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Recent questions tagged physics
Questions
In an experiment for determining the gravitational acceleration g of a place with the help of a simple pendulum , The measured time period square is plotted against the string length of the pendulum in the figure ? What is the value of g at the place ?
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
Long range radio transmission is possible when the radio waves are reflected from the ionosphere .For this to happen the frequency of the radiowaves must be in the range :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
Given : A and B are input terminals. \[\] Logic 1 = > 5 V\[\] Logic 0 = < 1 V\[\] Which logic gate operation , the following circuit does ?
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
A piece of wood from a recently cut tree shows 20 decays per minute .A wooden piece of same size placed in a museum (obtained from a tree cut many years back) show 2 decays per minute .If half life of $\;C^{14}\;$ is 5730 years , then age of the wooden piece placed in the museum is approximately :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
1
answer
In a Young's double slit experiment ,the distance between the two identical slits is 6.1 times larger than the slit width.Then the number of intensity maxima observed with in the central maximum of the single slit diffraction pattern is :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
The diameter of the objective lens of microscope makes an angle $\;\beta\;$ at the focus of the microscope . Further, the medium between the object and the lens is an oil of refractive index n . Then the resolving power of the microscope .
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
A ray of light is incident from a denser to a rarer medium . The critical angle for total reflection is $\;\theta_{iC}\;$ and the Brewster's angle of incident is $\;\theta_{iB}\;$, such that $\;\large\frac{sin \theta_{iC}}{sin \theta_{iB}}=\eta= \normalsize 1.28\;$ .The relative refractive index of the two media is :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
1
answer
If denote microwaves , X rays ,infrared ,gamma rays ,ultra - violet , radio waves and visible parts of the electromagnetic spectrum by M ,X,I,G,U,R and V , the following is the arrangement in ascending order of wavelength :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
An example of a perfect diamagnet a superconductor .This implies that when a superconductor is put in a mangetic field of intensity B ,the magnetic field $\;B_{s}\;$ inside the superconductor will be such that :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
1
answer
A square frame of side 10 cm along straight wire carrying current 1 A are in the plane of the paper . Starting from close to the wire , the frame moves towards the right with a constant speed of $\;10\;ms^{-1}\;$ (see figure) .The e.m.f. induced at the time the left arm of the frame is at x=10 cm from the wire is :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
1
answer
Four bulbs $\;B_{1},B_{2},B_{3}\;$ and $\;B_{4}\;$ of 100 W each are connected to 220 V main as shown in the figure .The reading in an ideal ammeter will be :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
1
answer
The gap between the plates of a parallel plate capacitor of area A and distance between plates d , is filled with a dielectric whose permittivity varies linearly from $\;\in_{1}\;$ at one plate to $\;\in_{2}\;$ at the other .The capacitance of capacitor is :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
1
answer
The electric field in a region of space is given by ,$\;\overrightarrow{E}=E_{0} \hat{i}+ 2 E_{0} \hat{j}\;$ where$\;E_{0}=100\;N/C\;$.The flux of this field through a circular surface of radius 0.02 m parallel to the y - z plane is nearly :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
The total length of a sonometer wire between fixed ends is 110 m .Two bridges are placed to divide the length of wire in ratio 6 :3 :2 .The tension in the wire is 400 N and the mass per unit length is 0.01 kg/m . What is the minimum common frequency with which three parts can vibrate ?
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
A body is in simple harmonic motion with time period half second (T=0.5 s) and amplitude one cm (A=1 cm).Find the average velocity in the interval in which it moves from equilibrium position to half of its amplitude .
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
1
answer
A gas molecule of mass M at the surface of the Earth has kinetic energy equivalent at $\;0^{0}C\;$.If it were to go up straight without colliding with any other molecules , how height it would rise ? Assume that the height attained is much less than radius of the earth .($\;k_{B}\;$ is Boltzmann constant)
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
A gas is compressed from a volume of $\;2\;m^{3}\;$ to a volume of $\;1\;m^{3}\;$ at a constant pressure of $\;100\;N/m^{2}\;$.Then it is heated at constant volume by supplying 150 J of energy . As a result , the internal energy of the gas is :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
A block coloured solid sphere of radius R and mass M is inside a cavity with vacuum inside .The walls of the cavity are maintained at temperature $\;T_{0}\;$ . The initial temperature of the sphere is $\;3T_{0}\;$.If the specific heat of the material of the sphere varies is $\;\alpha T^{3}\;$ per unit mass with the temperature T of the sphere , where $\;\alpha\;$ is a constant , then the time taken for the sphere to cool down to temperature $\;2T_{0}\;$ will be ($\;\sigma\; is stefan Boltzmann constant$
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
1
answer
A large number of liquid drops each of radius r coalesce to from a single drop radius R.The energy released in the process is converted into kinetic energy of the big drop so formed . The speed of the big drop is (given surface tension of liquid T , density $\;\rho\;$)
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
In the diagram shown , the difference in the two tubes of the manometer is 5 cm ,the cross section of the tube at A and B is $\;6\;mm^{2}\;$ and $\;10\;mm^{2}\;$ respectively . The rate at which water flows through the tube is $\;(g=10\;ms^{-2})\;$
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
1
answer
The velocity of water in a river is 18 km/hr near the surface . If the river is 5 m deep , find the shearing stress between the horizontal layers of water.The co - efficient of viscosity of water = $\;10^{-2}\;$ poise .
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
The gravitational field in a region is given by $\;\overrightarrow{g}=5\;N/kg\;\hat{i}+12\;N/kg\;\hat{j}\;$.The change in the gravitational potential energy of the particle of mass 2 kg when it is taken from the origin to a point (7m ,-3m) is :
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
A ball of mass 160 g is thrown up at an angle of $\;60^{0}\;$ to the horizontal at a speed of $\;10\;ms^{-1}\;$. the angular momentum of the ball at the highest point of the trajectory with respect to the point from which the ball is thrown is nearly $\;(g=10\;ms^{-2})\;$
jeemain
physics
2014
set-10
asked
May 28, 2014
by
yamini.v
0
answers
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