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

When the electron in hydrogen atom jumps from fourth Bohr orbit to second Bohr orbit, one gets the ______.

In U.C.M., when time interval δt → 0, the angle between change in velocity (δv) and linear velocity (v) will be ______.

For a certain atom when the system moves from 2E level to E, a photon of wavelength `lambda` is emitted. The wavelength of photon produced during its transition from `(4"E")/3` level to E is ____________.

The work function of a metal is 1.6 x 10^-19 J. When the metal surface is illuminated by the light of wavelength 6400 Å, then the maximum kinetic energy of emitted photo-electrons will be (Planck's constant h = 6.4 x 10^-34 Js) ____________.

If in an A.C., L.C series circuit X_C> X _L. Hence potential ______.

A wheel of M.I. 50 kg m² starts rotating on applying a constant torque of 200 Nm. Its angular velocity after 2.5 second from the start is ______.

In a thermodynamic system, working substance is ideal gas. Its internal energy is in the form of ______.

The reactance of a capacitor in an A.C. circuit is 20 Ω. If the frequency of A.C. is doubled, its reactance will become ______.

How many moles of electrons are required for reduction of 9 moles of Cr³⁺ to Cr?

If the ionisation potential of helium atom is 24.6 volt, the energy required to ionise it will be ____________.

Which of the following represents the variation of inductive reactance (X_L) with the frequency of voltage source (t)?

The work function of a metallic surface is 5.01 eV. The photoelectrons are emitted when light of wavelength 2000 Å falls on it. The potential difference applied to stop the fastest photoelectrons is [h = 4.14 x 10^-15 eV sec] ____________.

Taking the Bohr radius as a₀= 53 pm, the radius of Li⁺⁺ ion in its ground state, on the basis of Bohr's model, will be about ______.

For which one of the following, Bohr model is not valid?

8 m³ of a gas is heated at the pressure 10⁵ N/m² until its volume increases by 10%. Then, the external work done by the gas is ____________.

A cycle wheel of radius 0.6 m is rotated with constant angular velocity of 15 rad/s in a region of magnetic field of 0.2 T which is perpendicular to the plane of the wheel. The e.m.f generated between its center and the rim is, ____________.

The resistance of the potentiometer wire should ideally be ____________.

When 1 g of water at 0° C and 1 x 10⁵ N/m² pressure is converted into ice of volume 1.082 cm³, the external work done will be ____________.

What is the de Broglie wavelength of an electron of energy 180 eV?

(Mass of electron = 9 x 10^-31 kg and Planck's constant = 6.6 x 10^-34 Js.)

A particle is moving along a circular path of radius 6 m with a uniform speed of 8 m/s. The average acceleration when the particle completes one-half of the revolution is ______.