11. A concrete block 2 m high, 2 m wide and 1 m thick is used for holding mud at one side
of the block as shown in the Fig. 1. The density of concrete is 2500 kg/m? while the
density of the mud is 1600 kg/m*. Take specific weight of water as 10 10/1723. If the co-
efficient of friction between the ground and the concrete block is 0.16, then the mud
height(h) at which the block will start to slide is

Concrete block

ച്‌ Mud

||

Fig. 1
(A) lm (8) 15m (0 2m (D) lim

12. For the cylindrical log of wood freely floating in water as shown in Fig. 2, go through the
following statements

Diameter D

Fig. 2
I. ൧൭ the depth of submergence increases the metacentric height decreases
II. ൧൭ the depth of submergence increases the buoyancy height from centre decreases
III. Irrespective of the depth of submergence the body is in stable equilibrium

IV. Irrespective of the depth of submergence body is always in neutral equilibrium
Choose the correct statement combination out of the above :

(A) 1811 ®) 1೬11 (C) IVonly (D) ۷

> ۸ ۸
13. The velocity in m/s at a point in a two dimensional flow is given ೩ V = 37 + 47. The
equation for stream line passing through the point is

(A) 30+ —4ydy = 0 (8) 44+ - 304 = 0
(ಲ) ‏م40‎ + 30 = 0 (2) 4ydx + 3xdy=0

00202 = ` 4 «^