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Worksheet for Class 11 Physics Chapter 10 Mechanical Properties Of Fluids
Class 11 Physics students should download to the following Chapter 10 Mechanical Properties Of Fluids Class 11 worksheet in PDF. This test paper with questions and answers for Class 11 will be very useful for exams and help you to score good marks
Class 11 Physics Worksheet for Chapter 10 Mechanical Properties Of Fluids
Question- A water tank standing on the floor has two small holes punched in the vertical wall one above the other. The holes are 2.4 cm and 7.6 cm above the floor. If the jest of water from the holes hit the floor at the same point, then the height of water in the tank is :
(a) 10 cm
(b) 5 cm
(c) 20 cm
(d) 48 cm
Ans- (a)
Question- Water is flowing through two horizontal pipes of different diameters whcih are connected together. The diameter of the two pipes are 3 cm and 6 cm respectively. If the speed of water in the narrower tube is 4 m/s. Then, the speed of water in the wider tube is :
(a) 16 m/s
(b) 1 m/s
(c) 4 m/s
(d) 2 m/s
Ans- (b)
Question- The pressure of water in a pipe when tap is closed is 5.5 × 105 N/m2. When tap gets open, pressure reduces to 5 × 105 N/m2. The velocity with which water comes out on opening
the tap is :
(a) 10 m/s
(b) 5 m/s
(c) 20 m/s
(d) 15 m/s
Ans-(a)
Question- The ratio of the terminal velocities of two drops of radii R and R/2 is
(a) 2
(b) 1
(c) 1/2
(d) 4
Ans- (d)
Question- Units of coefficient of viscosity are
(a) Nms–1
(b) Nm2s–1
(c) Nm–2s
(d) None of these
Ans- (c)
Question- A rain drop of radius r falls in air with a terminal speed vt.What is the terminal speed of a rain drop of radius 2r ?
(a) vt/2
(b) vt
(c) 2vt
(d) 4vt
Ans- (d)
Question- Eight spherical rain drops of the same mass and radius are falling down with a terminal speed of 6 cm s–1. If they coalesce to form one big drop, what will be its terminal speed ? Neglect the buoyancy due to air.
(a) 1.5 cms–1
(b) 6 cms–1
(c) 24 cms–1
(d) 32 cms–1
Ans-(c)
Question- As the temperature of water increases, its viscosity
(a) remains unchanged
(b) decreases
(c) increases
(d) increases or decreases depending on the external pressure
Ans- (b)
Question- Two small drops of mercury each of radius r from a single large drop. The ratio of surface energy before and after this change is :
(a) 2 : 22/3
(b) 22/3 : 1
(c) 2 : 1
(d) 1 : 2
Ans- (a)
Question- If the angle of contact is less than 90°, then pressure just inside the surface of a meniscus
(a) is less than atmospheric pressure
(b) is greater than atmospheric pressure
(c) is same as the atmospheric pressure
(d) none of these
Ans- (a)
Question- Which of the following is not the unit of surface tension?
(a) Newton/metre
(b) Joule/(metre)2
(c) kg/(second)2
(d) 3Watt/metre
Ans- (d)
Question- Surface tension is due to
(a) friction forces between molecules
(b) cohesive forces between molecules
(c) adhesive forces between molecules
(d) gravitational forces
Ans- (b)
Question- The water droplets in free fall are spherical due to
(a) gravity
(b) viscosity
(c) surface tension
(d) intermolecular attraction
Ans- (c)
Question- Tiny insects can float and walk on the surface of water due to
(a) buoyancy alone
(b) surface tension alone
(c) both buoyancy and surface tension
(d) neither buoyancy nor surface tension
Ans-(c)
Question- The spiders and insects move and run on the surface of water without sinking, because
(a) elastic membrane is formed on water due to property of surface tension
(b) spiders and insects are lighter
(c) spiders and insects swim on water
(d) spiders and insects experience upthrust
Ans- (a)
Question- Small droplets of liquid are usually more spherical in shape than larger drops of the same liquid because
(a) force of surface tension is equal and opposite to the force of gravity
(b) force of surface tension predominates the force of gravity
(c) force of gravity predominates the force of surface tension
(d) force of gravity and force of surface tension act in the same direction and are equal
Ans- (b)
Question- Hair of shaving brush cling together when it is removed from water due to
(a) force of attraction between hair
(b) surface tension
(c) viscosity of water
(d) characteristic property of hair
Ans- (b)
Question- Water does not wet an oily glass, because
(a) cohesive force of oil > adhesive force between oil and glass
(b) cohesive force of oil > cohesive force of water
(c) oil repels water
(d) cohesive force of water > adhesive force between water and oil molecules
Ans- (d)
Question- Two water droplets coalesce to form a large drop. In this process,
(a) energy is liberated
(b) energy is absorbed
(c) energy is neither liberated nor absorbed
(d) a small amount of mass is converted into energy in accordance with Einstein’s mass-energy equivalence relation E = mc2.
Ans- (a)
Question- A mercury drop of radius 1 cm is sprayed into 106 drops of equal size. The energy expended in joule is (surface tension of mercury is 460 × 10–3 Nm–1)
(a) 0.057
(b) 5.7
(c) 5.7 × 10–4
(d) 5.7 × 10–6
Ans- (a)
Question- If two soaps bubbles of equal radii r coalesce, then the radius of curvature of interface between two bubble will be:
(a) r
(b) 0
(c) infinity
(d) r/2
Ans- (c)
Question- A glass plate is partly dipped vertically in the mercury and angle of contact is measured. If the plate is inclined, then the angle of contact will
(a) increase
(b) remain unchanged
(c) increase or decrease
(d) decrease
Ans- (b)
Question- A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is
(a) flat
(b) concave
(c) convex
(d) cylindrical
Ans-(b)
Question- If two soap bubble of different radii are in communication with each other
(a) air flow from larger bubble into the smaller one
(b) the size of the bubbles remains the same
(c) air flows from the smaller bubble into the large one and the larger bubble grows at the expense of the smaller one
(d) None of the above
Ans-(c)
Question- The excess pressure due to surface tension in a spherical liquid drop of radius r is directly proportional to
(a) r
(b) r2
(c) r–1
(d) r–2
Ans-(c)
Question- The liquid in the capillary tube will rise, if the angle of contact is
(a) 0°
(b) 90°
(c) obtuse
(d) acute
Ans-(a, d)
Question- If a capillary tube is dippped into liquid and the levels of the liquid inside and outside are same, then the angle of contact is :
(a) 0°
(b) 90°
(c) 45°
(d) 30°
Ans-(b)
Question- Water rises to a height of 30 mm in a capilary tube. If the radius of the capillary tube is made 3/4 of its previous value. The height to which the water will rise in the tube is:
(a) 30 mm
(b) 20 mm
(c) 40 mm
(d) 10 mm
Ans-(c)
Question- When two capillary tubes of different diameters are dipped vertically, then rise of the liquid is:
(a) same in both the tubes
(b) more in the tube of larger diameter
(c) less in the tube of smaller diameter
(d) more in the tube of smaller diameter
Ans-(d)
Question- Water rises up to 10 cm height in a long capillary tube. If this tube is immersed in water so that the height above the water surface is only 8 cm, then
(a) water flows out continuously from the upper end
(b) water rises upto upper end and forms a spherical surface
(c) water only rises upto 6 cm height
(d) water does not rise at all
Ans-(b)
Question- Spherical balls of radius R are falling in a viscous fluid of viscosity η with a velocity v. The retarding viscous force acting on the spherical ball is
(a) directly proportional to R but inversely proportional to v.
(b) directly proportional to both radius R and velocity v.
(c) inversely proportional to both radius R and velocity v.
(d) inversely proportional to R but directly proportional to velocity v.
Ans-(b)
Question- If two soap bubbles of different radii are connected by a tube
(a) air flows from the bigger bubble to the smaller bubble till the sizes become equal
(b) air flows from bigger bubble to the smaller bubble till the sizes are interchanged
(c) air flows from the smaller bubble to the bigger
(d) there is no flow of air.
Ans-(c)
Question- A cylinder of height 20 m is completely filled with water.The velocity of efflux of water (in ms–1) through a small hole on the side wall of the cylinder near its bottom, is
(a) 10
(b) 20
(c) 25.5
(d) 5
Ans-(b)
Question- A 20 cm long capillary tube is dipped in water. The water rises upto 8 cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be
(a) 8 cm
(b) 10 cm
(c) 4 cm
(d) 20 cm
Ans-(d)
Question- If the terminal speed of a sphere of gold (density = 19.5 kgm–3) is 0.2 ms–1 in a viscous liquid (density = 1.5 kgm–3), find the terminal speed of a sphere of silver (density = 10.5 kg/m–3) of the same size in the same liquid.
(a) 0.4 ms–1
(b) 0.133 ms–1
(c) 0.1 ms–1
(d) 0.2 ms–1
Ans-(c)
Question- Two mercury drops (each of radius r) merge to form a bigger drop. The surface energy of the bigger drop, if T is the surface tension, is
(a) 25 /3πr2T
(b) 4πr2T
(c) 2πr2T
(d) 28/ 3πr2T
Ans-(d)
Question- Work done in increasing the size of a soap bubble from radius of 3 cm to 5 cm is nearly (surface tension of soap solution = 0.03 Nm–1)
(a) 0.2 π mJ
(b) 2 π mJ
(c) 0.4 π mJ
(d) 4 π mJ
Ans-(c)
Question- An open glass tube is immersed in mercury in such a way that a length of 8 cm extends above the mercury level. The open end of the tube is then closed and sealed and the tube is raised vertically up by additional 46 cm. What will be length of the air column above mercury in the tube now? (Atmospheric pressure - 76 cm of Hg)
(a) 22 cm
(b) 38 cm
(c) 6 cm
(d) 16 cm
Ans-(d)
Question- A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently,the temperature of the system is found to be 750C. T is given by :
(Given : Room temperature = 300C, Specific heat of copper = 0.1 cal/gm0C)
(a) 885°C
(b) 1250°C
(c) 825°C
(d) 800°C
Ans-(a)
Question- Water is flowing at a speed of 1.5 ms–1 through a horizontal tube of cross-sectional area 10–2m2 and you are trying to stop the flow by your palm. Assuming that the water stops immediately after hitting the palm, the minimum force that you must exert should be (density of water = 103 kgm–3).
(a) 15 N
(b) 22.5 N
(c) 33.7 N
(d) 45 N
Ans-(b)
Question- Two soap bubbles coalesce to form a single bubble. If V is the subsequent change in volume of contained air and S the change in total surface area, T is the surface tension and P atmospheric pressure, which of the following relation is correct?
(a) 2PV + 3ST = 0
(b) 3PV + 4ST = 0
(c) 4PV + 3ST = 0
(d) 3PV + 2ST = 0
Ans-(b)
Question- A tank with a small hole at the bottom has been filled with water and kerosene (specific gravity 0.8). The height of water is 3 m and that of kerosene 2 m. When the hole is opened the velocity of fluid coming out from it is nearly:
(take g = 10 ms–2 and density of water = 103 kg m–3)
(a) 8.5 ms–1
(b) 9.6 ms–1
(c) 7.6 ms–1
(d) 10.7 ms–1
Ans-(b)
Question- An air bubble of radius 0.1 cm is in a liquid having surface tension 0.06 N/m and density 103 kg/m3. The pressure inside the bubble is 1100 Nm–2 greater than the atmospheric pressure. At what depth is the bubble below the surface of the liquid? (g = 9.8 ms–2)
(a) 0.15 m
(b) 0.1 m
(c) 0.20 m
(d) 0.25 m
Ans-(b)
Question-The average mass of rain drops is 3.0×10–5 kg and their average terminal velocity is 9 m/s. Calculate the energy transferred by rain to each square metre of the surface at a place which receives 100 cm of rain in a year.
(a) 4.05 ×104 J
(b) 3.5 ×105 J
(c) 9.0 ×104 J
(d) 3.0 ×105 J
Ans-(a)
Question- The velocity of water in a river is 18 km/hr near the surface.If the river is 5m deep, find the shearing stress between the horizontal layers of water. The co-efficient of viscosity of water = 10–2 poise.
(a) 10–4 N/m2
(b) 10–1 N/m2
(c) 10–2 N/m2
(d) 10–3 N/m2
Ans- (c)
Question-A cylindrical block of wood (density = 650 kg m-3), of base area 30 cm2 and height 54 cm, floats in a liquid of density 900 kg m-3. The block is depressed slightly and then released. The time period of the resulting oscillations of the block would be equal to that of a simple pendulum of length (nearly) :
(a) 52 cm
(b) 65 cm
(c) 39 cm
(d) 26 cm
Ans-(a)
Question-A small spherical ball of radius r falls freely under gravity through a distance h before entering a tank of water. If,after entering the water, the velocity of the ball does not change, then h is proportional to
(a) r2
(b) r3
(c) r4
(d) r5
Ans- (c)
Question- When an air bubble of radius r rises from the bottom to the surface of a lake, its radius becomes 5r /4.Taking the atmospheric pressure to be equal to 10 m height of water column, the depth of the lake would approximately be (ignore the surface tension and the effect of temperature):
(a) 11.2 m
(b) 8.7 m
(c) 9.5 m
(d) 10.5 m
Ans- (c)
Question- A small soap bubble of radius 4 cm is trapped inside another bubble of radius 6 cm without any contact. Let P2 be the pressure inside the inner bubble and P0, the pressure outside the outer bubble. Radius of another bubble with pressure difference P2-P0 between its inside and outside would be:
(a) 12 cm
(b) 2.4 cm
(c) 6 cm
(d) 4.8 cm
Ans- (b)
Question-A beaker containing water is placed on the platform of a spring balance. The balance reads 1.5 kg. A stone of mass 0.5 kg and density 500 kg/m3 is immersed in water without touching the walls of the beaker. What will be the balance reading now?
(a) 2 kg
(b) 2.5 kg
(c) 1 kg
(d) 3 kg
Ans- (b)
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Worksheet for CBSE Physics Class 11 Chapter 10 Mechanical Properties Of Fluids
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