HSSC-1 (Class-11) Solved Physics MCQs; Unit-6: Fluid Dynamics;  (New Book/KPK Text Board, Peshawar) With Verified Answers 


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




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




... Answer is A. 10⁻³ 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.




... Answer is B. a spherical
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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




... Answer is D. 6 N
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5. A skydiver jumps from a high-flying helicopter. Before reaching terminal velocity, her acceleration




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




... Answer is A. 0 m s⁻²
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7. According to the equation of continuity Av = constant. This constant is equal to :




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




... Answer is A. greater
Given: ---------------------------------


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




... Answer is A. increases
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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 the tank, the speed of efflux will be greatest from the hole at




... Answer is A. 1 m
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11. Venturi meter is a device used to measure the




... Answer is B. speed of the 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 :




... Answer is B.  0.001 m³/s
`\ frac {ΔV}{t}` = Av = 0.0001 m² x 10 m/s = 0.001 m³/s


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




... Answer is D. turbulent
Given: -------------------------


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




... Answer is B. 14 m/s
V = `\ sqrt {2gh} = `\ sqrt {2 x 10 ms⁻² x 10 m}` = 14 m/s


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




... Answer is B. decreased
Given: -----------------------------



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