placed in
a magnetic field because ________.
(i) all the domains get oriented in the direction of the magnetic field.
(ii) all the domains get oriented in the direction opposite to the direction of
the magnetic field.
(iii) domains get oriented randomly.
(iv) domains are not affected by the magnetic field.
Option (i) is the answer.
The correct order of the packing efficiency in different types of unit cells is ________.
Option (ii) is the answer.
Which of the following defects is also known as dislocation defect?
Option (i) is the answer.
In the cubic close packing, the unit cell has ________.
cells.
Option (iv) is the answer.
The edge lengths of the unit cells in terms of the radius of spheres constituting
fcc, bcc and simple cubic unit cell are respectively________
(i) 2√2r, 4r/√3, 2r
(ii) 4r/√3, 2√2r, 2r
(iii) 2r, 2√2r, 4r/√3
(iv) 2r, 4r/√3, 2√2r
Option (i) is the answer.
Which of the following represents the correct order of conductivity in solids?
Option (i) is the answer.