No. of questions - 40
Time - 30 min
2.
What is the ration of mass of an electron to the mass of a proton?
3.
Bohr′s model violates the rules of classical physics because it assumes that:
4.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
5.
X-rays do not show the phenomenon of :
6.
Potassium ion is isoelectronic with the atom of:
7.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
8.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
10.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
11.
The nucleus of an atom contains
12.
When light is directed at the metal surface, the emitted electrons:
13.
The number of vacant orbitals of element with atomic number 14 is:
14.
The nature of canal rays depends on:
15.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
16.
The characteristic not associated with Planck’s theory is
17.
Zeeman effect refers to the
19.
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?
20.
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?
21.
Particle nature of electron was experimentally demonstrated by
22.
The electron possesses wave properties was shown experimentally by:
25.
Energy of photon of visible light is
26.
Which is not deflected by magnetic field:
27.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
28.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
29.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
30.
Photoelectric effect was discovered by :
31.
Cathode-ray tube is used in:
32.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
33.
As electron moves away from the nucleus, its KE:
34.
No two electrons can have the same values of …. quantum numbers.
35.
Increase in the frequency of the incident radiations increases the:
36.
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
37.
Quantum theory was postulated by:
38.
Positive rays or canal rays are:
39.
A quanta will have more energy, if :
40.
Wave nature of electrons was demonstrated by
