HSSC-I (Class-11) Solved Physics MCQs; Unit-6: Fluid Mechanics (Baluchistan Textbook Board, Quetta) With Verified Answers: 



1. Viscosity of a fluid depends upon;




... Answer is D. Temperature
--------------------------


2. Drag force exerted by the fluid on a body does not depend upon:




... Answer is D. Volume of fluid
F = 6ㄫηrv


3. A steel ball of radius 'r' is moving with uniform velocity 'v' in the mustard oil, the drag force acting on the ball is 'F'. What would be the drag force on the steel ball of radius 2r moving with uniform velocity 2v in the mustard oil;




... Answer is C. 4F
F = 6ㄫηrv


4. When two spheres of the same volume but different mass fall through a fluid then;




... Answer is D. Heavier body gains its terminal velocity earlier
Heavy objects will have a higher terminal velocity than light objects. Because It takes a larger air resistance force to equal the weight of a heavier object. A larger air resistance force requires more speed


5.  Laminar flow usually occurs at speeds.




... Answer is A. Low
Laminar flow occurs at low speeds


6. In incompressible fluid, which parameter remains constant?




... Answer is D. Density
------------------------------


7. Equation of continuity has been derived on the basis of the law of conservation of :




... Answer is C. Mass
--------------------------


8. According to the equation of continuity A₁v₁ = A₂v₂ = constant. The constant is equal to




... Answer is A. Flow rate
-------------------------


9. When the cross-sectional area of a tube is decreased then the speed of fluid through it is;




... Answer is A. Increased
Av = constant


10. As the water falls its speed increases, and so its cross-sectional area:




... Answer is B. Decreases`
 Equation of continuity Av = constant


11. Bernoulli's equation has been derived on the basis of conservation of;




... Answer is B. Energy
------------------------------


12. What is the speed of water flow through a tap that is connected to a tank that contains water at a height of 2.5 m.




... Answer is C. 7 m s⁻¹
v = `\sqrt {2gh}`


13. A two-metre-high tank is full of water. If a hole appears in its middle, then the speed of efflux is: :




... Answer is A. 4.42 m s⁻¹
v = `\sqrt {2gh}` her h = 1m (half of the tank )


14.  Venturi-meter is an instrument that is being used for the measurement of;




... Answer is B. Velocity of fluid
----------------------------


15. When the velocity of a fluid is increased then its pressure is;




... Answer is B. Decreased
Bernoulli's Principle


16.. Systolic pressure is called;




... Answer is B. High blood pressure
---------------------------



************************************

Shortcut Links For 


1. Website for School and College Level Physics   
2. Website for School and College Level Mathematics  
3. Website for Single National Curriculum Pakistan - All Subjects Notes 

© 2022-Onwards by Academic Skills and Knowledge (ASK)     

Note:  Write to me in the comment box below for any query and also Share this information with your class-fellows and friends.