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]
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0%
a) 2 cm/s
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0%
b) 4 cm/s
-
100%
c) 6 cm/s
-
0%
d) 8 cm/s
Explanation
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
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0%
a)16P/3
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0%
b) 4P/3
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0%
c)P
-
100%
d)3P/16
Explanation
Q.3.
The flow of fluid is laminar or streamline is determined by [ PET 1988]
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0%
a) Rate of flow of fluid
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100%
b) Density of fluid
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0%
c)Radius of tube
-
0%
d)Coefficient of viscosity of liquid
Q.4.
Which of the following curves represent the velocity of spherical body falling through a viscous medium
-
100%
a)
-
0%
b)
-
0%
c)
-
0%
d)
Q.5.
Reynold's number is low for [ PET 1992]
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0%
a) low velocity
-
100%
b) low density
-
0%
c) high viscosity
-
0%
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.
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0%
a) F
-
0%
b) 4F
-
100%
c)6F
-
0%
d)9F
Explanation
Q.7.
A beam of metal supported at the two ends is loaded at the centre. The depression at the centre ispropotional to..............
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0%
a) Y2
-
0%
b) Y
-
0%
c)1/Y
-
100%
d)1/Y3
Explanation
Q.8.
The young's modulus of the material of a wire is equal to the ...........
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0%
a) stress required to increase its length four times
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0%
b) stress required to produce unit strain
-
100%
c)strain produced in it
-
0%
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]
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0%
a) bend with iron on the outer side
-
0%
b) bend with copper on the outer side
-
100%
c) remain in a straight condition
-
0%
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............
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0%
a) 20 m/s
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0%
b) 100 m/s
-
100%
c) 200 m/s
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0%
d) 250 m/s
Explanation
Q.11.
When a fluid is in stream line flow, then the reason of viscous force acting between its two layers is
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0%
a)Transport of Energy from one layer to another
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0%
b) Transport of linear momentum form one layer to another
-
0%
c)same velocity of molecules
-
100%
d)The variable density along the length of the tube
Q.12.
maximum possibility of turbulent flow is in a fluid of
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0%
a) low density and low viscosity
-
0%
b) high densit and high viscosity
-
0%
c)low density and high viscosity
-
100%
d)high density and low viscosity
Explanation
Q.13.
In a stream lined flow which of the following statements is correct?
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0%
a) The speed of flow at all points in space is necessarily same
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0%
b) The speed of every particle at one point is same but is different at different points in place
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0%
c)The velocity of every particle at a particular point is same
-
100%
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
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0%
a) H=h1 + h2
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100%
b) H=h1 - h2
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0%
c) H=h1 h2
-
0%
d) H=h1 / h2
Explanation
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
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0%
a)
-
100%
b)
-
0%
c)
-
0%
d)Can not be calculated
Explanation
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/
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0%
a) The ball continues moving along the horizontal path
-
100%
b) The ball is deflected downwards from horizontal
-
0%
c)The ball may be deflected upwards from horizontal
-
0%
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
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0%
a) friction in the motion of solids
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0%
b) random motion of the gas molecules
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0%
c)non uniform motion of solids
-
100%
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?
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0%
a) The law of conservation of energy is violated
-
0%
b) There is a increase in pressure energy
-
100%
c) The increase of potential and kinetic energy of balloon decreases the temperature of the surrounding air
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0%
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
-
0%
a)
-
100%
b)
-
0%
c)
-
0%
d)
Explanation
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
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0%
a) 4 m/sec
-
0%
b) 1.6×102 m/s
-
100%
c)1.6×102 cm/sec
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0%
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]
-
100%
a)
-
0%
b)
-
0%
c)
-
0%
d)
Explanation
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]
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0%
a) 0.3 pa-s
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0%
b) 300 pa-s
-
100%
c) 15 pa-s
-
0%
d) 150 pa-s
Explanation
Q.23.
Ventury meter is used to [ Raj.PET 1997]
-
0%
a)measure liquid pressure
-
0%
b) measure density
-
0%
c)measure rate of flow of liquids
-
100%
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]
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0%
a) 7.0 m
-
0%
b) 7.5 m
-
100%
c)5.5 m
-
0%
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]
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0%
a)neutral equilibrium
-
0%
b) stable equilibrium
-
0%
c)unstable equilibrium
-
100%
d)none of these
Q.26.
The working principle of the pressure gauge is based on ..[ CPMT 1999]
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0%
a) Bernoulli's theorem
-
0%
b) Viscosity
-
0%
c) Surface tension
-
100%
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]
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0%
a)K1+K2
-
0%
b) K1 K2
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0%
c)(K1+K2) / K1K2
-
100%
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]
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0%
a) cm /sec
-
0%
b) cm2 / sec
-
0%
c)cm/sec
-
100%
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]
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0%
a) 2 times
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0%
b) 4 times
-
0%
c)8 times
-
100%
d)1.36 times
Explanation
Q.30.
As compared to a person with white skin, another person with dark skin, will experience [ CPMT 1988]
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0%
a) less heat and more cold
-
0%
b) more heat and more cold
-
0%
c) more heat and less cold
-
100%
d) less heat and less cold