Here I am giving you question paper for Tamil Nadu common entrance test Physics And Materials Science examination in PDF file attached with it so you can get it easily.

76. Materials exhibiting different properties
along different directions are called
1. isotropic
2. amorphous
3. anisotropic
4. crystalline
77. The coordination number of BCC structure is
1. 6
78. Effective number of atoms belonging to the
unit cell of FCC structure is
1. 1 4
3. 4
4. 2
79. If 0.28 nm is the interatomic distance of
crystal, the lattice parameter is
81. If the lattice parameter of cubic crystal is
1 nm and the distance between two parallel
planes is nm, the Miller indices of the
planes are
1. (11 0)
2. (1 0
3. 0
82. The plastic deformation of a crystal is due to
the presence of
1. Schottky defect
2. Point defects
3. Frenkel defect
4. Dislocations which move
83. A plate carrying charge of 0.5 coulomb is
accelerated through a potential of 2000 volts.
It attains a kinetic energy equal to
1. 0.14 nm
2.
3. 0.56 nm
4. None of the above
1.
2.
3.
Joules
hours
80. In a crystal cell, a , b and c represent unit
translational vectors along x, y and axes.
4. 1500 ergs
84. There are two charges coulomb and
A plane makes
intercepts 2a, 3b along
coulomb interacting among themselves.
y axes and runs parallel to axis. Miller
indices corresponding to this plane is
1.
The ratio of forces on them will be
85. There are 1 0 condensers each of capacity 89. If E is the kinetic energy of the material
5 The ratio between maximum and particle of mass m, then the de Broglie
minimum capacity obtained from these
condensers will be
1. 1 0 0 : 1
2. 6 0 : 9
3. 1 : 1 0 0
4. 1 : 5
86. Two bulbs, one of 5 0 watts and another of
25 watts are connected in series to the mains.
The current
1. through the 25 watt bulb is more
2. through the 50 watt bulb is more
3. is different in different bulbs
4. is the same in both the bulbs
87. A bar magnet is cut exactly a t the middle of
its length. The pole strength of the resulting
magnets
1. reduces to half its original value
2. increases twice to its original value
3. reduces to one fourth of its initial value
4. remains t h e same
88. The magnetic field a t a distance d from a
wavelength is given by
1.
90. Existence of matter wave was experimentally
first demonstrated by
1. Newton
2. Planck
3. Davission and Germer
4.
91. When a n electron is accelerated, if
wavelength is 1 then t h e applied voltage is
nearly equal to
1. 15 Volts
2. 1 2 Volts
3. 500 Volts
4. 150 Volts
short bar magnet When the potential difference between t h e
transverse position are in the ratio
1. 1 : 4
2.
electrodes of a n X-ray tube is increased, i t
results in a n increase in
1. intensity
2. frequency
3. wavelength
4. speed of X - rays
93. T. invented The picture tube screens in television sets
1. He-Ne laser operate on
2. CO, laser 1. thermoluminescence
3. Ruby laser 2.
4. Nd: 3.
4. photoluminescence
94. We observe colours in thin films only because
1. thick films absorb light
2. reflection is possible only in thin films
3. interference condition is satisfied only
in thin films
4. dispersion is possible only in thin films
95. An alpha particle of energy MeV is
scattered through by a fixed
nucleus. The distance of closest approach is of
order of
99. The rest mass of an electron is
with a velocity = 0.6
mass is
when it
then its
96. The ratio of Rydberg constant for helium to
the Rydberg constant for hydrogen is
1. 2 . 3
2. 3 . 2
The relation between three moduli of
elasticity is given by
1.
1 1 1
3. -
E N K
97. What percentage of original radioactive
atoms is left five half-lives?
1. 10
E N K
is more elastic in nature?
1. Ivory
2. Rubber
3. Aluminium
4. Wax
102. Crystals like diamond and silicon are brittle
because
1. they contain no dislocations
2. they are non-crystalline
3. the stress required to a
dislocation is high
4. they contain very few dislocations
103. The energy gap in diamond is
1. 5 . 4
2. 2-3
3. 1 . 1
4.
104. Pure silicon a t OK is an
1. intrinsic semiconductor
2. extrinsic semiconductor
3.
4. insulator
107. The entropy becomes zero a t for a
1. pure element
2. perfect crystal
3. solid solution
4. none of the above
108. A reaction takes 500 min in 1 min
respectively a t C and C. The time i t
would take a t C is
3. 10 min
4. 6 min
109. In a single component the
of phases that can coexist in
is
105. has a n energy gap of 1.43 The 1. 2
wavelength of the radiation emitted during
an electronic transition in will be in the
1. visible range
2. ultraviolet range
3. infrared region
4. X-ray range
2. 3
110. Boltzmann distribution law which governs
the distribution of atoms among the various
106. The entropy of mixing of 0.5
mole of Ni atoms
and 0.49 mole of Cu atoms on mole of sites
in is energy levels is given a s
111. Choose the correct statement
1. Thermal conductivity of a metal does
not vary with temperature
2. Thermal conductivity of a metal varies
as a function of temperature
3. Thermal expansion coefficients are
isotropic for all materials
4. Thermal vibration of atoms contribute
for electronic specific heat
112. The main raw material used for the
manufacture of porcelain is
1. Clay
2. Alumina
3. Zirconia
4. Silicon carbide
113. Rotary kiln is used to produce
1. Cement clinker
2. Sanitary ware
3. Ceramic tiles
4. Porcelain ware
114. Which of the following material is inorganic
graphite?
1. Aluminium nitride
2. Silicon nitride
3. Boron nitride
4. Silicon carbide
115. Lead oxide is widely used in glass industry to
make
1. Photosensitive glass
2. Translucent glass
3. Opaque glass
4. Radiation shield glass