CUET (UG) entrance exam Question Bank Solutions

An alpha particle has

In 88 Ra²²⁶ nucleus, there are

Nucleolus of an atom of mass No. 24 and charge no. 11 consists of

The ratio of minimum to max^m wavelength in ballmer series is:-

A parallel beam of light ray parallel to the x-axis is incident on a parabolic reflecting surface x = 2by² as shown in the figure. After reflecting it passes through focal point F. What is the focal length of the reflecting surface?

On the basis of Bohr's model, the approximate radius of Li⁺⁺ ion in its ground state ifthe Bohr radius is a₀ = 53 pm : 

A TV tower has a height of 100 meter. If the coverage range is to be made three times then the height of the tower should be increased by.

Of the diodes shown in the following diagrams, which one is reverse biased?

The current through an ideal PN-junction shown in the following circuit diagram will be:

According to the Bohr theory of H-atom, the speed of the electron, its energy and the radius of its orbit varies with the principal quantum number n, respectively, as:

The area of the region covered by the TV broadcast by a TV tower of 100 m height is (Radius of the earth = 6.4 × 10⁶ m):

The drift current in a p-n junction is from the ______.

The intensity of a point source of light, S, placed at a distance d in front of a screen A, is I₀ at the center of the screen. Find the light intensity at the center of the screen if a completely reflecting plane mirror M is placed at a distance d behind the source, as shown in the figure.

If the resistivity of an alloy is P and that of constitute metal is P₁ then

In form of Rydberg's constant R, the wave no of this first Ballmer line is

The wavelength of the first time line of Ballmer series is 6563 A°. The Rydberg constant for hydrogen is about:-

The angular momentum of electron in n^th orbit is given by

The energy of an electron in h^th orbit of hydrogen atom is –13.6/n²ev energy required to excite the electron from the first orbit to the third orbit is

According to Bhor' s theory the moment of momentum of an electron revolving in second orbit of hydrogen atom will be.

A – pn junction has a depletion layer of thickness .of the order of