Question bank for properties

of matter and acoustics

Part A questions

Elasticity

1. Define elasticity and plasticity
2. Define stress and strain
3. Explain stress and strain diagram
4. What is elastic limit?
5. Define the elasticity applicable only to fluids
6. Define rigidity modulus of elasticity
7. Define young’s modulus of elasticity
8. Define bulk modulus of elasticity
9. Define Poisson’s ratio
10. State Hook’s law
11. Write the expression for the Poisson’s ratio in terms of elastic constants
12. What is a cantilever?
13. What is uniform bending
14. What is non-uniform bending
15. What is the difference between uniform and non uniform bending

Surface tension, viscosity, osmosis and diffusion

1. Define  surface tension and surface energy
2. Write an expression for the excess pressure inside the spherical bubble
3. What is the effect of temperature on the surface tension of a liquid?
4. Write two applications of surface tension.
5. Define coefficient of viscosity
6. What is the effect of temperature on the viscosity of a liquid?
7. What are the practical applications of viscosity?
8. Define osmosis
9. What is osmotic pressure
10. Define the term diffusion
11. State Fick’s law of diffusion
12. State Graham’s law of diffusion of gases
13. What is meant by effusion
14. Define the term transpiration

Waves, oscillations and acoustics

1. Define longitudinal and transverse waves
2. Define the terms wavelength, frequency, period and phase.
3. Define simple harmonic motion
4. Define forced oscillations.
5. Define damped oscillations.
6. What is resonance?
7. Give two examples of forced vibrations
8. Define ultrasonic wave.
9. State two properties of ultrasonic waves
10. Give two important applications of ultrasonic waves
11. What is magnetostriction effect?
12. What is piezoelectric effect?
13. What is reverse piezoelectric effect?
14. Define absorption coefficient of a materials
15. Define reverberation and reverberation time.

Part B questions

Elasticity

1. Explain stress-strain diagram
2. Calculate the work done in twisting a wire
3. Calculate the work done in stretching a wire
4. Derive the relation between elastic constants
5. Obtain an expression for twisting couple on a cylinder
6. Obtain an expression for the time period of cantilever oscillations
7. Derive and expression for the internal bending moment of a bar

Surface tension, viscosity, osmosis and diffusion

1. Write short note on the variations of surface tension with temperature
2. Describe an experiment to determine the viscosity of a liquid
3. Write short note on the variations of viscosity with temperature
4. Derive Poiseuille’s formula for viscosity by the method of dimensions
5. State the laws of osmotic pressure.
6. Write short note on osmosis and boiling point of a solution
7. Write short note on osmosis and freezing point of a solution

Waves, oscillations and acoustics

1. Derive an expression for the displacement, velocity and acceleration of a simple harmonic motion and hence deduce the equation for simple harmonic motion.
2. What are free, damped and forced vibrations
3. Discuss the applications of ultrasonic waves as NDT and SONAR.
4. What is acoustics of a building? Explain the factors affecting acoustics of a building.
5. Enumerate the features that an auditorium should have for good acoustics.

Part C questions

Elasticity

1. Describe an experiment with torsional pendulum to determine rigidity modulus of wire and moment of inertia of disc.
2. Define cantilever. Obtain an expression for the depression produced at its free end when the weight of the beam is negligible. Discuss various special cases.
3. Describe with relevant theory an experiment to determine Young’s modulus of a bar by cantilever depression method.
4. Describe an experiment to determine the young’s modulus of a material by non-uniform bending.
5. Describe an experiment to determine the young’s modulus of a material by uniform bending.

Surface tension, viscosity, osmosis and diffusion

1. Derive an expression for excess pressure inside a curved liquid surface. Discuss the variation of surface tension with temperature.
2. Describe the Jaeger’s method of studying the variation of surface tension of water with temperature.
3. Describe an experiment to determine the coefficient of viscosity of a liquid.
4. What is the principle of reverse osmosis? Explain the working of osmotic plant. What are the advantages of reverse osmosis?

Waves, oscillations and acoustics

1. Derive an expression for displacement due to forced vibrations. Also obtain an expression for amplitude and resonance.
2. Explain the theory of damped vibrations and discuss the applications of damped oscillations.
3. Describe the principle, construction and working of piezoelectric oscillator.
4. Explain how ultrasonics are produced in a magnetostriciton oscillator
5. Describe with necessary theory a method of measuring reverberation time.
6. Derive Sabine’s formula for the reverberation time of a building.