1. . Natural magnet has:
(A) No pole
(B) One pole
(C) Two poles
(D) Three poles
2. . The term magnetism comes from the region:
(A) Magnesia
(B) Egypt
(C) South Africa
(D) Russia
3. . The substances which have weak negative susceptibility to a magnetic field are materials:
(A) Paramagnetic
(B) Diamagnetic
(C) Ferromagnetic
(D) None of these
4. . The substances which have a small, positive susceptibility to magnetic fields are materials:
(A) Ferromagnetic
(B) Paramagnetic
(C) Diamagnetic
(D) All of these
5. . The substances which have a large, positive susceptibility to an external magnetic field are materials:
(A) Magnets
(B) Diamagnetic
(C) Paramagnetic
(D) Ferromagnetic
6. . The group of atoms pointing in the same direction is called:
(A) Domain
(B) Point group
(C) Range
(D) Gang
7. . Number of atoms in a domain are:
(A) 10²
(B) 10⁴
(C) 10¹⁵
(D) 10⁶
8. . The temperature at which ferromagnetic substances turn into paramagnetic substances is called:
(A) Curie temperature
(B) Kelvin
(C) Centigrade
(D) Fahrenheit
9. . Band theory of solids has explained the behaviour of:
(A) Insulators
(B) Conductors
(C) Semiconductors
(D) All of these
10. . Which of the following has the greatest energy gap:
(A) Insulator
(B) Conductor
(C) Semiconductor
(D) All of these