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Recent questions tagged physics
Questions
The magnetic field of earth at the equator is approximately $\; 4 \times 10^{-5} \;T\;$ The radius of earth is $\;6.4 \times 10^{6}\;m\;$.Then the dipole moment of the earth will be nearly of the order of :
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
1
answer
The mid - points of two small magnetic dipoles of length d in end - on positions , are separated by a distance x, (x >> d) . The force between them is proportional to $\;x^{-n}\;$ where n is :
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
0
answers
A d.c. main supply of e.m.f. 220 V is connected across a storage battery of e.m.f. 200 V through a resistance of $\;\Omega\;$. The battery terminals are connected to an external resistance ' R ' . The minimum value of ' R ' , so that a current passes through the battery to charge it is :
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
0
answers
Three capacitance ,each of $\;3 \;mu F\;$ , are provided . These can not be combined to provide the resultant capacitance of :
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
0
answers
The magnitude of the average electric field normally present in the atmosphere just above the surface of the Earth is about 150 N/C , directed inward towards the centre of the earth .This gives the total net surface charge carried by the Earth to be : $\;[Given \;\in_{0} =8.85 \times 10^{-12} \;C^{2}/N-m^{2} , R_{E} = 6.37 \times 10^{6}\;m\;]$
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
0
answers
A transverse wave is represented by : $\;y=\large\frac{10}{\pi} sin (\large\frac{2 \pi}{T} t - \large\frac{2 \pi}{\lambda} x)\;$ . For what value of the wavelength the wave velocity is twice the maximum particle velocity ?
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
1
answer
Modern vacuum pumps can evacuate a vessel down to pressure of $\;4.0 \times 10^{-15}\;atm\;$.at room temperature (300 K). Taking $\;R=8.3 JK^{-1}mole^{-1},1\;atm=10^{5}\;Pa\;$and $\;N_{Avogadro}=6 \times 10^{23}\;mole^{-1}\;$ the mean distance between molecules of gas in an evacuated vessel will be the order of :
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
0
answers
The equation of state for a gas is given by $\;PV=nRT+ \alpha V\;$ ,where n is the number of moles and $\;\alpha\;$ is a positive constant . The initial temperature and pressure of one mole of the gas contained in a cylinder are $\;T_{0}\;$ and $\;P_{0}\;$ respectively . The work done by the gas when its temperature doubles isobarically will be :
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
0
answers
Water of volume 2 L in a closed container is heated with a coil of 1kW .While water is heated , the container loses energy at a rate of 160 J/s . In how much time will the temperature of water rise from $\;27^{0}C\;$ to $\;77^{0}C\;$ ? (Specific heat of water is 4.2 kJ/kg and that of the container is negligible) .
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
0
answers
A capillary tube is immersed vertically in water and the height of the water column is x .When this arrangement is taken into a mine of depth d , the height of the water column is y .If R is the radius of the earth , the ratio $\;\large\frac{x}{y}\;$ is :
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
0
answers
The amplitude of a simple pendulum , oscillating in air with a small spherical bob, decreases from 10 cm to 8 cm in 40 seconds .Assuming that Stokes law is valid , and ratio of the coefficient of viscosity of air to that of carbon dioxide is 1.3 , the time in which amplitude of this pendulum will reduce from 10 cm to 5 cm in carbondioxide will close to (ln 5=1.601, ln 2=0.693)
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
0
answers
In materials like aluminium and copper , the correct order of magnitude of various elastic modulii is :
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
0
answers
India's mangalyan was sent to the mars by launching it into a transfer orbit EOM around the sun .It leaves the earth at E and meets mars at M.If the semi - major axis of earth's orbit is $\;a_{e}=1.5 \times 10^{11} m\;$ , that of Mar's orbit $\;a_{m}=2.28 \times 10^{11} m\;$, taken Kepler's law give the estimate of time for mangalyan to reach Mars from Earth to be close to :
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
1
answer
A cylinder of mass $\;M_{c}\;$ and sphere of mass $\;M_{s}\;$ are placed at points A and B of two inclines, respectively .(see figure) . If they role on the incline without slipping such that their accelerations are the same , then the ratio $\; \large\frac{sin \theta_{c}}{sin\theta_{s}}\;$ is :
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
0
answers
Two bodies of masses 1 kg and 4 kg are connected to a vertical spring , as shown in the figure . The smaller mass executes simple harmonic motion of angular frequency 25 rad/s , and amplitude 1.6 cm while the bigger mass remains stationary on the ground . The maximum force exerted by the system on the floor is (take g=$\;10 ms^{-2}$) .
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
1
answer
A block A of mass 4 kg is placed on another block B of mass 5 kg , and the block B rests on a smooth horizontal table . If the minimum force that can be applied on A so that both the blocks move together is 12 N , the maximum force that can be applied on B for the blocks to move together will be :
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
1
answer
Water is flowing a speed of $\;1.5 ms^{-1} \;$ through a horizontal tube cross - sectional area $\;10^{-2}m^{2}\;$ and you are trying to stop the flow by your palm . Assuming that the water stops immediately after hitting the palm , the minimum force that you must exert should be (density of water =$\; 10^{3}\;kgm^{-3}\;$).
jeemain
physics
2014
set-01
asked
May 3, 2014
by
yamini.v
1
answer
The position of a projectile launched from the origin at t=0 is given by $\;\overrightarrow{r}=(40 \hat{i} + 50 \hat{j}) \;m\;$ at $\;t=2s\;$. If the projectile was launched at an angle $\;\theta\;$ from the horizontal , then $\;\theta\;$ is (take $\;g=10\;ms^{-2}$).
jeemain
physics
2014
set-01
asked
May 2, 2014
by
yamini.v
0
answers
An experiment is performed to obtain the value of acceleration due to gravity g by using a simple pendulum of length L .In this experiment time for 100 oscillations is measured by using a watch of 1 second least count and the value is 90.0 seconds .The length L is measured by using a meter scale of least count 1 mm and the value is 20.0 cm.The error in the determination of g would be :
jeemain
physics
2014
set-01
asked
May 2, 2014
by
yamini.v
1
answer
Temperature of $4 mol$ of an ideal gas occupying $5 dm^3$ at $3.32\; bar \; (R= 0.083\;bar \;dm^3 K)$
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
easy
asked
May 2, 2014
by
meena.p
1
answer
$4g$ of $O_2$ gas has pressure $P_0$ ad temperature $T_o$ i a vessel . On keeping the Sample at $50^{\circ}\;C$ higher temperature, $1g$ gas is given ad to maintain the original pressure $P_0$ . Then $T_0=?$
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
easy
asked
May 2, 2014
by
meena.p
1
answer
The r ms speed of the molecules of a ideal gas which is at a pressure $10^5 \;m^{-2}$ & density $45\;kgm^{-3}$ is _________
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
easy
asked
May 2, 2014
by
meena.p
1
answer
Boltzmann curve is given below :
jeemain
physics
kinetic-theory-of-gases
cbse
class11
ch13
medium
asked
May 2, 2014
by
meena.p
1
answer
The reason why $Cp$ is greater than $Cv$ is _______
jeemain
physics
kinetic-theory-of-gases
specific-heat-capacity
molar-specific-heat
class11
ch13
medium
asked
May 2, 2014
by
meena.p
1
answer
The graph of PV v/s T is plotted for $Co_2,H_2$ and $N_2$ samples of equal masses Then the correct statement is
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
medium
asked
May 2, 2014
by
meena.p
1
answer
In the reaction , $\;CH_{3}OOH\; \underrightarrow{LiAlH_{4}}\; A \; \underrightarrow{PCl_{5}}\;B\;\underrightarrow{Alc.KOH}\;C \; $ , the product C is :
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
Which one of the following bases is not present in DNA ?
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
Which one is classified as a condensation polymer ?
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
Considering the basic strength of amines in aqueous solution , which one has the smallest $\;pK_{b}\;$ value ?
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
The major organic compound formed by the reaction of 1 ,1 ,1 - trichloroethane with silver powder is :
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
1
answer
The most suitable reagent for the conversion of $\;R - CH_{2} - OH \to R - CHO \; $ is :
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
On heating an aliphatic primary amine with chloroform and ethanolic potassium hydroxide , the organic compound formed is :
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
1
answer
In $\;S_{N}2\;$ reactions , the correct order of reactivity for the following compounds : $\;CH_{3}Cl\;,CH_{3}CH_{2}Cl\;,(CH_{3})_{2}CHCl\;$ and $\;(CH_{3})_{3}CCl\;$ is :
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
The equation which is balanced and represents the correct product(s) is :
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
Which series of reactions correctly represents chemical reactions related to iron its compound ?
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
Given below are the half - cell reactions : $\;Mn^{2+}+2e^{-} \to Mn\;:E^{0}=-1.18\;V\;$ $\qquad \qquad \qquad \qquad\;$ $\qquad \qquad \qquad \qquad\;$ $\;2(Mn^{3+}+e^{-} \to Mn^{2+})\;:E^{0}=+1.51\;V\;$ $\qquad \qquad \qquad \qquad\;$ $\qquad \qquad \qquad \qquad\;$ $\qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad\;$ The $\;E^{0}\;$ for $\;3Mn^{2+} \to Mn +2Mn^{+}\;$
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture 1:4 . The ratio of number of their molecule is :
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
The correct statement for the molecule , $\;CsI_{3}\;:$ is
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
In which of the following reactions $\;H_{2}O_{2}\;$ acts as a reducing agent ?\[\] (1) $H_{2}O_{2}+2H^{+}+2e^{-} \to 2H_{2}O$\[\] (2) $H_{2}O_{2}-2e^{-} \to O_{2} + 2H^{+}$\[\] (3) $H_{2}O_{2}+2e^{-} \to 2OH^{-}$\[\] (4) $H_{2}O_{2}+2OH^{-}-2e^{-} \to O_{2} + 2H^{2}O$
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
Which one of the following properties is not shown by NO ?
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
The octahedral complex of a metal ion $\;M^{3+}\;$ with four monodentate ligands $\;L_{1}\;,L_{2}\;,L_{3}\;$ and $\;L_{4}\;$ absorb wavelengths in the region of red ,green ,yellow and blue respectively .The increasing order of ligand strength of the four ligands is :
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
The metal that can not be obtained by electrolysis of an aqueous solution of its salts is :
jeemain
physics
2014
set-e
asked
May 1, 2014
by
yamini.v
0
answers
Among the following oxoacids , the correct decreasing order of acid strength is :
jeemain
physics
2014
set-e
asked
Apr 30, 2014
by
yamini.v
0
answers
Consider separate solutions of 0.500 M $\;C_{2}H_{5}OH(aq)\;$ ,0.100 M $\;Mg_{3}(PO_{4})_{2}(aq)\;$ ,0.250 M $\;KBr(aq)\;$ and 0.125 M $\;Na_{3}PO_{4}(aq)\;$ at $\;25^{0}C\;$.Which statement is true about these solutions , assuming all salts to be strong electrolytes ?
jeemain
physics
2014
set-e
asked
Apr 30, 2014
by
yamini.v
0
answers
The equivalent conductance of Nacl at concentration C and at infinite dilution are $\;\lambda_{C}\;$ and $\;\lambda_{\infty}\;$,respectively .The correct relationship between $\;\lambda_{C}\;$ and $\;\lambda_{\infty}\;$ is given as : (Where the constant B is positive)
jeemain
physics
2014
set-e
asked
Apr 30, 2014
by
yamini.v
0
answers
For complete combustion of ethanol , $\;C_{2}H_{5}OH(l)+3O_{2}(g)\to 2CO_{2}(g)+3H_{2}O(l) \;$, the amount of heat produced as measured in bomb calorimeter is ,1364.47 $\;kJmol^{-1}\;$ at $\;25^{0}C\;$.Assuming ideality the Enthalpy of combustion , $\bigtriangleup_{c}H\;$,for the reaction will be : $\;(R=8.314 kJmol^{-1})\;$
jeemain
physics
2014
set-e
asked
Apr 30, 2014
by
yamini.v
0
answers
Resistance of 0.2 M solution of an electrolyte is $\;50 \;\Omega\;$.The specific conductance of the solution is $\;1.4\;Sm^{-1}\;$.The resistance of 0.5 M solution of the same electrolyte is 280$\;\Omega\;$.The molar conductivity of 0.5 M solution of the electrolyte in $\;Sm^{2}mol^{-1}\;$ is :
jeemain
physics
2014
set-e
asked
Apr 30, 2014
by
yamini.v
0
answers
For the estimation of nitrogen , 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of $\;\large\frac{M}{10}\;$ sulphuric acid . The unreacted acid required 20 mL of $\;\large\frac{M}{10}\;$ sodium hydroxide for complete neutralization .The percentage of nitrogen in the compound is :
jeemain
physics
2014
set-e
asked
Apr 30, 2014
by
yamini.v
0
answers
CsCl crystallises in body centred cubic lattice .If ' a ' is its edge length then which of the following expressions is correct ?
jeemain
physics
2014
set-e
asked
Apr 30, 2014
by
yamini.v
0
answers
If Z is a compressibility factor ,van der waals equation at low pressure can be written as :
jeemain
physics
2014
set-e
asked
Apr 30, 2014
by
yamini.v
1
answer
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