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

A wire of length 50 cm moves with a velocity of 300 m/min, perpendicular to a magnetic field. If the e.m.f. induced in the wire is 2 V, the magnitude of the field in tesla is ______.

Two identical thin metal plates has charge q₁ and q₂ respectively such that q₁ > q₂. The plates were brought close to each other to form a parallel plate capacitor of capacitance C. The potential difference between them is ______.

The momentum of an electron revolving in n^th orbit is given by ______.

Two cells of same emf but different internal resistances r₁ and r₂ are connected in series with a resistance R. The value of resistance R, for which the potential difference across second cell is zero, is ______.

If you are provided a set of resistances 2Ω, 4Ω, 6Ω and 8Ω. Connect these resistances so as to obtain an equivalent resistance of `46/3`Ω.

In an experiment, 200 V A.C. is applied at the ends of an LCR circuit. The circuit consists of an inductive reactance (X_L) = 50 Ω, capacitive reactance (X_C) = 50 Ω and ohmic resistance (R) = 10 Ω. The impedance of the circuit is ______.

For a given photosensitive material and frequency (> threshold frequency) of incident radiation, the photoelectric current varies with the intensity of incident light as:

A cell of internal resistance r is connected across an external resistance nr. Then the ratio of the terminal voltage to the emf of the cell is ______.

A pure semiconductor has equal electron and hole concentration of 10¹⁶ m^-3. Doping by indium increases nh to 5 × 10²² m^-3. Then, the value of n_e in the doped semiconductor is ______.

A long straight wire in the horizontal plane carries a current of 75 A in north of south direction, magnitude and direction of field B at a point 3 m east of the wire is ______.

A transverse wave is represented by y = A sin (ωt - kx). For what value of the wavelength is the wave velocity equal to the maximum particle velocity?

Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is ______.

An electron of mass m and charge e initially at rest gets accelerated by a constant electric field E. The rate of change of de-Broglie wavelength of this electron at time t ignoring relativistic effects is ______.

If `vec"A"=3hat"i"-2hat"j"+hat"k",vec"B"=hat"i"-3hat"j"+5hat"k" and vec"C"=2hat"i"+hat"j"-4hat"k"` form a right angled triangle then out of the following which one is satisfied?

Magnetic susceptibility for a paramagnetic and diamagnetic materials is respectively ______.

A bomb at rest explodes into 3 parts of the same mass. The momentum of the two parts is `-3"P"hat"i"` and `2"P"hat"J"` respectively. The magnitude of the momentum of the third part is ______.

In a photocell, frequency of incident radiation is increased by keeping other factors constant (v > v₀), the stopping potential ______.

If the electron in hydrogen atom jumps from second Bohr orbit to ground state and difference between energies of the two states is radiated in the form of photons. If the work function of the material is 4.2 eV, then stopping potential is ______.

[Energy of electron in nth orbit = `-13.6/"n"^2` eV ]

A particle is performing SHM starting extreme position, graphical representation shows that between displacement and acceleration there is a phase difference of ______.

On a photosensitive material when frequency of incident radiation is increased by 30%, kinetic energy of emitted photoelectrons increases from 0.4 eV. The work function of the surface is ______.