MERIT YARD

Class 11th Physics - Mechanical Properties of Fluids - MERIT YARD

Question 1 / 40What is the SI unit of Pressure?

A) Newton

B) Joule

C) Pascal

D) Watt

Question 2 / 40Hydraulic lift works on the principle of:

A) Bernoulli's Principle

B) Pascal's Law

C) Archimedes' Principle

D) Hooke's Law

Question 3 / 40With the increase in temperature, the viscosity of a liquid:

A) Increases

B) Remains same

C) Becomes zero

D) Decreases

Question 4 / 40A force of 100 N is applied on an area of 5 m². Find the pressure.

A) 20 Pa

B) 500 Pa

C) 50 Pa

D) 10 Pa

Question 5 / 40The shape of a raindrop is spherical because of:

A) Viscosity

B) Surface Tension

C) Atmospheric pressure

D) Gravity

Question 6 / 40Bernoulli's theorem is based on the conservation of:

A) Mass

B) Energy

C) Momentum

D) Force

Question 7 / 40What is the pressure at a depth of 10m in water? (Take g = 10 m/s² and density = 1000 kg/m³)

A) 10⁴ Pa

B) 10³ Pa

C) 5 x 10⁴ Pa

D) 10⁵ Pa

Question 8 / 40The SI unit of Coefficient of Viscosity is:

A) N/m

B) Pa/s

C) Joule-sec

D) Poiseuille (Pa-s)

Question 9 / 40For a streamline flow, the Reynolds number (Re) should be:

A) Less than 1000

B) More than 3000

C) Exactly 5000

D) Infinite

Question 10 / 40Excess pressure inside a soap bubble of radius R is:

A) 2S/R

B) 4S/R

C) S/R

D) 8S/R

Question 11 / 40If a sphere of radius 'r' falls in a liquid, its terminal velocity is proportional to:

A) r

B) 1/r

C) 1/r²

D) r²

Question 12 / 40The angle of contact for pure water and clean glass is:

A) 90°

B) 45°

C) 135°

D) 0°

Question 13 / 40A liquid does not wet a solid surface if the angle of contact is:

A) Acute

B) Obtuse

C) Zero

D) 45°

Question 14 / 40In a hydraulic press, force of 10N is applied on 2 cm² piston. Force on 20 cm² piston is:

A) 50 N

B) 100 N

C) 200 N

D) 500 N

Question 15 / 40Torricelli's law is used to calculate:

A) Surface tension

B) Velocity of efflux

C) Viscosity

D) Density

Question 16 / 40Venturimeter works on the principle of:

A) Bernoulli's Principle

B) Pascal's Law

C) Archimedes Principle

D) Stokes' Law

Question 17 / 40When detergent is added to water, its surface tension:

A) Increases

B) Decreases

C) Remains same

D) Becomes zero

Question 18 / 40Dimensions of pressure are:

A) [ML^-1T^-2]

B) [MLT^-2]

C) [ML²T^-2]

D) [M^-1L^-1T^-1]

Question 19 / 40Stokes' Law is applicable to:

A) Large bodies

B) Small spherical bodies

C) Rough surfaces

D) Perfect vacuum

Question 20 / 40The value of 1 bar is:

A) 10³ Pa

B) 10⁴ Pa

C) 10⁵ Pa

D) 10⁶ Pa

Question 21 / 40Relative density has:

A) Unit kg/m³

B) Unit g/cm³

C) Unit kg/m

D) No unit

Question 22 / 40Atmospheric pressure is measured by:

A) Manometer

B) Barometer

C) Hydrometer

D) Lactometer

Question 23 / 40At terminal velocity, the net force on the body is:

A) Maximum

B) Weight of body

C) Buoyant force only

D) Zero

Question 24 / 40Magnus effect is seen in:

A) Falling of rain

B) Spinning ball in air

C) Rising of smoke

D) Melting of ice

Question 25 / 40The upward force on an immersed body is called:

A) Friction

B) Viscous force

C) Buoyant force

D) Gravity

Question 26 / 401 atmospheric pressure is about:

A) 76 cm of Hg

B) 10⁵ Pa

C) 1.013 bar

D) All of the above

Question 27 / 40Viscosity is the property of:

A) Solids only

B) Only liquids

C) Both liquids and gases

D) Only ideal fluids

Question 28 / 40Equation of continuity A₁v₁ = A₂v₂ represents conservation of:

A) Mass

B) Energy

C) Momentum

D) Pressure

Question 29 / 40The lift of an airplane is based on:

A) Pascal's Law

B) Archimedes' Principle

C) Bernoulli's Principle

D) Newton's Law

Question 30 / 40Density of a substance is 400 kg/m³. Its relative density is:

A) 400

B) 40

C) 4

D) 0.4

Question 31 / 40Surface tension of liquid is zero at:

A) 0° C

B) 100° C

C) Critical temperature

D) Absolute zero

Question 32 / 40Hydrometer is based on:

A) Pascal's Law

B) Archimedes' Principle

C) Bernoulli's Principle

D) Stokes' Law

Question 33 / 40If pressure increases, the boiling point of water:

A) Increases

B) Decreases

C) Remains same

D) Becomes zero

Question 34 / 40The unit of surface tension is:

A) N-m

B) N/m

C) N/m²

D) Joule-m

Question 35 / 40Blood flow in arteries is generally:

A) Streamline

B) Turbulent

C) Static

D) Unpredictable

Question 36 / 40Energy per unit volume is the same as:

A) Force

B) Pressure

C) Work

D) Density

Question 37 / 40The meniscus of mercury in a glass tube is:

A) Concave

B) Convex

C) Flat

D) Zigzag

Question 38 / 40Which of the following has the highest viscosity?

A) Water

B) Alcohol

C) Glycerine

D) Petrol

Question 39 / 40A bubble has 0.1 mm radius. Surface tension is 0.05 N/m. Excess pressure is:

A) 500 Pa

B) 1000 Pa

C) 1500 Pa

D) 2000 Pa

Question 40 / 40Archimedes principle is used in:

A) Lactometers

B) Submarines

C) Designing ships

D) All of the above

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