8. Properties of Solids and Liquids

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Prepared by Vinodkumar M, HSST Physics, St. Aloysius HSS, Elthuruth, Thrissur

1. Match the following *

4 points

Equation of continuity

Surface tension

Archimedes Principle

Viscosity

Bernoulli's Principle

Pressure

Magnus effect

Action of Detergent

Reynold's number

a1v1 = a2v2

2. Bubbles of air rise up through water because *

1 point

Surface tension and adherence

Viscosity and buoyancy.

Air current over the liquid and buoyancy

Up thrust and surface tension.

3. The terminal velocity of a copper ball of radius 2.0 mm falling through a tank of oil at 20 degree celsius is 6.5 cm/s. Compute the viscosity of oil at 20 degree celsius. Density of oil is 1.5 x 10^3 kg/m^3, density of copper is 8.9 x 10^3 kg/m^3. *

2 points

9.9 Nsm^−2

10 Nsm^−2

0.86 Nsm^−2

0.99 Nsm^−2

4. Viscosity of gases ..............with temperature, whereas viscosity of liquids ..................with temperature. *

2 points

decreases increases

increases, decreases

5. Within elastic limit, stress ∝ strain. This is ......... *

1 point

Hooke's law

Pascal's law

Cooling law

Newton's law

6. The value of angle of contact for pure water *

1 point

0 degree

18 degree

8 degree

90 degree

7. The work done in breaking a water drop of radius 1 mm to 1000 droplets. Surface tension of water = 72 x 10 ^-3 N/m. *

3 points

9.4 x 10^-6 J

8.14 x 10^ -6 J

81.4 x 10^-6J

94 x 10^-6 J

8. Pressure in a liquid is *

1 point

Vector

Scalar

9. The law associated with liquid pressure *

1 point

Newton's law

Pascal's law

Law of equipartition of energy

Hooke's law

10. Blood pressure in humans is greater at the feet than at the brain because............. *

1 point

The height of the blood column in the human body is more at barin than at the feet

Feet is long

Brain is small

The height of the blood column in the human body is more at feet than at the brain

11. Pick the odd one out *

1 point

venturimeter

Dentist chair

hydraulic press

hydraulic brake

12. Pick the odd one out *

1 point

Aerofoil

Atomiser

Venturimeter

Hydraulic lift

13. From graph, which material is more ductile? *

1 point

14. In the above graph, which materiel is preferred for making springs? *

1 point

15. In the given figure, when air is blown between the two balls, they................ *

1 point

Repel

Attract

16. When a thin tube is dipped in water, water rises through the tube. This phenomenon is ............. *

1 point

Viscosity

Capillary rise

None of these

Pascal's law

17. The viscosity of gas decreases with increase in temperature *

1 point

False

True

18. The speed time graph of a falling sky diver is shown below. Which part of the graph shows the sky diver falling with terminal velocity? *

1 point

19. A drop of liquid under no external forces is always spherical in shape. *

1 point

False

True

20. Two soap bubbles A and B are blown at the ends of a tube as in figure. When the block C is removed, *

1 point

The size of A increases and that of B decreases

The size of B inceases and that of A decreases

Their sizes become equal

No change occur to their sizes

21. What is the stress developed in a metal wire when it is strained by 30%. Given Young's modulus of material is 200 GPa. *

2 points

120 GPa

90 GPa

30 GPa

60 GPa

22. Ropes of cranes is made up of a number of thin wires braided together because............... *

1 point

To reduce stress

Option 4

To reduce load

To reduce material

To reduce area

23. The point on a rigid body where the whole mass of the body is assumed to be concentrated........ *

1 point

Mass point

Centre of gravity

Centre of mass

Moment of inertia

24. In a capillary tube water rises to a height h. If the tube is inclined at an angle of 60 degree with the vertical, what will be the length of water column in the tube? *

2 points

h√2

h/2

h/√2

25. From the table select the material which shows more elasticity *

1 point

26. A steady flow of non viscous fluid is shown in figure. Identify the figure which is wrong. *

1 point

Figure 1

Figure 2

27. The SI unit of pressure *

1 point

dyne

N/m^2

Nm^2

28. Fluid friction is called......... *

1 point

continuity

Surface tension

Viscosity

Capillarity

29. The ratio of shearing stress to shearing strain *

1 point

Rigidity modulus

Young's modulus

Bulk modulus

Poission's ratio

30. A tank of 5 m height is filled with water. Calculate the velocity of efflux through a hole 3 m below the surface of water. *

2 points

766 m/s

7.66 m/s

76.6 m/s

0.766 m/s

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