QUESTION PAPER 3

1. a) Explain the terms “Meta centre” and “Centre of buoyancy” . (5 marks)
b) Explain the properties of gyroscope. (10 marks)
i. Gyro inertia ii. Precession or gyroscopic motion.
2. a) Define mechanical advantage, velocity ratio and efficiency as applied to machines.
Derive the relationship between them. (8 marks)
b) What do you understand by capillarity? Describe an experiment to find the
surface tension of water by capillary rise method. (7 marks)
3. a) State and prove the Bernoulli’s theorem for the flow of liquid and give its
Application. (10 marks)
b) What is difference between streamline and turbulent motion of liquids? (5 marks)
4. a) State Doppler effect in sound. Explain the following cases. (8 marks)
i. Listener approaching a stationary source.
ii. Listener and Source approaching each other.
b) An observer travels with constant velocity of 30 m/s towards a distant
source of sound, which has of 1000 Hz. Calculate apparent frequency of the sound
heard by the observer. What frequency is heard after passing the source of sound? (7 marks)
5. a) Explain anomalous expansion of water? How useful for aquatic life. (8 marks)
b) What is the principle of RADAR. (7 marks)
6. a) Explain with principal, diagram, the phenomenon of optical fiber. (10 marks)
b) Explain with principle, the working of periscope. (5 marks)
7. Write short note on: (15 marks)
i) Conduction ii) Convection iii) Radiation
Iv) First law of thermodynamics v) Second law of thermodynamic
8. a) Explain with principle ,construction and working of sextant. (10 marks)
b) Explain the phenomenon of “total internal reflection”. The refractive indices
of glass and water with respect to air are 3/2 and 4/3 respectively. What is
the refractive index of glass with respect to water? (5 marks)
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