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

If n is principal quantum number and r is the radius of the orbit in which electron revolves around nucleus, then its kinetic energy is ____________.

In the given figure, battery E is balanced on 55 cm length of potentiometer wire but when a resistance of 10 `Omega` is connected in parallel with the battery, then it balances on 50 cm length of the potentiometer wire. The internal resistance r of the battery is ____________.

In a semiconductor, the number of holes and number of free electrons are represented as 'n_h' and 'n_e' respectively. Which one of the following statements is TRUE for the semiconductor?

A potentiometer wire of length 100 cm and resistance 3 `Omega` is connected in series with resistance of 8 `Omega` and an accumulator of 4 volt whose internal resistance is 1 `Omega`.

The displacement of a particle is 'y' = 2 sin `[(pit)/2 + phi]`, where 'y' is cm and 't' in second. What is the maximum acceleration of the particle executing simple harmonic motion? 

(Φ = phase difference)

The maximum speed of a particle in S.H.M. is 'V'. The average speed is ______ 

The length of the second's pendulum is decreased by 0.3 cm when it is shifted from place A to place B. If the acceleration due to gravity at place A is 981 cm/s², the acceleration due to gravity at place B is ______ (Take π² = 10)

There are three needles 'N₁', 'N₂' and 'N₃' made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. When a magnet is brought close to them, then it will ____________.

The materials having negative magnetic susceptibility are ____________.

The magnetic property of magnetic substance is associated with ____________.

The product of magnetic susceptibility (`chi`) and absolute temperature (T) is constant for a ____________.

Above the curie temperature the susceptibility of ferromagnetic substance varies ____________.

A sphere of gold when brought towards a powerful magnet experiences ____________.

In an a.c. circuit containing L, C, R is series, the ratio of true power to apparent power is (Z = impedance of the circuit, R = resistance, `phi` = phase difference between the r.m.s. values of current and e.m.f.) ____________.

An alternating current of frequency 50 Hz has the peak value as 14.14 A. The time taken by the alternating current in reaching from zero to maximum value and r.m.s. value of current will be respectively ____________.

In LCR circuit the inductance is changed from L to 9L. For same resonant frequency the capacitance should be changed from C to ____________.

Let the inductance and resistance be denoted by 'L' and 'R' respectively. The dimensions of `("L"/"R")` are ____________.

The radiations of energies 1 eV and 2.5 eV are incident on a metal surface having work function 0.5 eV. The ratio of the maximum velocities of the emitted photo-electrons is ____________.

A light of wavelength '`lambda`' and intensity 'I' falls on photosensitive material. If 'N' photoelectrons are emitted, each with kinetic energy E, then ____________.

When a certain metallic surface is illuminated with monochromatic light of wavelength '`lambda`', the stopping potential for photoelectric effect is '3V₀'. If the same surface is illuminated with a light of wavelength '`2 lambda`', the stopping potential is found as 'V₀'. The threshold wavelength for this surface is ____________.