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

Which one of the following is TRUE in photoelectric emission?

The following graph shows the stopping potential V₀ versus frequency v for photoelectric emission from two metals A and B. The slope of each of the lines gives ______

If the distance between the sun and the earth is made three times, then attraction between the two will ______

A charged particle is moving in a uniform magnetic field in a circular path of radius R. When the energy of the particle becomes three times the original, the new radius will be ______.

When a photon enters glass from air, which one of the following quantity does not change?

A ray of light is incident at an angle ion one face of prism of small angle A and emerges normally from the other surface. µ is the refractive index of the material of the prism. The angle of incidence is _____________.

Lenz's law obeys the principle of ______ conservation.

Alternating current cannot be measured by D.C. ammeter because ____________.

The graph of stopping potential `"V"_"s"` against frequency v of incident radiation is plotted for two different metals P and Q as shown in the graph. Φ_P and Φ_Q are work-functions of P and Q respectively, then

When light falls on a metal surface, the maximum kinetic energy of the emitted photoelectrons depends upon ______

If the maximum kinetic energy of emitted electrons in photoelectric effect is 3.2 × 10^-19 J and the work-function for metal is 6.63 × 10^-19 J, then stopping potential and threshold wavelength respectively are
[Planck's constant, h = 6.63 × 10³⁴ J-s]
[Velocity of light, c = 3 × 10⁸ `"m"/"s"`]
[Charge on electron= 1.6 × 10^-19 C]

An alternating voltage e = `200sqrt2` sin(100 t) volt is connected to a 1 µF capacitor through a.c. ammeter. The reading of the ammeter is ______

Two waves represented by the following equations are travelling in the same medium 

`y_1 = 5 sin 2pi(75t - 0.25 x)`

`y_2 = 10 sin 2pi(150t - 0.50 x)`

The intensity ratio `"I"_1/"I"_2` of the two waves is ______

An AC circuit contains resistance of 12Q and inductive reactance 5Q. The phase angle between current and potential difference will be ______.

The temperature of an ideal gas, initially at 27°C, is raised by 12°C. The rms velocity of the gas molecules will, ______ 

The Gyromagnetic ratio of the electron revolving in a circular orbit of a hydrogen atom is 8.8 x 10¹⁰ C kg^-1. What is the mass of the electron? (Given charge of the electron = 1.6 x 10-19 C.) 

The angle made by orbital angular momentum of electron with the direction of the orbital magnetic moment is ______.

In a certain region of space with volume 0.2 m³ , the electric potential is found to be 5V throughout. The magnitude of electric field in this region is: ____________.

Dimensions of Gyromagnetic ratio are _________.

The maximum velocity of the photoelectron emitted by the metal surface is 'v '. Charge and mass of the photoelectron is denoted by 'e' and 'm' respectively. The stopping potential in volt is ______.