Physics, Unit # 17, Physics of Solids, Ch # 17, F. Sc Part-II
1.
An element /compound with a
definite volume and shape is called a
a. Symmetric substance b. Liquid c.
Solid d. Gas
2.
A solid having regular arrangement
of molecules throughout its structure is called
a. Super solid b. crystalline solid c.
Perfect solid d. Plasma
3.
A solid having irregular
arrangement of molecules is called
a. Polymeric b. amorphous solid c.
Ideal solid d.
none
4.
Identify the polymer substance
among the following
a. Glass b.
Iron c.
Plastic d.
All of these
5.
A crystal lattice is
a. random arrangement of atoms in a crystal
b. An order arrangement of points in space at which the atom, ions
or molecule are positioned
c. A random arrangement of molecules but orderly arrangements of
atoms
d. A piece of crystal
6.
When the temperature of a
semiconductor is increased, its electrical conductor is increased, its
electrical conductivity
a. Increases b. Remains the same c.
Decreases d. First increases than decreases
7.
A semiconductor device is
connected in a series circuit with a battery and a resistance. A current is
found to pass through the circuit the polarity of the battery is
reversed, the current drops almost to zero. The device may be
a. a p-type semi
conductor b. an n-type Semi conductor
c.
a Pn junction d. An intrinsic semi conductor
8.
Identify the crystalline solids
among the following
a. Graphite b. Diamond
d. All of these
9.
Definite geometry in a crystalline
solid repeats itself along
a. one dimension b.
Along two dimensions
c.
Along three dimensions d. All of the above
10.
Crystal lattice is a
a. 3-D arrangement of particles at their position b.
2 D arrangement of particles
c.
1-Darrangement of particles d. All of the above
11.
The smallest part of a crystal
lattice is called
a. An ion b. A molecule c.
an Atom d.
a unit cell
12.
Polymers may consist of
a. Carbon b.
Combination of C + O2
c.
Combination of C, 02, H2, N2, Cu, Fe
etc d. None of these
13.
Crystal structure of NaCl
a. Trigonal b. Cubical c. hexagonal d. Monoclinic
14.
The atoms in a solid are held
together by
a. Adhesive force b. Cohesive force c. Solid force d.
resistive force
15.
An external deforming force
applied on a crystal may changes its
a. Shape only b. Length only c. Volume only
d. All of the above
16.
The characteristics of crystals
can be studied by the use of
a. X-rays b. Sound waves c.
Infra-red rays d. all of these
17.
The ability of anybody to return
to its original shape is called
a. Elasticity b. Elastic force c.
Stress d.
Strain
18.
The SI unit of stress is
a. N/m2 b.
Nm c.
dynes/m d.
N
19.
The measure of deformation in a
certain solid due to the-action of stress is called
a. Hook’s Law b. mechanical advantage c.
Stress d.
Strain
20.
The S1 unit of strain is
a. N b. Dynes c.
Pascal d.
Dimensionless
21.
A solid subjected to deformation
along one dimension
a. Only have tensile stress b. Only have compressive stress
c.
Have both tensile and compressive stress
d.
None of the above
22.
A stress which increases the
length along one dimension only is called
a. Compressive stress b. Only have compressive stress
c.
Have both tensi1e and compressive stress
d. None of the above
23.
Stress can be classified into
a. Linear and compressive stress
b. Linear and shear stress
c.
Linear compressive and shear stress d.
All of the above
24.
Doping of a semi conductor (with
small traces-of impurity atoms) generally changes the resistivity as
follows
a. increases b. Does not alter c. Increases d. May increases or decreases depending on the
dopant
25.
On increasing the reverse bias to
a large value in a Pn junction diode, the current
a. Increases slowly b. Remains fixed c. 1ncreases suddenly d. Decreases slowly
26.
The strain is the ratio of
a. stress / strain b. strain / stress c. Force / Area d. Change in length/ Original length
27.
The depletion layer in the PN
junction region is caused by
a. drift of holes b. diffusion of carries c. migration of impurity d. drifts of electrons
28.
The ratio of stress / strain is
called as
a. Modulus of elasticity b. Young's modulus c.
Bulk modulus d. Shear Modulus
29.
The ratio of tensile Stress to
tensile strain
a. Force b.
Young's modulus c.
Bulk Modulus d. Shear Modulus
30.
In insulators
a. the valence band is partially filled with electrons b. the conductance band is partially filled
with electrons
c. The conductance band is filled with electrons ad the valence
band is empty
d. the construction band is empty and the valence band is filled
with electrons 31. Which of the following is not a properly of a crystalline
solid?
a.
Sharp melting point b. Flat surfaces
c.
Isotropic electric conductivity d.
Long range order.
32.
What makes a solid possess a
definite shape?
a. Negligibly small thermal motion
b. long range order
c.
Higher Kinetic energy of molecules d. None of the above
33.
The ratio of volumetric stress to
volumetric strain is called
a. Young' modules b. Bulk modulus c. Shear modulus
34.
The SI unit of stress is same as
that of
a. Momentum b. Pressure
c. Force d.
Length
35.
Crystals are classified into
a. 3 groups b. 4 groups c. 7 groups d.
infinite
36.
Seven system I groups were
classified by
a. Hook’s Law b.
August Braves c.
Young's d.
Bragg's
37.
The greatest stress that a
material can bear without any permanent change in its shape or dimension is
called permanent
a. Super stress b. Infinite stress c.
Stress d. Proportional limit
38.
Point out ductile substance among
the following
a. Wrought Iron b. Copper c.
Lead d.
All of these
39.
A solid with intermediate
crystalline order is called
a. Plasma b. Polymeric solid c.
amorphous solid d. All of the above
40.
The characteristics of crystals
can be studied by the use of
a. X-rays b. Sound waves c. Infrared rays d. All of above
41.
If the electron is hydrogen atom
jumps from the third orbit the second orbit, the emitted radiation has
wavelength
(R is Rydberg's
constant)
a. 36/5R b.
5R/36 c. 6/5R d.
5R/6
42.
Nylon breaks when the stress
within it reaches 1x109 Pa. Which range includes the heavies load
that could be lifted by a nylon thread of diameter1mm?
a. 2N to 20N b. 20N to 200N c.200N
to 2000N d. 2000N to 20000N
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