Online MCQs Quiz Unit-6: Fluid Dynamics

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HSSC-1 (Class-11) Physics (New Book/KPK Text Board, Peshawar)

1. For substances that do not flow easily (like honey) have the value for the coefficient of viscosity

10 points

A. low

B. high

C. zero

D. negative

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2. A unit for viscosity, the centipoise, is equal to which of the following

10 points

A. 10⁻³ N s/m²

B. 10⁻² N s/m²

C. 10² N s/m²

D. 10³ N s/m²

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3. Stokes law is applicable only if a body is moving through a liquid slow speed and has ______ shape.

10 points

A. a cubical

B. a spherical

C. a rough

D. any

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4. The net force that acts on a 10 N falling object, when it encounters 4 N of air resistance is

10 points

A. 0 N

B. 4 N

C. 6 N

D. 10 N

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5. A skydiver jumps from a high-flying helicopter. Before reaching terminal velocity, her acceleration

10 points

A. increase

B. decrease

C. remain the same

D. is zero

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6. At terminal velocity the acceleration of a falling object is

10 points

A. 0 m s⁻²

B. 1 m s⁻²

C. -9.8 m s⁻²

D. 9.8 m s⁻²

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7. According to equation of continuity Av = constant. This constant is equal to :

10 points

A. volume of fluid

B. mass of fluid

C. density of fluid

D. volume flow rate

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8. At the constriction in the cross-section for ideal flow, from equation of continuity it follows that, the speed of fluid is

10 points

A. greater

B. less

C. same

D. zero

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9. As water in a level pipe passes from a narrow cross section of pipe to a wider cross section, the pressure against the wall

10 points

A. increases

B. decreases

C. remains the same

D. is zero

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10. A 4 m high tank filled with water is drilled with four identical small holes at 1 m, 1.5 m, 2 m and 2.5 m from the bottom of tank, the speed of efflux will be greatest from the hole at

10 points

A. 1 m

B. 1.5 m

C. 2 m

D. 2.5 m

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11. Venturi metre is a device used to measure the

10 points

A. mass of fluid

B. speed of fluid

C. viscosity of fluid

D. density of fluid

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12. A certain pipe has a cross-sectional area of 0.0001 m² in which water is flowing at 10 m/s. The volume flow rate is :

10 points

A. 0.00001 m³/s

B. 0.001 m³/s

C. 1 m³/s

D. 10.0001 m³/s

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13. At sufficiently high speeds the flow of viscous fluid becomes

10 points

A. unexpected

B. stream line

C. non-viscous

D. turbulent

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14. The water in the tank is 10 m above the teak point. The speed with which the water emerge from the teak is

10 points

A. 10 m/s

B. 14 m/s

C. 194 m/s

D. 0.1 m/s

Clear selection

15. When the radius of the artery is reduced, the blood pressure

10 points

A. increased

B. decreased

C. remains the same

D. is zero

Clear selection

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