Q.1
A metal ball of radius 2 mm and density 10.5 g/cm3 is dropped in glycerine of coefficient of viscosity 9.8 poise and density 1.5 gm/cmThe terminal velocity of the ball is [ PET 1989]
  • a) 2 cm/s
  • b) 4 cm/s
  • c) 6 cm/s
  • d) 8 cm/s
Q.2
A tube of length L and radius R is joined to another tube of length L/3 and radius R/A fluid is flowing through this tube is P, then the pressure difference across the second tube is
  • a)16P/3
  • b) 4P/3
  • c)P
  • d)3P/16
Q.3
The flow of fluid is laminar or streamline is determined by [ PET 1988]
  • a) Rate of flow of fluid
  • b) Density of fluid
  • c)Radius of tube
  • d)Coefficient of viscosity of liquid
Q.4
Which of the following curves represent the velocity of spherical body falling through a viscous medium
  • a)
    ch-8_qn-183choice_img_no1.png
  • b)
    ch-8_qn-183choice_img_no2.png
  • c)
    ch-8_qn-183choice_img_no3.png
  • d)
    ch-8_qn-183choice_img_no4.png
Q.5
Reynold's number is low for [ PET 1992]
  • a) low velocity
  • b) low density
  • c) high viscosity
  • d) All of the above
Q.6
Two wires are made of the same material and have the same volume. However, wire 1 has cross-sectional area A and wire 2 has cross-sectional Area 3A. If the length of wire 1 increases by on applying force F. How much force is needed to stretch wire 2 by same amount.
  • a) F
  • b) 4F
  • c)6F
  • d)9F
Q.7
A beam of metal supported at the two ends is loaded at the centre. The depression at the centre ispropotional to..............
  • a) Y2
  • b) Y
  • c)1/Y
  • d)1/Y3
Q.8
The young's modulus of the material of a wire is equal to the ...........
  • a) stress required to increase its length four times
  • b) stress required to produce unit strain
  • c)strain produced in it
  • d)stress acting on it
Q.9
A straight bimetallic strip is made of copper ( coefficient of linear expansion 1.62×10-6 K-1) and iron ( coefficient of linear expansion 1.2×10-6 K-1) If this strip is heated to a high temperature, it will [ SCRA 1994]
  • a) bend with iron on the outer side
  • b) bend with copper on the outer side
  • c) remain in a straight condition
  • d) be twisted to a helix
Q.10
A rubber cord catapult has cross-sectional area 25 mm2 and initial length of cord is 10 cm. It isstretched to 5 cm and then released to project a missile of mass 5 gm. Taking Yrubber=5×108 N/m2 velocity of projected missile is............
  • a) 20 m/s
  • b) 100 m/s
  • c) 200 m/s
  • d) 250 m/s
Q.11
When a fluid is in stream line flow, then the reason of viscous force acting between its two layers is
  • a)Transport of Energy from one layer to another
  • b) Transport of linear momentum form one layer to another
  • c)same velocity of molecules
  • d)The variable density along the length of the tube
Q.12
maximum possibility of turbulent flow is in a fluid of
  • a) low density and low viscosity
  • b) high densit and high viscosity
  • c)low density and high viscosity
  • d)high density and low viscosity
Q.13
In a stream lined flow which of the following statements is correct?
  • a) The speed of flow at all points in space is necessarily same
  • b) The speed of every particle at one point is same but is different at different points in place
  • c)The velocity of every particle at a particular point is same
  • d)The velocity of different particles at the same point in space is different
Q.14
There are two holes O1 and O2 in a tank of heigh H. The water emerging from O1 and O2 strikes the ground at the same points, as shown in figure. Then
ch-8_que_no-192_img_no1.png
  • a) H=h1 + h2
  • b) H=h1 - h2
  • c) H=h1 h2
  • d) H=h1 / h2
Q.15
A tank of cross-section A contains a liquid of density upto height H. There is a hole, of cross-section area a, at the bottom of the tank. the time in which the liquid level is reduced to half is
  • a)
    ch-8_qn-193choice_img_no1.png
  • b)
    ch-8_qn-193choice_img_no2.png
  • c)
    ch-8_qn-193choice_img_no3.png
  • d)Can not be calculated
Q.16
A ball is given two motions (i) horizontal motion of translation from left to right and (ii) a rotation in anticlockwise direction about a streamlined flow. Which of the following statements is correct/
  • a) The ball continues moving along the horizontal path
  • b) The ball is deflected downwards from horizontal
  • c)The ball may be deflected upwards from horizontal
  • d)The ball may be deflected upwards or downwards depending upon the horizontal speed of the ball
Q.17
Viscosity in fluid motion is analogues to
  • a) friction in the motion of solids
  • b) random motion of the gas molecules
  • c)non uniform motion of solids
  • d)internal motion
Q.18
A balloon rises against gravity increasing its potential energy. The speed of the balloon also increases as it rises. Which of the following statement is correct?
  • a) The law of conservation of energy is violated
  • b) There is a increase in pressure energy
  • c) The increase of potential and kinetic energy of balloon decreases the temperature of the surrounding air
  • d) The increase of potential and kinetic energy is at the expense of pressure and thermal energy
Q.19
A tank is filled with water upto a height H. Two holes are made on its side wall one at a height h from the bottom and the other at a depth h from the top. The horizontal jet starting from the two holes meet the ground outside at the same point
  • a)
    ch-8_qn-197choice_img_no1.png
  • b)
    ch-8_qn-197choice_img_no2.png
  • c)
    ch-8_qn-197choice_img_no3.png
  • d)
    ch-8_qn-197choice_img_no4.png
Q.20
Water is flowing through a horizontal tube, the static pressure and total pressure at any point are 1.2×105 pascal and 1.28×105 pascal. If the density of water is 1000 kg/m3 then its velocity of flow is
  • a) 4 m/sec
  • b) 1.6×102 m/s
  • c)1.6×102 cm/sec
  • d)4 cm/sec
Q.21
The velocity of small ball of mass M and density d1 when dropped in a container filled with glycerine becomes constant after sometime. If the density of glycerine is d2 , the viscous force acting on glycerine is [ MNR 1993]
  • a)
    ch-8_qn-199choice_img_no1.png
  • b)
    ch-8_qn-199choice_img_no2.png
  • c)
    ch-8_qn-199choice_img_no3.png
  • d)
    ch-8_qn-199choice_img_no4.png
Q.22
An air bubble of radius 1 mm moves up with uniform velocity of 0.109 m/s in a liquid column of density 14.7×103 kg/mIf g=10 m/s2, then coefficient of viscosity will be [ Raj. PET 1997]
  • a) 0.3 pa-s
  • b) 300 pa-s
  • c) 15 pa-s
  • d) 150 pa-s
Q.23
Ventury meter is used to [ Raj.PET 1997]
  • a)measure liquid pressure
  • b) measure density
  • c)measure rate of flow of liquids
  • d)measure surface tension
Q.24
A small steel ball is dropped from height of 1.5 m into a glycerine jar 1.5 sec after it was dropped. the height of the glycerine in the jar. If the retardation is 2.66 m/sec2, is about [ AMU 1995]
  • a) 7.0 m
  • b) 7.5 m
  • c)5.5 m
  • d)3.2 m
Q.25
A ping pong ball is floating on the tip of a vertical water jet. It is in .. [ ISM Dhanbad 1994]
  • a)neutral equilibrium
  • b) stable equilibrium
  • c)unstable equilibrium
  • d)none of these
Q.26
The working principle of the pressure gauge is based on ..[ CPMT 1999]
  • a) Bernoulli's theorem
  • b) Viscosity
  • c) Surface tension
  • d) Pressure
Q.27
A slab consists of two series layers of two different materials of same thickness and have thermal conductivities K1 and KThe equivalent thermal conductivity of the slab is [ MPPMT 1991]
  • a)K1+K2
  • b) K1 K2
  • c)(K1+K2) / K1K2
  • d)2K1K2 / K1+K2
Q.28
If K denotes coefficient of thermal conductivity, d the density and C the specific heat, the unit of X, where X=K/dC will be [ Pant Nagar 1987]
  • a) cm /sec
  • b) cm2 / sec
  • c)cm/sec
  • d)cm2/ sec2
Q.29
The temperature of a piece of metal is raised from 27°C to 51.2°C. The rate at which the metal radiates energy increases nearly [ MNR 1987]
  • a) 2 times
  • b) 4 times
  • c)8 times
  • d)1.36 times
Q.30
As compared to a person with white skin, another person with dark skin, will experience [ CPMT 1988]
  • a) less heat and more cold
  • b) more heat and more cold
  • c) more heat and less cold
  • d) less heat and less cold
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