6. Surface Tension is due to-
A. Cohesion
B. Adhesion
C. Viscous force
D. the difference between cohesive and adhesive forces
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7. The least radius of gyration of a ship is 9 m and the meta-centric height is 750 mm. Find the time period of the oscillation of the ship?
A. 20.85 seconds
B. 42.41 seconds
C. 75.4 seconds
D. 85 seconds
8. When pressure drag over a body is large as compared to the friction drag, then the shape of the body is that of –
A. a bluff body
B. an aerofoil
C. a streamlined body
D. a 2-dimensional body
9. A block of aluminum having the mass of 12 kg is suspended by a wire and lowered until submerged into a tank containing oil of relative density 0.8. Taking the relative density of aluminum as 2.4, the tension in the wire will be (take g = 10 m/s²)?
A. 120 N
B. 80 N
C. 800 N
D. 1200 N
10. Streamline, path line and streakline are identical when the –
A. flow is steady
B. flow is uniform
C. flow is neither steady nor uniform
D. flow velocities do not change steadily with time