Demo post1

1.Solid States

1. Which solid state? of the following conditions favours the existence of a substance in the
i g temperature
Low temperatu
High
wweak thermal cohesive eergy lorces
2.Which ot the tollowing is not
( Definite and characteristic a characteristic ol
heat of fusion. a erystalline solid?
(ii sOuopc A particies regular nare
U A true solid in periodically the entire Crystal. repeated pattern ol arrangement of constituent
3. Which of the following is
uartz Grapite glass (C an amorphous solid?
(SiO
on fad carbide (SIC)
Which ot the lolowing arrangerments shows schernatic algnment ol magnetic
OOOO00
OOO000
OOOO00
tn OOOO
5. Which of the lollowing is true about the valtue of relractive index of quartz glass?
(0 Same all directions
(1) Different in
De in measured different directions
not
ways zero
6. Which of heating the following they statement
On become is crystalline not true about amorphous solids?
They become may at certain temperature.
an Amorphous may erystalline
solds be moulded on keeping lor long time
can by heating.
ney &are ansoropc nature
7. The sharp melting point ol Crystalline solids is due to
distane in the ervstal lattice paarticies obseved over a snort
() a tce regular n arrangement tne crystal lathce. of constituent particles observed over a longg
(1) of particles different directions.
(v same diferent arrangement constituent of particles in
arrangement constituent in diferent directions.
0e holecules are held in the erystals lattice by-
(i) loncdon dipole-dipole lorces interactions
(ii) covalent bonds
iv) coulombic forces
wc S0,(Sold) Or he lolowing is a network solld?
ii) (11)
Diamotkd