C 14-dce-103-engg physics

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C14–CE–103/C14–CM–103
4016
BOARD DIPLOMA EXAMINATION, (C–14)
OCT/NOV—2016
DCE—FIRST YEAR EXAMINATION
ENGINEERING PHYSICS
Time : 3 hours ] [ Total Marks : 80
PART—A 4×10=40
Instructions : (1) Answer all questions.
(2) Each question carries four marks.
1. (a) Check the correctness of the equation v u as2 2
2- = using
dimensional analysis.
(b) Write dimensional formulae of the following :
(i) Work
(ii) Surface tension
2. (a) Define cross-product (vector product).
(b) Find the value of n, if $ $ $i j nk+ +2 and 4 2 2$ $ $i j k+ + are
perpendicular to each other.
3. (a) Define acceleration due to gravity. Write its SI unit.
(b) A projectile has an initial velocity 700 m/sec. What is its
maximum horizontal range? ( g = ×9 8 2
m sec/ )
4. (a) Write the conditions of simple harmonic motion.
(b) The displacement of a particle in SHM is given by
y t= +
æ
è
ç
ö
ø
÷5 10
4
sin
p
in SI unit. Find its (a) initial displacement
and (b) phase constant.
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5. (a) Write differences between ‘Universal Gas Constant (R)’ and ‘Gas
Constant (r)’.
(b) A gas at a pressure of 105 2
Nm-
is allowed to expand
isothermally until its volume is doubled. Find its final pressure.
6. (a) Write Sabine’s formula, explaining the terms involved in it.
(b) Write any two applications of echoes.
7. (a) Define stress and strain.
(b) Define angle of contact. What is the angle of contact for pure
water and clean glass?
8. (a) What is the effect of temperature on viscosity of liquids and
gases?
(b) Write the Poiseuille’s equation for the coefficient of viscosity,
explaining the terms involved.
9. (a) State Coulomb’s inverse square law in magnetism.
(b) Define magnetic induction field strength and write its unit.
10. (a) What is total internal reflection?
(b) Write any two applications of superconductivity.
PART—B 10×4=40
Instructions : (1) Answer any four questions.
(2) Each question carries ten marks.
11. (a) State and explain triangle law and polygon law of vectors
with neat diagrams. 6
(b) The resultant of two equal and mutually perpendicular
forces is 1414 newton. What is the magnitude of each
force? 4
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12. (a) Derive the expressions for the maximum height reached,
time of ascent and horizontal range of a body in oblique
projection. 6
(b) A stone is projected upwards from the top of a tower with a
velocity of 9·8 m/sec reaches the ground in 4 seconds. Find
the height of the tower. 4
13. (a) Define angle of friction. Derive the expression for the
acceleration of a body moving up on a rough inclined plane. 1+5
(b) Write any two advantages and disadvantages of friction. 4
14. (a) Define work, power and energy. Derive the expression for
the kinetic energy of a body. 3+4
(b) If the kinetic energy of a body is doubled, how does its
momentum change? 3
15. (a) Derive the expressions for velocity and acceleration of a
particle executing simple harmonic motion. 6
(b) Define seconds pendulum. Find the length of a seconds
pendulum. (g = 9·8 m/s2
) 1+3
16. (a) Define two specific heats of a gas, and show that
C C Rp v- = . 2+4
(b) The density of a gas at STP is 1·293 gram/litre. Find the
density of the gas at 77 °C temperature and 80 cm of Hg
pressure. 4
17. (a) Distinguish between musical sound and noise. 4
(b) Write any three applications of beats and Doppler effect. 6
18. (a) Define specific resistance. Describe an experiment for
determination of specific resistance of a wire using meter
bridge. 1+5
(b) The resistances in the left and right gaps of a meter bridge
are 10 ohms and 30 ohms. Find the balancing length of
meter bridge. 4
H H H
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