The following truth table corresponds to the logic gate :
A body of mass 10 g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm. What is the work done to take the body far away from the sphere against the gravitational force between them?
Two coils each of self-inductance L are closely wound in series, if the sense of their winding are opposite. The equivalent inductance is :
A string in a musical instrument is 50 cm long and its fundamental frequency is 270 Hz. If a frequency of 1000 Hz is to be produced, then required length of string is
Every atom makes one free electron in copper. If 1.1 ampere current is flowing in the wire of copper having 1 mm diameter, then the drift velocity (approx.) will be (density of copper and atomic weight = 63 )
What is the change in surface energy, when a mercury drop of radius R splits up into 1000 droplets of radius r?
Water rises to a height of 10 cm in a capillary tube, and mercury falls to a depth of 3.42 cm in the same capillary tube. If the density of mercury is 13.6 gm/ and the angle of contact is , the ratio of surface tension for water and mercury is
If T is surface tension of soap solution, the amount of work done in blowing a soap bubble from diameter D to a diameter 2D is
In Young’s two slits interference experiment if the distance between the silts is made three fold the fringe width becomes :
If all the ice on the polar caps of the earth melts, due to global warming then the duration of the day will be
A zener diode has a breakdown voltage of 5 V with a maximum power dissipation of 240 mW. The maximum current the diode can handle will be :
According to Bohr’s theory, the energy of radiation emitted in the transition from the third excited state to the first excited state for a hydrogen atom is
Two sound waves have wavelengths m and m in air. Each wave produces 4 beats/seconds with a third note of fixed frequency. Find the frequency of the third note.
The 22 cm radio wave emitted by hydrogen in interstellar space is due to the interaction call the hyperfine interaction in atomic hydrogen. What is the energy of the emitted wave ?
When ultraviolet rays are incident on a photosensitive metal plate, photoemission is not possible. But it is possible by the incidence of
An electric dipole consisting of two opposite charges of C, each separated by a distance of 3 cm is placed in an electric field of newton/coulomb. The maximum torque on the dipole will be
Two flat metal plates 2 cm apart are connected to a 1000 V battery. A proton with a positive charge of C is located between these plates. Find the force on the proton in newtons
Distance of geostationary satellite from the centre of earth is
The distance of converge of transmitting antenna is 12.8 km, then the height of antenna is (Radius of earth = 6400 km)
What will be the centripetal force if angular speed of a particle in UCM is doubled.
The deflection in a moving coil galvanometer falls from 50 divisions to 10 divisions, when a shunt of is applied. The resistance of galvanometer is :
The period of revolution of planet A around the sun is 8 times that of B. The distance of planet A from sun is how many times of B from sun.
The speed of sound in oxygen at a certain temperature is 460 m/s. What is the speed of sound in Helium at the same temperature ?
What is the equivalent resistance across and in the figure shown below, if.
The parallel plates have equal and opposite charge. When the space between them is evacuated, the electric field between the plates is V/m. When the space is filled with dielectric, the electric field becomes V/m. The dielectric constant of the dielectric material
By keeping the moment of inertia of a rotating body constant, if we double the time period, then the angular momentum of the body
The displacement of a particle performing SHM is and magnitude of its acceleration is . The frequency of the particle is approximately:
Two points are located at a distance of m and m from the source of oscillation. The period of oscillation is s and the velocity of the wave is . What is the phase difference between the oscillations of two points?
What are the readings of the ammeters and shown in figure neglect the resistances of the meters :
Two coil ‘A’ and ‘B’ have 100 and 200 turns respectively. A current of 1 A in a coil A cause a flux per turn of to link with 'A' and a flux per turn of through 'B'. The ratio of mutual inductance of A and B is :
A circular loop of radius 0.1 m carrying a current of 20 A is held perpendicular to the uniform magnetic induction of 0.02 tesla. The torque acting on this loop is :
A wheel rotates at 2 rad/sec. The number of revolutions made by the wheel at the end of 10 sec will be
Fluids can develop
A perpendicular drawn to the wavefront in the direction of propagation of light is
A radio station broadcasts at frequency of 100 MHz. If the radiating power of the transmitter is 66.6 KW, then the number of photons radiated per second is [Take h = ]
The magnitude of the angular momentum of the earth revolving round the sun is proportional to where R is the distance between the earth and the sun. what is the value of n? (Assume the orbit to be circular)
The magnetic flux ( in weber) in a closed circuit of resistance 10 ohm varies with time t according to the equation . The magnitude of induced current at second should be :
For the Wheatstone bridge to be balanced, the value of X must be
An ammeter , a voltmeter and resistance R are connected as shown in figure. If the voltmeter reading is 1.6 V and ammeter reading is 0.4 A, the resistance R is
A source is moving towards observer with a speed of 20 m/s and having frequency 240 Hz and observer is moving towards source with a velocity of 20 m/s. What is the apparent frequency heard by observer if velocity of sound is 340 m/s ?
A force of is required for breaking a material. If density of the material is . Then the length of wire made of material so that it breaks under its own weight is .
In a transistor the value of is 200, the value of is :
What is the minimum velocity to be imparted to simple pendulum so that it rises to height of 200 cm ( g = 9.8 m/ )
A sonometer wire resonates with a given tuning fork forming standing waves with five antinodes between the two bridges when a mass of 9 kg is suspended from the wire. When this mass is replaced by a mass M, the wire resonates with the same tuning fork forming three antinodes for the same position of bridges. The value of M is,
A wire is suspended vertically from one end is stretched by attaching a weight of 20 N to the lower end. The weight stretches the wire by 2mm. How much energy is gained by the wire ?
A black body at a temperature of radiates heat at a rate of 5 . At a temperature of , the rate of heat radiated per unit area will be
A rectangular coil of 200 turns and area of cross-section 25 square cm has a resistance of 100 ohm. If a magnetic field which is perpendicular to the plane of the coil changes at a rate of 100 tesla per sec, the current in the coil is,
If the pressure of an ideal gas is decreased by 10% isothermally, then its volume will
The number of wavelength of electromagnetic radiation of wavelength 8000 A in a path of 4 cm in vaccum is
Interference pattern is obtained on a screen due to two identical coherent sources of monochromatic light. The intensity of the central bright fringe is I when one of the two sources is blocked, its intensity becomes . The intensity in two situations are related as :