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In a transformer, the number of turns in primary coil and secondary coil are 5 and 4 respectively. If 240 V is applied on the primary coil, then the ratio of current in primary and secondary coil is
A bullet of mass m and velocity V is fired into a block of mass M and sticks to it. The final velocity would be
If a person with a spring balance and a body hanging from it goes up and up in an aeroplane, then reading of weight of body as indicated by spring balance will
We have two radioactive nuclei A and B. Both convert into a stable nucleus C. Nucleus A converts into Cafter emitting two ααparticles and three βparticles. Nucleus B converts into C after emitting one ααparticle and five βparticles. At time t=0, nuclei of A are 4N_{0} and that of B are N_{0}. Half life of A (into the conversion of C) is 1min and that of B is 2min. Initially number of nuclei of C are zero.
Q. What are number of nuclei of C, when number of nuclei of A and B are equal?
'n' moles of an ideal gas undergoes a process A → B as shown in the figure. The maximum temperature of the gas during the process will be Then the value of A is :
In Y.D.S.E. using light of wavelength 6000Å angular fringe width of fringe formed on the screen is 1°. Find the distance between the slits :
An electron moves in the field produced by a charged sphere of radius 10 cm along the radius connecting the points separated by 12 and 15 cm from the centre of the sphere. The velocity of the electron changes thereby from 2 × 10^{5} to 2 × 10^{6} m/s. Determine the surface charge (in nC/m^{2}) density of the sphere. (Mass of electron = 9.1 × 10^{–31} kg)
You are given a converging lens with equal radii of curvature and a diverging lens with the same radii of curvature as those of the converging lens. The lenses are made of material with n = 1.50, and the radii of curvature are all 35 cm. They are placed at opposite ends of a tube 15 cm long, and the nearer lens which is converging is 10 cm from an object. What is the location of the image that results from the two refractions? Write the final distance (in cm) from diverging lens.
The new white belt of a long horizontal conveyor is moving with a constant speed v = 3.0 m/s. A small block of carbon is placed on the belt with zero initial velocity relative to the ground. The block will slip a bit before moving with the belt, leaving a black mark on the belt (figure). How long is that mark (in m) if the coefficient of kinetic friction between the carbon block and the belt is 0.20 and the coefficient of static friction is 0.30?
357 docs148 tests

357 docs148 tests
