WorksheetsPhysical Chemistry - Internal Exam 1
Total questions: 25
Worksheet time: 12mins
Solids are called (a) if their particles are arranged in repeated three- dimensional patterns.
When Substance go directly from the solid phase to the gas phase, the phase change is called
Sublimation
Condensation
Evaporation
Vaporization
Matter in which atoms are tightly held in place is a .........
Gas
Plasma
Liquid
Solid
Anisotropy represents a state in which properties as the same in all directions.
True
False
Crystalline solids are isotropic because of random arrangement of atoms in all three dimensions.
False
True
Which of the following is an amorphous solids?
Graphite
Quartz glass
Chrome alum
Silicon Carbide
The BCC cell, with its familiar atom in the center, and FCC cell, with one atom at the center of each face are example of primitive unit cells
True
False
The shaded area in the figure represents
Plane of Symmetry
Axis of Symmetry
Diagonal Plane of Symmetry
Centre of Symmetry
Which of the following represent a family of direction in the crystal lattice
<1 1 1>
{1 1 1}
[1 1 1}
(1 1 1)
X-ray diffraction is used for the determination of crystal structures because
It is easy to focus X-ray.
X-rays can penetrate thick specimens.
X-rays can have wave lengths comparable to or shorter than the spacing between atomic planes.
X-rays are invisible.
There are (a) crystal systems(Fill with number)
The correct expression for Bragg’s law is nλ = ___________
a) dsinθ
b) dcosθ
c) 2dsinθ
d) 2dcosθ
The crystal system for which a ≠ b ≠ c , α = ϒ =90° β ≠ 90° is called......
Monoclinic lattice
Triclinic lattice
Hexagonal
Trigonal
If the angle of incidence is 30°, then the wavelength for first-order spectrum is equal to __________
2d
d
d/2
3d/2
In the figure above which crystalline structure is illustrated.
Body centered cubic (BCC)
Face centered cubic ( FCC)
End centered cubic
Simple Cubic
IE, First Ionization Energy of X → X(g)+e⁻→X⁻(g)
True
False
Change in energy that occurs when a neutral atom in the gas phase gains one extra electron.
Electron Affinity (EA)
Ionization Energy (IE)
Lattice Energy
Sublimation Energy
Find miller indices of a crystal which cutout the crystallographic plane by (2a, 3b, c)
(2 3 1)
(3 2 1)
[3 2 6]
[2 3 1]
(3 2 6)
In superconductivity the conductivity of a material becomes
Zero
Finite
Infinite
None of the above
The dipole moment of an atom is due to
The orbital motion of electrons
The spin motion of electrons
Neither the spin motion nor the orbital motion of electron
Both orbital and spin motions of electron
The ideal super conductors exhibit (a)
The presence of parallel alignment of magnetic dipole moment is given by which materials..............
Ferromagnetic
Antiferromagnetic
Paramagnetic
Ferrimagnetic
When does a ferromagnetic material become paramagnetic material?
At Curie temperature
Above Curie temperature
Below Curie temperature
Never
The bar magnet has
A. The dipole moment
B. Monopole moment
C. Both A and B
D. None of the above
The smallest portion of the lattice is known as (a)
