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Recent questions tagged physics
Questions
A cylindrical vessel of cross - section A contains water to a height h.There is a hole in the bottom of radius ' a ' .The time in which it will be emptied is :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
0
answers
Steel ruptures when a shear of $\;3.5 \times 10^{8}\;Nm^{-2}\;$ is applied .The force needed to punch a 1 cm diameter hole in a steel sheet 0.3 cm thick is nearly :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
0
answers
Two hypothetical plates masses $\;m_{1}\;$ and $\;m_{2}\;$ are at rest when they are infinite distance apart .Because of the gravitational force they move towards each other along the line joining their centers .What is their speed when their separation is 'd ' ? (Speed of $\;m_{1}\;$ is $\;v_{1}\;$ and that of $\;m_{2}\;$ is $\;v_{2}\;$)
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
1
answer
A particle is moving in a circular path of radius a , with a constant velocity v as shown in the figure . The center of circle is marked by 'C' .The angular momentum from the origin O can be written as :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
1
answer
A spring of unstretched length l has a mass m with one end fixed to a rigid support .Assuming spring to be made of a uniform wire , the kinetic energy possessed by it if its free end is pulled with uniform velocity v is :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
1
answer
A 4 g bullet is fired horizontally with a speed of 300 m/s into 0.8 kg block of wood at rest on a table .If the coefficient of friction between the block and the table is 0.3 , how far will the block side approximately ?
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
1
answer
Three masses m,2m and 3m are moving in x - y plane with speed 3u,2u and u respectively as shown in figure . The three masses collide at the same point at P and stick together .The velocity of resulting mass will be :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
0
answers
A person climbs up a stalled escalator in 60 s .If standing on the same but escalator running with constant velocity he takes 40 s.How much time is taken by the person to walk up the moving escalator ?
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
0
answers
From the following combinations of physical constants (expressed through their usual symbols) the only combination , that would have the same value in different systems of units , is :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
1
answer
In the experiment of calibration of voltmeter , a standard cell of e.m.f.1.1 volt is balanced against 440 cm of potentiometer wire .The potential difference across the ends of resistance is found to balance against 220 cm of the wire . The corresponding reading of voltmeter is 0.5 volt .The error in the reading of voltmeter will be :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
0
answers
For sky wave propagation , the radio waves must have a frequency range in between :
jeemain
physics
2014
set-06
asked
May 23, 2014
by
yamini.v
0
answers
For LED's to emit light in visible region of electromagnetic light , it should have energy band gap in the range of :
jeemain
physics
2014
set-06
asked
May 22, 2014
by
yamini.v
0
answers
A piece of bone of an animal from a ruin is found to have $\;^{14}C\;$ activity of 12 disintegrations per minute per gm of its carbon content .The $\;^{14}C\;$ activity of a living animal is 16 disintegrations per minute per gm .How long ago nearly did the animal die ? (Given half life of $\;^{14}C\;$ is $\;t_{\large\frac{1}{2}}\;$=5760 years)
jeemain
physics
2014
set-06
asked
May 22, 2014
by
yamini.v
1
answer
A beam of light has two wavelengths $\;4972A^{0}\;$ and $\;6216A^{0}\;$ with a total intensity of $\;3.6 \times 10^{-3} \;Wm^{-2}\;$ equally distributed among the two wavelengths . The beam falls normally on the area of $\;1\;cm^{2}\;$ of a clean metallic surface of work function 2.3 eV.Assume that there is no loss of weight by reflection and that each capable photon ejects one electron .The number of photo electrons liberated in 2s is approximately :
jeemain
physics
2014
set-06
asked
May 22, 2014
by
yamini.v
0
answers
A zener diode is connected to a battery and a load as shown below : The currents $\;I,I_{Z}\;$ and $\;I_{L}\;$ are respectively
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
0
answers
A radioactive nuclei with decay constant 0.5/s is being produced at a constant rate of 100 nuclei/s . If at t=0 there were no nuclei , the time when there are 50 nuclei is :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
0
answers
A photon of wavelength $\;\lambda\;$ is scattered from an electron , which was at rest .The wavelength shift $\;\bigtriangleup \lambda\;$ is three times of $\;\lambda\;$ and the angle of scattering $\;\theta\;$ is $\;60^{0}\;$ . The angle at which the electron recoiled is $\;\phi\;$ .The value of $\;tan \phi\;$ is : (electron speed is much smaller than the speed of light)
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
0
answers
In a compound microscope the focal length of objective lens is 1.2 cm and focal length of eye piece is 3.0 cm .When object is kept at 1.25 cm in front of objective , final image is formed at infinity . Magnifying power of the compound microscope should be :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
1
answer
Two monochromatic light beams of intensity 16 and 9 units are interfacing .The ratio of intensities of bright and dark parts of the resultant pattern is :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
0
answers
An object is located in a fixed position in front of a screen .Sharp image is obtained on the screen for two positions of a thin lens are separated by 10 cm .The size of the images in two situations are in the ratio 3 : 2 . What is the distance between the screen and the object ?
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
1
answer
An electromagnetic field wave of frequency $\;1 \times 10^{14} \;$ hertz is propagating along z - axis . The amplitude of electric field is 4 V/m .If $\;\in_{0}=8.8 \times 10^{-12}\;C^{2}/N-m^{2}\;$ , then average energy density of electric field will be :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
0
answers
A coil of circular cross - section having 1000 turns and $\;4\;cm^{2}\;$ face area is placed with its axis parallel to a magnetic field which decreases by $\;10^{-2}\;Wb\;m^{-2}\;$ in 0.01 s. The e.m.f induced in the coil is :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
0
answers
Three identical bars A,B and C are made of different magnetic materials .When kept in a uniform magnetic field , the field lines around them look as follows : Make the correspondence of these bars with their material being diamagnetic (D) ,ferromagnetic (F) and paramagnetic (P) :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
0
answers
Three straight parallel current carrying conductors are shown in the figure . The force experienced by the middle conductor of length 25 cm is :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
0
answers
In the circuit shown , current (in A) through the 50 V and 30 V batteries are , respectively :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
1
answer
A parallel plate capacitor is made of two plates of length l , width w and separated by distance d . A dielectric slab (dielectric constant K) that fits exactly between the plates is held near the edge of the plates .It is pulled into the capacitor by a force $\;F=-\large\frac{\partial U}{\partial x}\;$ where U is the energy of the capacitor up to distance x (See figure) .If the charge on the capacitor is Q then the force on the dielectric when it is near the edge is :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
1
answer
A cone of base radius R and height h is located in a uniform electric field rightarrow{E}$\;\over\;$ parallel to its base. The electric flux entering the cone is :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
0
answers
Two factories are sounding their sirens at 800 Hz. A man goes from one factory to other at a speed of 2 m/s.The velocity of sound is 320 m/s.The number of beats heard by the person in one second will be :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
0
answers
The angular frequency of the damped oscillator is given by , $\;w=\sqrt{\large\frac{k}{m}-\large\frac{r^{2}}{4m^{2}}}\;$ where k is the spring constant , m is the mass of the oscillator and r is the damping constant.If the ratio $\;\large\frac{r^{2}}{mk}\;$ is $\;8\%\;$ , the change in time period compared to the undamped oscillator is approximately as follows :
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
1
answer
An ideal monoatomic gas is confined in a cylinder by a spring loaded piston of cross section $\;8.0 \times 10^{-3}\;m^{2}\;$.Initially the gas is at 300K and occupies a volume of $\;2.4\times10^{-3}\;m^{3}\;$ and the spring is in its relaxed state as shown in figure.The gas is heated by a small heater until the piston moves out slowly by 0.1 m .The force constant of the spring is 800 N/m and the atmospheric pressure is $\;1.0 \times 10^{5}\;N/m^{2}\;$ . The cylinder and the piston are thermally insulated .The piston and the spring are massless and there is no friction between the piston and the cylinder .The final temperature gas will be : (Neglect the heat loss through the lead wires of the heater.The heat capacity of the heater coil is also negligible)
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
1
answer
During an adiabatic compression , 830 J of work is done on 2 moles of a diatomic ideal gas to reduce its volume by $\;50\%\;$.The change in its temperature is nearly : $\;(R=8.3JK^{-1}mol^{-1})\;$
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
1
answer
A hot body , obeying Newton's law of cooling is cooling down from its peak value $\;80^{0}C\;$to an ambient temperature of $\;30^{0}C\;$ . It takes 5 minutes in cooling down from $\;80^{0}C\;$ to $\;40^{0}C\;$. How much time will it take to cool down from $\;62^{0}C\;$ to $\;32^{0}C\;$ ? (Given ln 2=0.693 ; ln 5=1.609)
jeemain
physics
2014
set-11
asked
May 20, 2014
by
yamini.v
1
answer
An air bubble of radius 0.1 cm is in a liquid having surface tension 0.06 N/m and density $\;10^{3}\;kg/m^{3}\;$ . The pressure inside the bubble is $\;1100\;Nm^{-2}\;$ greater than the atmospheric pressure . At what depth is the bubble below the surface of the liquid ? $\;(g=9.8)\;ms^{-2}\;$
jeemain
physics
2014
set-11
asked
May 19, 2014
by
yamini.v
0
answers
A tank with a small hole at the bottom has been filled with water and kerosene (specific gravity 0.8) . The height of water is 3 m and that of kerosene 2 m . When the hole is opened the velocity of fluid coming out from it is nearly : (take $\;g=10\;ms^{-2}\;$ and density of water =$\;10^{3}\;kg\;m^{-3}\;$)
jeemain
physics
2014
set-11
asked
May 19, 2014
by
yamini.v
0
answers
The bulk moduli of Ethanol , Mercury and water are given as 0.9 ,25 and 2.2 respectively in units of $\;10^{9}\;Nm^{-2}\;$ . For a given value of pressure , the fractional compression in volume is $\;\large\frac{ \bigtriangleup V}{V}\;$. Which of the following statements about $\;\large\frac{\bigtriangleup V}{V}\;$ for these three liquids is correct ?
jeemain
physics
2014
set-11
asked
May 19, 2014
by
yamini.v
0
answers
From a sphere of mass M and radius R , a smaller sphere of radius $\;\large\frac{R}{2}\;$ is carved out such that the cavity made in the original sphere is between its centre and the periphery . (See figure) . For the configuration in the figure where the distance between the centre of the original sphere and the removed sphere is 3R , the gravitational force between the two spheres is :
jeemain
physics
2014
set-11
asked
May 19, 2014
by
yamini.v
0
answers
A thin bar of length L has a mass per unit length $\;\lambda\;$ , that increases linearly with distance from one end .If its total mass is M and its mass per unit length at the lighter end is $\;\lambda_{0}\;$ , then the distance of the centre of mass from the lighter end is :
jeemain
physics
2014
set-11
asked
May 19, 2014
by
yamini.v
1
answer
The average mass of rain drops is $\;3.0 \times 10^{-5}\;$ kg and their average terminal velocity is 9 m/s . Calculate the energy transferred by rain to each square metre of the surface at a place which receives 100 cm of rain in a year .
jeemain
physics
2014
set-11
asked
May 19, 2014
by
yamini.v
0
answers
A small ball of mass m starts at a point A with speed $\;v_{0}\;$ and moves along a frictionless track AB as shown . The track BC has coefficient of friction $\;\mu\;$ . The ball comes to stop at C at travelling a distance L which is :
jeemain
physics
2014
set-11
asked
May 19, 2014
by
yamini.v
1
answer
A body of mass 5 kg under the action of constant force $\;\overrightarrow{F}=F_{x} \hat{i} + F_{y} \hat{j}\;$ has velocity at t=0s as $\;\overrightarrow{v}=(6 \hat{i} -2 \hat{j})\;m/s\;$ and at t=10s as $\;\overrightarrow{v}=+6\hat{j}\; m/s\;$ . The force $\;\overrightarrow{F}\;$ is :
jeemain
physics
2014
set-11
asked
May 19, 2014
by
yamini.v
0
answers
The initial speed of a bullet fired from a rifle is 630 m/s . The rifle is fired at the centre of a target 700 m away at the same level as the target . How far above the centre of the target the rifle must me aimed in order to hit the target ?
jeemain
physics
2014
set-11
asked
May 19, 2014
by
yamini.v
0
answers
In terms of resistance R and time T , the dimensions of ratio $\;\large\frac{\mu}{\in}\;$ of the permeability $\;\mu\;$ and permittivity $\;\in\;$ is :
jeemain
physics
2014
set-11
asked
May 19, 2014
by
yamini.v
0
answers
Given the two statements below, which of the following responses that follow the statements is correct?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
degrees-of-freedom
easy
kinetic-energy-of-molecules
asked
May 12, 2014
by
sreemathi.v
1
answer
Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Internal energy of a gas must increase when temperature is increased}\\\text{Reason:Internal energy is a function of velocity of gas.}\end{array}$
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:A substance existing in the gaseous state at a temperature below its critical temperature is called a vapour and can be liquified by the application of pressure done.Above the critical temperature liquefaction is not possible by compression of gas and it is called a gas}\\\text{Reason:A triple point is the pressure and temperature point for a substance where all its 3 states coexist.}\end{array}$
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:The ratio }\large\frac{C_P}{C_V}\normalsize \text{ is more for helium than hydrogen.}\\\text{Reason:Atomic mass of helium is more than hydrogen.}\end{array}$
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
A tube sealed at both ends is 100cm long.It lies horizontally,the middle 0.1m containing mercury & 2 ends containing air at standard atmospheric pressure.If tube is turned to vertical position,what amount of mercury will be displaced?
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
An insulated container containing monoatomic gas of molar mass $m$ is moving with velocity $v_0$.If the container is suddenly stopped,find the change in temperature.
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
A box of $1m^3$ is filled with nitrogen at 1.5atm at 300K.The box has a hole of area $0.01mm^2$.How much time is required for pressure to reduce by 0.1atm.If pressure outside is 1atm
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
An air bubble is released from the bottom of a lake of depth 11m.The temperature at the bottom is $4^{\large\circ}C$ and that at the surface is $12^{\large\circ}C$.What is the ratio of bubble's radius at the surface and its radius at bottom?Assume density of heater is $100Kg/m^3$.Atmospheric pressure =$75$cm of Hg & density of mercury =$13600Kg/m^3$
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
difficult
asked
May 12, 2014
by
sreemathi.v
1
answer
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