No. of questions - 40
Time - 30 min
1.
Particle nature of electron was experimentally demonstrated by
2.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
3.
Wave nature of electrons was demonstrated by
4.
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?
5.
As electron moves away from the nucleus, its KE:
6.
Quantum theory was postulated by:
7.
Potassium ion is isoelectronic with the atom of:
9.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
10.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
11.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
13.
Bohr′s model violates the rules of classical physics because it assumes that:
14.
Increase in the frequency of the incident radiations increases the:
16.
The number of vacant orbitals of element with atomic number 14 is:
17.
A quanta will have more energy, if :
18.
The nature of canal rays depends on:
19.
When light is directed at the metal surface, the emitted electrons:
20.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
21.
The characteristic not associated with Planck’s theory is
22.
No two electrons can have the same values of …. quantum numbers.
23.
Energy of photon of visible light is
25.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
26.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
27.
The nucleus of an atom contains
28.
X-rays do not show the phenomenon of :
29.
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
30.
Cathode-ray tube is used in:
31.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
32.
The electron possesses wave properties was shown experimentally by:
33.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
34.
Photoelectric effect was discovered by :
35.
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?
36.
Which is not deflected by magnetic field:
37.
Positive rays or canal rays are:
39.
Zeeman effect refers to the
40.
What is the ration of mass of an electron to the mass of a proton?
