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University of Barishal

Department of Computer Science and Engineering

Final Exam

Course Title: Physics (PHY-1105)

Semester: 1st | Session: 23-24

Time: 180 minutes | Marks: 60.00

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Answer any five (5) from the following questions. Parts of same question should be answered consecutively.

1.

a)

Define temperature and heat. Derive an expression for the mean kinetic energy of a gas molecule using the kinetic theory of gases.

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4 Marks
b)

Write down Maxwell's four thermodynamics relations. Use one of these to obtain Clausius- Clapeyron's latent heat equation.

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5 Marks
c)

A carnot's engine absorbs 104 calories of heat from a reservoir at 627° C and rejects heat to a sink at 27º C. What is its efficiency? How much work does it perform? [J = 4.2 J/Calorie]

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3 Marks
2.

a)

Define single crystal and polycrystalline solids. Distinguish between amorphous and crystalline solids.

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4 Marks
b)

Define unit cell. Prove that the interplanar spacing d of a plane (h, k, 1) in a simple cubic lattice is given by-

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4 Marks
c)

Draw the NaCl crystal structure and determine the total number of Na+ and Cl- ions per unit cell.

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4 Marks
3.

a)

What are free and forced vibrations? Explain the effect of damping on harmonic oscillations.

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4 Marks
b) Write short notes on i) Phase velocity ii) Wave velocity

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5 Marks
c)

A simple pendulum of length 80 cm makes 120 swings in 160 s on a distant planet. Find the acceleration due to gravity on this planet.

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3 Marks
4.

a)

What are coherent sources? Derive the condition for bright and dark fringes in Young's double-slit experiment.

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5 Marks
b)

What is optical activity? Differentiate between Fresnel and Fraunhofer diffraction.

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4 Marks
c)

In Young's double-slit experiment, the slit separation is 1 mm, and the screen is 1.5 m away. If the light wavelength is 600 nm, determine the fringe width.

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3 Marks
5.

a)

Define entropy. Show that entropy remains constant in a reversible process but increases in an irreversible process.

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4 Marks
b)

Derive an expression for the pressure of an ideal gas and show that:

Where symbols have their usual meanings.

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4 Marks
c)

Explain the following: Seebeck effect, Brownian motion, and Pyrometer.

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4 Marks
6.

a)

What is X-ray Diffraction? Write down some applications of X-ray Diffraction.

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3 Marks
b)

Derive Bragg's law for x-ray diffraction. Write down its application.

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5 Marks
c)

Distinction among conductor, semiconductor and insulator based on band theory

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4 Marks
7.

a)

What is simple Harmonic motion? Write down the characteristics of simple harmonic motion. Explain the nature of L-T2 curve.

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4 Marks
b)

Show that in simple harmonic motion conservation principle of energy is observed.

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5 Marks
c)

Derive the differential equation of simple harmonic motion.

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3 Marks
8.

a)

What is Brewster's law? Derive the Formula for Brewster angle.

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4 Marks
b)

What is interference? What are the conditions for constructive and destructive interference?

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4 Marks
c)

Write down short notes on i) Nicol prism and ii) Newton's ring

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4 Marks
View 30 Topic-wise Questions for this Course

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