FLUID-MECHANICS-QUIZ-3

FLUID MECHANICS QUIZ-3

Dear Readers,

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. 

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. 

Q1. The relative velocity of two parallel layers of water is 8 cms^-1. If the perpendicular distance between the layers is 0.1 cm, then velocity gradient will be

•  40 s^-1
•  50 s^-1
•  60 s^-1
•  80 s^-1

Solution

Q2.An inverted bell lying at the bottom of a lake 47.6 m deep has 50 cm³ of air trapped in it. The ball is brought to the surface of the lake. The volume of the trapped air will be (atmospheric pressure =70 cm of Hg and density of Hg=13.6 g/cm³)

•  350 cm³
•  300 cm³
•  250 cm³
•  22 cm³

Solution

Q3.  Eight drops of a density ρ and each of radius a are falling through air with a constant velocity 375cm s^-1. When the eight drops coalesce to from a single drop the terminal velocity of the new drop will be

•  1.5×10^-2 ms^-1
•  2.4×10^-2 ms^-1
•  0.75×10^-2 ms^-1
•  15×10^-2 ms^-1

Solution

Q4. An aeroplane of mass 3×10⁴ kg and total wing area of 120 m² is in a level flight at some height. The difference in pressure between the upper and lower surface of its wings in kilo pascals is (g=10 ms^-2

•  2.5
•  5
•  10.0
•  12.5

Solution

Q5.In which one of the following cases will the liquid flow in a pipe be most streamlined

•  Liquid of high viscosity and high density flowing through a pipe of small radius
•  Liquid of high viscosity and low density flowing through a pipe of small radius
•  Liquid of low viscosity and low density flowing through a pipe of large radius
•  Liquid of low viscosity and high density flowing through a pipe of large radius

Solution
  

Q6. A horizontal pipe of non-uniform cross-section allows water to flow through it with a velocity 1 ms^-1 when pressure is 50 kPa at a point. If the velocity of flow has to be 2 ms^-1 at some other point, the pressure at that point should be

•  50 kPa
•  100 kPa
• 48.5 kPa
•  24.25 kPa

Solution

Q7.The height of a mercury barometer is 75 cm at sea level and 50 cm at the top of a hill. Ratio of density of mercury to that of air is 10⁴. The height of the hill is

•  250 m
•  2.5 m
•  1.25 km
•  750 m

Solution

Q8.In the figure, the velocity V₃ will be

•  Zero
•  4ms^-1
•  1ms^-1
•  3ms^-1

Solution

Q9.With the increase in temperature, the angle of contact

•  Decreases
•  Increases
•  Remains constant
•  Sometimes increases and sometimes decreases

Solution

Q10. An air-tight cage with a parrot sitting in it is suspended from the spring balance. The parrot starts flying. The reading of the spring balance will

•  increases
•  Decreases
•  remain Unchanged
• Zero

Solution