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WorksheetsPH8151 Model Exam Part-A
Total questions: 30
Worksheet time: 3600secs
Name
Class
Date
1.
Is Hooke’s law valid for plastic material?
a)
Yes
b)
No
c)
Valid with some modification
d)
Only for some materials
2.
Ductile material has
a)
large elastic limit
b)
less elastic limit
c)
large plastic region
d)
less plastic region
3.
When temperature of material increases elasticity
a)
Increases
b)
Initial decreases and at high temperature it increases
c)
Decreases
d)
Constant
4.
I beam has more bending moment at
a)
Web
b)
Upper flange alone
c)
Lower flange alone
d)
Both upper and lower flanges
5.
Which is the strong shaft?
a)
Sold shaft
b)
hollow shaft
c)
shaft with square cross section
d)
I shape shaft
6.
What are the units of torsional rigidity?
a)
Newton per metre square
b)
meter per Newton square
c)
Newton per meter
d)
Newton
7.
Which law is used for achieving the relation between the Einstein’s coefficients?
a)
Heisenberg’s Uncertainty Principle
b)
Planck’s radiation law
c)
Einstein’s equation
d)
Quantum law
8.
Einstein states that
a)
rate of stimulated emission is equal to the rate of stimulated absorption
b)
rate of spontaneous emission is equal to the rate of stimulated absorption
c)
probability of spontaneous emission is equal to the probability of stimulated absorption
d)
probability of stimulated emission is equal to the probability of stimulated absorption
9.
_______ property of laser beam allows to be rapidly modulated for communications.
a)
Monochromatic
b)
Coherence
c)
No divergence
d)
Brightness
10.
Which impurity is added to gallium phosphide to make it an efficient light emitter?
a)
Silicon
b)
Hydrogen
c)
Nitrogen
d)
Phosphorus
11.
In homojunction semiconductor, light is confined in the active region due to
a)
increase in refractive index
b)
increase in diffraction
c)
increase in interference
d)
increase in thickness of depletion layer
12.
Which of the following loss occurs inside the fibre?
a)
Radiative loss
b)
Scattering
c)
Absorption
d)
Attenuation
13.
Thermal conductivity of bad conductors is measured by
a)
Searle's method
b)
Forbe's method
c)
Lee's disc method
d)
all of the mentioned
14.
The transfer of heat between a wall and a fluid system in motion is called
a)
radiation
b)
convection
c)
conduction
d)
none of the mentioned
15.
Under steady state, the temperature of body
a)
Remains the same
b)
Increases with time
c)
Decreases with time
d)
First decreases then increase
16.
Why is invar used in bimetallic strips?
a)
Low density
b)
Low coefficient of expansion
c)
High-temperature resistance
d)
High abrasion resistance
17.
Which of these materials is not used for resistance coils?
a)
Nickel
b)
Copper
c)
Titanium
d)
Platinum
18.
Mark the matter with least value of thermal conductivity
a)
Air
b)
Water
c)
Ash
d)
Window glass
19.
As the wavelength of the radiation decreases, the intensity of the black body radiations
a)
Increases
b)
Decreases
c)
First increases then decrease
d)
First decreases then increase
20.
The radiations emitted by hot bodies are called as
a)
X-rays
b)
Black-body radiation
c)
Gamma radiations
d)
Visible light
21.
The law governing the distribution of radiant energy over wavelength for a black body at fixed temperature is referred to as
a)
Kirchhoff’s law
b)
Planck’s law
c)
Wein’s formula
d)
Lambert’s law
22.
Square of the wave function of the particle describe
a)
electromagnetic energy
b)
mechanical energy
c)
Probability density
d)
momentum
23.
In STM, metallic needle is at a ______________ potential with respect to the surface of sample
a)
positive
b)
negative
c)
zero
d)
infinite
24.
The Energy of the particle is proportional to
a)
n
b)
n-1
c)
n2
d)
n-2
25.
Which of the following is a property of Miller indices?
a)
They uniquely identify a plane
b)
They are always positive
c)
They are not fractions
d)
None of the mentioned
26.
Energy operator is
a)
ih (∂/∂t)
b)
ћ (∂/∂t)
c)
h (∂/∂t)
d)
iћ (∂/∂t)
27.
Amorphous solids have structure
a)
Regular
b)
Linear
c)
Irregular
d)
Dendritic
28.
Which of the following is not an amorphous material?
a)
Glass
b)
Plastics
c)
Lead
d)
Rubbers
29.
Bravais lattice consists of space lattices.
a)
Eleven
b)
Twelve
c)
Thirteen
d)
Fourteen
30.
The axial relationship of a rhombohedral crystal system is given as
a)
a = b = c
b)
a = b ≠ c
c)
a ≠ b = c
d)
a ≠ b ≠ c
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