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PART - 2 CH - 9 Mechanical Properties of Fluids Physics - PART - 2 CH - 9 Mechanical Properties of Fluids

Gujarat Board (GSEB) - STD 11 Science - Physics (GSEB - English Medium). 184 questions in this chapter.

Question types

PART - 2 CH - 9 Mechanical Properties of Fluids question types

184 questions across 8 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

184
Questions
8
Question groups
5
Question types
Sample Questions

PART - 2 CH - 9 Mechanical Properties of Fluids questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
The height $h$ of the liquid column in a capillary tube on Earth is $h$. On the Moon, where the acceleration due to gravity of earth is $1/6.$ This height is :
  • A
    $h/6$
  • ✓
    $6h$
  • C
    $h$
  • D
    zero

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark
If a liquid neither falls nor rise in a capillary tube, then the angle of contact between the liquid and the capillary material will be:
  • A
    $0^{\circ}$
  • B
    $45^{\circ}$
  • ✓
    $90^{\circ}$
  • D
    $120^{\circ} $

Answer: C.

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Q 3M.C.Q (1 Marks)1 Mark
If work W is required to make an air bubble of volume V from a soap solution, then a bubble of volume 2V can be made from the same solution. The value of work done in making it will be:
  • A
    $W$
  • B
    $\sqrt{2} W$
  • ✓
    $4^{1 / 3} W$
  • D
    $2^{1 / 3} W$

Answer: C.

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Q 5M.C.Q (1 Marks)1 Mark
Due to which quality is it possible to write on the blackboard with chalk?
  • A
    Cohesive force
  • ✓
    Adhesive force
  • C
    Surface tension
  • D
    Viscosity

Answer: B.

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Q 111 Marks Question1 Mark
If the angle of contact between a liquid and solid (a) is less than $90^{\circ} $ (b) is more than $90^{\circ} $ then would the liquid wet the solid? What will be its surface in a capillarly tube made from the solid? Will it rise in the capillary tube?
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Q 162 Marks Questions2 Marks
Rectangular film of soap solution is 6 cm long and 4 cm wide. To make its size $8 cm \times 5 cm$, how much work would have to be done against surface tension? If surface tension of soap solution is $40 \times 10^{-3} N / m$
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Q 172 Marks Questions2 Marks
Water rises to a height of 10 cm in a capillary tube. If the surface tension of water is $73 \times$ $10^{-3} N / m$ and density is $1 \times 10^3 kg / m ^3$ and $g=9.8 m /$ $s^2$ then find the radius of capillary tube.
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Q 182 Marks Questions2 Marks
Between a flat plate of $100 sq . cm$ area a bigger plate is a layer of 1 mm thick glycerine. If the coefficient of viscosity of glycerine is $1.0 kg / m$ sec then how much force is required to move the plate with a velocity of $7 cm / sec$ ?
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Q 192 Marks Questions2 Marks
Water flows in a horizontal pipe one end of which is closed by a value and the reading in the pressure meter on the pipe is $3.5 \times 10^5$ Newton $/ m ^2$.
When the value on the pipe is opened the reading on the pressure meter becomes $3.0 \times 10^5 Newton / m ^2$. Calculate the velocity of water flowing in the pipe.
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Q 202 Marks Questions2 Marks
2 cm from a horizontal pipe of unequal bore. At a point of pressure equal to Hg column, water is flowing out at a velocity of $40 cm / sec$. Calculate the pressure at the point where the velocity of water flow is $60 cm / sec$.
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Q 213 Marks Question3 Marks
The pressure excess inside a soap bubble is equal to 0.8 cm column of water. Radius of bubble is 0.35 cm . Find the surface tension of soap solution.
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Q 223 Marks Question3 Marks
Two soap bubbles have radii 2 cm and 3 cm respectively. What would be the radius of curvature of the surface formed at the contact surface when the two bubbles are brought near each other?
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Q 233 Marks Question3 Marks
A liquid is kept in a cylindrical container which is being rotated around its axis. The support of the walls will rise higher. If the radius of the container is 0.05 m and speed of rotation is 2 revolutions per second then find the difference in height of the container between the center and the side of the container.
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Q 243 Marks Question3 Marks
A tank is filled with water up to a height of H meter and there is a hole in it at a height from the bottom. Find the volume of water coming out of that hole and how far from the tank will it fall on the ground?
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Q 253 Marks Question3 Marks
Two horizontal pipes of radius 1 cm and 2 cm are joined to each other. The velocity of water in first pipe is $8 m / sec$ and pressure is $1 \times 10^5 N / m ^2$. Calculate the velocity and pressure of water in second pipe.
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Q 305 Marks Questions5 Marks
Establish an expression for excess pressure inside a liquid and drop.
or
Find the equation of pressure difference between the two surfaces of a spherical drop. What is the difference between this and soap bubbles?
or
The pressure excess inside a liquid drop is $P =$ $\frac{2 T}{r}$ and for a soap bubble the pressure excess is $P=\frac{4 T}{r}$, Prove it.
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Q 31True False[1 Marks ]1 Mark
Water is flowing in a horizontal pipe of un equal area of cross-section. At a narrow place in the pipe the velocity will be higher and the pressure will he lower.
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Q 36Match the following.5 Marks
AB
1. The direction of viscous force is the direction of liquid flow.(A) Changed
2. Viscosity coefficient also changes when the pressure of a fluid changes.(B) $6 \pi \eta v_t r$
3. The value of the viscous force F =(C) Constant (for the unit volume)
4. Flow of liquid is stream- line then(D) Opposite
5. $\frac{ P }{\rho}+\frac{1}{2} V^2+g h=$(E) R = 2000
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Q 37Match the following.5 Marks
AB
1. Weight of liquid column(A) at density
2. 1 bar(B) dv/dx
3. Different liquids have pressure at the________ ratio of it same depths(C) Pascal
4. On which rule is the working principle of hydraulic lift based?(D) $10^5$ Pascal $( Pa )$
5. Velocity gradient =(E) Ahpg
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