MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
Physics NEET MCQ
Properties Of Matter Mcq
Quiz 7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
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]
0%
a) 2 cm/s
0%
b) 4 cm/s
0%
c) 6 cm/s
0%
d) 8 cm/s
Explanation
From Formula for terminal velocity Answer: (d)
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
0%
a)16P/3
0%
b) 4P/3
0%
c)P
0%
d)3P/16
Explanation
According to Poiseulli's formula the volume of liquid flowing through a capillary tube in one second is given by since volume flowing through the two tube is same Answer: (a)
Q.3
The flow of fluid is laminar or streamline is determined by [ PET 1988]
0%
a) Rate of flow of fluid
0%
b) Density of fluid
0%
c)Radius of tube
0%
d)Coefficient of viscosity of liquid
Explanation
Answer: (a)
Q.4
Which of the following curves represent the velocity of spherical body falling through a viscous medium
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
When t=0, acceleration is maximum and velocity is zero. As velocity starts to increase viscous, buoyant force acts upward such that resultant force on the object is zero. body attends constant velocity Answer:(d)
Q.5
Reynold's number is low for [ PET 1992]
0%
a) low velocity
0%
b) low density
0%
c) high viscosity
0%
d) All of the above
Explanation
Answer: (d)
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.
0%
a) F
0%
b) 4F
0%
c)6F
0%
d)9F
Explanation
we know that Y= As cross sectional area of 2nd wire is 3 times therefore 9F force is required for same elongation.Answer: (d)
Q.7
A beam of metal supported at the two ends is loaded at the centre. The depression at the centre ispropotional to..............
0%
a) Y2
0%
b) Y
0%
c)1/Y
0%
d)1/Y3
Explanation
Depression in beam.Answer: (c)
Q.8
The young's modulus of the material of a wire is equal to the ...........
0%
a) stress required to increase its length four times
0%
b) stress required to produce unit strain
0%
c)strain produced in it
0%
d)stress acting on it
Explanation
Answer:(b)
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]
0%
a) bend with iron on the outer side
0%
b) bend with copper on the outer side
0%
c) remain in a straight condition
0%
d) be twisted to a helix
Explanation
Answer:(b)
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............
0%
a) 20 m/s
0%
b) 100 m/s
0%
c) 200 m/s
0%
d) 250 m/s
Explanation
Potential energy stored in the rubber cord catapult will be covered into kinetic energy of mass Answer: (d)
Q.11
When a fluid is in stream line flow, then the reason of viscous force acting between its two layers is
0%
a)Transport of Energy from one layer to another
0%
b) Transport of linear momentum form one layer to another
0%
c)same velocity of molecules
0%
d)The variable density along the length of the tube
Explanation
Answer: (b)
Q.12
maximum possibility of turbulent flow is in a fluid of
0%
a) low density and low viscosity
0%
b) high densit and high viscosity
0%
c)low density and high viscosity
0%
d)high density and low viscosity
Explanation
According to formula for Reynold number K=Reynold numberr=radius of tube η=Coefficient of viscosity ρ=Density of fluidIf K is between 0 to 2000 flow id Laminar If K is between 2000 to 3000 flow is unstable If K is above 3000 flow is turbulent Answer: (d)
Q.13
In a stream lined flow which of the following statements is correct?
0%
a) The speed of flow at all points in space is necessarily same
0%
b) The speed of every particle at one point is same but is different at different points in place
0%
c)The velocity of every particle at a particular point is same
0%
d)The velocity of different particles at the same point in space is different
Explanation
Answer:(c)
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
0%
a) H=h1 + h2
0%
b) H=h1 - h2
0%
c) H=h1 h2
0%
d) H=h1 / h2
Explanation
Let X be the distance where water strikes the ground for Hole O1 for Hole O2 From above two equations (H-h1)h1=(H-h2)h2Thus H=h1 + h2 Answer: (a)
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
0%
a)
0%
b)
0%
c)
0%
d)Can not be calculated
Explanation
We know that rate of flow depends on height , and height is reducing with time Let the level falls by an amount of dh in time dt,velocity of liquid coming out is √(2gh) then then Answer: (a)
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/
0%
a) The ball continues moving along the horizontal path
0%
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
Explanation
Answer: (b)
Q.17
Viscosity in fluid motion is analogues to
0%
a) friction in the motion of solids
0%
b) random motion of the gas molecules
0%
c)non uniform motion of solids
0%
d)internal motion
Explanation
Answer:(a)
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?
0%
a) The law of conservation of energy is violated
0%
b) There is a increase in pressure energy
0%
c) The increase of potential and kinetic energy of balloon decreases the temperature of the surrounding air
0%
d) The increase of potential and kinetic energy is at the expense of pressure and thermal energy
Explanation
Answer: (d)
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)
0%
b)
0%
c)
0%
d)
Explanation
Let X be the distance form the tank where water from both the holes meet Form the formula Depth of first hole=H-h therefore Depth of second hole is h By adding above two equations Answer: (a)
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
0%
a) 4 m/sec
0%
b) 1.6×102 m/s
0%
c)1.6×102 cm/sec
0%
d)4 cm/sec
Explanation
height is same for both ends Fluide pressure=Total pressure - Static pressure Fluide pressure=1.28×105 - 1.2×105 Fluide pressure=8×102 Fluide pressure=½ × ρ × v2 8×103=½ × 103v2 v=4 m/sAnswer: (a)
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]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Since ball becomes stationary thenWeight of ball=Upthrust + viscous forceViscus force=weight of ball - upthrustViscus force=Vd1g - Vd2gF=V[d1 - d2]g But V=M/d1 Answer:(b)
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]
0%
a) 0.3 pa-s
0%
b) 300 pa-s
0%
c) 15 pa-s
0%
d) 150 pa-s
Explanation
From the formula for terminal velocity, density of air=0 Answer: (a)
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
0%
d)measure surface tension
Explanation
Answer: (c)
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]
0%
a) 7.0 m
0%
b) 7.5 m
0%
c)5.5 m
0%
d)3.2 m
Explanation
It is free fall till ball reach the upper surface of the glycerineVelocity of ball when it reach upper surface of glycerine v=√(2gh) v=√(2×9.8×1.5) v2=29.4 m/sFrom the formula v2=u2 - 2gh For motion in glycerine u2=29.4 m/s and final velocity v=0 0=29.4 - 2×2.66×h0=29.4 - 5.32 h h=29.4/5.32=5.5 mAnswer: (c)
Q.25
A ping pong ball is floating on the tip of a vertical water jet. It is in .. [ ISM Dhanbad 1994]
0%
a)neutral equilibrium
0%
b) stable equilibrium
0%
c)unstable equilibrium
0%
d)none of these
Explanation
Answer:(c)
Q.26
The working principle of the pressure gauge is based on ..[ CPMT 1999]
0%
a) Bernoulli's theorem
0%
b) Viscosity
0%
c) Surface tension
0%
d) Pressure
Explanation
Answer: (a)
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]
0%
a)K1+K2
0%
b) K1 K2
0%
c)(K1+K2) / K1K2
0%
d)2K1K2 / K1+K2
Explanation
Answer: (d)
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]
0%
a) cm /sec
0%
b) cm2 / sec
0%
c)cm/sec
0%
d)cm2/ sec2
Explanation
Answer: (b)
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]
0%
a) 2 times
0%
b) 4 times
0%
c)8 times
0%
d)1.36 times
Explanation
According to Stefan's law radiation emitted by unit area of the surface in one second is directly proportional to fourth power of absolute temperature E∝T4 Answer:(d)
Q.30
As compared to a person with white skin, another person with dark skin, will experience [ CPMT 1988]
0%
a) less heat and more cold
0%
b) more heat and more cold
0%
c) more heat and less cold
0%
d) less heat and less cold
Explanation
Answer: (b)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page