No. of questions - 40
Time - 30 min
1.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
2.
The number of vacant orbitals of element with atomic number 14 is:
3.
Particle nature of electron was experimentally demonstrated by
4.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
5.
As electron moves away from the nucleus, its KE:
6.
What is the ration of mass of an electron to the mass of a proton?
7.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
8.
An electron jumps from an outer orbit to an inner orbit with an energy difference of 3.0eV. What will be the wavelength of the line emitted?
9.
Increase in the frequency of the incident radiations increases the:
11.
A quanta will have more energy, if :
12.
Bohr′s model violates the rules of classical physics because it assumes that:
13.
Zeeman effect refers to the
14.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
15.
The characteristic not associated with Planck’s theory is
16.
Which is not deflected by magnetic field:
17.
Positive rays or canal rays are:
18.
Quantum theory was postulated by:
19.
No two electrons can have the same values of …. quantum numbers.
21.
The electron possesses wave properties was shown experimentally by:
23.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
24.
In Bohr’s series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inner-orbit jumps of the electron for Bohr orbit in an atom of hydrogen?
25.
Photoelectric effect was discovered by :
28.
Cathode-ray tube is used in:
29.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
30.
When light is directed at the metal surface, the emitted electrons:
31.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
32.
The nature of canal rays depends on:
33.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
34.
Wave nature of electrons was demonstrated by
35.
Energy of photon of visible light is
36.
X-rays do not show the phenomenon of :
37.
Potassium ion is isoelectronic with the atom of:
38.
A gas absorbs photon of 355 nm and emits at two wavelengths. If one of the emission is at 680 nm, the other is at
39.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
40.
The nucleus of an atom contains
