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

In a potentiometer experiment, when the galvanometer shows no deflection, then no current flows through ____________.

Photoelectrons emitted from a metallic surface are initially ____________.

The potentiometer is more sensitive, when ______.

In Bohr's model of hydrogen atom, the period of revolution of the electron in any orbit is proportional to ______.

In the n^th orbit, the energy of an electron `"E"_"n"= -13.6/"n"^2"eV"` for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be ____________.

In photoelectric experiment, if both the intensity and frequency of the incident light are doubled, then the saturation of photoelectric current ______.

The readings of ammeter and voltmeter in the following circuit are respectively

When hydrogen atom is in its first excited level, its radius is how many time its ground state radius?

A conducting square loop of side l and resistance R moves in its plane with a uniform velocity v perpendicular to one of its side. A magnetic induction B constant in time and space, pointing perpendicular and into the plane of the loop exists everywhere. The current induced in the loop is ______.

The inductive reactance of a coil is 1500 n. If its inductance and the frequency of A.C. supply are both doubled, then the reactance will become ______.

A body performing a simple harmonic motion has potential energy 'P₁' at displacement 'x₁' Its potential energy is 'P₂' at displacement 'x₂'. The potential energy 'P' at displacement (x₁ + x₂) is ________.

An important spectral emission line has a wavelength of 21 cm. The corresponding photon energy is (h = 6.62 x 10^-34 Js, c = 3 x 10⁸ m/s) ____________.

The relation between time and displacement for two particles is given by Y₁ = 0.06 sin 27`pi` (0.04t + `phi_1`), y2 = 0.03sin 27`pi`(0.04t +  `phi_2`). The ratio of the intensity of the waves produced by the vibrations of the two particles will be ______.

The resistivity of potentiometer wire is 40 × 10^-8 ohm - metre and its area of cross-section is 8 × 10^-6 m². If 0.2 ampere current is flowing through the wire, the potential gradient of the wire is ______.

According to Bohr's theory, the expression for the kinetic and potential energy of an electron revolving in an orbit is given respectively by ______.

A potentiometer is an ideal device for measuring potential difference because ______.

Two samples A and B, of a gas at the same initial temperature and pressure are compressed from volume V to V/2; A isothermally and B adiabatically. The final pressure of A will be ______.

Let n_h and n_e be the number of holes and conduction electrons respectively in a semiconductor. Then ______.

Light of wavelength `lambda` strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2E, the wavelength must be changed to `lambda'` where ____________.

Which one of the following curves represents the variation of impedance (Z) with frequency f in series LCR circuit?