MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions for Physics

A donor impurity results in ______.

A horizontal spring executes S.H.M. with amplitude 'A₁', when mass 'm₁' is attached to it, When it passes through mean position another mass 'm₂' is placed on it. Both masses move together with amplitude 'A₂'. Therefore A₂ : A₁ is ______ 

A mass M attached to a horizontal spring executes S.H.M. of amplitude A₁. When the mass M passes through its mean position, then a smaller mass m is placed over it and both of them move together with amplitude A₂. The ratio of `(A_1/A_2)` is ______ 

An electron accelerated through potential difference 'V' passes through a uniform transverse magnetic field and experiences a force 'F'. If the accelerating potential in increased to '2V', the electron in the same magnetic field will experience a force ____________.

In Melde's experiment, when the wire is stretched by an empty pan, four loops are obtained and when a six-gram weight is added to the pan, the number of loops becomes one. The mass of pan is ______

The correct statement about stationary waves is that ______

The area of a coil is 'A'. The coil is placed in a magnetic field which changes from 'B₀' to 4B₀' in time 't'. The magnitude of induced e.m.f. in the coil will be ____________.

In a stationary wave all particles ______ 

For a photocell, work function is 'W₀' and stopping potential is 'v'. The wavelength of the incident radiation is (h =Planck's constant, C = velocity of light, e = charge of electron) ____________.

Magnetic force on a closed current-carrying circuit placed in a uniform magnetic field is ______.

Out of the following statements which one is correct?

Semiconductors formed by doping germanium (Ge) with aluminium (Z = 13) and antimony (Z = 51) are ______.

Consider a light ray travelling in air is incident into a medium of refractive index `sqrt(2"n")`. The incident angle is twice that of refracting angle. Then, the angle of incidence will be ______.

The refracting angle of a prism is A and refractive index of the material of the prism is cot (A/2). Then the angle of minimum deviation will be ______.

What will be the effect on the root mean square velocity of oxygen molecules if the temperature is doubled and the oxygen molecule dissociates into atomic oxygen?

A parallel beam of light of wavelength 900 nm and intensity 100 wm^-2 is incident on a surface perpendicular to the beam. The number of photons crossing 1 cm² area perpendicular to the beam in one second is ______

Which is the correct ascending order of wavelengths?

Two trains are moving towards each other with speeds of 20m/s and 15 m/s relative to the ground. The first train sounds a whistle of frequency 600 Hz. The frequency of the whistle heard by a passenger in the second train before the train meets, is ______. (the speed of sound in air is 340 m/s) 

A ray of light is incident normally on a glass slab of thickness 5 cm and refractive index 1.6. The time taken to travel by a from source of slab is same as to travel through glass slab. The distance of source from the surface is ______.

A string is vibrating in its fifth overtone between two rigid supports 2.4 m apart. The distance between successive node and antinode is ______.