No. of questions - 40
Time - 30 min
1.
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?
2.
Energy of photon of visible light is
3.
Zeeman effect refers to the
5.
Quantum theory was postulated by:
6.
X-rays do not show the phenomenon 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:
9.
Which is not deflected by magnetic field:
10.
The characteristic not associated with Planck’s theory is
11.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
12.
Particle nature of electron was experimentally demonstrated by
13.
No two electrons can have the same values of …. quantum numbers.
15.
A quanta will have more energy, if :
17.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
18.
Wave nature of electrons was demonstrated by
19.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
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?
22.
Photoelectric effect was discovered by :
23.
What is the ration of mass of an electron to the mass of a proton?
24.
Potassium ion is isoelectronic with the atom of:
25.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
26.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
28.
Increase in the frequency of the incident radiations increases the:
29.
The nature of canal rays depends on:
30.
Positive rays or canal rays are:
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 number of vacant orbitals of element with atomic number 14 is:
33.
The electron possesses wave properties was shown experimentally by:
34.
Bohr′s model violates the rules of classical physics because it assumes that:
35.
Cathode-ray tube is used in:
36.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
37.
As electron moves away from the nucleus, its KE:
38.
The nucleus of an atom contains
39.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
40.
When light is directed at the metal surface, the emitted electrons:
