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Recent questions tagged physics
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Sound wave can be
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
A choke is used to
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Ultra violet mercury lamp is made of quartz and not glass because
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Accuracy of a potentio meter does not depends on
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
A sensitive galvanometer is one which
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Which of the following instrument has largest resistance.
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
In Newton's cooling experiment to reduce loss of heat the calorimeter should have .
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Coolant in radiations automobile must be
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
2
answers
Calculate $ \Delta H_{C-H}$ from the following data: $ \Delta H^{\circ}_{combustion}$ of ethane and propane are $-372$ and $-530\: kcal/mol$ respectively, $ \Delta H_f^{\circ}$ of $CO_2(g)$ and $H_2O(l)$ are $-94$ and $-68\: kcal/mol,\: \Delta H^{\circ}$ for $C(graphite) \rightarrow C(g)\: is\: 172\: kcal \: and\: \Delta H_{H-H} \: is\: 104 \: kcal.$
jeemain
physics
thermodynamics
cbse
class11
class12
q74
difficult
asked
Mar 19, 2014
by
thanvigandhi_1
1
answer
This symbol represents
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Estimate the value of $ \Delta S^{\circ}_{298}$ for the dissociation of calcium carbonate given that, $ \Delta H^{\circ}_{298}$ for the reaction is $178\: kJ$. The equilibrium pressure is one bar at $897^{\circ}C.(R = 8.314\: J/Kmol)$
jeemain
physics
thermodynamics
cbse
class11
class12
q73
difficult
asked
Mar 19, 2014
by
thanvigandhi_1
1
answer
In the stress - strain graph for a wire Breaking point, yield point and Elastic limit are represented by points
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Calculate the bond energy of $ C-H$ bond in methane from the following data: \[\] $C(s) + 2H_2(g) \rightarrow CH_4(g);\: \: \: \Delta H = -74.8\: kJ$ \[\] $ H_2(g)\rightarrow 2H(g);\Delta H = 435.4\: kJ$ \[\] $ C(s) \rightarrow C(g);\Delta H = 718.4 \: kJ$
jeemain
physics
thermodynamics
cbse
class11
class12
q72
difficult
asked
Mar 19, 2014
by
thanvigandhi_1
1
answer
The output current versus time graph of a Diode as a rectifier The average value of output current is :
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Find the temperature as a function of radius r in case of a cylindrical shell whose inner surface temperature and outer surface temperature are $ \theta_1$ and $ \theta_2$. The inner and outer radii of the cylindrical shell are $r_1$ and $r_2$.
jeemain
physics
thermodynamics
cbse
class11
class12
q71
difficult
asked
Mar 19, 2014
by
thanvigandhi_1
1
answer
A solid ball of steel is heated to $200^{\circ}\;C$ and left to cool. Which of the curve will show cooling of the ball.
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Three different materials are studied by plotting the graph between temperature against time as shown. Which is best preferred as
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physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
To find focal length of convex lens using $U-V$ method. the graph between u and v is
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Angle of minimum deviation $\delta _m$ in a Prism depends on
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Part of the galvanometer which has electrical resistance is
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
The precaution to be taken during determination of young's modulus using Searl's apparatus 1) Micrometer screw should be rotated in same direction while taking reading. 2) Reading should be taken immediately after loading or unloading to the experimental wire 3) The load added should be with in elastic limit.
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
In the experiment to find the refractive index of the material of prism. by minimum deviation method $D_m$ the minimum deviation is observed from the graph plotted in the experiment . The graph is plotted between
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
To find the focal length of a convex mirror we use indirect method because ,
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
In the experiment to find internal resistance of Daniel cell using potentiometer with E as Emt of the cell 'L' the balancing length of the potentiometer wire when potentiometer circuit is closed. (when no current flows through cell. When $R= 5 \Omega $ is introduced the new balancing length is l.) Then the internal resistance of the cell is
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
The experiment to verify ohm's law and to find 3 different wires and the graph are plotted as shown.
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 18, 2014
by
meena.p
1
answer
In the Meter Bridge experiment to determine the resistance of given wire the error occurred due to non uniformity of meter bridge wire can be reduced by
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 18, 2014
by
meena.p
1
answer
In Searle's experiment to determine the young's modulus of a wire. The diameter of the given wire is measured by using
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 18, 2014
by
meena.p
1
answer
In the experiment to plot the graph between square of amplitude and time of a simple pendulum and dissipation of energy , the oscillation occur in viscous medium like air. the energy versus time graph looks like
jeemain
physics
experimental-skills-in-physics
medium
asked
Mar 18, 2014
by
meena.p
1
answer
A heat engine absorbs heat q1 from a source at temperature $T_1$ and heat $ q_2$ from a source a temperature $T_2$. Work done is found to be $J(q_1+q_2)$. This is in accordance with
jeemain
physics
thermodynamics
cbse
class11
class12
q70
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
A reaction is non-spontaneous at the freezing point of water but is spontaneous at the boiling point of water, then
jeemain
physics
thermodynamics
cbse
class11
class12
q69
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
In an irreversible process taking place at constant $T$ and $p$ and in which only pressure-volume work is being done, the change in Gibbs free energy $(dG)$ and change in entropy $(dS)$, satisfy the criteria
jeemain
physics
thermodynamics
cbse
class11
class12
q68
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
A copper wire of length L and cross sectional Area A is used and the corresponding current Vs voltage graph is drawn as shown.The slope of the curve becomes
jeemain
physics
experimental-skills-in-physics
medium
asked
Mar 18, 2014
by
meena.p
1
answer
If the bond dissociation energies of $XY, X_2 \: and \: Y_2$(all diatomic molecules) are in the ratio of 1:1:0.5 and $ \Delta H_f $ for the formation of XY is -200 kJ/mol. The bond dissociation energy of $X_2$ will be
jeemain
physics
thermodynamics
cbse
class11
class12
q67
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
Consider the reaction $N_2 + 3H_2 \rightarrow 2NH_3$ carried out at constant temperature and pressure. If $ \Delta H\: and\: \Delta U$ are the enthalpy and internal energy changes for the reaction, which of the following expressions is true?
jeemain
physics
thermodynamics
cbse
class11
class12
q66
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
A drop of water falling in air reaches the ground with terminal momentum P. Another drop of water of twice the radius reaches the ground with terminal velocity will have momentum.
jeemain
physics
experimental-skills-in-physics
difficult
asked
Mar 18, 2014
by
meena.p
1
answer
In resonance column experiment to determine the velocity of sound, $L$ person observes first resonance at $12\;cm$. If she repeats the experiment on a very hot day her resonance column length would be
jeemain
physics
experimental-skills-in-physics
medium
asked
Mar 18, 2014
by
meena.p
1
answer
The enthalpy changes for the following processes are listed below \[\] $Cl_2(g) = 2Cl(g),\: \: \: \: \: 242.3\: kJ/mol$ \[\] $I_2(g) = 2I(g), \: \: \: \: \: 151\: kJ/mol$ \[\] $ ICl(g) = I(g) + Cl(g),\: \: \: 211.3 \: kJ/mol$ \[\] $ I_2(s) = I_2(g),\: \: \: \: 62.76\: kJ/mol$ \[\] Given that the standard states for iodine and chlorine are $I_2(g)\: and \: Cl_2(g)$, the standard enthalpy of formation of $ICl(g)$ is
jeemain
physics
thermodynamics
cbse
class11
class12
q65
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system If $T_i$ is the initial temperature and $T_f$ is the final temperature, which of the following statements is correct?
jeemain
physics
thermodynamics
cbse
class11
class12
q64
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
Potentiometer wire is of cross sectional area $8 \times 10^{-6}m^2$ and has resistivity $40 \times 10^{-8}$. If $0.2$ amp current flows through it its potential gradient is
jeemain
physics
experimental-skills-in-physics
medium
asked
Mar 18, 2014
by
meena.p
1
answer
The standard enthalpy of formation $(\Delta H_f^{\circ} )\: at\: 298\: K$ for methane, $CH_4(g),$ is -74.8 kJ/mol. The additional information required to determine the average energy for $C-H$ bond formation would be
jeemain
physics
thermodynamics
cbse
class11
class12
q63
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
A convex lens is used in the experiment of conjugate focus method where image of the object is formed in the same place for two positions of the lens. The size of image in 1st position is $4\;cm$ and in the second position is $16 \;cm$ . The length of the object is
jeemain
physics
experimental-skills-in-physics
medium
asked
Mar 18, 2014
by
meena.p
1
answer
In conversion of limestone to lime, \[\] $CaCO_3(s) \rightarrow CaO(s) + CO_2(g)$ \[\] the values of $ \Delta H^{\circ}\: and\: \Delta S^{\circ}$ are 179 kJ/mol and 160.2 J/K respectively at 298 K and 1 bar. Assuming that $ \Delta H^{\circ} \: and \: \Delta S^{\circ}$ do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is
jeemain
physics
thermodynamics
cbse
class11
class12
q62
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
Identify correct statement regarding spontaneous process
jeemain
physics
thermodynamics
cbse
class11
class12
q61
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
Assuming that water vapor is an ideal gas, the internal energy change ($ \Delta U$) when 1 mole of water is vaporized at 1 bar pressure and $100^{\circ}C$ (molar enthalpy of vaporization of water at 1 bar and 373 K = 41 kJ/mol and R = 8.314 J/Kmol) will be
jeemain
physics
thermodynamics
cbse
class11
class12
q60
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
In a potentiometer experiment it is found that no current flows through the galvanometer when balancing length is 52 cm of potentiometer when shant resistance of $5 \Omega$ is used balancing length becomes 40 cm The internal resistance of cell is
jeemain
physics
experimental-skills-in-physics
medium
asked
Mar 18, 2014
by
meena.p
1
answer
Standard entropy of $X_2, Y_2\: and\: XY_3$ are 60, 40 and 50 J/Kmol respectively. For the reaction, \[\] $ \large\frac{1}{2}$$ X_2 + Y_2 \rightarrow XY_3;\: \: \: \: \: \: \: \: \Delta H = -30\: kJ,$ \[\] to be at the equilibrium, the temperature will be
jeemain
physics
thermodynamics
cbse
class11
class12
q59
medium
asked
Mar 18, 2014
by
thanvigandhi_1
1
answer
In an experiment to determine the Resistance of a coil it is found the volit meter values is $30.3\;V$ and ammeter reading is $0.020\;A$ least count of voltmeter is $0.1\;V$ and Least count of ammeter is $1\;mA$. The value of R is
jeemain
physics
experimental-skills-in-physics
medium
asked
Mar 18, 2014
by
meena.p
1
answer
A beam white light when passed through prism suffers dispersion. When light is passed through hollow prism it suffers.
jeemain
physics
experimental-skills-in-physics
medium
asked
Mar 18, 2014
by
meena.p
1
answer
The characteristic curve for a zener diode is shown. The zener voltage is
jeemain
physics
experimental-skills-in-physics
medium
asked
Mar 18, 2014
by
meena.p
1
answer
We use spherical pendulum bob because
jeemain
physics
experimental-skills-in-physics
medium
asked
Mar 18, 2014
by
meena.p
1
answer
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