Q. 7 A metallic rod of 500 mm length and 50 mm diameter, when subjected to a tensile force of 100 kN at the ends, experiences an increase in its length by 0.5 mm and a reduction in its diameter by 0.015 mm. The Poisson's ratio of the rod material is Q. 9 A circular object of radius r rolls without slipping on a horizontal level floor with the center having velocity V. The velocity at the point of contact between the object and the floor is (A) zero (B) V in the direction of motion (C) V opposite to the direction of motion (D) V vertically upward from the floor Q. 10 For the given statements: I Mating spur gear teeth is an example of higher pair II A revolute joint is an example of lower pair Indicate the correct answer. (A) Both I and II are false (B) I is true and II is false (C) I is false and II is true (D) Both I and II are true Q. 12 Biot number signifies the ratio of (A) convective resistance in the fluid to conductive resistance in the solid (B) conductive resistance in the solid to convective resistance in the fluid (C) inertia force to viscous force in the fluid (D) buoyancy force to viscous force in the fluid Q. 13 The maximum theoretical work obtainable, when a system interacts to equilibrium with a reference environment, is called (A) Entropy (C) Exergy (B) Enthalpy (D) Rothalpy Q. 14 Consider a two-dimensional laminar flow over a long cylinder as shown in the figure below. U T 2 3 T The free stream velocity is U. and the free stream temperature To is lower than the cylinder surface temperature Ts. The local heat transfer coefficient is minimum at point (A) 1 (C) 3 (B) 2 (D) 4