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

When an electron in hydrogen atom is excited from its 3^rd to 5^th stationary orbit, tbe change in angular momentum of electron is (Planck's constant: h = 6.62 x 10-³⁴ Js) ____________.

The polarizing angle for a transparent medium is 'θ' and 'V' is the speed of light in that medium, then relation between 'θ' and 'V' is (c = velocity of light).

Choose the CORRECT statement from the following.

Brewster's angle for a transparent medium is ______.

When a beam of unpolarised monochromatic light is incident on a plane glass plate at a polarizing angle, then which one of the following statements is correct?

In hydrogen spectnun, the wavelengths of light emited in a series of spectral lines is given by the equation `1/lambda = "R"(1/3^2 - 1/"n"^2)`, where n = 4, 5, 6 .... And 'R' is Rydberg's constant.
Identify the series and wavelenth region.

Angular speed of an electron in the ground state of hydrogen atom is 4 × 10¹⁶ rad/s. What is its angular speed in 4^th orbit?

Ratio of centripetal acceleration for an electron revolving in 3^rd orbit to 5^th orbit of hydrogen atom is ______.

A hot body at a temperature 'T' is kept in a surrounding of temperature 'T₀'. It takes time 't₁' to cool from 'T' to 'T₂', time t₂ to cool from 'T₂' to 'T₃' and time 't₃' to cool from 'T₃' to 'T₄'. If (T - T₂) = (T₂ - T₃) = (T₃ - T₄), then ______.

An electron of mass 'm' is rotating in first Bohr orbit of radius 'r' in hydrogen atom. The orbital acceleration of the electron in first orbit (h = Planck's constant).

In Bohr model, speed of electron in nth orbit of hydrogen atom is ______. (b = Planck's constant, n = principal quantum number, ∈₀ is the permittivity of free space, e = electronic charge)

An A.C. generator produced an output voltage e = 170 sin 327t volt, where t is in seconds. The frequency of A.C. voltage is nearly ____________.

The minimum energy required to excite a hydrogen atom from its ground state is ____________.

In Bohr's model of hydrogen atom, which of the following pairs of quantities are quantized?

Assuming the expression for the pressure exerted by the gas on the wall of the container, it can be shown that pressure is ______.

If a charge on the body is 1 nC, then how many electrons are present on the body?

A molecule consists of two atoms each of mass 'm' and separated by a distance 'd'. At room temperature the average rotational kinetic energy is 'E', then its angular frequency is ______.

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 ____________.

A metal rod of cross-sectional area 3 × 10^-6 m² is suspended vertically from one end has a length 0.4 m at 100°C. Now the rod is cooled upto 0°C, but prevented from contracting by attaching a mass 'm' at the lower end. The value of 'm' is ______.

(Y = 10¹¹ N/m², coefficient of linear expansion = 10^-5/K, g = 10m/s²)

A metal rod of length Land cross-sectional area A is heated through T °C. What is the force required to prevent the expansion of the rod lengthwise?

(Y = Young's modulus of material of the rod, α = coefficient of linear expansion of the rod.)

The average translational kinetic energy of a molecule in a gas is 'E₁'. The kinetic energy of the electron (e) accelerated from rest through p.d. 'V' volt is 'E₂'. The temperature at which E₁ = E₂ is possible, is ______.