In YDSE, d = 
, then the total no. of maxima observed upon screen will be
Young's double slit experiment is carried out by using green, red and blue light, one color at a time. The fringe widths recorded are
, respectively. Then,
In the Young's double slit experiment using a monochromatic light of wavelength 
, the path difference (in terms of an integer n) corresponding to any point having half the peak intensity is
If the amplitude ratio of two sources producing interference is 3 : 5, the ratio of intensities of maxima and minima is
For destructive interference to take place between two monochromatic light waves of wavelength 
, the path difference should be
Two identical light waves, propagating in the same direction, have a phase difference 
. After they superpose, the intensity of the resulting wave will be proportional to
Two coherent monochromatic light beams of intensites I and 4I are superimposed. The maximum and minimum possible intensities in the resulting beam are
The above is a plot of binding energy per nucleon Eb, against the nuclear mass M; A, B, C, D, E, F correspond to different nuclei. Consider four reactions:
where ε is the energy released? In which reactions is ε positive?
A piece of wire is bent in the shape of a parabola y = kx2 (y-axis vertical) with a bead of mass m on it. The bead can slide on the wire without friction. It stays at the lowest point of the parabola when the wire is at rest. The wire The wire is now accelerated parallel to the x-axis with a constant acceleration a. The distance of the new equilibrium position of the bead, where the bead can stay at rest w.r.t. the wire, from the y-axis is
What is the angle of friction between two surfaces in contact, if coefficient of friction is 
A force of 49 N is just able to move a block of wood weighing 10 kg on a rough horizontal surface, then coefficient of friction is
A block of mass 2 kg rests on an inclined plane of inclination angle 37o, then calculate the force of friction acting on the block [take g = 10 m/s2]
A particle of mass m is moving on a circular path of radius r with uniform speed v, rate of change of linear momentum is
A circular track of radius 600 m is to be designed for vehicles passing at an average speed of 54 km/hr. The required angle of banking is :
A block of mass 2 kg rests on the floor of an elevator, which is moving down with an acceleration ‘g’, then the apparent weight of the block is [take g = 10 m/s2]20
When a lift is moving upward with acceleration of 5 m/s2 then percentage change in the weight of the person in the lift is x%. If the lift is moving down with acceleration 5 m/s2 then percentage change in the weight of
same person is y%. Then the ratio x/y is (g = 10 m/s2)
A block is placed on a smooth inclined plane as shown. For what value of horizontal force F, the block will remain at rest?
Which of the following ion has the maximum magnetic moment?
The radius of 5th Bohr orbit in hydrogen atom is
Which of the following has the same number of s-electrons as the d-electrons in Fe2+?
Which of the following equation was suggested by de Broglie?
The momentum of a particle which has a de Broglie wavelength of 0.1 nm is (h = 6.6 × 10^-34 Js)
The total number of orbitals in a shell with principal quantum number n is
How many 3d electrons can have spin quantum number -1/2 ?
Which of the following represent(s) the correct set of four quantum numbers of a 4d electron?
The electron identified by quantum numbers n and /
(i) n=4,/=1 (ii) n=4,/=0, (iii) n= 3,/=0 (v) n=3,/= 1
Can be placed in order of increasing energy
The correct set of quantum numbers for the unpaired electron of chlorine atom is
The total number of electrons in a 4d subshell are
Which set of quantum numbers is not consistent with theory?
In the emission line spectra of hydrogen atom, how many lines can be accounted for all possible electronic transitions from 5th energy level within the atom?
The potential energy of an electron in hydrogen atom is -3.02 eV, its kinetic energy will be
The maximum number of electrons possible in subshell is equal to
How many electrons with / = 2 are there in an atom having atomic number 54?
Out of X-rays, infrared rays, visible rays and microwaves, the largest frequency is of
If 250J of work is done in sliding a5 kg block up an inclined plane of height 4 m. Work done against friction is (g = 10 ms–2)
KE acquired by a mass m in travelling a certain distance d, starting from rest, under the action of a constant force F is
The power of water pump is 4 kW. If g = 10 ms–2, the amount of water it can raise in 1 minute to a height of 20 m is
A U–238 nucleus originally at rest, decays by emitting an alpha-particle, say with a velocity of v m/s. The recoil velocity (in ms–1) of the residual nucleus is
A bullet weighing 10 g and moving with a velocity 800 ms–1 strikes a 10 kg block resting on a frictionless surface. The speed of the block after the perfectly inelastic collision is approximately
When momentum of a body increases by 200%, its KE increases by
A drop of mass 2.0 g falls from a cliff of height 1.0 km. It hits the ground with a speed of 50.0 ms–1. The work done by the resistive force is
Two bodies of masses m1 and m2 have same kinetic energy. The ratio of their momentum is
Under the action of a force, a 1 kg body moves, such that its position x as a function of time t is given by x= t*t*t / 2,where x is in meter and t is in second.The work done by the force in first 3 second is
A string is used to pull a block of mass m vertically up by a distance h at a constant acceleration 3 . The work done by the tension in the string is
In a full wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be
In a common base amplifier, the phase difference between the input signal voltage and output voltage is
The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm is incident on it. The band gap in (eV) for the semiconductor is
The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm is incident on it. The band gap in (eV) for the semiconductor is
When p-n junction diode is forward biased, then
The manifestation of band structure in solids is due to