Recent questions tagged modelpaper

What volume of oxygen gas ($O_2$) measured at $0^{\circ}C$ and 1 atm, is needed to burn completely 1L of propane gas $(C_3H_8)$ measured under the same conditions?

asked Dec 16, 2013 by thanvigandhi_1

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The bromination of acetone that occurs in acid solution is represented by this equation $ CH_3COCH_3(aq)+Br_2(aq) \rightarrow CH_3COCH_2Br(aq) +H^+(aq)+Br^-(aq)$

asked Dec 16, 2013 by thanvigandhi_1

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The measurement of the electron position is associated with an uncertainty in momentum, which is equal to $ 1 \times 10^{-18} g\: cm\: s^{-1}$ . The uncertainty in electron velocity is, ( mass of an electron is $ 9 \times 10^{-28}g)$

asked Dec 16, 2013 by thanvigandhi_1

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Which of the following are not state functions ?

asked Dec 16, 2013 by thanvigandhi_1

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Kohlrausch's law states that at :

asked Dec 16, 2013 by thanvigandhi_1

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If 'a' stands for the edge length of the cubic systems : simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively

asked Dec 16, 2013 by thanvigandhi_1

1 answer

The value of equilibrium constant of the reaction $ HI (g) \rightleftharpoons \large\frac{1}{2} H_2(g) + \large\frac{1}{2} I_2$ is 8.0. The equilibrium constant of the reaction $H_2(g) +I_2(g) \rightleftharpoons 2HI(g) $ will be :

asked Dec 16, 2013 by thanvigandhi_1

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If a gas expands at constant temperature, it indicates that,

asked Dec 16, 2013 by thanvigandhi_1

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If uncertainty in position and momentum are equal, then uncertainty in velocity is :

asked Dec 16, 2013 by thanvigandhi_1

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A p-n photodiode is made of a material with a band gap of 2.0eV. The minimum frequency of the radiation that can be absorbed by the material is nearly :

asked Dec 16, 2013 by thanvigandhi_1

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The circuit is equivalent to

asked Dec 16, 2013 by thanvigandhi_1

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If the lattice parameter for a crystalline structure is 3.6 A, then the atomic radius in fcc crystal is :

asked Dec 16, 2013 by thanvigandhi_1

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The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be :

asked Dec 16, 2013 by thanvigandhi_1

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If M ( A;Z), $M_p\: and \: M_n$ denote the masses of the nucleus $ ^A_ZX,$ proton and neutron respectively in units of $u\: (1u=931.5Mev/C^2)$ and BE represents its bonding energy in MeV, then :

asked Dec 16, 2013 by thanvigandhi_1

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Two nuclei have their mass numbers in the ratio of 1 : 3. The ratio of their nuclear densities would be :

asked Dec 16, 2013 by thanvigandhi_1

1 answer

Two radioactive materials $ X_1\: and\: X_2$ have decay constants $ 5\lambda\: and\: \lambda$ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of $ X_1$ to that of $ X_2$ will be $ \large\frac{1}{e}$ after a time :

asked Dec 16, 2013 by thanvigandhi_1

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The ground state energy of hydrogen atom is -13.6eV. When its electron is in the first excited state, its excitation energy is :

asked Dec 16, 2013 by thanvigandhi_1

1 answer

A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of $ 3 \times 10^6\: ms^{-1}$. The velocity of particle is :

asked Dec 16, 2013 by thanvigandhi_1

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The work function of a surface of a photosensitive material is 6.2 e.V. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the :

asked Dec 16, 2013 by thanvigandhi_1

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In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of :

asked Dec 16, 2013 by thanvigandhi_1

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In a a.c circuit the e.m.f (e) and the current (i) at any instant are given respectively by :

asked Dec 16, 2013 by thanvigandhi_1

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A long solenoid has 500 turns. When a current of 2 ampere is passed through it, the resulting magnetic flux linked with each turn of the solenoid is $ 4 \times 10^{-3}\: \omega b$. The self - inductance of the solenoid is :

asked Dec 16, 2013 by thanvigandhi_1

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Curie temperature is the temperature above which :

asked Dec 16, 2013 by thanvigandhi_1

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A galvonometer of resistance $ 50 \Omega$ is connected to a battery of 3V along with a resistance of $ 2950 \Omega$ in series. A full scale deflection of 30 divisions is obtained in the galvonometer. In order to reduce this deflection to 20 divisions, the resistance in series should be :

asked Dec 16, 2013 by thanvigandhi_1

1 answer

A circular disc of radius 0.2 m is placed in a uniform magnetic field of inducion $ \large\frac{1}{\pi} \bigg( \large\frac{ \omega b}{m^2} \bigg) $ in such a way that its axis makes an angle of $60^{\circ}$ with $ \overrightarrow B$. The magnetic flux linked with the disc is :

asked Dec 16, 2013 by thanvigandhi_1

0 answers

A closed loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments PS, SR and RQ are $ F_1, F_2 \: and \: F_3$ respectively and are in the plane of the paper and along the directions shown, the force on the segment QP is :

asked Dec 15, 2013 by thanvigandhi_1

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A particle of mass m, charge Q and kinetic energy T enters a transverse uniform magnetic field of induction $ \overrightarrow B$. After 3 seconds the kinetic energy of the particle will be :

asked Dec 15, 2013 by thanvigandhi_1

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A current of 3 amp flowsw through the $ 2 - \Omega$ resistor shown in the circuit. The power dissipated in the $ 5 - \Omega $ resistor is :

asked Dec 15, 2013 by thanvigandhi_1

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An electric kettle takes 4A current at 220 V. How much time will it take to boil 1kg of water from temperature $20^{\circ}C$ ? The temperature of boiling water is $ 100^{\circ}C$.

asked Dec 15, 2013 by thanvigandhi_1

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In the circuit shown, the current through the 4$ \Omega$ resistor is 1 amp when the points P and M are connected to a d.c voltage source. The potential difference between the points M and and N is :

asked Dec 15, 2013 by thanvigandhi_1

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A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively :

asked Dec 15, 2013 by thanvigandhi_1

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A cell can be balanced again 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of 10$\Omega$. Its internal resistance is :

asked Dec 15, 2013 by thanvigandhi_1

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The electric potential at a point in free space due to a charge Q coulomb is $ Q \times 10^{11}$ volts. The electric field at that point is :

asked Dec 15, 2013 by thanvigandhi_1

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A thin conducting ring of radius R is given a charge +Q. The electric field at the centre O of the ring due to the charge on the part AKB of the ring is E. The electric field at the centre due to the charge on the part ACDB of the ring is :

asked Dec 15, 2013 by thanvigandhi_1

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The energy required to charge a parallel plate condenser of plate separation d and plate area of cross - section A such that the uniform electric field betwen the plates is E, is :

asked Dec 15, 2013 by thanvigandhi_1

1 answer

A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is $ 1.39 \times 10^9m$ and its mean distance from the earth is $ 1.5 \times 10^{11}m$. What is the diameter of the sun's image on the paper ?

asked Dec 15, 2013 by thanvigandhi_1

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Two thin lenses of focal lengths $f_1 \: and \: f_2$ are in contact and coxial. The power of the combination is :

asked Dec 15, 2013 by thanvigandhi_1

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Two periodic waves of intensities $ I_1 \: and \: I_2$ pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is :

asked Dec 15, 2013 by thanvigandhi_1

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The velocity of electromagnetic radiation in a medium of permittivity $ \in_0$ and permeability $ \mu_0$ is given by :

asked Dec 15, 2013 by thanvigandhi_1

2 answers

Two points are located at a distance of 10 m and 15 m from the source of oscillation. The period of oscillation is 0.05 sec and the velocity of the wave is 300 m / sec . What is the phase difference between the oscillation of two points ?

asked Dec 15, 2013 by thanvigandhi_1

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A point performs simple harmonic oscillation of period T and the equation of motion is given by $ x = a\: \sin \: ( wt+ \pi/6)$. After the elapse of what fraction of the time period the velocity of the point will be equal to half of its maximum velocity ?

asked Dec 15, 2013 by thanvigandhi_1

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The wave described by $y = 0.25 \: \sin \: ( 10\: \pi x\: -2\: \pi t),$ where x and y are in meters and t in seconds, is a wave travelling along the :

asked Dec 15, 2013 by thanvigandhi_1

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Two simple Harmonic motions of angular frequency 100 and 1000 rads$^{-1}$ have the same displacement amplitude. The ratio of their maximum acceleration is :

asked Dec 15, 2013 by thanvigandhi_1

1 answer

At $ 10^{\circ}C$ the value of density of a fixed mass of an ideal gas divided by its pressure is x. At $110^{\circ}C$ this ratio is :

asked Dec 15, 2013 by thanvigandhi_1

1 answer

On a new scale of temperature ( which is linear ) and called the W scale the freezing and boiling points of water are $ 39^{\circ}W \: and \: 239^{\circ} W$ respectively. What will be the temperature on the new scale, corresponding to a temperature of $39^{\circ}$C on the Celcius scale ?

asked Dec 15, 2013 by thanvigandhi_1

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If Q E and W denote respectively the heat added, change in internal energy and the work done in a closed cycle process, then :

asked Dec 15, 2013 by thanvigandhi_1

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A roller coaster is designed such that riders experience " weightlessness" as they go round the top of a hill whose radius of curvature is 20m. The speed of the car at the top of the hill is between

asked Dec 14, 2013 by thanvigandhi_1

1 answer

A thin rod of length L and mass M is bent at its midpoint into two halves so that the angle between them is $90^{\circ}$ . The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is :

asked Dec 14, 2013 by thanvigandhi_1

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The ratio of the radii of gyration of a circular disc to that of a circular ring each of same mass and radius, around their respective axes is :

asked Dec 14, 2013 by thanvigandhi_1

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A shell of mass 200 gm is ejected from a gun of mass 4 kg by an explosion that generates 1.05kJ of energy . The initial velocity of the shell is :

asked Dec 14, 2013 by thanvigandhi_1

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