Question Bank No: 1

1. Total area of crossection is 0.25m2.If blood is flowing at the rate of 100 cm3/S then the average velocity of flow of blood through cappilaries (in mm/s)

 a)0.4
 b)4
 c)25
 d)400

2. Under a pressure head,the rate of orderly volume flow of liquid through capillary tube is Q.If the length of capillary tube were doubled and the diameter of the bone is halved.The rate of flow became.

 a)Q/4
 b)16Q
 c)Q/8
 d)Q/32

3. For flow of a fluid to be turbulent

 a)Fluid should have high density
 b)Critical velocity should be large
 c)Reynold number should be less than 2000
 d)All the above

4. After terminal velocity is reached, the acceleration of body flowing through viscous fluid is

 a)Zero
 b)equal to g
 c)less than g
 d)more than g

5. A ball of mass m and radius r is released in a viscus liquid .The value of its terminal velocity is proportional

 a)1r
 b)mr
 c)mr
 d)m only

6. A liquid disturbed by stirring comes to rest after some time due to

 a)Surface tension
 b)Stability
 c)Viscocity
 d)attraction forces between molecules

7. Two hail stones with radii in the ratio of 1:2 fall from a great height through the atmosphere.Then their terminal velocities are in the ratio of

 a)1:2
 b)2:1
 c)1:4
 d)4:1

8. The force of viscosity

 a)gravitational
 b)weak
 c)electromagnetic
 d)nuclear

9. If more air is pushed in a soap bubble the pressure i it

 a)decreases
 b)becomes zero
 c)remains same
 d)increases

10. The surface tension of a liquid is 5 newton per metre. If a film is held on a ring of area 0.02m2,its surface energy is about

 a)5×10−2joule
 b)2.5×10−2joule
 c)2×10−2joule
 d)3×10−1joule

11. Kerosene oil rises up in a wick of lantern because of

 a)diffusion of the oil through the wick
 b)Surface tension
 c)buoyant force of air
 d)gravitational pull of the wick

12. A small hollow rectangular vessel having a small circular hole it its base of radius Rmm immersed in a tank of water.Water will start coming into the vessel.When it is immersed to a depth of

 a)T49R
 b)T980R
 c)T245R
 d)T1960R

13. The height of a barometer filled with a liquid of density 3.4g /cc under normal condition is approximately

 a)8m
 b)5m
 c)3m
 d)1m

14. A common hydrometer reads specific gravity of liquids. Compared to the 1.6 mark of the stem the mark 1.5 will be

 a)upwards
 b)downwards
 c)in the same place
 d)may be upward or downward depending upon the hydrometer

15. The air pushed down by the wings of the parrot while flying will go out of the wire cage due to which weight decreases

 a)θ=Cos−1ga
 b)θ=tan−1ag
 c)θ=sin−1ag
 d)θ=tan−1ga

16. A parrot sitting on the floor of a wire cagfe which is being carried by a boy, starts flying.The boy will feel that the box is now

 a)heavier
 b)lighter
 c)shows no change in weight
 d)lighter in the beginning and heavier later

17. For a given material the young's modules is 2.4 times of modules of rigidity.its poisson's ratio is

 a)0.2
 b)0.4
 c)0.6
 d)0.8

18. An iron bar of length L, cross- section A and Young's modules Y is puppled by a force F from both ends so as to produce an elongation l.Which of the followingstatement is correct?

 a)l ∝Y
 b)l ∝YA
 c)l ∝A
 d)l ∝1L

19. The two rods of the same material,whose radii are in the ratio 1:3 are twisted by applying equal torque on them.The ratio of twists produced in the rods will be

 a)81:1
 b)27:1
 c)18:1
 d)9:1

20. The relation between young's modules (Y) modules of rigidity (μ) and poisson's ratio is

 a)Y=2μ(1−σ)
 b)Y=2μ(1+σ)
 c)Y=μ(1−2σ)
 d)Y=2μ(1+2σ)

21. The upper end of a wire of radius 4mm and length 100 cm is clamped and its other end is twisted the angle an angle of 300.The angle of shear is

 a)120
 b)1.20
 c)0.120
 d)0.0120

22. The shear modules of elasticity of a liquid is

 a)infinity
 b)unity
 c)Some finite, honzero const
 d)zero