Physics-I paper (PHY 101) from BUTEX affiliated colleges' 2024 Level-1 Term-I finals. Problems include Bernoulli's theorem with venturimeter application, elastic energy in stretched wires, Poiseuille's equation, and Poisson's ratio derivations.
Level-1 Term-I, Final Exám-2024
Subject: Physics-I (Code: PHY 101)
Time: 3.0 Hrs. Full Marks: 72
(Use separate answer script for Part: A and Part: B)
(All parts of a question must be answered consecutively)
Part: A
(Answer any three questions)
1. (a) State and prove Bernoulli’s theorem for a liquid along a stream line.
(b) Applying Bernoulli’s theorem show that, exhaust velocity of liquid is √(2gh).
(c) What is venturimeter? How do the rates of liquid flow can be measured by this?
[4+4+4=12]
2. (a) Define elasticity with examples.
(b) Show that the work done per unit volume in straining a body is equal to 1/2(stress × strain).
(c) Find the work done in stretching a wire of 1 sq mm cross section and 2 m long through 0.1 mm. [Y= 2×10¹¹ N/m²].
[3+5+4=12]
3. (a) Define viscosity and critical velocity.
(b) Derive Poiseuille’s equation for the rate of flow of a viscous liquid through a capillary tube.
(c) Explain Newton’s law of viscous flow and co-efficient of viscosity.