Model questions for University practical examination
1. (a) Determine the wavelength of light of the given laser source using grating.
(b) Taking the wavelength of diode laser light as 690 nm, determine the average size of the particles of lycopodium powder by diffraction method.
(c) Determine numerical aperture and acceptance angle of an optical fibre.
2. Find the thickness of the given thin wire using Air-wedge method.
3. Find the velocity of ultrasonic waves in a liquid and wavelength of ultrasonic waves. Also find compressibility of the given liquid.
4. Taking the wavelength of mercury green line as 5461 A, estimate the number of lines per metre of the given grating. Using this, determine the other wavelengths present in the light emitted from the mercury vapour lamp.
5. Determine the thermal conductivity of the given cardboard using Lee’s disc apparatus.
6. Find the hysteresis loss in the transformer-core using BH curve unit.
7. Find the moment of inertia of the given circular disc and rigidity modulus of the material of the suspension wire using torsional pendulum.
8. Find the young’s modulus of the material of the given beam by non-uniform bending.
9. Find the young’s modulus of the material of the given beam by uniform bending.
10. Find the coefficient of viscosity of water using Poiseuille’s method.
11. Find the dispersive power of material of the prism using spectrometer.
12. Find the band gap of a semiconducting material of the given diode.
13. Determine the specific resistance of the given wire using Carey Foster’s Bridge.