No. of questions - 40
Time - 30 min
2.
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?
3.
The characteristic not associated with Planck’s theory is
4.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
5.
When light is directed at the metal surface, the emitted electrons:
6.
Zeeman effect refers to the
7.
Cathode-ray tube is used in:
8.
Quantum theory was postulated by:
10.
X-rays do not show the phenomenon of :
11.
Increase in the frequency of the incident radiations increases the:
12.
Particle nature of electron was experimentally demonstrated by
13.
Potassium ion is isoelectronic with the atom of:
14.
Energy of photon of visible light is
15.
The number of vacant orbitals of element with atomic number 14 is:
17.
Positive rays or canal rays are:
18.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
19.
Photoelectric effect was discovered by :
20.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
21.
A quanta will have more energy, if :
22.
Wave nature of electrons was demonstrated by
23.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
24.
What is the ration of mass of an electron to the mass of a proton?
25.
Bohr′s model violates the rules of classical physics because it assumes that:
26.
The nucleus of an atom contains
27.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
28.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
30.
Which is not deflected by magnetic field:
31.
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
32.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
33.
As electron moves away from the nucleus, its KE:
34.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
36.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
37.
The electron possesses wave properties was shown experimentally by:
38.
No two electrons can have the same values of …. quantum numbers.
39.
The nature of canal rays depends on:
40.
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?
