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Which of these is an amorphous solid?

Which of these is an
amorphous solid?
Glass
Diamond
Graphite
Sodium chloride
2 One of these is not crystalline
Diamond
Polythene
Potassium iodide
Graphite
3 Which of these is not true of a
lattice?
It is an arrangement of
geometrical points in a definite
pattern in space
It resembles a scaffold
erected for the construction of a
building
A regular periodic
arrangement of points in space
Lattice is present only in ionic
solids
4 Crystal planes are represented
by certain numbers known as
Milner indices
Miller indices
Braggs indices
X-ray indices
5 The density of a crystal
depends on all the following
except
Number of atoms
Its mass
Its geometry
Volume of the unit cell
6 Which of these is NOT true
about semiconductors
They are insulators under
normal conditions
They conduct under normal
conditions
They conduct when heated
Electrical conductivity
increases with temperature
7 Which of the following
elements, if doped into silicon,
would give an n-type
semiconductor?
Al
P
C
O
8 Which of the following
elements, if doped into silicon,
would give an p-type
semiconductor?
Al
P
C
O
9 Which group of elements in the
periodic table is known for
semiconductor behaviour?
group I
group II
group III
group IV
10 One of the followings is not
true of liquids
The inability of a liquid to
flow enables it to assume the
shape of the container
A liquid never expands to fill
the container
The characteristics of a liquid
lie between those of a solid and
a gas
Particles of liquid are free to
move from one point to another
11 When ice melts
a phase change occurs from
a solid phase to liquid phase
an endothermic process
occurs which requires energy
the water changes from a
crystalline solid to a liquid
all of the above
12 When water freezes
a phase change occurs from
a liquid phase to a solid phase
an exothermic process
occurs where energy is lost from
ice to the surroundings
the liquid water changes
from a random structure to a
crystalline solid
all of the above
13 Which of the followings does
NOT influence the magnitude of
surface tension?
Hydrogen bonds
Metallic bonding
Ionic bonding
Dispersion forces
14 Which of the followings will
not diffract X-rays?
Solid
Liquid
Gas
Crystal
15 Which one of the following
statements most accurately
relates the properties of a liquid
at room temperature with its
intermolecular forces?
A liquid with strong
intermolecular forces will
probably have a high surface
tension and a high boiling point.
A liquid with strong
intermolecular forces will
probably have a low surface
tension and a high boiling point.
A liquid with strong
intermolecular forces will
probably have a low surface
tension and a high boiling point.
A liquid with strong
intermolecular forces will
probably have high boiling
point.
16 Which of the following is NOT
true of a liquid’s viscosity?
It is independent on
intermolecular forces
It is a measure of the
resistance to flow
It increases with temperature
A highly viscous liquid flows
slowly
17 Which of these alkanes is
expected to have the highest
viscosity?
Heptane
Decane
Octane
Nonane
18 When a liquid is in
equilibrium with its vapor in a
closed container:
the rate at which molecules
from the liquid phase enter the
gas phase exactly equals the rate
at which molecules from the gas
phase pass into the liquid phase
a change in temperature will
not change the pressure in the
container
the amount of gas in the
container must exactly equal the
amount of liquid
molecules cannot go from the
liquid phase to the gas phase
because the amount of liquid in
the container is constant
19 A liquid will "wet" a surface if:
the liquid has a lesser density
than the surface
the forces between the liquid
molecules are weak
the liquid has a low vapor
pressure
the forces between the
molecules and the surface are
greater than the forces between
the molecules of the liquid
20 Surface tension is thought to
be due to:
surface area trying to
increase
molecules on the surface of
the liquid are drawn inwards
trying to minimize the surface
area.
air absorbed on the surface
surface molecules having
lower energy than bulk
molecules

This question was asked on Jan 14, 2013.

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