2017 Level-1 Term-I Physics-I exam (PHY-101) from BUTEX affiliated colleges. Questions cover continuity and Bernoulli equations, viscosity by capillary flow, soap bubble pressure, rolling disc kinetic energy, and flywheel radius of gyration.
Level-1 Term-I, Final Exám-2017
Subject: Physics-I, Subject 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) What is streamline motion?
(b) State equation of continuity.
(c) Explain Bernoulli’s theorem.
(d) Water flows through a horizontal pipe line of varying cross-section at the rate of 0.2 m³/s. Calculate the velocity of water at a point, where the area of cross section of the pipe is 0.02 m².
[1+2+6+3=12]
2. (a) Define coefficient of viscosity and velocity gradient.
(b) Describe the determination of coefficient of viscosity of a liquid by the capillary flow method.
(c) A metal plate of area 10⁻²m² rests on a layer of castor oil 2×10⁻³m thick, whose coefficient of viscosity is 1.55 N-s/m². Calculate the horizontal force required to move the plate with a uniform speed of m/s.
[2+7+3=12]
3. (a) What is cohesive force?
(b) Derive an expression for the pressure in a cylindrical soap bubble.
(c) State and prove the theorem of perpendicular axis in moment of inertia.