MECHANICAL PROPERTIES OF FLUIDS - Pyqs

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Q1
A cube of side \(a\) is subjected to a uniform hydraulic pressure \(p\). If the bulk modulus of the material is \(K\), the decrease in volume of the cube is
(Exam: IIT-JEE Year: 1998)
(A) \(\dfrac{p a^3}{K}\)
(B) \(\dfrac{3 p a^3}{K}\)
(C) \(\dfrac{p a}{K}\)
(D) \(\dfrac{K a^3}{p}\)
Q2
When pressure on a liquid is increased, its density
(Exam: NEET (AIPMT) Year: 2003)
(A) decreases
(B) remains unchanged
(C) increases
(D) becomes zero
Q3
The SI unit of bulk modulus is the same as that of
(Exam: JEE Main Year: 2014)
(A) strain
(B) stress
(C) density
(D) surface tension
Q4
Water is slightly compressible because
(Exam: AIIMS Year: 2007)
(A) its bulk modulus is zero
(B) its bulk modulus is very small
(C) its bulk modulus is very large
(D) it has viscosity
Q5
The reciprocal of bulk modulus is called
(Exam: BITSAT Year: 2009)
(A) elasticity
(B) compressibility
(C) rigidity
(D) plasticity
Q6
If pressure applied on a liquid is doubled, the fractional decrease in volume will
(Exam: JEE Advanced Year: 2016)
(A) become half
(B) remain same
(C) become double
(D) become zero
Q7
Which of the following has maximum bulk modulus?
(Exam: IIT-JEE Year: 2001)
(A) Air
(B) Water
(C) Mercury
(D) Steel
Q8
A liquid is said to be incompressible if its bulk modulus is
(Exam: State Engg. Exam Year: 2010)
(A) zero
(B) finite
(C) negative
(D) infinite
Q9
Bulk modulus depends mainly on
(Exam: NEET Year: 2018)
(A) shape of container
(B) mass of liquid
(C) nature of material
(D) acceleration due to gravity
Q10
The dimensional formula of bulk modulus is
(Exam: IIT-JEE Year: 1995)
(A) \([M L^{-1} T^{-2}]\)
(B) \([M L T^{-2}]\)
(C) \([M L^{-2} T^{-2}]\)
(D) \([M^0 L^0 T^0]\)
Q11
A decrease in volume of a body under uniform pressure is called
(Exam: Olympiad Year: 2008)
(A) shear strain
(B) longitudinal strain
(C) volume strain
(D) linear strain
Q12
If \(K_1 > K_2\), then
(Exam: JEE Main Year: 2017)
(A) material 1 is more compressible
(B) material 2 is more compressible
(C) both equally compressible
(D) compressibility is zero
Q13
For an ideal liquid, the bulk modulus is assumed to be
(Exam: IIT-JEE Year: 1999)
(A) zero
(B) finite
(C) infinite
(D) negative
Q14
When a liquid is subjected to pressure, its volume decreases but its shape
(Exam: NEET Year: 2020)
(A) changes
(B) remains same
(C) becomes spherical
(D) becomes irregular
Q15
The ratio of change in pressure to fractional change in volume is
(Exam: BITSAT Year: 2012)
(A) Young’s modulus
(B) bulk modulus
(C) shear modulus
(D) Poisson’s ratio
Q16
Bulk modulus is applicable to
(Exam: IIT-JEE Year: 2004)
(A) solids only
(B) liquids only
(C) gases only
(D) solids, liquids and gases
Q17
A gas has low bulk modulus because
(Exam: NEET Year: 2015)
(A) molecules are closely packed
(B) intermolecular space is large
(C) density is high
(D) viscosity is low
Q18
If pressure on a liquid is increased by \(\Delta p\), the volume strain produced is
(Exam: JEE Advanced Year: 2019)
(A) \(K \Delta p\)
(B) \(\dfrac{\Delta p}{K}\)
(C) \(\dfrac{K}{\Delta p}\)
(D) zero
Q19
Which is most compressible?
(Exam: AIIMS Year: 2006)
(A) Solid
(B) Liquid
(C) Gas
(D) Plasma
Q20
The bulk modulus of water is about
(Exam: IIT-JEE Year: 2002)
(A) \(2 \times 10^3 \,\text{Pa}\)
(B) \(2 \times 10^6 \,\text{Pa}\)
(C) \(2 \times 10^9 \,\text{Pa}\)
(D) \(2 \times 10^{12} \,\text{Pa}\)
Q21
Under hydraulic pressure, stress produced in a liquid is
(Exam: State Engg. Exam Year: 2011)
(A) tensile
(B) shear
(C) compressive
(D) tangential
Q22
Which elastic constant relates pressure with volume strain?
(Exam: JEE Main Year: 2016)
(A) Young’s modulus
(B) shear modulus
(C) bulk modulus
(D) rigidity modulus
Q23
If the bulk modulus of a substance is zero, it behaves like
(Exam: Olympiad Year: 2010)
(A) an ideal solid
(B) an incompressible liquid
(C) a perfectly compressible medium
(D) vacuum
Q24
Bulk modulus is independent of
(Exam: NEET Year: 2019)
(A) pressure applied (within limits)
(B) temperature (approximately)
(C) shape of the body
(D) nature of material
Q25
A given volume of liquid is compressed isothermally. The bulk modulus is defined as
(Exam: IIT-JEE Year: 1997)
(A) \(-pV\)
(B) \(-V \dfrac{dp}{dV}\)
(C) \(-\dfrac{dV}{dp}\)
(D) \(\dfrac{dp}{dV}\)
Q26
Which quantity has the same dimensions as bulk modulus?
(Exam: BITSAT Year: 2013)
(A) Energy density
(B) Strain
(C) Momentum
(D) Angular velocity
Q27
In fluids, elastic behaviour is mainly associated with
(Exam: JEE Advanced Year: 2018)
(A) shear deformation
(B) volume deformation
(C) longitudinal deformation
(D) bending
Q28
The compressibility of a liquid is very small because
(Exam: NEET Year: 2017)
(A) density is low
(B) molecules are rigid
(C) intermolecular spacing is small
(D) viscosity is high
Q29
Bulk modulus is numerically equal to
(Exam: IIT-JEE Year: 2000)
(A) pressure causing unit volume strain
(B) volume causing unit pressure
(C) stress causing unit shear strain
(D) strain causing unit stress
Q30
The bulk modulus of air at STP is of the order of
(Exam: JEE Main Year: 2015)
(A) \(10^2\) Pa
(B) \(10^5\) Pa
(C) \(10^9\) Pa
(D) \(10^{12}\) Pa
Q31
Which of the following does not affect bulk modulus?
(Exam: State Engg. Exam Year: 2012)
(A) Nature of material
(B) Pressure range
(C) Temperature
(D) Shape of body
Q32
A liquid under high pressure stores energy in the form of
(Exam: Olympiad Year: 2011)
(A) kinetic energy
(B) elastic potential energy
(C) thermal energy
(D) surface energy
Q33
Bulk modulus is a measure of
(Exam: NEET Year: 2014)
(A) rigidity
(B) hardness
(C) resistance to compression
(D) resistance to shear
Q34
If the pressure on a liquid is reduced, its volume
(Exam: IIT-JEE Year: 1996)
(A) decreases
(B) remains same
(C) increases
(D) becomes zero
Q35
In fluids, the restoring force against deformation arises due to
(Exam: JEE Advanced Year: 2020)
(A) shear stress
(B) tensile stress
(C) compressive stress
(D) friction
Q36
The inverse of compressibility represents
(Exam: BITSAT Year: 2011)
(A) density
(B) elasticity
(C) bulk modulus
(D) pressure
Q37
Which statement is correct?
(Exam: NEET Year: 2016)
(A) Liquids cannot be compressed at all
(B) Liquids are perfectly elastic
(C) Liquids are slightly compressible
(D) Liquids have zero bulk modulus
Q38
A fluid having very high bulk modulus behaves almost like
(Exam: IIT-JEE Year: 2003)
(A) a gas
(B) a solid
(C) a vacuum
(D) plasma
Q39
The bulk modulus of a substance depends on
(Exam: JEE Main Year: 2019)
(A) external shape
(B) internal structure
(C) volume
(D) mass
Q40
For small deformations, bulk modulus remains
(Exam: IIT-JEE Year: 1994)
(A) zero
(B) negative
(C) constant
(D) infinite
Q41
Which elastic property is relevant for fluids at rest?
(Exam: NEET Year: 2021)
(A) Young’s modulus
(B) shear modulus
(C) bulk modulus
(D) torsional modulus
Q42
A given mass of water is compressed. The work done is stored as
(Exam: Olympiad Year: 2012)
(A) kinetic energy
(B) gravitational energy
(C) elastic potential energy
(D) chemical energy
Q43
Bulk modulus is maximum for
(Exam: State Engg. Exam Year: 2013)
(A) rubber
(B) water
(C) steel
(D) air
Q44
If volume strain is zero, the bulk modulus is
(Exam: IIT-JEE Year: 1993)
(A) zero
(B) finite
(C) infinite
(D) negative
Q45
The elastic behaviour of fluids is analogous to
(Exam: JEE Advanced Year: 2015)
(A) shear in solids
(B) stretching of wires
(C) compression of springs
(D) bending of beams
Q46
Which of the following quantities is least for gases?
(Exam: NEET Year: 2013)
(A) Density
(B) Bulk modulus
(C) Volume
(D) Pressure
Q47
A liquid’s resistance to compression is due to
(Exam: IIT-JEE Year: 2005)
(A) viscosity
(B) surface tension
(C) intermolecular forces
(D) gravity
Q48
The bulk modulus of a liquid slightly
(Exam: JEE Main Year: 2018)
(A) decreases with pressure
(B) increases with pressure
(C) becomes zero
(D) is independent of pressure always
Q49
Which is correct regarding bulk modulus?
(Exam: Olympiad Year: 2009)
(A) Scalar quantity
(B) Vector quantity
(C) Dimensionless
(D) Negative
Q50
In hydraulic systems, the concept of bulk modulus is important to understand
(Exam: BITSAT Year: 2014)
(A) flow rate
(B) pressure transmission and compression losses
(C) surface tension
(D) viscosity

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