Recent questions tagged past papers

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

asked Jun 15, 2018 by pady_1

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

$10^{5}$ 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

1 answer

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

0 answers

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

0 answers

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

0 answers

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

0 answers

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

1 answer

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

1 answer

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

1 answer

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

asked Jun 15, 2018 by pady_1

1 answer

If $x = 3 – 4t^{2} + t^{3},$ then work done in first $4s$. will be (Mass of the particle is 3 gram) :

asked Jun 15, 2018 by pady_1

1 answer

A circular ring of mass M and radius R is rotating about its axis with constant angular velocity $\omega$. Two particle each of mass m are attached gently to the opposite ends of a diameter of the ting. The angular velocity of the ring will now become :

asked Jun 15, 2018 by pady_1

2 answers

For protecting a magnetic needle it should be placed :

asked Jun 15, 2018 by pady_1

2 answers

Two pendulums suspended from same point having length 2m and 0.5m. If they displaced slightly and released then they will be in same phase, when small pendulum will have completed :

asked Jun 15, 2018 by pady_1

1 answer

For a wave $y = y_{0} \sin (\omega t – kx),$ for what value of $\lambda$ is the maximum particle velocity equal to two times the wave velocity :

asked Jun 15, 2018 by pady_1

1 answer

Following logic gate is : <br>

asked Jun 15, 2018 by pady_1

1 answer

Following table is for which logic gate : <br>

asked Jun 15, 2018 by pady_1

1 answer

A hollow sphere of radius 1m is given a positive charge of $10\mu C$. The electric field at the centre of hollow sphere will be :

asked Jun 15, 2018 by pady_1

1 answer

Boron has two isotopes $_5B^{10}$ and $_5B^{11}$. If atomic weight of Boron is 10.81 then ratio of $_5B^{10}$ to $_5B^{11}$ in nature will be :

asked Jun 15, 2018 by pady_1

2 answers

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