Recent questions tagged 1998

The base found in DNA but not in RNA :

asked Jun 15, 2018 by pady_1

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Glucose +x phenyl hydrazine $\rightarrow$ osazone 'x' will be :

asked Jun 15, 2018 by pady_1

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Percentage of C, H & N are given as follows : C = 40% H = 13.33% N = 46.67% The empirical formula will be :

asked Jun 15, 2018 by pady_1

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Which of the following does not give claisen condensation reaction :

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Which of the following is not the characteristic of arenes :

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Which of the following does not given iodoform test :

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IUPAC name of

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Aspirin can be prepared by the reaction of acetyl chloride with :

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Correct order of –I effect is :

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A particle, with restoring force proportional to displacement and resisting force proportional to velocity is subjected to a force F sin $\omega$t. If the amplitude of the particle is maximum for $\omega$ = $\omega_{1}$ and the energy of the particle maximum for $\omega$ = $\omega_{2}$, then :

asked Jun 15, 2018 by pady_1

1 answer

A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then the electric field at Q is proportional to :

asked Jun 15, 2018 by pady_1

2 answers

We consider a thermodynamic system. If $\Delta$U represents the increase in its internal energy and W the work done by the system, which of the following statements is true ?

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Common emitter circuit is used as amplifier, its current gain is 50. If input resistance is 1 k$\Omega$ and input voltage is 5 volt then output current will be :

asked Jun 15, 2018 by pady_1

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The cause of potential barrier in a P–N junction diode is :

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Radiation energy corresponding to the temperature T of the sun is E. If its temperature is doubled, then its radiation energy will be :

asked Jun 15, 2018 by pady_1

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A rigid rod is placed against the wall as shown in figure. When its velocity of lower end is $10 ms^{ â€“1}$ and its base makes an angle $\alpha$ = 60Â° with horizontal, then the vertical velocity of its end B will be :

asked Jun 15, 2018 by pady_1

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for nuclear reaction : $_{92}U^{235} +_0 n^1 \longrightarrow _{56}Ba^{144}+........+3_0n^1$

asked Jun 15, 2018 by pady_1

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If a source moves perpendicularly from listener then the change in frequency will be :

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Turn ratio of a step-up transformer is 1 : 25. If current in load coil is 2A, then the current in primary coil will be :

asked Jun 15, 2018 by pady_1

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Electric field at the equator of a dipole is E. If strength and distance is now doubled then the electric field will be :

asked Jun 15, 2018 by pady_1

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In the Bohr model of H-atom, an electron (e) is revolving around a proton (p) with velocity v, if r is the radius of orbit and m is mass and $\varepsilon_{0}$ is vacuum permittivity, the value of v is :

asked Jun 15, 2018 by pady_1

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A charge q is placed in an uniform electric field E. If it is released, then the K.E of the charge after travelling distance y will be :

asked Jun 15, 2018 by pady_1

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A car is moving with velocity V. If stop after applying break at a distance of 20 m. If velocity of car is doubled, then how much distance it will cover (travel) after applying break :

asked Jun 15, 2018 by pady_1

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In hot wire Ammeter due to flowing of current temperature of wire is increased by 5°C. If value of current is doubled, then increases in temperature will be :

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A standing wave having 3 nodes and 2 antinodes is formed between 1.21 Å distance then the wavelength is :

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If the frequency of a spring is n after suspending mass M, now 4M mass is suspended from spring then the frequency will be :

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For the diffraction from a crystal with $\lambda$ = 1Å and Bragg's angle $\theta$ = 60°, then for the second order diffraction 'd' will be :

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Two long parallel wires are at a distance of 1m. If both of them carry one ampere of current in same direction, then the force of attraction on unit length of the wires will be :

asked Jun 15, 2018 by pady_1

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A ball is dropped from a height of 5 m, if it rebound upto height of 1.8 m, then the ratio of velocities of the ball after and before rebound is :

asked Jun 15, 2018 by pady_1

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When three identical bulbs are connected in series, the consumed power is 10W. If they are now connected in parallel then the consumed power will be :

asked Jun 15, 2018 by pady_1

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A gas of volume changes 2 litre to 10 litre at constant temperature 300K, then the change in internal energy will be :

asked Jun 15, 2018 by pady_1

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When volume changes from V to 2V at constant pressure(P) then the change in internal energy will be :

asked Jun 15, 2018 by pady_1

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O is the centre of an equilateral triangle ABC $\overrightarrow {F_1} $ , $\overrightarrow {F_2} $ , $\overrightarrow {F_3} $ are three forces acting along the sides AB, BC and AC as shown in fig. What r should be the magnitude of $\overrightarrow {F_3} $ so that total torque about O is zero : :

asked Jun 15, 2018 by pady_1

1 answer

For a Rocket propulsion velocity of exhaust gases relative to rocket is 2 km/s. If mass of rocket system is 1000 kg, then the rate of fuel consumption for a rocket to rise up with acceleration $4.9 m/s^{2}$ will be :

asked Jun 15, 2018 by pady_1

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If a ladder is not in balance against a smooth vertical wall, then it can be made in balance by :

asked Jun 15, 2018 by pady_1

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Resistance of a Galvanometer coil is 8$\Omega$ and 2$\Omega$ Shunt resistance is connected with it. If main current is 1 A then the current flow through 2$\Omega$ resistance will be :

asked Jun 15, 2018 by pady_1

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Two coil have a mutual inductance 0.005 H. The current changes in first coil according to equation $I = I_{0}$ sin $\omega$t where $I_{0} = 2A$ and $\omega= 100\pi$ rad/sec. The maximum value of emf in second coil is :

asked Jun 15, 2018 by pady_1

1 answer

If time of mean position from amplitude (extreme) position is 6 s. then the frequency of SHM will be :

asked Jun 15, 2018 by pady_1

1 answer

Work function of a metal surface is $\phi$ = 1.5 eV. If a light of wavelength 5000Å falls on it then the maximum K.E. of ejected electron will be -

asked Jun 15, 2018 by pady_1

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$10^{5}$ coloumb charge liberated 1 gm silver (Ag). If now charge is doubled then the amount of liberated Ag will be :

asked Jun 15, 2018 by pady_1

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Light enters at an angle of incidence in a transparent rod of refractive index n. For what value of the refractive index of the material of the rod, the light once entered into it will not leave it through its lateral face whatsoever be the value of angle of incidence :

asked Jun 15, 2018 by pady_1

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One part of a device is connected with the negative terminal of a battery and another part is connected with the positive terminal of a battery. If their ends now altered, current does not flow in circuit, then the device will be :

asked Jun 15, 2018 by pady_1

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A small ball is suspended from a thread. It is lifted up with an acceleration $4.9 ms^{–2}$ and lowered with an acceleration $4.9 ms^{–2}$ then the ratio of tensions in the thread in both cases will be :

asked Jun 15, 2018 by pady_1

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Two identical balls A and B are moving with velocity $+0.5\; ms^{–1}$ and $– 0.3\; ms^{–1}$ respectively. They collide head on elastically then their velocities after collision will be :

asked Jun 15, 2018 by pady_1

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The speed of a boat is $5\; km/hr$ is still water. It crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of river water is :

asked Jun 15, 2018 by pady_1

1 answer

A coil of one loop is made from a wire of length L and thereafter a coil of two loops is made from same wire, then the ratio of magnetic field at the centre of coils will be :

asked Jun 15, 2018 by pady_1

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If the light of wavelength $\lambda$ is incident on metal surface, the ejected fastest electron has speed v. If the wavelength is changed to $\frac {3\lambda} {4}$ , the speed 4 of the fastest emitted electron will be :

asked Jun 15, 2018 by pady_1

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A particle of mass m is tied to a string of length L and whirled into a horizontal plan. If tension in the string is T then the speed of the particle will be :

asked Jun 15, 2018 by pady_1

2 answers

Half life period of two elements are 40 minute and 20 minute respectively, then after 80 minute ratio of the remaining nuclei will be (Initially both have equal active nuclei) :

asked Jun 15, 2018 by pady_1

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If force $F = 500 – 100t$, then function of impulse with time will be :

asked Jun 15, 2018 by pady_1

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