Maharashtra State Board of Technical Education 2011-1st Sem Diploma Civil Engineering for All Branches of in EngineeringSubject :- basic physics(12001) - Question Paper
MSBTE ques. paper for All Branches of Diploma in Engineering
First Semester
Subject :- basic physics(12001)
12001
3 Hours / 100 Marks Seat No.
Instructions - (1) All Questions are compulsory.
(2) Answer each next mam Question on a new page.
(3) Illustrate your answers with neat sketches wherever necessary.
(4) Figures to the right indicate full marls.
(5) Assume suitable data, if necessary.
(6) Use of Non-programmable Electronic Pocket Calculator is permissible.
(7) Mobile Phone. Pager and any other Electronic Communication devices are not permissible in
Examination Hall.
Marks
1. Attempt any TEN of the foDowing : 20
a) Define derived physical quantity. Give two examples.
b) What is elasticity property and elastic body ?
c) State factors which affect angle of contact for a liquid or fhiid.
d) Give statement for Newtons Law of Viscosity.
e) We do not receive heat from the sun by conduction, give reason.
f) Write SI unit for coefficient of thermal conductivity.
g) State Snells law for refraction of light.
h) State any two Engineering applications of LASER.
P.T.O.
12001 [2]
Marks
i) Define the terms wavelength and frequency, for a sound wave.
j) Draw a neat labelled diagram fix Photoelectric cell.
k) A metal rod of length 100 cm is heated up to 100C, its
length increases by 0.002 m Find coefficient of linear expansion of metal.
1) Fundamental vibrations are observed for a air column closed at one end for frequency 512 Hz and resonating length 16 cm. Calculate velocity of sound in air medium. Neglect end correction.
2. Attempt any FOUR of the following : 16
a) Define accuracy and precision. Differentiate between them
b) The length of an object measured by vermer-caliper is 10 0.02 cm, calculate die percentage error.
c) Using the behaviour of uniform cross section material wire under continuously increasing load by stress-strain curve, define
(i) Elastic-stresslimit
(ii) Yield stress
(iii) Flow-character
(iv) Breaking stress
d) A weight exerts force of 100 N on steel wire of cross sectional area of Am2. If the extension produced is 2mm, for 5m length of wire then find the diameter of wire. (Y = 2 * 1011 N/m2)
e) What is capillarity phenomenon ? Define sphere of influence and molecular range.
f) What are the types of errors in physical measurement ? Give formula for percentage error.
Marks
12001 [3]
3. Attempt any FOUR of the following : 16
a) State types of stresses. State SI unit of stress.
b) Define Surface tension. What is the effect of temperature and impurities on surface tension.
c) Define types of flows in liquid using Reynolds number. Give its physical significance.
d) Distinguish conduction, convection and radiation process fix heat exchanges.
e) A plate of copper 4mm thick has temperature difference of 32C between its faces. It transmits 250kcal/hr through an area of 5cm2. Calculate the thermal conductivity of copper.
f) Define linear, aerial, cubical expansion coefficients with their unit. State relation between them
4. Attempt any FOUR of the following : 16
a) State Boyles Law, Charles Law and Gay-Lussacs Law for gases. Define absolute zero.
b) Find the volume of a gas at 27C and pressure of 70cm of mercury, if the gas has volume of 2 liters at 17C and pressure of 60cm of mercury.
c) What is the steady state of temperature ? Define temperature gradient. Give its unit.
d) Length of Nickel rod at 0C is 90 cm. When heated upto 100C, its length increases by 1.4 * 10~2 cm. Find the coefficient of Aerial expansion.
e) Draw diagram with neat labels showing Diffraction and Polarization of light.
f) State the conditions and experimental setup for generating a good interference pattern.
P.T.O.
12001 [4]
Marks
5. Attempt any FOUR of the following : 16
a) State the concept of population inversion and optical pumping in LASER.
b) Describe construction and working of He-Ne LASER.
c) State Four characteristics of longitudinal waves.
d) (i) What is resonance effect ?
(ii) Draw a neat labelled diagram showing fundamental mode of vibration in air column closed at one end.
e) State properties of LASER.
f) Define :
(i) Stationery wave
(ii) Node and antinode
(iii) Free and forced vibration
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